Datasheet

Thermal
Limit
Soft-Start
Discharge
OUT
V
OUT
FB
PG
IN
BIAS
SS
EN
Hysteresis
andDe-Glitch
Current
Limit
UVLO
0.73 Am
0.8V
Reference
0.9 ´ V
REF
GND
C
SS
R
1
R
2
V =0.8x( )
OUT
1+
R
1
R
2
TPS74401-EP
www.ti.com SBVS122B –MARCH 2010–REVISED SEPTEMBER 2010
BLOCK DIAGRAM
Table 2. 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 3. Standard Capacitor Values for Programming the Soft-Start Time
(1)
C
SS
SOFT-START TIME
Open 0.1 ms
470 pF 0.5 ms
1000 pF 1 ms
4700 pF 5 ms
0.01 mF 10 ms
0.015 mF 16 ms
(1) t
SS
(s) = 0.8 × C
SS
(F)/7.3 × 10
–7
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