Datasheet
TPS65708
www.ti.com
SLVSAE1A –OCTOBER 2010– REVISED FEBRUARY 2011
RECOMMENDED OPERATING CONDITIONS
Over operating free-air temperature range (unless otherwise noted).
MIN NOM MAX UNIT
V
IN1/2
Input voltage range for step-down converter DCDC1and DCDC2 3.6 6 V
V
OUTDCDC1/2
Output voltage range for DCDC1 and DCDC2 step-down converter 0.8 3.3 V
I
OUTDCDC1
DC output current at L1 or L2 400 mA
L Inductor at L1 or L2
(1)
1 1.5 2.2 µH
V
INLDO1
Input voltage range for LDO1 1.7 6 V
V
LDO
Output voltage range for LDO1 and LDO2 0.8 3.3 V
V
INLDO2
Input voltage range for LDO2 1.7 6 V
I
LDO
Output current at LDO1 or LDO2 200 mA
C
INDCDC1/2
Input capacitor at V
IN1
and V
IN2
4.7 µF
C
OUTDCDC1/2
Output capacitor at V
OUT1
, V
OUT2
4.7 10 22 µF
C
OUTLDO1/2
Output capacitor at V
LDO1
, V
LDO2
2.2 µF
T
A
Operating ambient temperature –40 85 °C
T
J
Operating junction temperature –40 125 °C
(1) To support a typical inductor value of 1.5µH, the minimum inductance can go as low as 1.0µH. It is not recommended to use a 1µH
labeled inductor as the inductance will drop significantly below 1µH in operation due to initial tolerances and saturation.
ELECTRICAL CHARACTERISTICS
Unless otherwise noted: VIN1 = VIN2 = VCC = 5V, L = 1.5µH, C
OUTDCDCx
= 10µF, C
OUTLDOx
= 2.2µF, T
A
= –40°C to 85°C.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
DCDC1, DCDC2, LDO1 and LDO2 enabled,
I
OUT
= 0 mA, MODE = 0; (PFM mode) 140 200 μA
ISINK in standby for PWM = 0
DCDC1, DCDC2, LDO1 and LDO2 enabled,
I
OUT
= 0 mA, MODE = 1 ; (PWM mode)
Operating quiescent current DCDCx and 4 mA
I
Q
ISINK in standby if PWM = 0;
LDOx
Not including inductor losses
DCDC1, DCDC2, LDO1 and LDO2 enabled,
I
OUT
= 0 mA, MODE = 0; (PFM mode) ;
170 μA
ISINK in standby PWM = 0;
During power-up sequencing
DCDCx, LDOx and ISINK disabled;
I
SD
Shutdown Current 6 15 μA
VCC < 1.8V
DIGITAL PINS ( MODE)
V
IH
High Level Input Voltage for MODE 1.2 V
CC
V
V
IL
Low Level Input Voltage for MODE 0 0.4 V
I
lkg
Input Leakage Current MODE tied to GND or VIN1 / VIN2 0.01 0.1 μA
UNDERVOLTAGE LOCKOUT (UVLO), SENSED AT PIN VCC
Internal undervoltage lockout threshold VCC, VIN1, VIN2 rising 3.5 3.6 3.7 V
UVLO
Internal undervoltage lockout threshold
VCC, VIN1, VIN2 falling 130 mV
hysteresis
STEP-DOWN CONVERTERS
VIN1 Input voltage for DCDC1 3.5 6 V
VIN2 Input voltage for DCDC2 3.5 6 V
POWER SWITCH
High side MOSFET on-resistance VIN1 / VIN2 = 3.6V 250 400 mΩ
R
DS(on)
Low side MOSFET on-resistance VIN1 / VIN2 = 3.6V 150 300 mΩ
I
LIMF
Forward current limit 3.6V ≤ VIN1 / VIN2 ≤ 6V 650 820 1050 mA
I
O
DC output current VIN1 / VIN2 > 3.5V , L = 1.5µH 400 mA
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