STPMIC1 datasheet(16/140 Pages) STMICROELECTRONICS

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Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

VOUT3

Output voltage

Programmable value, refer to Table 10. BUCK

output settings

1.0 to 3.4

Voltage programming step

100

VOUT3-ACC

Output voltage

accuracy

VBUCK3IN = 2.8 V to 5.5 V

HP mode IBK3OUT = 0 to 500 mA, VOUT3 = 1.8 V

to 3.3 V

-2.5

2.5

HP mode IBK3OUT = 0 to 500 mA, VOUT3 = 1.0 V

to 3.4 V

-3

LP mode IBK3OUT = 0 to 50 mA, VOUT3 = 1.0 V to

3.4 V

-4

VOUT3-RIPP

Output voltage

ripple

IBK3OUT = 0 mA, HP mode, TA = +25 °C

IBK3OUT = 500 mA, HP mode, TA = +25 °C

IOUT3

Continuous

output current

2.8<VBUCK3IN<5.5 V, HP mode

500

2.8< VBUCK3IN<5.5 V, LP mode

IOUT3_LP_PEAK

Peak output

current in LP

mode

2.8< VBUCK3IN<5.5 V, LP mode, tPEAK < 10 µs

200

IBK3LIM

Inductor peak

current limit

fREFCLK

Reference

switching

frequency

MHz

IQ_BK3

Total quiescent

current

IBUCK3OUT = 0 mA, HP mode

220

300

µA

IBUCK3OUT = 0 mA, LP mode

IBUCK3IN_LKG

Input leakage

current

BUCK OFF

µA

EFFBK3

Efficiency

IBK3OUT=150 mA, TA = +25 °C

IBK3OUT=350 mA,TA = +25 °C

IBK3OUT=500 mA,TA = +2 5°C

VOUT3-LO

Load transient

regulation

HP mode; 0<IBK3OUT<0.5 A, ΔIBK3OUT = 100 mA,

tR = tF ~250 ns

LP mode; 0<IBK3OUT<50 mA ΔIBK3OUT = 50 mA,

tR = tF ~250 ns

VOUT3-LI

Line transient

regulation

ΔVBK3IN = 600 mV, ΔIBK3OUT = 0, tR = tF ~10 μs,

HP mode

1.5

VOUT3-OVR

Power-up

overshoot

2.8 V<VBK3IN<5.5 V, IBK3OUT~1 mA, TA = +25 °C,

0.725 V<VOUT3<1.5 V

tLP-HP-BK3

Recovery time

from LP to HP

mode

VOUT3_LP = VOUT3_HP

µs

tSU_BK3

Start-up delay

(delay before

voltage starts to

rise)

2.8 V<VBUCK3IN<5.5 V, refer to Figure 46. BUCKx

start-up/shutdown timings.

0.05

0.5

tSS_BK3

Soft-start duration

2.8 V<VBUCK3IN<5.5 V, 1 mA<IBK3OUT<100 mA,

VOUT3=1.2 V, refer to Figure 16. Buck4 load

transient in LP mode

235

400

µs

STPMIC1

Electrical and timing parameters

DS12792 - Rev 7

page 16/140

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