TPS65921 datasheet(8/58 Pages) TI1

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TPS65921

SWCS048F – MARCH 2010 – REVISED MARCH 2012

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VDD1 DCDC CONVERTER

PARAMETER

COMMENTS

MIN

TYP

MAX

UNIT

Input voltage range

2.7

3.6

4.5

Output voltage

0.6

1.45

Output voltage step

0.6 to 1.45 V

12.5

Output accuracy(1)

0.6 to < 0.8 V

–6%

0.8 to 1.45 V

–5%

Switching frequency

3.2

MHz

IO = 10 mA, sleep

82%

100 mA < IO < 400 mA

85%

Conversion efficiency(2)

400 mA < IO < 600 mA

80%

600 mA < IO < 800 mA

75%

Active mode

1.2

Output voltage 0.6 V to 1.45 V

for TPS65921B/TPS65921B1

Output current

Active mode

1.4

Output Voltage 1.2 V to 1.45 V

for TPS65921B1

Sleep mode

Off at 30°C

Ground current (IQ)

Sleep, unloaded

µA

Active, unloaded, not switching

300

Short-circuit current

VIN = VMAX

2.2

Load regulation

0 < IO < IMAX

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

Transient load regulation at 1.2 A(3)

–65

maximum slew rate is IMAX/3/100 ns

Line regulation

300 mVPP ac input, 10-μs rise and fall

Transient line regulation

time

Start-up time

0.25

Recovery time

From sleep to on with constant load

< 10

100

µs

Slew rate (rising or falling)(4)

mV/µs

Active (PWM and PSM)

–10

Output ripple

Sleep (PFM)

–2%

Current limit for PWM/PSM mode

switch. PSM is below this limit, and

Active mode

150

200

PWM is above this limit.

Overshoot

Softstart

Output pulldown resistance

In Off mode

500

700

(1)

Accuracy includes all variations (line and load regulations, line and load transients, temperature, and process).

(2)

VBAT = 3.6 V, VDD1 = 1.2 V, Fs = 3.2 MHz, L = 1

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

(3)

For negative transient load, the output voltage must discharge completely and settle to its final value within 100 ms. Transient load is

specified at Vout max with a ±50% external capacitor accuracy and includes temperature and procress variation.

(4)

Load current varies proportional to the output voltage. The slew rate is for increasing and decreasing voltages and the load current is 1.1

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