TPS5432

SLVSB89 – MARCH 2012

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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

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

0.792

0.808

0.824

V

Reference

0.784

0.808

0.832

V

MOSFET

H.S switch resistance

62

86

m

Ω

L.S switch resistance

73

96

m

Ω

H.S switch resistance

88

114

m

Ω

L.S switch resistance

94

126

m

Ω

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

1

2

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

4

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