Datasheet

TPS57112-Q1
SLVSAL8 –DECEMBER 2010 www.ti.com
ELECTRICAL CHARACTERISTICS
T
J
= –40°C to 150°C, VIN = 2.95 to 6 V (unless otherwise noted)
DESCRIPTION CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE (VIN PIN)
Operating input voltage 2.95 6.0 V
VIN UVLO START 2.28 2.5 V
Internal under voltage lockout threshold
VIN UVLO STOP 2.45 2.6 V
Shutdown supply current EN = 0 V, 25°C, 2.95 V ≤ VIN ≤ 6 V 5.5 15 mA
Quiescent Current - I
q
VSENSE = 0.9 V, VIN = 5 V, 25°C, RT = 400 kΩ 515 750 mA
ENABLE AND UVLO (EN PIN)
Enable threshold Rising 1.25 V
Falling 1.18
Enable threshold + 50 mV –3.2
Input current mA
Enable threshold – 50 mV –1.65
VOLTAGE REFERENCE (VSENSE PIN)
Voltage Reference 2.95 V ≤ VIN ≤ 6 V, –40°C <T
J
< 150°C 0.79 0.800 0.811 V
MOSFET
BOOT-PH = 5 V 12 30
High side switch resistance mΩ
BOOT-PH = 2.95 V 16 30
VIN = 5 V 13 30
Low side switch resistance mΩ
VIN = 2.95 V 17 30
ERROR AMPLIFIER
Input current 2 nA
Error amplifier transconductance (gm) –2 mA < I
(COMP)
< 2 mA, V
(COMP
) = 1 V 245 mmhos
Error amplifier transconductance (gm) during –2 mA < I
(COMP)
< 2 mA, V
(COMP)
= 1 V, 79 mmhos
slow start Vsense = 0.4 V
Error amplifier source/sink V
(COMP)
= 1 V, 100 mV overdrive ±20 mA
COMP to Iswitch gm 14 A/V
CURRENT LIMIT
Current limit threshold 2.9 5.3 A
THERMAL SHUTDOWN
Thermal Shutdown 168 °C
Hysteresis 20 °C
TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)
Switching frequency range using RT mode 200 2000 kHz
Switching frequency Rt = 400 kΩ 400 500 600 kHz
Switching frequency range using CLK mode 300 2000 kHz
Minimum CLK pulse width 75 ns
RT/CLK voltage R
(RT/CLK)
= 400kΩ 0.5 V
RT/CLK high threshold 1.6 2.5 V
RT/CLK low threshold 0.4 0.6 V
RT/CLK falling edge to PH rising edge delay Measure at 500 kHz with RT resistor in series 90 ns
PLL lock in time Measure at 500 kHz 42 ms
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