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TPS79301, TPS79318
TPS79325, TPS79328, TPS793285
TPS79330, TPS79333, TPS793475
SLVS348H – JULY 2001 – REVISED OCTOBER 2004
FUNCTIONAL BLOCK DIAGRAMS
ADJUSTABLE VERSION
IN
UVLO
2.45V
Current
Sense
ILIM
_
59 k
OUT
GND
EN
UVLO
Thermal
Shutdown
Bandgap
Reference
1.22V
SHUTDOWN
+
FB
R1
R2
QuickStart
250 kΩ
V
ref
External to
the Device
NR
IN
FIXED VERSION
IN
UVLO
2.45V
GND
EN
UVLO
R2
Thermal
Shutdown
QuickStart
Bandgap
Reference
1.22V
250 kΩ
V
ref
Current
Sense
ILIM
_
SHUTDOWN
R1
+
OUT
R2 = 40 kΩ
IN
NR
Terminal Functions
TERMINAL
NAME
NR
EN
FB
GND
IN
OUT
SOT23
ADJ
4
3
5
2
1
6
SOT23
FIXED
4
3
N/A
2
1
5
WCSP
FIXED
B2
A3
N/A
A1
C3
C1
DESCRIPTION
Connecting an external capacitor to this pin bypasses noise generated by the internal bandgap.
This improves power-supply rejection and reduces output noise.
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.
This terminal is the feedback input voltage for the adjustable device.
Regulator ground
Unregulated input to the device.
Output of the regulator.
5
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