Datasheet

t (s) =
SS
V C
I
REF SS
SS
×
0.8V C (F)
0.44 A
SS
m
×
=
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
(1) where t
SS
(s) = soft-start time in seconds.
TPS74701
www.ti.com SBVS099F –NOVEMBER 2007–REVISED NOVEMBER 2010
FUNCTIONAL 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 1.0
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 0.1ms
270pF 0.5ms
560pF 1ms
2.7nF 5ms
5.6nF 10ms
0.01mF 18ms
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