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TPSM84A21

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SLVSDF7A – DECEMBER 2016 – REVISED JULY 2017

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Copyright © 2016–2017, Texas Instruments Incorporated

(1)

For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report, SPRA953.

(2)

The junction-to-ambient thermal resistance, ΘJA, applies to devices soldered directly to a 50 mm x 100 mm double-sided PCB with 2 oz.

copper and natural convection cooling. Additional airflow reduces ΘJA.

(3)

The junction-to-top board characterization parameter, ΘJT, estimates the junction temperature, TJ, of a device in a real system, using a

procedure described in JESD51-2A (section 6 and 7). TJ = ψJT * Pdis + TT; where Pdis is the power dissipated in the device and TT is

the temperature of the top of the device.

(4)

The junction-to-board characterization parameter, ψJB, estimates the junction temperature, TJ, of a device in a real system, using a

procedure described in JESD51-2A (sections 6 and 7). TJ = ψJB * Pdis + TB; where Pdis is the power dissipated in the device and TB is

the temperature of the board 1mm from the device.

6.4 Thermal Information

THERMAL METRIC(1)

TPSM84A21

UNIT

MOJ (QFM)

20 PINS

RθJA

Junction-to-ambient thermal resistance (2)

14.9

°C/W

ψJT

Junction-to-top characterization parameter (3)

2.2

°C/W

ψJB

Junction-to-board characterization parameter (4)

5.7

°C/W

(1)

The stated limit of the set-point tolerance includes the tolerance of both the internal voltage reference and the internal adjustment

resistor. The overall output voltage tolerance will be affected by the tolerance of the external RSET resistor.

(2)

Specified by design. Not production tested.

6.5 Electrical Characteristics

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

INPUT VOLTAGE (VIN)

VIN

VIN input voltage range

Over VOUT range

8

14

V

VIN_UVLO

VIN under voltage lock out

VIN increasing

7.65

7.95

V

VIN decreasing

7.4

V

VIN_HYS

VIN UVLO hysteresis

250

mV

IVIN_EN

VIN standby current

EN = 0 V

47

µA

OUTPUT VOLTAGE (VOUT)

VOUT(ADJ)

Output voltage adjust range

Over IOUT range

0.55

1.35

V

VOUT

Set-point voltage tolerance

VOUT = 1.0 V, TA = 25°C, IOUT = 0 A

-1.0%

+1.0%(1)

Temperature variation

VOUT = 1.0 V, –40°C ≤ TA ≤ 85°C, IOUT = 0 A

±0.2%(2)

Line regulation

VOUT = 1.0 V, over VIN range, IOUT = 0 A, TA = 25°C

±0.03%

Load regulation

VOUT = 1.0 V, over IOUT range, TA = 25°C

±0.1%

VOUT

Ripple

Output Voltage Ripple

20-MHz Bandwidth, peak-to-peak

8

mV

OUTPUT CURRENT

IOUT

Output current

See SOA graph for derating over temperature.

0

10

A

Overcurrent threshold

ILIM = open

15

A

ILIM = 47 kΩ

11.25

A