Datasheet

TPS65950
www.ti.com SWCS032E–OCTOBER 2008–REVISED JANUARY 2011
4.1.13 VAUX4 LDO Regulator
The VAUX4 GP LDO regulator powers the auxiliary devices. The VAUX4 regulator has an independent
supply input pin and can be preregulated by an external voltage. Table 4-15 lists the characteristics of the
regulator.
Table 4-15. VAUX4 LDO Regulator Characteristics
Parameter Test Conditions Min Typ Max Unit
Output Load Conditions
Filtering capacitor Connected from VAUX4.OUT to analog ground 0.3 1 2.7 μF
Filtering capacitor ESR 20 600 mΩ
Electrical Characteristics
V
IN
Input voltage 2.7 3.6 4.5 V
0.672 0.7 0.728
0.97 1.0 1.03
1.164 1.2 1.236
1.261 1.3 1.339
1.455 1.5 1.545
1.746 1.8 1.854
V
OUT
Output voltage On mode and low-power mode 1.795 1.85 1.906 V
2.425 2.5 2.575
2.522 2.6 2.678
2.716 2.8 2.884
2.765 2.85 2.936
2.91 3.0 3.09
3.056 3.15 3.245
On mode 100
I
OUT
Rated output current mA
Low-power mode 5
dc load regulation On mode: I
OUT
= I
OUTmax
to 0 20 mV
dc line regulation On mode, V
IN
= V
INmin
to V
INmax
at I
OUT
= I
OUTmax
3 mV
Turn-on time I
OUT
= 0, C
L
= 1 μF (within 10% of V
OUT
) 100 μs
Wake-up time Full load capability 10 μs
f < 10 kHz 50
10 kHz < f < 100 kHz 40
Ripple rejection dB
f = 1 MHz 30
V
IN
= V
OUT
+ 1 V, I
O
= I
Max
On mode, I
OUT
= 0 70
On mode, I
OUT
= I
OUTmax
170
Ground current Low-power mode, I
OUT
= 0 17 μA
Low-power mode, I
OUT
= 5 mA 20
Off mode at 55°C 1
V
DO
Dropout voltage On mode, I
OUT
= I
OUTmax
250 mV
I
Load
: I
Min
– I
Max
Transient load regulation –40 40 mV
Slew: 40 mA/μs
V
IN
drops 500 mV
Transient line regulation 10 mV
Slew: 40 mV/μs
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