Datasheet

TPS57112-Q1
www.ti.com SLVSAL8 –DECEMBER 2010
ELECTRICAL CHARACTERISTICS (continued)
T
J
= –40°C to 150°C, VIN = 2.95 to 6 V (unless otherwise noted)
DESCRIPTION CONDITIONS MIN TYP MAX UNIT
PH (PH PIN)
Minimum On time Measured at 50% points on PH, I
OUT
= 2 A 75
ns
Measured at 50% points on PH, VIN = 6 V, 120
I
OUT
= 0 A
Minimum Off time Prior to skipping off pulses, BOOT-PH = 2.95 V, 60 ns
I
OUT
= 2A
Rise Time 2.25
VIN = 6 V, 2 A V/ns
Fall Time 2
BOOT (BOOT PIN)
BOOT Charge Resistance VIN = 5 V 16 Ω
BOOT-PH UVLO VIN = 2.95 V 2.1 V
SLOW START AND TRACKING (SS/TR PIN)
Charge Current V
(SS/TR)
= 0.4 V 2 mA
SS/TR to VSENSE matching V
(SS/TR)
= 0.4 V 54 mV
SS/TR to reference crossover 98% normal 1.1 V
SS/TR discharge voltage (Overload) VSENSE = 0 V 60 mV
SS/TR discharge current (Overload) VSENSE = 0 V, V
(SS/TR)
= 0.4 V 350 µA
SS discharge current (UVLO, EN, Thermal VIN = 5 V, V(SS) = 0.5 V 1.9 mA
fault)
POWER GOOD (PWRGD PIN)
VSENSE falling (Fault) 91 % Vref
VSENSE rising (Good) 93 % Vref
VSENSE threshold
VSENSE rising (Fault) 109 % Vref
VSENSE falling (Good) 107 % Vref
Hysteresis VSENSE falling 2 % Vref
Output high leakage VSENSE = VREF, V
(PWRGD)
= 5.5 V 7 nA
On resistance 56 100 Ω
Output low I
(PWRGD)
= 3 mA 0.3 V
Minimum VIN for valid output V
(PWRGD)
< 0.5 V at 100 mA 0.650 1.5 V
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