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TPSM84A21

SLVSDF7A – DECEMBER 2016 – REVISED JULY 2017

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Copyright © 2016–2017, Texas Instruments Incorporated

Electrical Characteristics (continued)

Over –40°C to +85°C free-air temperature range, VIN = 12 V, VOUT = 1.0 V, IOUT = IOUT max, FSW = 4 MHz,

External CIN = 2 × 22 µF 25 V 1210 ceramic plus 1 × 100 µF electrolytic (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX UNIT

(3)

Internal to the device, 66.1 µF (nominal) ceramic input capacitance is present. This device does not require additional input capacitance.

If adding additional input capacitance, locate the capacitors close to the device.

(4)

Internal to the device, 185 µF (nominal) ceramic output capacitance is present. This device does not require additional output

capacitance to operate. Adding additional output capacitance near the load improves the response of the device to load transients.

(5)

The maximum output capacitance listed in the table is the maximum amount that has been tested and validated for proper start-up,

stability, and transient response. It may be possible to operate with additional output capacitance, however, additional validation is

required.

PERFORMANCE

ƞ

Efficiency(2)

VIN = 12 V, IOUT = 5 A

VOUT = 0.8 V, VG = open

79.8%

VOUT = 0.8 V, VG = 5 V

82.5%

VOUT = 1.0 V, VG = open

82.6%

VOUT = 1.0 V, VG = 5 V

84.9%

VOUT = 1.2 V, VG = open

84.5%

VOUT = 1.2 V, VG = 5 V

86.5%

Transient Response(2)

1 A/µs load step,

25% to 75% IOUT(max),

COUT= 0 µF

VOUT over/undershoot

10

mV

Recovery Time

10

µs

5 A/µs load step,

25% to 75% IOUT(max),

COUT= 0 µF

VOUT over/undershoot

25

mV

Recovery Time

10

µs

SOFT START

TSS

Internal soft start time(2)

4.1

ms

INTERNAL REGULATOR (VG)

VVG

VG pin output voltage

4.4

4.8

5.0

V

ENABLE AND UNDER-VOLTAGE LOCK-OUT (EN/UVLO)

VEN

EN threshold range

1.17

1.23

1.27

V

IEN

Input current

EN threshold + 50 mV

–4

µA

Hysteresis current

EN threshold – 50 mV

–1

µA

POWER GOOD (PGOOD)

VPGOOD

PGOOD Thresholds (2)

VVOUT falling (Fault)

89%

VVOUT rising (Good)

95%

VVOUT rising (Fault)

109%

VVOUT falling (Good)

104%

Minimum VIN for valid

PGOOD(2)

VPGOOD ≤ 0.5 V at 100 µA

1.2

2.75

V

PGOOD Low Voltage

IPGOOD = 1.7 mA

0.25

0.3

V

THERMAL SHUTDOWN

Thermal shutdown threshold

135

°C

Thermal shutdown hysteresis

20

°C

CAPACITANCE

CIN

External Input Capacitance

Ceramic type

0(3)

44

µF

Non-ceramic type

0(3)

100

µF

COUT

External Output Capacitance

Ceramic type

0(4)

1000(5)

µF

Non-ceramic type

0(4)

2200(5)

µF

Equivalent series resistance (ESR)

35

mΩ