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

Note 3: Gain and offset voltage are calculated based on two point measurements: VSENSE1 = 5mV and VSENSE2 = 200mV.

Note 4: Input bias current IB+ and IB- refers to the internal op amp’s inputs (inverting and noninverting) so that IB- = IRSN and

IB+ = IRSP - IOUT

B

B-

B

B

B

B-

II

I

2

I

| I -I |

+

+

+

=

∆

=

Note 5: The gain is set by the external resistors RRSP and ROUT. See the Typical Application Circuit.

Note 6: VRSP = VBAT - VSENSE - VOS - (RRSN x IB-).

(VCC = 5V, VBAT = VRS+ = 12V, VSENSE = (VRS+ - VRS-) = 0V, RRSP = RRSN = 500Ω, ROUT = 10kΩ, TA = -40°C to +125°C. Typical

values are at TA = +25°C, unless otherwise noted. See the Typical Application Circuit.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Maximum Output Current

IOUT

RRSN = 500Ω, RRSP = 0, VOUT = 0V

2

7.5

22

mA

Output-Voltage Compliance

(Note 6)

VSENSE = 500mV, ∆IOUT ≤ 1%

-0.1

VCC +

0.1

V

VBAT = 4V, VSENSE = 0.1V, ∆IOUT ≤ 2%

-0.1

VRSP -

0.15

VRSP -

0.8

Output-Voltage High

VOH

VBAT = 4V, VSENSE = +500mV,

VOH = VBAT - VOUT

0.4

1.2

V

Output-Voltage Low

VOL

VBAT = 4V, VSENSE = -100mV

2

20

mV

AC CHARACTERISTICS

3dB Large-Signal Bandwidth

BW

VSENSE = 137.5mVDC + 225mVP-P

250

kHz

3dB Small-Signal Bandwidth

350

kHz

Settling Time to 1%

tS

5

µs

Input-Voltage Noise

en

f = 1kHz

28

nV/√Hz

Input Current Noise

In

f = 1kHz

1

pA/√Hz

www.maximintegrated.com

Maxim Integrated │ 3

MAX9937

Current-Sense Amplifier with

Reverse-Battery Protection

Electrical Characteristics (continued)