TPS79301, TPS79318
TPS79325, TPS79328, TPS793285
TPS79330, TPS79333, TPS793475
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SLVS348H–JULY 2001–REVISED OCTOBER 2004
FUNCTIONAL BLOCK DIAGRAMS
ADJUSTABLE VERSION
IN
OUT
59 k
UVLO
2.45V
Current
Sense
R1
R2
ILIM
SHUTDOWN
GND
EN
_
+
FB
UVLO
Thermal
Shutdown
External to
the Device
QuickStart
Bandgap
Reference
1.22V
250 kΩ
V
ref
IN
NR
FIXED VERSION
IN
OUT
UVLO
2.45V
Current
Sense
GND
EN
SHUTDOWN
+
ILIM
R1
R2
_
UVLO
Thermal
Shutdown
R2 = 40 kΩ
QuickStart
Bandgap
Reference
1.22V
250 kΩ
V
ref
NR
IN
Terminal Functions
TERMINAL
DESCRIPTION
SOT23 SOT23
WCSP
FIXED
NAME
NR
ADJ
FIXED
Connecting an external capacitor to this pin bypasses noise generated by the internal bandgap.
This improves power-supply rejection and reduces output noise.
4
4
B2
A3
Driving the enable pin (EN) high turns on the regulator. Driving this pin low puts the regulator into
shutdown mode. EN can be connected to IN if not used.
EN
3
3
FB
GND
IN
5
2
1
6
N/A
2
N/A
A1
This terminal is the feedback input voltage for the adjustable device.
Regulator ground
1
C3
C1
Unregulated input to the device.
OUT
5
Output of the regulator.
5
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