STPMIC1APQR datasheet(14/140 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

fREFCLK

Reference

switching

frequency

MHz

IQ_BK1

Total quiescent

current

IBUCK1OUT = 0 mA, HP mode

220

300

µA

IBUCK1OUT = 0 mA, LP mode

IBUCK1IN_LKG

Input leakage

current

BUCK OFF

µA

EFFBK1

Efficiency

IBK1OUT=150 mA, TA = +25 °C

IBK1OUT=750 mA,TA = +25 °C

IBK1OUT=1500 mA,TA = +25 °C

VOUT1-LO

Load transient

regulation

HP mode; 0<IBK1OUT<1.5 A, ΔIBK1OUT = 450 mA,

tR = tF ~250 ns

LP mode; 0<IBK1OUT<50 mA, ΔIBK1OUT = 50 mA

tR = tF ~250 ns

VOUT1-LI

Line transient

regulation

ΔVBK1IN = 600 mV, ΔIBK1OUT = 0, tR = tF ~10 μs,

HP mode

1.5

VOUT1-OVR

Power-up

overshoot

2.8 V<VBK1IN<5.5 V, IBK1OUT~1 mA, TA = +25 °C,

0.725 V<VOUT1<1.5 V

tLP-HP-BK1

Recovery time

from LP to HP

mode

VOUT1_LP = VOUT1_HP

µs

tSU_BK1

Start-up delay

(delay before

voltage starts to

rise)

2.8 V<VBUCK1IN<5.5 V, refer toFigure 46. BUCKx

start-up/shutdown timings

0.05

0.5

tSS_BK1

Soft-start duration

2.8 V<VBUCK1IN<5.5 V, 1 mA<IBK1OUT<100 mA,

VOUT1=1.2 V, refer to Figure 16. Buck4 load

transient in LP mode.

235

400

µs

SRBK1

Output voltage

slew rate

Slew rate during start-up

5.5

mV/µs

DVS slew rate of a voltage programmed change

low to high or high to low, from 0.8 V to 1.2 V

2.3

3.1

mV/µs

tSD_BK1

Shutdown

duration

From VOUT1=1.2 V to VOUT1<0.2 V, VIN=3.6 V,

COUT=22 µF

Slow PD, IBK1OUT<1 mA

1.5

Fast PD, IBK1OUT<1 mA

0.15

Buck converter 2

VBUCK2IN = 3.6 V, VOUT2 = 1.2 V, recommended BOM, Tj = -40 °C to +125 °C, unless otherwise specified

VBUCK2IN

Main input

voltage range

2.8

5.5

VOUT2

Output voltage

Programmable value, refer to Table 10. BUCK

output settings

1.0 to 1.5

Voltage programming step

VOUT2-ACC

Output voltage

accuracy

VBUCK2IN = 2.8 V to 5.5 V, VOUT2 = 1.0 V to 1.5 V

HP mode IBK2OUT = 0 to 1.0 A

-2

LP mode IBK2OUT = 0 to 50 mA

-4

VOUT2-RIPP

Output voltage

ripple

IBK2OUT = 0 mA, HP mode, TA = +25 °C

STPMIC1

Electrical and timing parameters

DS12792 - Rev 7

page 14/140

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