MAX44285EVKIT datasheet(2/6 Pages) MAXIM

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Evaluates: MAX44285

MAX44285 Evaluation Kit

Detailed Description of Hardware

The MAX44285 EV kit provides a proven design to evalu-

ate the MAX44285 high-side, dual-channel, current-sense

amplifier, which offers precision accuracy specifications of

input offset voltage (VOS) less than 10µV (max) and gain

error less than 0.1% (max).

Applying the VRS+ Supply and the Load

The EV kit is installed with a MAX44285TAWA+, which

has a 20V/V gain. The current-sense resistors (RSENSE)

value is 0.05Ω with ±0.5% tolerance. The VOUT for each

channel given by:

VOUT = ILOAD x RSENSE x AV

where AV is the gain and ILOAD is the current load applied

to the device. Normal operating VRS+ and VRS- range is

2.7V to 76V.

Measuring the Load Current

The load current is measured as a voltage drop (VSENSE)

across an external sense resistor. This voltage is then

amplified by the current-sense amplifier and presented at

its VOUT_ pin. Like all differential amplifiers, the output

voltage has two components of error (an offset error and

a gain error). The offset error affects accuracy at low cur-

rents and a gain error affects accuracy at large currents−

both errors affect accuracy at intermediate currents. By

minimizing both offset and gain errors, accuracy can be

optimized over a wide dynamic range.

DESIGNATION

QTY

DESCRIPTION

0.1µF ±10%, 16V SMT

ceramic capacitor (0603)

4.7µF ±10%, 16V SMT

ceramic capacitor (0805)

C3–C8

1000pF ±10%, 50V SMT

ceramic capacitors (1206)

C9, C10

180pF ±10%, 50V SMT

ceramic capacitors (0603)

GND, TP1–TP4

Test points

R1, R2

0.05Ω ±0.5%, 0.5W resistors

(1206)

R3–R8

0Ω 0%, 0.10W resistors (0603)

DESIGNATION

QTY

DESCRIPTION

RS1+, RS1-,

RS2+, RS2-

Test points

Dual-channel, current-sense

amplifier (8 WLP)

Maxim MAX44285TAWA+

VDD, VOUT1,

VOUT2,

VSENSE1+

,VSENSE1,

VSENSE2+,

VSENSE2-

Red test points (1.80mm)

—

PCB: MAX44285 EVKIT

Component List

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