LX1736 datasheet(2/7 Pages) MICROSEMI

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LX1736

PRODUCTION DATA SHEET

Microsemi

Analog Mixed Signal Group

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 2

5V 1.25A 1.0MHz PWM/PFM STEP DOWN REGULATOR

Rev. 1.1., 11/25/2008

ABSOLUTE MAXIMUM RATINGS

Input Voltage (VCC or VPWR) ..................................................................... -0.3V to 7.0V

SW to GND........................................................................................ -0.3V to (VIN + 0.3V)

VFB to GND................................................................................................... -0.3V to +2V

SW Peak Current .....................................................................................Internally Limited

Junction Operating Temperature Range........................................................0°C to +125°C

Storage Temperature Range, TA..................................................................-65°C to 150°C

Maximum Junction Temperature ............................................................................... 150°C

Package Peak Temp. for Solder Reflow (40 seconds max. exposure)........... 260°C (+0, -5)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to

Ground. Currents are positive into, negative out of specified terminal

THERMAL DATA

LD Plastic MLP 3x3mm MO-229, 6-Pin

THERMAL RESISTANCE

-JUNCTION TO CASE,

°C/W

THERMAL RESISTANCE

-JUNCTION TO AMBIENT,

25 to 50

°C/W

Junction Temperature Calculation: TJ = TA + (PD x θJA).

The

JA numbers are guidelines for the thermal performance of the device/pc-board system. All of

the above assume no ambient airflow.

PACKAGE PIN OU T

GND

VPWR

VCC

LD PACKAGE

(Top View)

RoHS / Pb-free 100% matte Tin Pin Finish

FUNCTIO N AL PIN DESCRIPTION

Name Pin #

Description

VCC

Unregulated supply voltage input, ranging from +4V to 6.0V for internal analog control circuitry.

VPWR

Unregulated supply voltage input (+4V to 6.0V), high current path, supplies PMOSFET Drain of PWM switch.

Feedback input for setting programming output voltage.

GND

Circuit ground for IC analog circuitry and high frequency gate drive bias, exposed pad area on bottom of

package may be connected to ground or left floating.

Inductor and commutation diode connection point. Connects to internal PMOSFET Source of PWM Switch

output.

RECOMM ENDED OPERATING CONDITIONS

LX1736

Parameter

Symbol

Min

Typ

Max

Unit

Input Operating Voltage Range

VIN

4.5

5.5

Continuous Output Current Range

IOUT

0.9

Output Voltage Range

VOUT

0.8

80% of VIN V

Operating Junction Temperature

125

°C

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