MAX9937(2008) 데이터 시트보기 (PDF) - Maxim Integrated

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MAX9937
(Rev.:2008)

Automotive Current-Sense Amplifier with Reverse-Battery Protection

Maxim Integrated 

Automotive Current-Sense Amplifier

with Reverse-Battery Protection

ELECTRICAL CHARACTERISTICS (continued)

(VCC = 5V, VBAT = VRS+ = 12V, VSENSE = (VRS+ - VRS-) = 0, 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

Maximum Output Current

Output-Voltage Compliance

(Note 6)

SYMBOL

CONDITIONS

IOUT

RRSN = 500Ω, RRSP = 0, VOUT = 0

VSENSE = 500mV, ΔIOUT ≤ 1%

VBAT = 4V, VSENSE = 0.1V, ΔIOUT ≤ 2%

MIN TYP MAX UNITS

2

7.5

22

mA

-0.1

VCC +

0.1

V

-0.1

VRSP - VRSP -

0.15 0.8

Output-Voltage High

Output-Voltage Low

AC CHARACTERISTICS

3dB Large-Signal Bandwidth

3dB Small-Signal Bandwidth

Settling Time to 1%

Input-Voltage Noise

Input Current Noise

VOH

VOL

VBAT = 4V, VSENSE = +500mV,

VOH = VBAT - VOUT

VBAT = 4V, VSENSE = -100mV

BW

VSENSE = 137.5mVDC + 225mVP-P

tS

en

f = 1kHz

In

f = 1kHz

0.4

1.2

V

2

20

mV

250

kHz

350

kHz

5

µs

28

nV/√Hz

1

pA/√Hz

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.

IB

=

IB+

+

2

IB-

ΔIB = |IB+ - IB- |

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-).

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