MP2671 – CHARGE SYSTEM PROTECTION CIRCUIT

MP2671 Rev. 0.9

www.MonolithicPower.com

4

2/23/2009

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TYPICAL PERFORMANCE CHARACTERISTICS

Input Steps

From 0V to 9V Waveform

Battery Overvoltage Protection

The IC is latched off after 16 counts of protection,

VB voltage varies between 4.3V to 4.5V

Input Steps

From 5.5V to 9.5V Waveform

Input Gradually Rises to

the Input OVP

Threshold Waveform

Input Steps

From 6.5V to 5.5V Waveform

4ms/div

4ms/div

400ms/div

10s/div

WRN (5V/DIV)

OUT (2V/DIV)

VIN (2V/DIV)

WRN (5V/DIV)

WRN (5V/DIV)

WRN (5V/DIV)

ILIM (1V/DIV)

OUT (1V/DIV)

OUT (2V/DIV)

OUT (2V/DIV)

VB (1V/DIV)

VIN (1V/DIV)

OUT (1V/DIV)

WRN (5V/DIV)

LOAD CURRENT

(200mA/DIV)

VIN (1V/DIV)

VIN (2V/DIV)

VIN (2V/DIV)

Zoom In View of Power-up

Waveform when Output

is Short-circuit

Green: Load Current; Blue: Output Voltage

Power-up Waveform

when Output is Short-circuit

200ms/div

10ms/div

LOAD CURRENT

(500mA/DIV)

LOAD CURRENT

(500mA/DIV)

VIN (1V/DIV)

WRN (5V/DIV)

OUT (1V/DIV)

WRN (5V/DIV)

VIN (1V/DIV)

OUT (1V/DIV)

VIN (2V/DIV)

OUT (2V/DIV)