LM27761
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ZHCSEO7C –OCTOBER 2015–REVISED JANUARY 2017
7 Detailed Description
7.1 Overview
The LM27761 regulated charge-pump voltage converter inverts a positive voltage in the range of 2.7 V to 5.5 V
to a negative voltage in the range of –1.5 V to –5 V. The negative LDO (low drop-out regulator), at the output of
the charge-pump voltage converter, allows the device to provide a very low noise output, low output-voltage
ripple, high PSRR, and low line and load transient responses. The output is externally configurable with gain-
setting resistors. The LM27761 uses four low-cost capacitors to deliver up to 250 mA of output current.
7.2 Functional Block Diagram
VIN
Current Limit
C1+
Switch Array Switch
2-MHz
Oscillator
Drivers
C1-
CPOUT
EN
GND
Reference
LPF
VOUT
Negative
Bandgap
LPF
VFB
LDO
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