Rainbow Electronics MAX9634 User Manual

General Description

The MAX9634 high-side current-sense amplifier offers
precision accuracy specifications of V

OS

less than
250µV (max) and gain error less than 0.5% (max).
Quiescent supply current is an ultra-low 1µA. The
MAX9634 fits in a tiny, 1mm x 1mm UCSP™ package
size or a 5-pin SOT23 package, making the part ideal for
applications in notebook computers, cell phones, PDAs,
and all battery-operated portable devices where accura­cy, low quiescent current, and small size are critical.

The MAX9634 features an input common-mode voltage
range from 1.6V to 28V. These current-sense amplifiers
have a voltage output and are offered in four gain versions:
25V/V (MAX9634T), 50V/V (MAX9634F), 100V/V
(MAX9634H), and 200V/V (MAX9634W).

The four gain selections offer flexibility in the choice of
the external current-sense resistor. The very low 250µV
(max) input offset voltage allows small 25mV to 50mV
full-scale V

SENSE

voltage for very low voltage drop at

full-current measurement.

The MAX9634 is offered in tiny 4-bump UCSP (1mm x
1mm x 0.6mm footprint) and 5-pin SOT23 packages
specified for operation over the -40°C to +85°C extend­ed temperature range.

Applications

Cell Phones

PDAs

Power-Management Systems

Portable/Battery-Powered Systems

Notebook Computers

Features

o Ultra-Low Supply Current of 1µA (max)

o Low 250µV (max) Input Offset Voltage

o Low < 0.5% (max) Gain Error

o Input Common Mode: +1.6V to +28V

o Voltage Output

o Four Gain Versions Available

25V/V (MAX9634T)
50V/V (MAX9634F)
100V/V (MAX9634H)
200V/V (MAX9634W)

o Tiny 1mm x 1mm x 0.6mm, 4-Bump UCSP or

5-Pin SOT23 Packages

MAX9634

1µA, 4-Bump UCSP/SOT23,

Precision Current-Sense Amplifier

________________________________________________________________

Maxim Integrated Products

1

Pin Configurations

19-5021; Rev 1; 2/10

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.

EVALUATION KIT

AVAILABLE

UCSP is a trademark of Maxim Integrated Products, Inc.

Ordering Information

+

Denotes a lead(Pb)-free/RoHS-compliant package.

Note: All devices are specified over the -40°C to +85°C
extended temperature range.

PART

PIN-

GAIN

(V/V)

TOP

MARK

MAX9634TERS+ 4 UCSP 25 +ABX

MAX9634FERS+ 4 UCSP 50 +ABY

MAX9634HERS+ 4 UCSP 100 +ABZ

MAX9634WERS+ 4 UCSP 200 +ACA

MAX9634TEUK+ 5 SOT23 25

+AFHG

MAX9634FEUK+ 5 SOT23 50

+AFHH

MAX9634HEUK+ 5 SOT23 100 +AFHI

MAX9634WEUK+ 5 SOT23 200 +AFHJ

PACKAGE

TOP VIEW

(BUMPS ON BOTTOM)

A1

RS+

MAX9634T/F/H/W

B1 B2

GND

DRAWINGS NOT TO SCALE

UCSP

RS-A2

OUT

RS+ RS-

54

MAX9634T/F/H/W

132

GND OUTGND

SOT23

MAX9634

1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

RS+

= V

RS-

= 3.6V, V

SENSE

= (V

RS+

- V

RS-

) = 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

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.

RS+, RS- to GND....................................................-0.3V to +30V

OUT to GND .............................................................-0.3V to +6V

RS+ to RS- ...........................................................................±30V

Short-Circuit Duration: OUT to GND ..........................Continuous

Continuous Input Current (any pin) ..................................±20mA

Continuous Power Dissipation (T

A

= +70°C)

4-Bump UCSP (derate 3.0mW/°C above +70°C).........238mW

5-Pin SOT23 (derate 3.9mW/°C above +70°C)............312mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range ............................-65°C to +150°C

Bump Temperature (soldering) Reflow............................+260°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow) .......................................+260°C

Supply Current (Note 2) I

Common-Mode Input Range V

Common-Mode Rejection Ratio CMRR 1.6V < V

Input Offset Voltage (Note 3) V

Gain G

Gain Error (Note 4) GE

Output Resistance (Note 5) R

OUT Low Voltage V

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V

= 5V, TA = +25°C 0.5 0.85

RS+

V

= 5V, -40°C < TA < +85°C 1.1

CC

CM

OS

OUT

OL

RS+

V

= 28V, TA = +25°C 1.1 1.8

RS+

V

= 28V, -40°C < TA < +85°C 2.5

RS+

Guaranteed by CMRR, -40°C < TA < +85°C 1.6 28 V

RS+

MAX9634T/MAX9634F/
MAX9634H

MAX9634W

MAX9634T 25

MAX9634F 50

MAX9634H 100
MAX9634W 200

MAX9634T/MAX9634F/
MAX9634H

MAX9634W

MAX9634T/MAX9634F/MAX9634H 7.0 10 13.2

MAX9634W 14.0 20 26.4

Gain = 25 1.5 7.5

Gain = 50 3 15

Gain = 100 6 30
Gain = 200 12 85

< 28V, -40°C < TA < +85°C 94 130 dB

TA = +25°C 100 250

-40°C < T

TA = +25°C 100 250

-40°C < T

TA = +25°C ±0.1 ±0.5

-40°C < T

TA = +25°C ±0.1 ±0.7

-40°C < T

< +85°C 300

A

< +85°C 425

A

< +85°C ±0.6

A

< +85°C ±0.8

A

µA

µV

V/V

%

kΩ

mV

MAX9634

1µA, 4-Bump UCSP/SOT23,

Precision Current-Sense Amplifier

_______________________________________________________________________________________ 3

Note 1: All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2: V

OUT

= 0. ICCis the total current into RS+ plus RS- pins.

Note 3: V

OS

is extrapolated from measurements for the gain-error test.

Note 4: Gain error is calculated by applying two values of V

SENSE

and calculating the error of the slope vs. the ideal:

Gain = 25, V

SENSE

is 20mV and 120mV.

Gain = 50, V

SENSE

is 10mV and 60mV.

Gain = 100, V

SENSE

is 5mV and 30mV.

Gain = 200, V

SENSE

is 2.5mV and 15mV.

Note 5: The device is stable for any external capacitance value.
Note 6: V

OH

is the voltage from V

RS-

to V

OUT

with V

SENSE

= 3.6V/gain.

ELECTRICAL CHARACTERISTICS (continued)

(V

RS+

= V

RS-

= 3.6V, V

SENSE

= (V

RS+

- V

RS-

) = 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Typical Operating Characteristics

(V

RS+

= V

RS-

= 3.6V, TA= +25°C, unless otherwise noted.)

0

10

5

20

15

25

30

-0.4 -0.3 -0.2 -0.1 0 0.2 0.30.1 0.4

INPUT OFFSET VOLTAGE HISTOGRAM

MAX9634 toc01

INPUT OFFSET VOLTAGE (mV)

N (%)

0

10

5

20

15

25

30

-0.4 -0.3 -0.2 -0.1 0 0.2 0.30.1 0.4

GAIN ERROR HISTOGRAM

MAX9634 toc02

GAIN ERROR (%)

N (%)

SUPPLY CURRENT

vs. TEMPERATURE

MAX9634 toc03

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

10-15 35 60

0.4

0.2

0.6

0.8

1.0

1.2

1.4

28V

3.6V

1.8V

0

-40 85

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

OUT High Voltage V

Small-Signal Bandwidth
(Note 5)

Output Settling Time t

Power-Up Time t

V

= V

- V

OH

BW

ON

V

V

V

V

1% final value, V

S

1% final value, V

OH

RS-

= 50mV, gain = 25 125

SENSE

= 50mV, gain = 50 60

SENSE

= 50mV, gain = 100 30

SENSE

= 50mV, gain = 200 15

SENSE

(Note 6) 0.1 0.2 V

OUT

= 50mV 100 µs

SENSE

= 50mV 200 µs

SENSE

kHz

MAX9634

1µA, 4-Bump UCSP/SOT23,
Precision Current-Sense Amplifier

4 _______________________________________________________________________________________

GAIN

ERROR

(%)

Typical Operating Characteristics (continued)

(V

RS+

= V

RS-

= 3.6V, TA= +25°C, unless otherwise noted.)

INPUT OFFSET

vs. COMMON-MODE VOLTAGE

-30

-35

-40

-45

INPUT OFFSET (µV)

-50

-55
030

COMMON-MODE VOLTAGE (V)

GAIN ERROR

vs. COMMON-MODE VOLTAGE

0.1

0

-0.1

-0.2

-0.3

-0.4

-0.5

010155 202530

VOLTAGE (V)

INPUT OFFSET

vs. TEMPERATURE

MAX9634 toc05

1.4

1.2

1.0

0.8

0.6

SUPPLY CURRENT (µA)

0.4

0.2

0

0

60

MAX9634 toc04

252010515

50

40

30

INPUT OFFSET (µV)

20

10

0

10-15 35 60-40 85

TEMPERATURE (°C)

GAIN ERROR

vs. TEMPERATURE

MAX9634 toc07

0.08

0.07

0.06

0.05

0.04

0.03

GAIN ERROR (%)

0.02

0.01

0

-40

10 60 8535-15

TEMPERATURE (°C)

MAX9634 toc08

4.0

3.5

3.0

2.5

(V)

2.0

OUT

V

1.5

1.0

0.5

0

0150

SUPPLY CURRENT

vs. COMMON-MODE VOLTAGE

15 2010 30525

COMMON-MODE VOLTAGE (V)

V

vs. V

OUT

SENSE

(SUPPLY = 3.6V)

G = 100

G = 50

G = 25

10050

V

(mV)

SENSE

MAX9634 toc06

MAX9634 toc09

V

vs. V

OUT

SENSE

(SUPPLY = 1.6V)

1.8

1.6

1.4

1.2

V

G = 50

SENSE

G = 100

G = 25

80604020

(mV)

1.0

(V)

OUT

V

0.8

0.6

0.4

0.2

0

0100

MAX9634 toc10

5

0

-5

-10

GAIN (dB)

-15

-20

-25

-30
1

SMALL-SIGNAL GAIN

vs. FREQUENCY

AV = 25V/V

AV = 100V/V

AV = 50V/V

FREQUENCY (Hz)

0

vs. FREQUENCY

-20

MAX9634 toc11

-40

-60

-80

GAIN (dB)

-100

-120

-140

100k10 1M100 10k1k

-160

G = 25

1

CMRR

MAX9634 toc12

G = 50

G = 100

100k10 1M100 10k1k

FREQUENCY (Hz)