L5953_07 datasheet(9/31 Pages) STMICROELECTRONICS

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L5953

Block diagram and electrical specifications

9/31

Efficiency

f = 260kHz; Io = 0.5A

f = 400kHz; Io = 0.5A

SVR

Supply voltage ripple rejection

ΔV

i = 1Vrms;

fripple = 300Hz; Io = 0.4A

Oscillator

Switching frequency

240

260

280

kHz

Switching frequency

375

400

425

kHz

Voltage stability of switching

frequency

VDD = 8 to 18V

Tbd

Temperature stability of switching

frequency

Tj = -40°C to 85°C

Tbd

Sync

VIL

Low input voltage

0.8

VIH

High input voltage

VOL

Low output voltage

0.4

VOH

High output voltage

ISOURCE=1.5mA

ISLAVE

Slave sink current

100

μA

Output pulse width

300

REG1 - 3.3V/5V STBY linear voltage regulator

VSTBY

Output voltage

no load; ADJ pin = open

no load; ADJ pin = VSTBY pin

4.9

3.20

3.3

5.1

3.4

ΔV

line

Line regulation

no load; 7 < Vdd < 26V

ΔV

load

Load regulation

5mA < Io < 250mA

Vdropout

VSTCAP - VSTBY

Io = 100mA, Vo = 5V

Io = 100mA, Vo = 3.3V

0.36

0.47

0.5

0.65

Ilim

Current limit

Out short to GND

300

SVR

Supply voltage rejection

ΔV

DD = 1Vrms: f = 300Hz

Io = 250mA

REG2 - Linear voltage regulator 1.5V to 3.3V

VLR

Linear regulator output voltage

no load; 4.75

≤ V

IN ≤ 16V;

1+ (R5/R6) = 2.588

3.2

3.3

3.4

no load; 3.135

≤ V

IN ≤ 16V;

1+ (R5/R6) = 1.176

1.45

1.5

1.55

Table 5.

Electrical characteristics (continued) (Tamb = 25°C, VDD = 14.4V)

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

Δf

ΔV

---------

Δf

ΔT

---------

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