TPS84621

www.ti.com

SLVSAW7A – DECEMBER 2011 – REVISED APRIL 2012

ELECTRICAL CHARACTERISTICS

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

Output current

0

6

A

VIN

Input bias voltage range

4.5

14.5

V

PVIN

Input switching voltage range

V

VIN = increasing

4.0

4.5

UVLO

VIN Undervoltage lockout

V

VIN = decreasing

3.5

3.85

Output voltage adjust range

5.5

V

Set-point voltage tolerance

Temperature variation

-40°C

±0.3%

Line regulation

±0.1%

Load regulation

±0.1%

Total output voltage variation

Includes set-point, line, load, and temperature variation

92 %

91 %

89 %

PVIN = VIN = 12 V

88 %

85 %

80 %

η

Efficiency

PVIN = VIN = 5 V

95 %

93 %

91 %

89 %

85 %

83 %

Output voltage ripple

20 MHz bandwith

30

Overcurrent threshold

11

A

Recovery time

80

µs

Transient response

60

mV

over/undershoot

Inhibit High Voltage

1.30

Inhibit Control

V

Inhibit Low Voltage

–0.3

1.05

INH Input current

INH < 1.1 V

-1.15

μA

INH Hysteresis current

INH > 1.26 V

-3.4

μA

Input standby current

INH pin to AGND

2

4

µA

Good

94%

Fault

109%

PWRGD Thresholds

Power

Fault

91%

Good

Good

106%

PWRGD Low Voltage

I(PWRGD) = 2 mA

0.3

V

Switching frequency

200

250

300

kHz

Synchronization frequency

250

780

kHz

CLK High-Level Threshold

2.0

5.5

V

CLK Control

CLK Low-Level Threshold

0.8

V

CLK Duty cycle

20%

80%

Thermal shutdown

160

175

°C

Thermal Shutdown

Thermal shutdown hysteresis

10

°C

(1)

(2)

(3)

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

(4)

This control pin has an internal pullup. If this pin is left open circuit, the device operates when input power is applied. A small low-

leakage MOSFET is recommended for control. See the application section for further guidance.

Copyright © 2011–2012, Texas Instruments Incorporated

3