TPS65921 datasheet(10/58 Pages) TI1

Part #	TPS65921

Description	Power Management and USB Single Chip

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TPS65921

SWCS048F – MARCH 2010 – REVISED MARCH 2012

www.ti.com

VIO DCDC CONVERTER

PARAMETER

COMMENTS

MIN

TYP

MAX

UNIT

Input voltage range

2.7

3.6

4.5

V

1.8

Output voltage(1)

V

1.85

DC accuracy only

–3%

3%

Including all variations (line and load

Output accuracy

regulations, line and load transients,

–4%

4%

temperature, and process)

Switching frequency

3.2

MHz

IO = 10 mA, sleep

85%

Conversion efficiency(2)

100 mA < IO < 400 mA

85%

400 mA < IO < 600 mA

80%

On mode

700

mA

Output current

Sleep mode

10

mA

Off at 30°C

1

Ground current (IQ)

Sleep, unloaded

30

50

µA

Active, unloaded, not switching

300

Load regulation

0 < IO < IMAX

20

mV

Line regulation

10

mV

IO = 10 mA to (IMAX/3) + 10 mA,

Transient load regulation

–65

50

mV

maximum slew rate is IMAX/3/100 ns

300 mVPP ac input, 10-μs rise and fall

Transient line regulation

10

mV

time

Start-up time

0.25

1

ms

Recovery time

From sleep to on with constant load

< 10

100

µs

Slew rate (rising or falling)

4

8

16

mV/µs

Active (PWM and PSM)

–10

10

mV

Output ripple

Sleep (PFM)

–2%

2%

Current limit for PWM/PSM mode

switch. PSM is below this limit, and

Active mode

150

200

mA

PWM is above this limit.

Overshoot

Softstart

5%

Output pulldown resistance

In Off mode

500

700

Ω

(1)

This voltage is tuned according to the platform and transient requirements.

(2)

VBAT = 3.8 V, VIO = 1.8 V, Fs = 3.2 MHz, L = 1

μH, LDCR = 100 mΩ, C = 10 μF, ESR = 10 mΩ

10

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