Rainbow Electronics MAX9610 User Manual

General Description

The MAX9610 high-side current-sense amplifier offers
precision accuracy specifications of VOSless than
500μV (max) and gain error less than 0.5% (max). This
device features an ultra-low 1μA quiescent supply cur­rent. The MAX9610 fits in a tiny, 1mm x 1.5mm μDFN
package or a 5-pin SC70 package, making this part
ideal for applications in notebook computers, cell
phones, cameras, PDAs, and all lithium-ion battery­operated portable devices where accuracy, low quies­cent current, and small size are critical.

The MAX9610 features an input voltage range (com­mon mode) from 1.6V to 5.5V. This input range is excel­lent for monitoring the current of a single-cell,
lithium-ion battery (Li+), which at full charge is 4.2V,
typically 3.6V in normal use, and less than 2.9V when
ready to be recharged. These current-sense amplifiers
have a voltage output and are offered in three gain ver­sions: 25V/V (MAX9610T), 50V/V (MAX9610F), and
100V/V (MAX9610H).

The three gain versions offer flexibility in the choice of
the external current-sense resistor. The very low 500μV
(max) input offset voltage allows small 25mV to 50mV
full-scale V

SENSE

voltage for very low voltage drop at

full-load current measurement.

The MAX9610 is offered in tiny 6-pin μDFN, (1mm x

1.5mm x 0.8mm footprint) and 5-pin SC70 packages,
specified for operation over the -40°C to +85°C temper­ature range.

For a very similar 1.6V to 28V input voltage device in a
4-bump UCSP™ package (1mm x 1mm x 0.6mm), refer
to the MAX9938 data sheet.

Applications

Cell Phones

Cameras

Portable Li+ Battery Powered Systems

3.3V and 5V Power Management Systems

PDAs

USB Ports

Features

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

♦ Low 500µV (max) Input Offset Voltage

♦ Low < 0.5% (max) Gain Error

♦ Input Common Mode: +1.6V to +5.5V

♦ Voltage Output

♦ Three Gain Versions Available

25V/V (MAX9610T)
50V/V (MAX9610F)
100V/V (MAX9610H)

♦ Tiny µDFN (1mm x 1.5mm x 0.8mm) and

SC70 Packages

MAX9610

1µA, µDFN/SC70, Lithium-Ion Battery,

Precision Current-Sense Amplifier

________________________________________________________________

Maxim Integrated Products

1

19-4342; Rev 0; 10/08

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.

Pin Configurations appear at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

MAX9610

P

R

OUT

10kΩ

GND

OUT

ADC

μC

LOAD

V

DD

= 3.3V

RS-

RS+

R

SENSE

I

LOAD

V

BATT

=

1.6V to 5.5V

R

1

R

1

Typical Operating Circuit

Ordering Information

PART*

PIN-

GAIN

(V/V)

TOP MARK

MAX9610TELT+T 6 μDFN 25 OU

MAX9610FELT+T 6 μDFN 50 OS

MAX9610HELT+T 6 μDFN 100 OT

MAX9610TEXK+T 5 SC70 25 ATG

MAX9610FEXK+T 5 SC70 50 ATE

MAX9610HEXK+T 5 SC70 100 ATF

*

All devices are specified over the -40°C to +85°C extended

temperature range.

+

Denotes a lead-free/RoHS-compliant package.

T = Tape and reel.

PACKAGE

MAX9610

1µA, µDFN/SC70, Lithium-Ion Battery,
Precision Current-Sense Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

RS+

= V

RS-

= 3.6V, V

SENSE

= (V

RS+

- V

RS-

) = 0, 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 +6V

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

RS+ to RS- .............................................................................±6V

Short-Circuit Duration: OUT to GND or RS+ ..............Continuous

Continuous Input Current (Any Pin)..................................±20mA

Continuous Power Dissipation (T

A

= +70°C)

5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW

6-Pin μDFN (derate 2.1mW/°C above +70°C) .............168mW

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

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

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

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

Package Reflow Soldering Temperature .........................+260°C

PARAMETER

CONDITIONS

UNITS

V

RS+

= 3.6V, TA = +25°C 0.6 1.0

V

RS+

= 3.6V, -40°C < TA < +85°C 1.4

V

RS+

= 5.5V, TA = +25°C

1.2

Supply Current
(Note 2)

I

CC

V

RS+

= 5.5V, -40°C < TA < +85°C 1.6

μA

Common-Mode Input Range V

CM

Guaranteed by CMRR,

-40°C < T

A

< +85°C

1.6 5.5 V

Common-Mode Rejection Ratio CMRR

80

dB

TA = +25°C, gain = 25, 50, 100 (Note 3)

Gain = 25, 50

Input Offset Voltage V

OS

Gain = 100

μV

MAX9610T 25

MAX9610F 50Gain G

MAX9610H

V/V

TA = +25°C, gain = 25, 50, 100 (Note 4)

Gain = 25, 50

Gain Error GE

Gain = 100 ±1

%

Output Resistance R

OUT

TA = +25°C (Note 5) 7.0 10

kΩ

G = 25 2.5 15

G = 50 5 30

OUT Low Voltage V

OL

G = 100 10 70

mV

OUT High Voltage V

OH

VOH = V

RS-

- V

OUT

(Note 6) 0.1 0.2 V

SYMBOL

MIN TYP MAX

0.75

1.6V < V

-40°C < TA < +85°C

-40°C < TA < +85°C

< 5.5V, -40°C < TA < +85°C

RS+

104

±100 ±500

±600

±700

100

±0.1 ±0.5

±0.8

13.2

MAX9610

1µA, µDFN/SC70, Lithium-Ion Battery,

Precision Current-Sense Amplifier

_______________________________________________________________________________________ 3

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

V

SENSE

= 50mV, G = 25

V

SENSE

= 50mV, G = 50

Small-Signal Bandwidth BW

V

SENSE

= 50mV, G = 100 60

kHz

Output Settling Time t

S

1% final value, V

SENSE

= 25mV 35 μs

Power-Up Time t

ON

1% final value, V

SENSE

= 25mV

μs

ELECTRICAL CHARACTERISTICS (continued)

(V

RS+

= V

RS-

= 3.6V, V

SENSE

= (V

RS+

- V

RS-

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

(Note 1)

Note 1: All devices are 100% production tested at T

A

= +25°C. All temperature limits are guaranteed by design.

Note 2: V

OUT

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

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:

G = 25: V

SENSE

20mV and 120mV

G = 50: V

SENSE

10mV and 60mV

G = 100: V

SENSE

5mV and 30mV

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.

Typical Operating Characteristics

(V

RS+

= V

RS-

= 3.6V, TA= +25°C.)

20

15

10

5

0

-250

-200-150 -100 -50 0

25020015010050

MAX9610F

OFFSET VOLTAGE HISTOGRAM

MAX9610 toc01

OFFSET VOLTAGE (μV)

N (%)

30

25

20

15

10

5

0

-0.2

-0.15 -0.1 -0.05 0

0.20.150.10.05

MAX9610F

GAIN ACCURACY HISTOGRAM

MAX9610 toc02

GAIN ACCURACY (%)

N (%)

0

300

200

100

400

500

600

700

800

900

1000

-40 10-15 35 60 85

SUPPLY CURRENT

vs. TEMPERATURE

MAX9610 toc03

TEMPERATURE (°C)

SUPPLY CURRENT (nA)

5.5V

3.6V

1.6V

170

110

100

MAX9610

1µA, µDFN/SC70, Lithium-Ion Battery,
Precision Current-Sense Amplifier

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V

RS+

= V

RS-

= 3.6V, TA= +25°C.)

SUPPLY CURRENT

vs. COMMON-MODE VOLTAGE

MAX9610 toc04

COMMON-MODE VOLTAGE (V)

SUPPLY CURRENT (μA)

4.64.13.1 3.62.62.1

0.10

0.20

0.30

0.40

0.50

0.60

0.70

0.80

0.90

1.00

0

1.6 5.5

0

30

20

10

40

50

60

70

80

90

100

-40 10-15 35 60 85

OFFSET VOLTAGE

vs. TEMPERATURE

MAX9610 toc05

TEMPERATURE (°C)

OFFSET VOLTAGE (μV)

0

10

20

30

40

50

60

1.6 2.62.1 3.1 3.6 4.1 4.6 5.1

5.5

OFFSET VOLTAGE

vs. COMMON-MODE VOLTAGE

MAX9610 toc06

COMMON-MODE VOLTAGE (V)

OFFSET VOLTAGE (μV)

GAIN ERROR vs. TEMPERATURE

MAX9610 toc07

TEMPERATURE (°C)

GAIN ERROR (%)

603510-15

0.07%

0.09%

0.11%

0.13%

0.15%

0.17%

0.19%

0.21%

0.23%

0.25%

0.05%

-40 85

-0.20%

-0.16%

-0.18%

-0.12%

-0.14%

-0.08%

-0.10%

-0.06%

-0.02%

-0.04%

0%

1.6 2.6 3.12.1 3.6 4.1 4.6 5.1 5.5

GAIN ERROR

vs. COMMON-MODE VOLTAGE

MAX9610 toc08

COMMON-MODE VOLTAGE (V)

GAIN ERROR (%)

V

OUT

vs. V

SENSE

V

RS+

= 5.5V

MAX9610 toc09

V

SENSE

(mV)

V

OUT

(V)

20015010050

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

0

0 250

G = 25

G = 50

G = 100

0

0.8

0.6

0.4

0.2

1.0

1.2

1.6

1.4

1.8

010 4020 6050 7030 80

V

OUT

vs. V

SENSE

V

RS+

= 1.6V

MAX9610 toc10

V

SENSE

(mV)

V

OUT

(V)

G = 25

G = 50

G = 100

NORMALIZED GAIN

vs. FREQUENCY

MAX9610 toc11

FREQUENCY (kHz)

NORMALIZED GAIN (dB)

100101

-20

-15

-10

-5

0

5

-25

0.1 1000

G = 25

G = 50

G = 100

CMRR vs. FREQUENCY

MAX9610 toc12

FREQUENCY (Hz)

CMRR (dB)

10k1k100

-120

-100

-80

-60

-40

-20

-140
10 100k