LM2650 datasheet(3/11 Pages) NSC

3 / 11 page

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

(All voltages are referenced to the PGND and GND pins.)

DC Voltage at PV

IN and VIN

20V

DC Voltage at SD, SLEEP LOGIC

and SYNC

15V

DC current into SW

±7.5A

Junction Temperature

Limited by the IC

DC Power Dissipation (Note 2)

1.28W

Storage Temperature

−65˚C to +150˚C

Soldering Time, Temperature (Note

Wave (4 seconds)

Infrared (10 seconds)

Vapor Phase (75 seconds)

260˚C

240˚C

219˚C

ESD Susceptibility (Note 4)

1.3 kV

Operating Ratings (Note 1)

Supply Voltage Range (PV

IN and

IN)

4.5V to 18V

Junction Temperature Range

−40˚C to +125˚C

Electrical Characteristics

PVIN = 15V, VSLEEP LOGIC = 0V and VSD = 0V unless superseded under Conditions. Typicals and limits appearing in plain

type apply for T

A =TJ = +25˚C. Limits appearing in boldface type apply over the full junction temperature range shown under

Operating Ratings.

Symbol

Parameter

Conditions

Typ (Note 5)

Limit (Note 6)

Units

OUT

Output Voltage

R1 = 75 k

Ω, 1%,

R2=25 k

Ω, 1%,

7.5V

≤ V

PVIN ≤ 18V

0.12A

≤ I

LOAD ≤ 3A

5.00

4.80/4.75

5.20/5.25

V(min)

V(max)

η1

System Efficiency

LOAD = 1A, TA = 25˚C,

OSC Not Adjusted

η2

System Efficiency

LOAD = 3A, TA = 25˚C,

OSC Not Adjusted

REF

Reference Voltage

SLEEPLOGIC = 3V (Note 7)

1.25

1.281/1.294

1.219/1.206

V(min)

V(max)

Quiescent Current in PWM

mode

FB =VREF

−20mV (Note 8)

4.0

6.50/7.0

mA(max)

Quiescent Current in Sleep

mode

FB =VREF −20mV,

SLEEPLOGIC = 3V (Note 8)

850

1.35/1.60

µA

mA(max)

QSD

Quiescent Current in Shutdown

mode

SD =3V

(Note 8)

20/25

µA

µA(max)

DS(on) HS

DC On-Resistance

Drain-to-Source of the

High-Side Power Switch

DS = 1A,

SLEEPLOGIC = 3V,

FB = 3V,

BOOT = 24V

130

170/245

Ω

Ω(max)

DS(on) LS

DC On-Resistance

Drain-to-Source of the

Low-Side Power Switch

DS = 1A,

FB =3V

125

175/245

Ω

Ω(max)

LHS

Leakage current of the

High-Side Power Switch

PVIN = 18V, VSW = 0V,

SD =3V

100

µA(max)

LLS

Leakage current of the

Low-Side Power Switch

PVIN = 18V, VSW = 18V,

SD =3V

210

µA

µA(max)

LIMIT

Active Current Limit of the

High-Side Power Switch

PVIN = 15V,

BOOT = 24V,

FB = 3V,

SLEEPLOGIC = 3V,

5.5

3.5

7.5

A(min)

A(max)

OSC

Oscillator Frequency

FB =VREF −20 mV

80/75

100/105

kHz

kHz(min)

kHz(max)

MAX

Maximum Oscillator Frequency

FREQ ADJ = 100µA,(Note 9)

FB =VREF −20 mV

315

270/260

360/370

kHz

kHz(min)

kHz(max)

MAX

Maximum Duty Cycle

FB =VREF −20 mV,

OSC Not Adjusted

94/93

%(min)

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