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19-5709; Rev 0; 12/10
19-5709; Rev 0; 12/10
KIT
EVALUATION	Rail-to-Rail, 200kHz Op Amp
AVAILABLE

	with Shutdown in a Tiny, 6-Bump WLP

General Description

The MAX44265 op amp features a maximized ratio of gain bandwidth (GBW) to supply current and is ideal for battery-powered applications such as handsets, tablets, notebooks, and portable medical equipment. This CMOS op amp features an ultra-low input-bias current of 1pA, rail-to- rail input and output, low supply current of 4µA, and operates from a single 1.8V to 5.5V supply. For additional power conservation, the IC also features a low-power shutdown mode that reduces supply current to 1nA and puts the amplifier’s outputs in a high-impedance state. This device is unity-gain stable with a 200kHz GBW product.

It is available in a space-saving, 0.9mm x 1.3mm, 6-bump WLP package and is specified over the -40°C to +85°C extended operating temperature range.

Features

♦200kHz GBW

♦Ultra-Low 4µA Supply Current

♦Single 1.8V to 5.5V Supply Voltage Range

♦Ultra-Low 1pA Input Bias Current

♦Rail-to-Rail Input and Output Voltage Ranges

♦Low ±200µV Input Offset Voltage

♦Low 0.001µA Shutdown Current

♦High-Impedance Output During Shutdown

♦Unity-Gain Stable

♦Available in a Tiny, 0.9mm x 1.3mm, 6-Bump WLP Package

	Applications		Ordering Information
Cell Phones
		PART	TEMP RANGE	PIN-	TOP
Tablet/Notebook Computers
				PACKAGE	MARK

Mobile Accessories
		MAX44265EWT+	-40°C to +85°C 6 WLP		+BY
Battery-Powered Devices

MAX44265

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

MAX44265

Rail-to-Rail, 200kHz Op Amp

with Shutdown in a Tiny, 6-Bump WLP

ABSOLUTE MAXIMUM RATINGS

Power-Supply Voltage (VDD to VSS)	......................	-0.3V to +6.0V
IN_+, IN_-, OUT_, SHDN_...............	(V SS - 0.3V) to (VDD + 0.3V)
Current into IN_+, IN_- ......................................................			±20mA
Output Short-Circuit Duration to VDD ..............or VSS			Continuous
Continuous Power Dissipation (TA = +70°C)
6-Bump WLP (derate 10.5mW/°C above +70°C)			.........840mW

Operating Temperature Range	.......................... -40°C to +85°C
Junction Temperature .....................................................	+150°C
Storage Temperature Range ............................	-65°C to +150°C
Soldering Temperature (reflow) .......................................	+260°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ connected to VDD/2, SHDN_ = VDD, TA = +25°C, unless otherwise noted.) (Note 1)

PARAMETER	SYMBOL	CONDITIONS		MIN	TYP	MAX	UNITS

Supply Voltage Range	VDD	Guaranteed by PSRR test		1.8		5.5	V
Supply Current	IDD	VDD = 1.8V			4		µA
Supply Current	IDD	VDD = 5.5V			4	5.0	µA
		VDD = 5.5V			4	5.0
Shutdown Supply Current	IDD(SHDN_)	SHDN_ = GND			0.001	0.5	µA
Input Offset Voltage	VOS				±0.2	±1	mV
Input Bias Current	IB	(Note 2)			±1	±10	pA
Input Offset Current	IOS	(Note 2)			±1	±10	pA
Input Resistance	RIN	Common mode			1		GΩ

		Differential mode, -1mV < VIN < +1mV			10
		Differential mode, -1mV < VIN < +1mV			10
Input Common-Mode Range	VCM	Guaranteed by CMRR test		VSS -		VDD +	V
Input Common-Mode Range	VCM	Guaranteed by CMRR test		0.1		0.1	V
				0.1		0.1

Common-Mode Rejection Ratio	CMRR	-0.1V < VCM < VDD + 0.1V, VDD = 5.5V		70	80		dB
Power-Supply Rejection Ratio	PSRR	1.8V < VDD < 5.5V		65	95		dB
		25mV < VOUT < VDD - 25mV,		95	120
		RL = 100kΩ, VDD = 5.5V		95	120
Open-Loop Gain	AVOL	RL = 100kΩ, VDD = 5.5V					dB
Open-Loop Gain	AVOL	100mV < VOUT < VDD - 100mV,		95	110		dB
		100mV < VOUT < VDD - 100mV,
		RL = 5kΩ, VDD = 5.5V
		RL = 5kΩ, VDD = 5.5V
			RL = 100kΩ		2.5	5
Output-Voltage-Swing High	VOH	VDD - VOUT	RL = 5kΩ		50	70	mV
			RL = 1kΩ		250
			RL = 100kΩ		2.5	5
Output-Voltage-Swing Low	VOL	VOUT - VSS	RL = 5kΩ		50	70	mV
			RL = 1kΩ		250
Output Short-Circuit Current	IOUT(SC)				±15		mA

2 _______________________________________________________________________________________

Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP

ELECTRICAL CHARACTERISTICS (continued)

(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ connected to VDD/2, SHDN_ = VDD, TA = +25°C, unless otherwise noted.) (Note 1)

PARAMETER	SYMBOL		CONDITIONS		MIN	TYP	MAX	UNITS

SHDN_ Logic Low	VIL	VDD = 1.8V to 3.6V					0.4	V
SHDN_ Logic Low	VIL	VDD = 3.6V to 5.5V					0.8	V
		VDD = 3.6V to 5.5V					0.8
SHDN_ Logic High	VIH	VDD = 1.8V to 3.6V			1.4			V
SHDN_ Logic High	VIH	VDD = 3.6V to 5.5V			2			V
		VDD = 3.6V to 5.5V			2
SHDN_ Input Bias Current	IIL	SHDN_ = VSS (Note 2)					1	nA
SHDN_ Input Bias Current	IIH	SHDN_ = VDD					500	nA
	IIH	SHDN_ = VDD					500
Output Leakage in Shutdown	IOUT(SHDN_)	SHDN_ = VSS, VOUT = 0V to VDD				1	500	nA
Gain-Bandwidth Product						200		kHz

Slew Rate						0.1		V/µs
Capacitive-Load Stability (See				AV = 1V/V		30
Capacitive-Load Stability (See		No sustained		AV = 10V/V		250
the Driving Capacitive Loads	CLOAD	No sustained		AV = 10V/V		250		pF
the Driving Capacitive Loads	CLOAD	oscillations		RL = 5kΩ, AV = 1V/V		200		pF
Section)		oscillations		RL = 5kΩ, AV = 1V/V		200
Section)				RISO = 1kΩ, AV = 1V/V		100
				RISO = 1kΩ, AV = 1V/V		100
Input Voltage-Noise Density		f = 1kHz				400		nV/√Hz
Input Current-Noise Density		f = 1kHz				0.001		pA/√Hz
Settling Time		To 0.1%, VOUT = 2V step, AV = -1V/V				18		µs
Delay Time to Shutdown	tSH	IDD = 5% of normal operation,				2		µs
Delay Time to Shutdown	tSH	VDD = 5.5V, VSHDN_ = 5.5V to 0 step				2		µs
		VDD = 5.5V, VSHDN_ = 5.5V to 0 step
Delay Time to Enable	tEN	VOUT = 2.7V, VOUT settles to 0.1%,				30		µs
Delay Time to Enable	tEN	VDD = 5.5V, VSHDN_ = 0 to 5.5V step				30		µs
		VDD = 5.5V, VSHDN_ = 0 to 5.5V step
Power-Up Time		VDD = 0 to 5.5V step				5		µs

MAX44265

ELECTRICAL CHARACTERISTICS

(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ connected to VDD/2, SHDN_ = VDD, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER	SYMBOL	CONDITIONS	MIN	TYP	MAX	UNITS

Supply Voltage Range	VDD	Guaranteed by PSRR test	1.8		5.5	V
Supply Current	IDD	VDD = 5.5V			5.5	µA
Shutdown Supply Current	IDD(SHDN_)	SHDN_ = GND			1	µA
Input Offset Voltage	VOS				±5	mV
Input-Offset-Voltage	TCVOS			±5		µV/°C
Temperature Coefficient	TCVOS			±5		µV/°C
Temperature Coefficient

_______________________________________________________________________________________ 3

MAX44265

Rail-to-Rail, 200kHz Op Amp

with Shutdown in a Tiny, 6-Bump WLP

ELECTRICAL CHARACTERISTICS (continued)

(VDD = 1.8V to 5.5V, VSS = 0V, VCM = 0V, VOUT = VDD/2, RL = ∞ connected to VDD/2, SHDN_ = VDD, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER	SYMBOL	CONDITIONS		MIN	TYP	MAX	UNITS

Input Bias Current	IB					±30	pA
Input Offset Current	IOS					±20	pA
Input Common-Mode Range	VCM	Guaranteed by CMRR test		VSS -		VDD +	V
Input Common-Mode Range	VCM	Guaranteed by CMRR test		0.05		0.05	V
				0.05		0.05

Common-Mode Rejection Ratio	CMRR	-0.05V < VCM < VDD + 0.05V, VDD = 5.5V		60			dB
Power-Supply Rejection Ratio	PSRR	1.8V < VDD < 5.5V		59			dB
		25mV < VOUT < VDD - 25mV,		85
		RL = 100kΩ, VDD = 5.5V		85
Open-Loop Gain	AVOL	RL = 100kΩ, VDD = 5.5V					dB
Open-Loop Gain	AVOL	150mV < VOUT < VDD - 150mV,		80			dB
		150mV < VOUT < VDD - 150mV,
		RL = 5kΩ, VDD = 5.5V
		RL = 5kΩ, VDD = 5.5V
Output-Voltage-Swing High	VOH	VDD - VOUT	RL = 100kΩ			5	mV
Output-Voltage-Swing High	VOH	VDD - VOUT	RL = 5kΩ			90	mV
			RL = 5kΩ			90
Output-Voltage-Swing Low	VOL	VOUT - VSS	RL = 100kΩ			5	mV
Output-Voltage-Swing Low	VOL	VOUT - VSS	RL = 5kΩ			90	mV
			RL = 5kΩ			90
SHDN_ Logic Low	VIL	VDD = 1.8V to 3.6V				0.4	V
SHDN_ Logic Low	VIL	VDD = 3.6V to 5.5V				0.8	V
		VDD = 3.6V to 5.5V				0.8
SHDN_ Logic High	VIH	VDD = 1.8V to 3.6V		1.4			V
SHDN_ Logic High	VIH	VDD = 3.6V to 5.5V		2			V
		VDD = 3.6V to 5.5V		2
SHDN_ Input-Bias Current	IIL	SHDN_ = VSS				5	nA
SHDN_ Input-Bias Current	IIH	SHDN_ = VDD				1000	nA
	IIH	SHDN_ = VDD				1000	nA
Output Leakage in Shutdown	IOUT(SHDN_)	SHDN_ = VSS, VOUT = 0V to VDD				1000	nA

Note 1: Specifications are 100% tested at TA = +25°C (exceptions noted). All temperature limits are guaranteed by design. Note 2: Guaranteed by design, not production tested.

4 _______________________________________________________________________________________

Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP

Typical Operating Characteristics

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

SUPPLY CURRENT	SHUTDOWN SUPPLY CURRENT
vs. SUPPLY VOLTAGE	vs. TEMPERATURE

	9					toc01		12
						toc01
	8					MAX44265	CURRENT (nA)	10
								10
	7
	6							8
A)	6
A)
(	5				TA = -40°C		SUPPLY	6
CC	5		TA = +25°C					6
CC
I	4
	4						SHUTDOWN	4
								4
	3
	2			TA = +85°C				2
	2
	1							0
	1.8	2.6	3.4	4.2	5.0	5.5

					toc02		1000
					toc02
					MAX44265		750
					MAX44265		500
							500
						( V)	250
						( V)	0
						OS	0
						OS
						V
							-250
							-500
							-750
-40	-15	10	35	60	85	-1000
-40	-15	10	35	60	85

INPUT OFFSET VOLTAGE

vs. INPUT COMMON-MODE VOLTAGE

				TA = -40°C		MAX44265 toc03
				TA = -40°C
		TA = +25°C
		TA = +85°C
0	0.5	1.0	1.5	2.0	2.5	3.0

VSUPPLY (V)	TEMPERATURE (°C)	VCM (V)
INPUT OFFSET VOLTAGE	INPUT BIAS CURRENT	INPUT BIAS CURRENT
vs. TEMPERATURE	vs. TEMPERATURE	vs. INPUT COMMON-MODE VOLTAGE

	200					toc04	7
	150					toc04	6
	150					MAX44265	6
	100					MAX44265	5
	50						5
	50						4
	0						4
( V)	0						3
	-50					(pA)	3
	-50						2

OS	-100					B
V	-100					I	1
	-150						1
	-150						0
	-200						0
	-200
	-250						-1
	-300						-2
	-350	-15	10	35	60		-3
	-40	-15	10	35	60	85

					toc05		5
					toc05		4
					MAX44265		4
					MAX44265		3
							2
		IB-				(pA)	1
						(pA)	0
						B	0
						B
						I	-1
							-1
		IB+					-2
		IB+
							-3
							-4
-40	-15	10	35	60	85		-5
-40	-15	10	35	60	85

								MAX44265 toc06
-0.5	0	0.5	1.0	1.5	2.0	2.5	3.0	3.5

TEMPERATURE (°C)	°	VCM (V)
	TEMPERATURE ( C)	VCM (V)

POWER-SUPPLY REJECTION RATIO	COMMON-MODE REJECTION RATIO
vs. FREQUENCY	vs. TEMPERATURE

	0					toc07	140
						toc07
	-20					MAX44265	120
	-20

	-40						100
	-40					(dB)
(dB)						(dB)	80
PSRR	-60					CMRR
PSRR						CMRR	60
	-80						40
							40
	-100						20
							20
	-120	1	10	100	1k		0
	0.1	1	10	100	1k	10k

					toc08		0
					toc08		-10
					MAX44265		-10
					MAX44265		-20
							-30
						(dB)	-40
						(dB)
						CMRR	-50
						CMRR	-60
							-60
							-70
							-80
							-90
-40	-15	10	35	60	85		-100
-40	-15	10	35	60	85

COMMON-MODE REJECTION RATIO vs. FREQUENCY

					MAX44265 toc09
1	10	100	1k	10k	100k

FREQUENCY (Hz)

TEMPERATURE (°C)

FREQUENCY (Hz)

MAX44265

_______________________________________________________________________________________ 5

Rail-to-Rail, 200kHz Op Amp

with Shutdown in a Tiny, 6-Bump WLP

MAX44265

Typical Operating Characteristics (continued)

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

SLEW RATE

vs. SUPPLY VOLTAGE

	0.6					toc10
	0.5					toc10
	0.5					MAX44265
	0.4					MAX44265
S)	0.3
(V/	0.2
RATE	0.1
SLEW	0
SLEW	-0.1
	-0.1
	-0.2
	-0.3
	-0.4	2.6	3.4	4.2	5.0
	1.8	2.6	3.4	4.2	5.0	5.5

SUPPLY VOLTAGE (V)

OUTPUT-SWING HIGH	OUTPUT-SWING LOW
vs. TEMPERATURE	vs. TEMPERATURE

	1000					toc11	10000
						toc11
		RL = 1kΩ				MAX44265	(mV)
(mV)						MAX44265	(mV)	1000
SWING							SWING	1000
	100				RL = 5kΩ

VOLTAGE							VOLTAGE	100
VOLTAGE							VOLTAGE
OUTPUT	10						OUTPUT
	RL = 100kΩ							10
				RL TO VSS
				RL TO VSS
				VOH = VDD - VOUT
	1	-15	10	35	60			1
	-40	-15	10	35	60	85

TEMPERATURE (°C)

VOL = VOUT - VSS	toc12
RL TO VDD	MAX44265
RL = 1kΩ	MAX44265
RL = 5kΩ
RL = 100kΩ

-40	-15	10	35	60	85
		TEMPERATURE (°C)

OPEN-LOOP GAIN

vs. TEMPERATURE (RL TO VSS)

	140			RL = 100kΩ			toc13
				RL = 100kΩ			toc13
	120						MAX44265
							MAX44265
	100
(dB)	80			RL = 5kΩ
	80

VOL	60			R	L	= 1kΩ
A					L

	40
	20
	0
	-40	-15	10	35		60	85
			TEMPERATURE (°C)

OPEN-LOOP GAIN

vs. TEMPERATURE (RL TO VDD)

	140		RL = 100kΩ			toc14		80
						toc14
						MAX44265		60
	120							60
	120
								40
	100				RL = 5kΩ			40
	100				RL = 5kΩ
(dB)	80						(dB)	20
(dB)	80						(dB)	0
VOL				RL = 1kΩ			GAIN	0
VOL	60			RL = 1kΩ
A								-20


	40							-40
								-40
	20							-60
	0							-80
	-40	-15	10	35	60	85
			TEMPERATURE (°C)

GAIN AND PHASE

vs. FREQUENCY (RL = ∞, CLOAD = 15pF)

					MAX44265 toc15		180
	GAIN			AV = 1000V/V			135
							135
							90
							45	(DEGREES)
	PHASE						0
							0
							-45	PHASE
								PHASE
							-90
							-135
1	10	100	1k	10k	100k	1M	-180
1	10	100	1k	10k	100k	1M
		FREQUENCY (Hz)

GAIN (dB)

GAIN AND PHASE

vs. FREQUENCY (RL = 5kΩ, CLOAD = 100pF)

100					MAX44265 toc16 225
80				AV = 1000V/V		180
80	GAIN					180
60	GAIN					135
60						135
40						90
20	PHASE					45
0	PHASE					0
0						0
-20						-45
-40						-90
-60						-135
-60
-80						-180
-100						-225
1	10	100	1k	10k	100k	1M

FREQUENCY (Hz)

PHASE (DEGREES)

THD+N (dB)

	TOTAL HARMONIC DISTORTION
	PLUS NOISE vs. FREQUENCY
-5	toc17
	toc17
-15	MAX44265
-15
-25
-35
-45
-55
-65
-75	VOUT = 2VP-P
-85

-95

100

10k

FREQUENCY (Hz)

6 _______________________________________________________________________________________

Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP

Typical Operating Characteristics (continued)

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

VOLTAGE-NOISE DENSITY vs. FREQUENCY

10,000						MAX44265 toc18
(nV/√Hz)						MAX44265 toc18
(nV/√Hz)
VOLTAGE NOISE	1000
VOLTAGE NOISE
	100
	1	10	100	1k	10k	100k

FREQUENCY (Hz)

SHUTDOWN RESPONSE

MAX44265 toc21

IN+ = VDD / 2

AV = 1V/V 3V

SHDN

1.5V

OUTPUT

RESISTOR ISOLATION	POWER-UP SETTLING TIME
vs. CAPACITIVE LOAD

MAX44265 toc20

	8000		AV = 1V/V		toc19
					toc19
	7000				MAX44265	VDD
			NO RISO NEEDED		MAX44265	VDD
			FOR AV = 10V/V
	6000					1V/div
						1V/div
)	5000
(Ω	4000
ISO	4000
ISO
R
	3000
	2000					OUTPUT
	2000					500mV/div
						500mV/div
	1000
	0	100	1000			500ns/div
	10	100	1000	10,000		500ns/div
			CLOAD (pF)

	SMALL-SIGNAL PULSE RESPONSE			SMALL-SIGNAL PULSE RESPONSE
	(CLOAD = 15pF)			(CLOAD = 100pF)
		MAX44265 toc22			MAX44265 toc23

		AV = 1V/V			AV = 10V/V
IN+
IN+			IN+
50mV/div			5mV/div

OUTPUT	OUTPUT
50mV/div	50mV/div

20 s/div 10 s/div 20 s/div

	LARGE-SIGNAL PULSE RESPONSE			LARGE-SIGNAL PULSE RESPONSE
	(CLOAD = 15pF)			(CLOAD = 100pF)
		MAX44265 toc24			MAX44265 toc25

		AV = 1V/V			AV = 10V/V
IN+			IN+
1V/div			100mV/div

OUTPUT		OUTPUT
1V/div		1V/div

	10 s/div		100 s/div

MAX44265

_______________________________________________________________________________________ 7

MAX44265

Rail-to-Rail, 200kHz Op Amp

with Shutdown in a Tiny, 6-Bump WLP

Typical Operating Characteristics (continued)

(VDD = 3V, VSS = VCM = 0V, RL to VDD/2, TA = +25°C, unless otherwise noted.)

SMALL-SIGNAL GAIN vs. FREQUENCY

	10	AV = +1V/V		toc26
	8	AV = +1V/V		toc26
	8	VOUT = 100mVP-P		MAX44265
	6	CLOAD = 15pF		MAX44265
	4
(dB)	2
(dB)	0
GAIN	0
GAIN	-2
	-2
	-4
	-6
	-8
	-10	10	100
	1	10	100	1000

FREQUENCY (kHz)

GAIN (dB)

	LARGE-SIGNAL GAIN
	vs. FREQUENCY
4	AV = +1V/V	toc27
	AV = +1V/V	toc27
	CLOAD = 15pF	MAX44265
3	VOUT = 2VP-P
2
1
0
-1
-2
-3
-4
1	10	100
	FREQUENCY (kHz)

PERCENT OVERSHOOT	OUTPUT WAVEFORM WITH RISO
vs. CAPACITIVE LOAD	(CLOAD = 100pF, RISO = 6.2kΩ)

	4.0						MAX44265 toc29
	4.0	AV = 1V/V				toc28	AV = 1V/V
		AV = 1V/V				toc28	AV = 1V/V
	3.5			RL = 1MΩ		MAX44265	IN+
	3.5			RL = 1MΩ

	3.0						50mV/div
	3.0
(%)	2.5			RL = 100kΩ
OVERSHOOT	2.5
	1.5
	1.5
	2.0
							OUTPUT
	1.0						50mV/div
	1.0
	0.5			RL = 10kΩ
	0	20	40	60	80		20 s/div
	0	20	40	60	80	100	20 s/div
			CLOAD (pF)

OUTPUT WAVEFORM WITHOUT RISO

(CLOAD = 100pF)

MAX44265 toc30

AV = 1V/V

IN+

50mV/div

OUTPUT 50mV/div

20 s/div

8 _______________________________________________________________________________________

Rail-to-Rail, 200kHz Op Amp with Shutdown in a Tiny, 6-Bump WLP

Pin Configuration

TOP VIEW

MAX44265

+ IN+	VSS
A1	A2
IN-	VDD
B1	B2
OUT	SHDN
C1	C2

WLP BUMP

SIDE DOWN

MAX44265

Pin Description

PIN	NAME	FUNCTION

A1	IN+	Noninverting Amplifier Input
A2	VSS	Negative Supply Voltage
B1	IN-	Inverting Amplifier Input

C1	OUT	Amplifier Output

B2	VDD	Positive Supply Voltage
C2	SHDN	Shutdown

_______________________________________________________________________________________ 9

MAX44265

Rail-to-Rail, 200kHz Op Amp

with Shutdown in a Tiny, 6-Bump WLP

Detailed Description

Featuring a maximized ratio of GBW to supply current, low operating supply voltage, low input bias current, and rail-to-rail inputs and outputs, the MAX44265 is an excellent choice for precision or general-purpose, lowcurrent, low-voltage, battery-powered applications. This CMOS device consumes an ultra-low 4µA (typ) supply current and has a 200µV (typ) offset voltage. For additional power conservation, the IC features a low-power shutdown mode that reduces supply current to 1nA (typ) and puts the amplifier’s output in a high-imped- ance state. This device is unity-gain stable with a 200kHz GBW product, driving capacitive loads up to 30pF. The capacitive load can be increased to 250pF when the amplifier is configured for a 10V/V gain.

Rail-to-Rail Inputs and Outputs

The IC has a parallel-connected n- and p-channel differential input stage that allows an input common-mode voltage range that extends 100mV beyond the positive and negative supply rails, with excellent common-mode rejection. The IC is capable of driving the output to within 5mV of both supply rails with a 100kΩ load. This device can drive a 5kΩ load with swings to within 60mV of the rails. Figure 1 shows the output voltage swing of the IC configured as a unity-gain buffer powered from a single 3V supply.

Low Input Bias Current

The IC features ultra-low 1pA (typ) input bias current. The variation in the input bias current is minimal with changes in the input voltage due to very high input impedance (in the order of 1GΩ).

Applications Information

Driving Capacitive Loads

The IC’s amplifier is unity-gain stable for loads up to 30pF. However, the capacitive load can be increased to 250pF when the amplifier is configured for a minimum gain of 10V/V. Applications that require greater capacitive-drive capability should use an isolation resistor between the output and the capacitive load (Figure 2). Also, in unity-gain applications with relatively small RL (approximately 5kΩ), the capacitive load can be increased up to 200pF.

RAIL-TO-RAIL OUTPUT VOLTAGE RANGE

IN_

1V/div

OUT_

1V/div

200 s/div

Figure 1. Rail-to-Rail Output Voltage Range

MAX44265

RISO

RL CL

AV = RL + RISO ≈ 1V/V

Figure 2. Using a Resistor to Isolate a Capacitive Load from the Op Amp

10 ______________________________________________________________________________________

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