Datasheet

FUNCTIONAL BLOCK DIAGRAM
Thermal
Shutdown
10kW
Current
Limit
Bandgap
IN
EN
OUT
EPROM
MUX
V
SET
/FB
(1)
LOGIC
Active
Pull-
Down
GND
PIN CONFIGURATIONS
TPS781DRV
2mmx2mmSON-6
(TOPVIEW)
IN
GND
EN
6
5
4
OUT
N/C
V FB/
SET
1
2
3
Thermal
Pad
(1)
TPS781DDC
TSOT23-5
(TOPVIEW)
OUT
V /FB
SET
IN
GND
EN
1
2
3
5
4
TPS781 Series
SBVS102B – MARCH 2008 – REVISED MAY 2008 ........................................................................................................................................................... www.ti.com
(1) Feedback pin (FB) for adjustable versions; V
SET
for fixed voltage versions.
(1) It is recommended that the SON package thermal pad be connected to ground.
Table 1. TERMINAL FUNCTIONS
TERMINAL
NAME DRV DDC DESCRIPTION
Regulated output voltage pin. A small (1 µ F) ceramic capacitor is needed from this pin to
OUT 1 5 ground to assure stability. See the Input and Output Capacitor Requirements in the
Application Information section for more details.
N/C 2 — Not connected.
Feedback pin (FB) for adjustable versions; V
SET
for fixed voltage versions. Driving the select
V
SET
/FB 3 4 pin (V
SET
) below 0.4V selects preset output voltage high. Driving the V
SET
pin over 1.2V
selects preset output voltage low.
Driving the enable pin (EN) over 1.2V turns on the regulator. Driving this pin below 0.4V puts
EN 4 3
the regulator into shutdown mode, reducing operating current to 18nA typical.
GND 5 2 Ground pin.
Input pin. A small capacitor is needed from this pin to ground to assure stability. Typical input
IN 6 1 capacitor = 1.0 µ F. Both input and output capacitor grounds should be tied back to the IC
ground with no significant impedance between them.
Thermal pad Thermal pad — It is recommended that the SON package thermal pad be connected to ground.
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