Datasheet
ELECTRICAL CHARACTERISTICS
TPS650240 , , TPS650241
TPS650242 , TPS650243
TPS650244 , TPS650245
SLVS774B – JUNE 2007 – REVISED JULY 2009 ..............................................................................................................................................................
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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
VINDCDC2
Input voltage range 2.5 6.0 V
I
O
Maximum output current for V
O
= 2.5V 800 mA
TPS650240, TPS650242 and
TPS650245
I
O
Maximum output current for TPS650241 V
O
= 2.5V 1000 mA
and TPS650243
I
O
Maximum output current for TPS650244 V
O
= 2.5V 1600 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
= 6.0V 7 10 µ A
I
LIMF
Forward current limit (P- and N-channel) 2.5V < VINDCDC2 < 6.0V 1.05 1.16 1.29 A
for TPS650240, TPS650242 and
TPS650245
I
LIMF
Forward current limit (P- and N-channel) 2.5V < VINDCDC2 < 6.0V 1.22 1.35 1.50 A
for TPS650241 and TPS650243
I
LIMF
Forward current limit (P- and N-channel) 2.5V < VINDCDC2 < 6.0V 1.75 1.97 2.15 A
for TPS650244
f
S
Oscillator frequency 1.95 2.25 2.55 MHz
VDCDC2 Fixed output voltage 1.8V VINDCDC2 = 2.5V to 6.0V; 0 mA ≤ I
O
≤ – 2% 2%
MODE = 0 (PWM/PFM) 1.6A
2.5V VINDCDC2 = 3.0V to 6.0V; 0 mA ≤ I
O
≤ – 2% 2%
1.6A
Fixed output voltage 1.8V VINDCDC2 = 2.5V to 6.0V; 0 mA ≤ I
O
≤ – 2% 2%
MODE = 1 (PWM) 1.6A
2.5V VINDCDC2 = 3.0V to 6.0V; 0 mA ≤ I
O
≤ – 1% 1%
1.6A
Adjustable output voltage with resistor VINDCDC2 = VDCDC2 + 0.5V (min 2.5V) – 2% 2%
divider at DEFDCDC2 MODE = 0 to 6.0V; 0mA ≤ I
O
≤ 1.6A
(PWM)
Adjustable output voltage with resistor VINDCDC2 = VDCDC2 + 0.5V (min 2.5V) – 1% 1%
divider at DEFDCDC2; MODE = 1 to 6.0V; 0mA ≤ I
O
≤ 1.6A
(PWM)
Line regulation VINDCDC2 = VDCDC2 + 0.3 V (min. 2.5 0.0 %/V
V) to 6.0V; I
O
= 10mA
Load regulation I
O
= 10mA to 1.6A 0.25 %/A
T
SS
Soft start ramp time VDCDC2 ramping from 5% to 95% of 750 µ s
target value
R(L2) Internal resistance from L2 to GND 1 M Ω
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