MP2671 – CHARGE SYSTEM PROTECTION CIRCUIT
MP2671 Rev. 0.9 www.MonolithicPower.com 4
2/23/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
= 5V, R
ILM
= 25kΩ, C
IN
= 1uF, R
VB
= 200kΩ, T
A
= +25ºC, unless otherwise noted.
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)