L5973ADTR

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P22

Electrical data L5973AD

4/22 Doc ID 9552 Rev 9

2 Electrical data

2.1 Maximum ratings

2.2 Thermal data

Table 2. Absolute maximum ratings

Symbol Parameter Value Unit

V

8

Input voltage 40 V

V

1

Output DC voltage

Output peak voltage at t = 0.1 μs

-1 to 40

-5 to 40

V

V

I

1

Maximum output current int. limit.

V

4

, V

5

Analog pins 4 V

V

3

INH -0.3V to V

CC

V

2

SYNC -0.3 to 4 V

P

TOT

Power dissipation at T

A

≤ 60 °C 2.25 W

T

J

Operating junction temperature range -40 to 150 °C

T

STG

Storage temperature range -55 to 150 °C

Table 3. Thermal data

Symbol Parameter

HSOP8

Exposed pad

Unit

R

thJA

Maximum thermal resistance junction-ambient

40

(1)

1. Package mounted on board

°C/W

L5973AD Electrical characteristics

Doc ID 9552 Rev 9 5/22

3 Electrical characteristics

T

J

= 25 °C, V

CC

= 12 V, unless otherwise specified

Table 4. Electrical characteristics

Symbol Parameter Test condition Min Typ Max Unit

V

CC

Operating input voltage

range

V

o

= 1.235 V; I

o

= 2 A

436V

R

DS(on)

MOSFET on

resistance

0.250 0.5 Ω

I

l

Maximum limiting

current

V

CC

= 4.4 V to 36 V

22.33.5A

f

s

Switching frequency 500 kHz

Duty cycle 0 100 %

Dynamic characteristics (see test circuit).

V

5

Voltage feedback

4.4 V < V

CC

< 36 V,

20 mA < I

O

< 2 A

1.220 1.235 1.25 V

η

Efficiency

V

O

= 5 V, V

CC

= 12 V

90 %

DC characteristics

I

qop

Total operating

quiescent current

57mA

I

q

Quiescent current

Duty cycle = 0;

V

FB

= 1.5 V

2.7 mA

I

qst-by

Total stand-by

quiescent current

V

inh

> 2.2 V

50 100 μA

Inhibit

INH threshold voltage

Device ON 0.8 V

Device OFF 2.2 V

Error amplifier

V

OH

High level output

voltage

VFB = 1 V 3.5 V

V

OL

Low level output

voltage

VFB = 1.5 V 0.4 V

I

o source

Source output current

V

COMP

= 1.9 V;

V

FB

= 1 V

200 300 μA

I

o sink

Sink output current

V

COMP

= 1.9 V;

V

FB

= 1.5 V

11.5 mA

I

b

Source bias current 2.5 4 μA

DC open loop gain

R

L

= ∞ 50 57 dB

Electrical characteristics L5973AD

6/22 Doc ID 9552 Rev 9

gm Transconductance

I

comp

= -0.1 mA to

0.1mA

V

COMP

= 1.9 V

2.3 mS

Sync function

High input voltage

V

CC

= 4.4 V to 36 V 2.5 V

REF

V

Low input voltage

V

CC

= 4.4 V to 36 V 0.74 V

Slave sink current

V

sync

= 0.74 V

(1)

V

sync

= 2.33 V

0.11

0.21

0.25

0.45

mA

mA

Master output

amplitude

I

source

= 3 mA

2.75 3 V

Output pulse width

no load, V

sync

= 1.65 V 0.20 0.35 μs

Reference section

Reference voltage 3.234 3.3 3.366 V

I

REF

= 0 to 5 mA

V

CC

= 4.4 V to 36 V

3.2 3.3 3.399 V

Line regulation

I

REF

= 0 mA

V

CC

= 4.4 V to 36 V

510mV

Load regulation

I

REF

= 0 to 5 mA 8 15 mV

Short circuit current 10 18 30 mA

1. Guaranteed by design.

Table 4. Electrical characteristics (continued)

Symbol Parameter Test condition Min Typ Max Unit

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P22

L5973ADTR

Mfr. #:

Manufacturer:

STMicroelectronics

Description:

Switching Voltage Regulators 1.235 to 35V Step-Dn

Lifecycle:

New from this manufacturer.

Delivery:

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