Datasheet

TPS65930/TPS65920
SWCS037G–MAY 2008– REVISED APRIL 2011 www.ti.com
4.1.2 VDD2 dc-dc Regulator
4.1.2.1 VDD2 dc-dc Regulator Characteristics
The VDD2 dc-dc regulator is a programmable output stepdown dc-dc converter with an internal field effect
transistor (FET). Like the VDD1 regulator, the VDD2 regulator can be placed in sleep or power-down
mode and is SmartReflex-compatible. The VDD2 regulator differs from VDD1 in its current load capability.
Table 4-4 describes the regulator characteristics.
Table 4-4. VDD2 dc-dc Regulator Characteristics
Parameter Comments Min Typ Max Unit
Input voltage range 2.7 3.6 4.5 V
Output voltage 0.6 1 1.5 V
Output voltage step Covering the 0.6-V to 1.45-V range, 12.5 mV
1.5 V is a single programmable value
Output accuracy
(1)
0.6 V to < 0.8 V –6% 6%
0.8 V to 1.5 V –4% 4%
Switching frequency 3.2 MHz
I
O
= 10 mA, sleep 82%
Conversion efficiency
(2)
, Figure 4-4 in active mode
100 mA < I
O
< 300 mA 85%
300 mA < I
O
< 500 mA 80%
Active mode 600 mA
Output current
Sleep mode 10 mA
Ground current (I
Q
) Off at 30°C 1 μA
Sleep, unloaded 50
Active, unloaded, not switching 300
Short-circuit current V
IN
= V
Max
1.2 A
Load regulation 0 < I
O
< I
Max
20 mV
I
O
= 10 mA to (I
Max
/2) + 10 mA,
Transient load regulation
(3)
–65 50 mV
Maximum slew rate is I
Max
/2/100 ns
Line regulation 10 mV
Transient line regulation 300 mV
PP
ac input, 10-μs rise and fall 10 mV
time
Output shunt resistor (internal pulldown) 500 700 Ω
Start-up time 0.25 1 ms
Recovery time From sleep mode to on mode with 25 100 μs
constant load
Slew rate (rising or falling)
(4)
4 8 16 mV/μs
Value 0.7 1 1.3 μH
External coil DCR 0.1 Ω
Saturation current 900 mA
Value 8 10 12 μF
External capacitor
(5)
ESR at switching frequency 0 20 mΩ
(1) Accuracy includes all variations (line and load regulations, line and load transients, temperature, and process)
(2) VBAT = 3.8 V, VDD2 = 1.3 V, Fs = 3.2 MHz, L = 1 μH, L
DCR
= 100 mΩ, C = 10 μF, ESR = 10 mΩ
(3) Output voltage needs to discharge the load current completely and settle to its final value within 100 μs.
(4) Load current varies proportionally with the output voltage. The slew rate is for both increasing and decreasing voltages and the
maximum load current is 600 mA.
(5) Under current load condition step:
Imax/2 (300 mA) in 100 ns with a ±20% external capacitor accuracy or
Imax/3 (200 mA) in 100 ns with a ±50% external capacitor accuracy
32 Power Module Copyright © 2008–2011, Texas Instruments Incorporated
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