Datasheet

TPS5432
SLVSB89A –MARCH 2012–REVISED OCTOBER 2012 www.ti.com
ELECTRICAL CHARACTERISTICS
The Electrical Ratings specified in this section apply to all specifications in this document, unless otherwise noted. These
specifications are interpreted as conditions that do not degrade the parametric or functional specifications of the device for the
life of the product containing it. Test Conditions: T
J
= –40°C to 125°C, VIN = 2.95 to 6V, (unless otherwise noted)
PARAMETERS CONDITIONS MIN TYP MAX UNIT
SUPPLY VOLTAGE
Vin 2.95 6 V
Iq shutdown EN = 0V, 25°C, 2.95 V < Vin < 6 V 2 5 µA
Iq operating No load, Vin = 5 V, no switching, Vsense = 1 V, 25°C 360 575 µA
VIN UVLO
Input UVLO threshold Rising Vin 2.6 2.8 V
Input UVLO hysteresis 0.2 V
ENABLE
Enable threshold Rising 0.984 1.23 1.47 V
Enable threshold Falling 0.952 1.19
Enable threshold +50 mv –4.6
Input current µA
Enable threshold –50 mv –1.2
VOLTAGE REFERENCE
2.95 V < Vin < 6 V, T
J
= 25°C 0.792 0.808 0.824 V
Reference
2.95 V < Vin < 6 V, –40°C < T
J
< +125°C 0.784 0.808 0.832 V
MOSFET
H.S switch resistance BOOT-PH = 5 V, T
J
= 25°C 62 86 mΩ
L.S switch resistance Vin = 5 V, T
J
= 25°C 73 103 mΩ
H.S switch resistance BOOT-PH = 2.95 V, T
J
= 25°C 88 114 mΩ
L.S switch resistance Vin = 2.95 V, T
J
= 25°C 94 128 mΩ
ERROR AMPLIFIER
Error amp transconductance (gm) –2 µA < ICOMP < 2 µA, V(COMP) = 1 V 245 µmho
Error amp transconductance (gm) during soft start –2 µA < ICOMP < 2 µA,V(COMP) = 1 V, Vsense = 0.3 V 70 µmho
Error amp source/sink V(COMP) = 1 V, 100 mV overdrive ±20 µA
COMP to Iph gm Vin = 5 V, Iph1 = (0.5 or 1A) and Iph2 = 3 A 15 A/V
FREQUENCY FOLDBACK vs. VSENSE
Vsense voltage for Fs foldback 50% frequency 0.4 V
Vsense voltage for Fs foldback 25% frequency 0.2 V
CURRENT LIMIT
I max High side FET Vin = 3.3 V, duty cycle = 100% 3.8 5.7 7 A
I max Low side FET 0.8 1.8 A
THERMAL SHUTDOWN
Thermal Shutdown 155 170 C
OT Hysteresis 15 C
SWITCHING FREQUENCY
Switching frequency 520 700 880 kHz
PH (PH PIN)
Minimum on time Vin = 5 V; Measured at 50% points on PH, Iout = 3 A 120 150 ns
Minimum off time Prior to skipping off pulses, BOOT-PH = 2.95 V, Iout = 3 A 60 ns
Rise/Fall time Vin = 5 V, Io = 0 A 1.5 V/ns
Rise/Fall time Vin = 5 V, Io = 3 A 1.5 V/ns
BOOT
Boot recharge FET resistance Vin = 5 V 15 Ω
Boot UVLO Vin = 2.95 V 2.1 V
SLOW START TIME
Charge current Vss = 0.4 V 2 μA
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