LT3048 Series
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, EN/UVLO = 3V, unless otherwise noted. Parameter applies to all options unless specified.
PARAMETER |
CONDITIONS |
|
MIN |
TYP |
MAX |
UNITS |
|
|
|
|
|
|
|
VIN Operating Range |
|
|
2.7 |
|
4.8 |
V |
Boost Regulator |
|
|
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|
|
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|
|
BSTOUT-LDOOUT Regulation Voltage |
|
l |
1 |
1.1 |
1.2 |
V |
|
|
|
|
|
|
|
BSTOUT-VIN Regulation Voltage |
LDOOUT < VIN |
|
|
1.1 |
|
V |
VIN Quiescent Current |
Not Switching |
|
|
475 |
600 |
µA |
|
EN ≤ 0.4V |
|
|
0.1 |
1 |
µA |
Switching Frequency |
LT3048 |
|
0.75 |
1.00 |
1.25 |
MHz |
|
|
l |
0.7 |
1.00 |
1.30 |
MHz |
|
LT3048-XX |
|
1.7 |
2.2 |
2.7 |
MHz |
|
|
l |
1.6 |
2.2 |
2.8 |
MHz |
Maximum Duty Cycle |
LT3048 |
|
93 |
95 |
|
% |
|
LT3048-XX |
|
86 |
90 |
|
% |
Switch Current Limit |
(Note 3) |
|
300 |
400 |
500 |
mA |
|
|
|
|
|
|
|
Switch VCESAT |
ISW = 200mA |
|
|
220 |
|
mV |
Diode Forward Drop |
IDIODE = 100mA |
|
|
0.84 |
|
V |
EN Voltage High |
|
|
1.25 |
|
|
V |
|
|
|
|
|
|
|
EN Voltage Low |
|
|
|
|
0.4 |
V |
|
|
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|
|
|
|
LDO Linear Regulator |
|
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|
|
LDO Quiescent Current |
LT3048: Supplied by LDOIN |
|
|
14 |
20 |
µA |
|
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|
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|
|
|
|
LT3048-XX: Supplied by BSTOUT |
|
|
14 |
20 |
µA |
|
|
|
|
|
|
|
FB Pin Current |
|
|
|
60 |
|
nA |
|
|
|
|
|
|
|
FB Regulation Voltage |
LT3048: ILOAD = 100µA, FB = LDOOUT |
|
1.216 |
1.235 |
1.254 |
V |
|
LT3048: 100µA ≤ ILOAD ≤ 40mA |
l |
1.210 |
1.235 |
1.260 |
V |
|
|
|||||
FB Load Regulation |
LT3048: ∆ILOAD = 100µA to 40mA |
|
|
2 |
6 |
mV |
LDOOUT Regulation Voltage |
LT3048-15: ILOAD = 100µA |
|
14.775 |
15.00 |
15.225 |
V |
|
LT3048-15: 100µA ≤ ILOAD ≤ 40mA |
l |
14.625 |
15.00 |
15.375 |
V |
|
|
|||||
|
LT3048-12: ILOAD = 100µA |
|
11.82 |
12.00 |
12.18 |
V |
|
LT3048-12: 100µA ≤ ILOAD ≤ 40mA |
l |
11.70 |
12.00 |
12.30 |
V |
|
|
|||||
|
LT3048-5: ILOAD = 100µA |
|
4.925 |
5.00 |
5.075 |
V |
|
LT3048-5: 100µA ≤ ILOAD ≤ 40mA |
l |
4.875 |
5.00 |
5.125 |
V |
|
|
|||||
|
LT3048-3.3: ILOAD = 100µA |
|
3.250 |
3.300 |
3.350 |
V |
|
LT3048-3.3: 100µA ≤ ILOAD ≤ 40mA |
l |
3.217 |
3.300 |
3.383 |
V |
|
|
|||||
LDOOUT Load Regulation |
LT3048-15: ∆ILOAD = 100µA to 40mA |
|
|
20 |
45 |
mV |
|
LT3048-12: ∆ILOAD = 100µA to 40mA |
|
|
20 |
45 |
mV |
|
LT3048-5: ∆ILOAD = 100µA to 40mA |
|
|
12 |
25 |
mV |
|
LT3048-3.3: ∆ILOAD = 100µA to 40mA |
|
|
9 |
18 |
mV |
|
|
|
|
|
|
|
For more information www.linear.com/LT3048 |
3048fa |
|
||
|
LT3048 Series
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, EN/UVLO = 3V, unless otherwise noted. Parameter applies to all options unless specified.
PARAMETER |
CONDITIONS |
|
|
MIN |
TYP |
MAX |
UNITS |
|
|
|
|
|
|
|
|
LDOOUT Voltage Noise |
LT3048: CBYP = 0nF, ILOAD |
= 40mA, LDOOUT = 1.235V |
|
|
38 |
|
µVRMS |
BW = 10Hz to 100kHz |
LT3048: CBYP = 1nF, ILOAD |
= 40mA, LDOOUT = 1.235V |
|
|
25 |
|
µVRMS |
COUT = 1µF |
|
|
|
|
|
|
|
LT3048-15: CBYP = 0nF, ILOAD = 24mA |
|
|
250 |
|
µVRMS |
||
|
LT3048-15: CBYP = 1nF, ILOAD = 24mA |
|
|
60 |
|
µVRMS |
|
|
LT3048-12: CBYP = 0nF, ILOAD = 31mA |
|
|
225 |
|
µVRMS |
|
|
LT3048-12: CBYP = 1nF, ILOAD = 31mA |
|
|
60 |
|
µVRMS |
|
|
LT3048-5: CBYP = 0nF, ILOAD = 40mA |
|
|
145 |
|
µVRMS |
|
|
LT3048:-5: CBYP = 1nF, ILOAD = 40mA |
|
|
50 |
|
µVRMS |
|
|
LT3048-3.3: CBYP = 0nF, ILOAD = 40mA |
|
|
120 |
|
µVRMS |
|
|
LT3048-3.3: CBYP = 1nF, ILOAD = 40mA |
|
|
42 |
|
µVRMS |
|
Ripple Rejection |
LT3048: fRIPPLE = 1.0MHz, ILOAD = 40mA |
|
|
60 |
|
dB |
|
|
LT3048: fRIPPLE = 2.2MHz, ILOAD = 40mA |
|
|
53 |
|
dB |
|
Current Limit |
|
|
l |
45 |
80 |
|
mA |
|
|
|
|
|
|
|
|
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The LT3048E is guaranteed to meet performance specifications from 0°C to 125°C junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The
LT3048I is guaranteed over the full –40°C to 125°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C.
Note 3: Current limit guaranteed by design and/or correlation to static test. Slope compensation reduces current limit at higher duty cycle.
|
|
|
3048fa |
|
|
||
|
|
|
|
4 |
For more information www.linear.com/LT3048 |
|
|
|
|
||
|
|||
LT3048 Series
TYPICAL PERFORMANCE CHARACTERISTICS
LT3048 FB Voltage
1.260
|
1.255 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
1.250 |
|
|
|
|
|
|
|
|
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|
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|
|
|
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|
|
(V) |
1.245 |
|
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|
||
1.240 |
|
|
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|
|
|
|
|
|
|
VOLTAGE |
|
|
|
|
|
|
|
|
|
|
1.235 |
|
|
|
|
|
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|
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|
|
FB |
1.230 |
|
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||
1.225 |
|
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1.220 |
|
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1.215 |
|
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|
|
1.210–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
||
|
|
|
|
TEMPERATURE (°C) |
|
|
|
|||
|
|
|
|
|
|
|
|
3048 G01 |
||
LT3048 FB Load Regulation
1.260
1.255
1.250
(V) |
1.245 |
|
|
|
|
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|
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||
1.240 |
|
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|
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|
|
VOLTAGE |
|
|
|
|
|
|
|
|
|
|
|
1.235 |
|
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FB |
1.230 |
|
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||
1.225 |
|
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1.220 |
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1.215 |
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|
1.210 0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
||
|
|
|
|
LOAD CURRENT (mA) |
|
|
|
||||
|
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|
|
3048 G02 |
||
SWITCHING FREQUENCY (MHz)
LT3048 Switching Frequency
1.3
1.2
1.1
1.0
0.9
0.8
0.7–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
TEMPERATURE (°C)
3048 G03
NOISE SPECTRAL DENSITY (nV/√HZ)
LT3048 LDOOUT Noise
1000
100
10 |
|
|
|
|
|
1 |
VIN = 3.6V |
|
|
|
|
|
VOUT = 1.235V |
|
|
|
|
|
L = 5.6 H |
|
|
|
|
0.1 |
CBSTOUT = 4.7 F |
|
|
|
|
CLDOOUT = 1 F |
|
|
|
|
|
|
CBYP = 1nF |
|
|
|
|
0.0110 |
ILOAD = 40mA |
|
|
|
|
100 |
1k |
10k |
100k |
1M |
|
FREQUENCY (Hz)
3048 G04
EFFICIENCY (%)
LT3048-15 Efficiency
80
70 |
|
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60 |
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50 |
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40 |
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30 |
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||||
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|
LDOOUT = 15V |
|
|||||
|
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|||||||
20 |
|
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|
|
L = 10µH |
|
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||
|
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|
|
DCR = 650m |
|
|||||
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|||||||
10 |
|
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|
VIN |
= 2.7V |
|
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|||
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|
VIN |
= 3.3V |
|
||
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|||||
0 |
|
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|
VIN |
= 3.6V |
|
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|
0 |
5 |
10 |
15 |
20 |
25 |
|||||
LOAD CURRENT (mA)
3048 G05
LT3048-15 LDOOUT Load
Regulation
|
15.3 |
|
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(V) |
15.2 |
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||
15.1 |
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VOLTAGE |
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15.0 |
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||
LDOOUT |
14.9 |
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14.8 |
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14.7 0 |
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5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
||||||||||
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LOAD CURRENT (mA) |
|
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||||||||
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3048 G06 |
||
LDOOUT VOLTAGE (V)
LT3048-15 LDOOUT Voltage
15.3
15.2
15.1
15.0 
14.9
14.8
14.7–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
TEMPERATURE (°C)
3048 G07
OUTPUT VOLTAGE DEVIATION (mV)
50
0
–50
–100
–150
–200
–250
–300
LT3048-15 Transient Response
VOUT
ILOAD
VIN = 3.6V |
10µs/DIV |
VOUT = 15V |
|
L = 10µH |
|
CLDOOUT = 1µF CBYP = 1nF
ILOAD = 4mA TO 20mA
|
70 |
|
|
60 |
|
|
50 |
LOAD |
|
|
|
|
40 |
(mA)CURRENT |
|
20 |
|
|
30 |
|
|
10 |
|
3048 G08 |
0 |
|
For more information www.linear.com/LT3048
LT3048-15 LDOOUT Noise
10000 |
|
|
|
|
|
|
|
HZ) |
1000 |
|
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|
|
(nV/√ |
|
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DENSITY |
100 |
|
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|
SPECTRAL |
10 |
|
VIN = 3.6V |
|
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|
VOUT = 15V |
|
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|
L = 10 H |
|
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NOISE |
1 |
|
CBSTOUT = 4.7 F |
|
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|
CBYP = 1nF |
|
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||
|
|
CLDOOUT = 1 F |
|
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|
ILOAD = 24mA |
|
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|
|
0.1 |
10 |
100 |
1k |
10k |
100k |
1M |
|
|
|
FREQUENCY (Hz) |
|
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||
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|
3048 G09 |
3048fa
5
LT3048 Series
TYPICAL PERFORMANCE CHARACTERISTICS
Operating Waveforms: DCM |
Operating Waveforms: CCM |
VSW |
|
|
VSW |
|
|
5V/DIV |
|
|
5V/DIV |
|
|
IL |
|
|
IL |
|
|
100mA/DIV |
|
|
100mA/DIV |
|
|
VIN = 3.6V |
500ns/DIV |
3048 G10 |
VIN = 3.6V |
500ns/DIV |
3048 G11 |
|
|
||||
VOUT = 15V |
|
|
VOUT = 15V |
|
|
L = 2.2µH |
|
|
L = 10µH |
|
|
ILOAD = 15mA |
|
|
ILOAD = 20mA |
|
|
|
|
LT3048-12 LDOOUT |
|
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||||||||
|
|
Load Regulation |
|
|
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|
|
LT3048-12 LDOOUT Voltage |
|
|
||||||||||||||||||||
|
12.3 |
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12.3 |
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||
(V) |
12.2 |
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(V) |
12.2 |
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||||
12.1 |
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12.1 |
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VOLTAGE |
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VOLTAGE |
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12.0 |
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12.0 |
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LDOOUT |
12.9 |
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LDOOUT |
11.9 |
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12.8 |
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11.0 |
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12.7 0 |
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11.7–50 |
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–25 |
0 |
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75 |
100 |
125 |
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LOAD CURRENT (mA) |
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TEMPERATURE (°C) |
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3048 G13 |
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3048 G14 |
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LT3048-12 Efficiency |
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80 |
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70 |
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(%) |
60 |
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50 |
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EFFICIENCY |
30 |
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VOUT = 12V |
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40 |
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20 |
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L = 10µH |
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DCR = 650m |
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10 |
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VIN |
= 2.7V |
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VIN |
= 3.3V |
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0 |
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VIN |
= 3.6V |
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0 |
5 |
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15 |
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30 |
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LOAD CURRENT (mA)
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3048 G12 |
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LT3048-12 LDOOUT Noise |
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10000 |
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HZ) |
1000 |
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(nV/√ |
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DENSITY |
100 |
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SPECTRAL |
10 |
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VIN = 3.6V |
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VOUT = 12V |
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L = 10 H |
= 4.7 F |
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CBSTOUT |
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NOISE |
1 |
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CLDOOUT |
= 1 F |
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CBYP = 1nF |
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ILOAD = 31mA |
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0.1 |
10 |
100 |
1k |
10k |
100k |
1M |
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FREQUENCY (Hz) |
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3048 G15 |
EFFICIENCY (%)
LT3048-5 Efficiency
70
60
50
40
30
VOUT = 5V
20 L = 4.7µH DCR = 350m
10 |
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VIN = 2.7V |
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VIN = 3.3V |
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0 0 |
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VIN = 3.6V |
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5 |
10 |
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40 |
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LOAD CURRENT (mA)
3048 G16
LDOOUT VOLTAGE (V)
LT3048-5 LDOOUT
Load Regulation
5.125
5.100 |
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5.075 |
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5.050 |
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5.025 |
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5.000 |
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4.975 |
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4.950 |
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4.925 |
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4.900 |
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4.875 0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
LOAD CURRENT (mA)
3048 G17
LDOOUT VOLTAGE (V)
LT3048-5 LDOOUT Voltage
5.125
5.100 |
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5.075 |
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5.050 |
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5.025 |
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5.0 |
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4.975 |
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4.950 |
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4.925 |
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4.900 |
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4.875–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
TEMPERATURE (°C)
3048 G18
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3048fa |
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6 |
For more information www.linear.com/LT3048 |
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LT3048 Series
TYPICAL PERFORMANCE CHARACTERISTICS
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LT3048-5 LDOOUT Noise |
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LT3048-3.3 Efficiency |
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10000 |
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60 |
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HZ) |
1000 |
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50 |
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(nV/√ |
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SPECTRALDENSITY |
100 |
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EFFICIENCY(%) |
40 |
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VIN = 3.6V |
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30 |
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10 |
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VOUT = 5V |
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20 |
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VOUT = 3.3V |
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L = 4.7 H |
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L = 3.3µH |
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NOISE |
1 |
CBSTOUT = 2.2 F |
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10 |
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DCR = 285m |
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CBYP = 1nF |
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VININ |
= 3.3V |
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CLDOOUT = 1 F |
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V |
= 2.7V |
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0.110 |
ILOAD = 40mA |
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0 0 |
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VIN = 3.6V |
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100 |
1k |
10k |
100k |
1M |
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5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
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FREQUENCY (Hz) |
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3048 G19 |
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LOAD CURRENT (mA) |
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3048 G20 |
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LDOOUT VOLTAGE (V)
LT3048-3.3 LDOOUT Load Regulation
3.38
3.36 |
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3.34 |
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3.32 |
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3.30 |
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3.28 |
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3.26 |
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3.24 |
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3.22 0 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
LOAD CURRENT (mA)
3048 G21
LDOOUT VOLTAGE (V)
LT3048-3.3 LDOOUT Voltage
3.38
3.36 |
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3.34 |
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3.32 |
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3.30 |
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3.28 |
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3.26 |
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3.24 |
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3.22–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
TEMPERATURE (°C)
3048 G22
LT3048-3.3 LDOOUT Noise
10000 |
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HZ) |
1000 |
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(nV/√ |
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DENSITY |
100 |
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SPECTRAL |
10 |
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VIN = 3.6V |
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VOUT = 3.3V |
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L = 3.3 H |
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NOISE |
1 |
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CBSTOUT = 2.2 F |
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CBYP = 1nF |
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CLDOOUT = 1 F |
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ILOAD = 40mA |
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0.1 |
10 |
100 |
1k |
10k |
100k |
1M |
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FREQUENCY (Hz) |
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3048 G23 |
CURRENT LIMIT (mA)
LDOOUT Current Limit
90
80 |
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70 |
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60 |
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50 |
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40 |
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30 |
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20 |
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10 |
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0–50 |
–25 |
0 |
25 |
50 |
75 |
100 |
125 |
TEMPERATURE (°C)
3048 G24
SWITCH CURRENT LIMIT (mA)
Boost Switch Current Limit
500
450 |
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400 |
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350 |
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300 |
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250 |
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200 |
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150 |
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100 |
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50 |
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0 |
0 |
20 |
40 |
60 |
80 |
100 |
DUTY CYCLE (%)
3048 G25
Boost Switch Current Limit
|
500 |
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450 |
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(mA) |
400 |
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350 |
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LIMIT |
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300 |
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CURRENT |
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250 |
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SWITCH |
200 |
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100 |
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150 |
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50 |
0–50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C)
3048 G26
FREQUENCY (MHz)
LT3048-XX Switching Frequency
2.5
2.0 
1.5
1.0
0.5
0 –50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3048 G27
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|
3048fa |
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For more information www.linear.com/LT3048 |
7 |
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