TPS74801-Q1
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SLVSAI4A –OCTOBER 2010–REVISED FEBRUARY 2011
BLOCK DIAGRAM
OUT
VOUT
Current
Limit
IN
BIAS
UVLO
Thermal
Limit
0.44mA
R1
SS
CSS
Soft-Start
Discharge
0.8V
Reference
FB
PG
Hysteresis
and Deglitch
R2
EN
0.9 ´ VREF
GND
Table 1. Standard 1% Resistor Values for Programming the Output Voltage(1)
R1 (kΩ)
Short
0.619
1.13
R2 (kΩ)
Open
4.99
4.53
4.42
4.99
4.99
4.75
2.87
1.69
1.15
VOUT (V)
0.8
0.9
1.0
1.37
1.05
1.1
1.87
2.49
1.2
4.12
1.5
3.57
1.8
3.57
2.5
3.57
3.3
(1) VOUT = 0.8 × (1 + R1/R2).
Table 2. Standard Capacitor Values for Programming the Soft-Start Time(1)
CSS
SOFT-START TIME
Open
270pF
560pF
2.7nF
5.6nF
0.01μF
0.1ms
0.5ms
1ms
5ms
10ms
18ms
(1) tSS(s) = 0.8 × CSS(F)/4.4 × 10–7
.
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