Datasheet

ELECTRICAL CHARACTERISTICS
TPS650250
SLVS843 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
VINDCDC1 = VINDCDC2 = VINDCDC3 = VCC = VINLDO = 3.6V, T
A
= – 40 ° C to 85 ° C, typical values are at T
A
= 25 ° C
(unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VDCDC2 STEP-DOWN CONVERTER
V
I
Input voltage range, VINDCDC2 2.5 6 V
I
O
Maximum output current V
O
= 2.5V 800 mA
I
SD
Shutdown supply current in VINDCDC2 EN_DCDC2 = GND 0.1 1 µ A
R
DS(on)
P-channel MOSFET on-resistance VINDCDC2 = V
GS
= 3.6V 140 300 m Ω
I
LP
P-channel leakage current VINDCDC2 = 6.0V 2 µ A
R
DS(on)
N-channel MOSFET on-resistance VINDCDC2 = VGS = 3.6V 150 297 m Ω
I
LN
N-channel leakage current V
DS
= 6V 7 10 µ A
I
LIMF
Forward current limit (P- and N-channel) 2.5V < VINDCDC2 < 6V 1.05 1.16 1.29 A
f
S
Oscillator frequency 1.95 2.25 2.55 MHz
1.8V VINDCDC2 = 2.5V to 6V; 0 mA ≤ I
O
≤ 1.6A – 2% 2%
Fixed output voltage
MODE = 0 (PWM/PFM)
2.5V VINDCDC2 = 3V to 6V; 0 mA ≤ I
O
≤ 1.6A – 2% 2%
1.8V VINDCDC2 = 2.5V to 6V; 0 mA ≤ I
O
≤ 1.6A – 2% 2%
Fixed output voltage
MODE = 1 (PWM)
2.5V VINDCDC2 = 3V to 6V; 0 mA ≤ I
O
≤ 1.6A – 1% 1%
VDCDC2
Adjustable output voltage with resistor
VINDCDC2 = VDCDC2 + 0.5V (min 2.5V)
divider at DEFDCDC2 MODE = 0 – 2% 2%
to 6V; 0mA ≤ I
O
≤ 1.6A
(PWM)
Adjustable output voltage with resistor
VINDCDC2 = VDCDC2 + 0.5V (min 2.5V)
divider at DEFDCDC2; MODE = 1 – 1% 1%
to 6V; 0mA ≤ I
O
≤ 1.6A
(PWM)
VINDCDC2 = VDCDC2 + 0.3 V (min. 2.5
Line regulation 0.0 %/V
V) to 6V; I
O
= 10mA
Load regulation I
O
= 10mA to 1.6A 0.25 %/A
VDCDC2 ramping from 5% to 95% of
t
SS
Soft start ramp time 750 µ s
target value
R(L2) Internal resistance from L2 to GND 1 M Ω
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