L5973 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

MFG CO.

L5973

2.5A SWITCH STEP DOWN SWITCHING REGULATOR

STMicroelectronics 

1 2 3 4 5 6 7 8 9 10

L5973D

ELECTRICAL CHARACTERISTICS (Tj = 25°C, VCC = 12V, unless otherwise specified.)

(*) Specification Referred to Tj from -40 to 125°C (1).

Symbol

VCC

RDSON

Il

fs

Parameter

Operating input voltage range

Mosfet on Resistance

Maximum limiting current

Switching frequency

Test Condition

Vo = 1.235V; Io = 2A

VCC = 4.4V to 36V

Duty cycle

DYNAMIC CHARACTERISTICS (see test circuit ).

V5 Voltage feedback

4.4V < VCC < 36V,

20mA < IO < 2A

η

Efficiency

VO = 5V, VCC = 12V

DC CHARACTERISTICS

Iqop Total Operating Quiescent

Current

Iq

Quiescent current

Duty Cycle = 0; VFB = 1.5V

Iqst-by Total stand-by quiescent current Vinh > 2.2V

VCC = 36V; Vinh > 2.2V

INHIBIT

INH Threshold Voltage

Device ON

Device OFF

ERROR AMPLIFIER

VOH High level output voltage

VFB = 1V

VOL Low level output voltage

VFB = 1.5V

Io source Source output current

VCOMP = 1.9V; VFB = 1V

Io sink Sink output current

VCOMP = 1.9V; VFB = 1.5V

Ib

Source bias current

DC open loop gain

RL = ∞

gm Transconductance

Icomp = -0.1mA to 0.1mA

VCOMP = 1.9V

SYNC FUNCTION

High Input Voltage

VCC = 4.4V to 36V

Low Input Voltage

VCC = 4.4V to 36V

Slave Sink Current

Vsync = 0.74V

Vsync = 2.33V

Master Output Amplitude

Isource = 3mA

Output Pulse Width

no load, Vsync = 1.65V

REFERENCE SECTION

Reference Voltage

IREF = 0 to 5mA

VCC = 4.4V to 36V

Line Regulation

IREF = 0mA

VCC = 4.4V to 36V

Load Regulation

IREF = 0 to 5mA

Short Circuit Current

Min. Typ. Max. Unit

* 4.4

36

V

*

0.150 0.5 Ω

2.5 3 3.5 A

* 212 250 280 KHz

225 250 275 KHz

0

100 %

1.220 1.235 1.25 V

* 1.198 1.235 1.272 V

90

%

*

3

5 mA

2.5 mA

*

50 100 µA

*

80 150 µA

0.8 V

2.2

V

3.5

V

0.4 V

200 300

µA

1 1.5

mA

2.5

4

µA

50 57

dB

2.3

mS

2.5

VREF V

0.74 V

0.11

0.25 mA

0.21

0.45 mA

2.75 3

V

0.20 0.35

µs

3.234 3.3 3.366 V

* 3.2 3.3 3.399 V

5

10 mV

8

15 mV

10

8

30 mA

Notes: 1. Specification over the -40 to +125 Tj Temperature range are assured by design, characterization and statistical correlation.

2. Guaranteed by design.

3/10

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