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FUNCTIONAL BLOCK DIAGRAM
TPS72325
OUT
IN
EN
CurrentLimit
/Thermal
Protection
NR
V
REF
1.186V
5pF
R1
R1+R2=97kW
R2
100kW
GND
TPS72301
OUT
IN
EN
CurrentLimit
/Thermal
Protection
FB
V
REF
1.186V
5pF
R1
R1+R2 100k@ W
R2
100kW
GND
TPS72301
TPS72325
SLVS346B – SEPTEMBER 2003 – REVISED JULY 2007
TERMINAL FUNCTIONS
TERMINAL
NAME NO. DESCRIPTION
GND 1 Ground
IN 2 Input supply
Bipolar enable pin. Driving this pin above the positive enable threshold or below the negative enable
EN 3 threshold turns on the regulator. Driving this pin below the positive disable threshold and above the
negative disable threshold puts the regulator into shutdown mode.
Fixed voltage versions only. Connecting an external capacitor between this pin and ground, bypasses
NR 4 noise generated by the internal bandgap. This configuration allows output noise to be reduced to very
low levels.
Adjustable voltage version only. This pin is the input to the control loop error amplifier. It is used to set
FB 4
the output voltage of the device.
Regulated output voltage. A small 2.2 μ F ceramic capacitor is needed from this pin to GND to ensure
OUT 5
stability.
4
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