R5973ADTR datasheet(6/38 Pages) STMICROELECTRONICS

Part #	R5973ADTR

Description	Up to 1.5 A step-down switching regulator for aerospace applications

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Electrical characteristics

R5973AD

6/38

DocID027027 Rev 1

3

Electrical characteristics

TJ = -40 °C to 125 °C, VCC = 12 V, unless otherwise specified.

Table 4. Electrical characteristics

Symbol

Parameter

Test condition

Min.

Typ.

Max.

Unit

VCC

Operating input voltage range

4

36

V

RDS(on)

MOSFET on resistance

0.250

0.5



IL

Maximum limiting current(1)

VCC = 5 V

1.8

2.3

A

VCC = 5 V, TJ = 25 °C

2

2.3

fSW

Switching frequency

425

500

575

kHz

Duty cycle

0

100

%

Dynamic characteristics

V5

Voltage feedback

4.4 V < VCC < 36 V

1.198

1.235

1.272

V

h

Efficiency

V0 = 5 V, VCC = 12 V

90

%

DC characteristics

Iqop

Total operating quiescent

current

57

mA

Iq

Quiescent current

Duty cycle = 0; VFB = 1.5 V

2.7

mA

Iqst-by

Total standby quiescent current

Vinh > 2.2 V

50

100

A

Inhibit

INH threshold voltage

Device ON

0.8

V

Device OFF

2.2

V

Error amplifier

VOH

High level output voltage

VFB = 1 V

3.5

V

VOL

Low level output voltage

VFB = 1.5 V

0.4

V

Io source

Source output current

VCOMP = 1.9 V; VFB = 1 V

190

300

A

Io sink

Sink output current

VCOMP = 1.9 V; VFB = 1.5 V

1

1.5

mA

Ib

Source bias current

2.5

4

A

DC open loop gain

RL =



50

57

dB

gm

Transconductance

ICOMP = -0.1 mA to 0.1 mA;

VCOMP = 1.9 V

2.3

mS

Synch function

High input voltage

VCC = 4.4 to 36 V

2.5

VREF

V

Low input voltage

VCC = 4.4 to 36 V

0.74

V

Slave synch current(2)

Vsynch = 0.74 V, Vsynch = 2.33 V

0.11

0.21

0.25

0.45

mA

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