Datasheet

Thermal
Limit
Soft-Start
Discharge
OUT
V
OUT
FB
PG
IN
BIAS
SS
EN
Hysteresis
andDeglitch
Current
Limit
UVLO
0.44 Am
0.8V
Reference
0.9 ´ V
REF
GND
C
SS
R
1
R
2
TPS74801-Q1
www.ti.com SLVSAI4B –OCTOBER 2010–REVISED JULY 2013
BLOCK DIAGRAM
Table 1. Standard 1% Resistor Values for Programming the Output Voltage
(1)
R
1
(kΩ) R
2
(kΩ) V
OUT
(V)
Short Open 0.8
0.619 4.99 0.9
1.13 4.53 1
1.37 4.42 1.05
1.87 4.99 1.1
2.49 4.99 1.2
4.12 4.75 1.5
3.57 2.87 1.8
3.57 1.69 2.5
3.57 1.15 3.3
(1) V
OUT
= 0.8 × (1 + R
1
/ R
2
).
Table 2. Standard Capacitor Values for Programming the Soft-Start Time
(1)
C
SS
SOFT-START TIME
Open 0.1 ms
270 pF 0.5 ms
560 pF 1 ms
2.7 nF 5 ms
5.6 nF 10 ms
0.01 μF 18 ms
(1) t
SS
(s) = 0.8 × C
SS
(F) / 4.4 × 10
–7
.
DEVICE INFORMATION
Copyright © 2010–2013, Texas Instruments Incorporated Submit Documentation Feedback 5
Product Folder Links: TPS74801-Q1