Datasheet

DEVICE INFORMATION
FUNCTIONAL BLOCK DIAGRAMS
Thermal
Shutdown
UVLO
Current
Limit
3.3MW
Overshoot
Detect
500kW
1.208V
Bandgap
IN
EN
FB
OUT
GND
400W
Thermal
Shutdown
UVLO
Current
Limit
2 Am
Overshoot
Detect
500kW
Quickstart
1.208V
Bandgap
(1)
IN
EN
NR
OUT
GND
400W
NOTE(1): Fixedvoltageversionsbetween1.0Vto1.2Vhavea1.0Vbandgapcircuit
insteadofa1.208Vbandgapcircuit.
PIN CONFIGURATIONS
TPS734xxDDC
TSOT23-5
(TOPVIEW)
OUT
NR
IN
GND
EN
1
2
3
5
4
TPS73401DDC
TSOT23-5
(TOPVIEW)
OUT
FB
IN
GND
EN
1
2
3
5
4
TPS734xxDRV
2mmx2mmSON-6
(TOPVIEW)
IN
N/C
EN
6
5
4
OUT
NR
GND
1
2
3
GND
TPS73401DRV
2mmx2mmSON-6
(TOPVIEW)
IN
N/C
EN
6
5
4
OUT
FB
GND
1
2
3
GND
TPS734xx
SBVS089F – DECEMBER 2007 – REVISED FEBRUARY 2009 ........................................................................................................................................ www.ti.com
Figure 1. Fixed Voltage Versions Figure 2. Adjustable Voltage Versions
PIN DESCRIPTIONS
TPS734xx
NAME DDC DRV DRB DESCRIPTION
IN 1 6 8 Input supply.
GND 2 3, Pad 4 Ground. The pad must be tied to GND.
Driving the enable pin (EN) high turns on the regulator. Driving this pin low puts the
EN 3 4 5
regulator into shutdown mode. EN can be connected to IN if not used.
Fixed voltage versions only; connecting an external capacitor to this pin bypasses noise
NR 4 2 3 generated by the internal bandgap. This allows output noise to be reduced to very low
levels.
Adjustable version only; this is the input to the control loop error amplifier, and is used to set
FB 4 2 3
the output voltage of the device.
Output of the regulator. A small capacitor (total typical capacitance ≥ 2.0 µ F ceramic) is
OUT 5 1 1
needed from this pin to ground to assure stability.
N/C — 5 2, 6, 7 Not internally connected. This pin must either be left open, or tied to GND.
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