LM2733

³;´

SW

FB

GND

VIN

SHDN

U1

R3

51KQ

SHDN

GND

5 VIN

C1

2.2PF

R2

13.3KQ

CF

220pF

D1

MBR0520

R1/117KQ

L1/10PH

C2

4.7PF

12V

OUT

330mA

(TYP)

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM2733

SNVS209G – NOVEMBER 2002 – REVISED MAY 2019

LM2733 0.6- and 1.6-MHz Boost Converters With 40-V Internal FET Switch in SOT-23

1

1 Features

1

•

40-V DMOS FET switch

•

1.6-MHz (“X”), 0.6 MHz (“Y”) Switching frequency

•

Low RDS(ON) DMOS FET

•

Switch current up to 1 A

•

Wide input voltage 2.7 V to 14 V

•

Low shutdown current (< 1 µA)

•

5-Pin SOT-23 package

•

Uses tiny capacitors and inductors

•

Cycle-by-cycle current limiting

•

Internally compensated

2 Applications

•

White LED current source

•

PDAs and palm-top computers

•

Digital cameras

•

Portable phones and games

•

Local boost regulator

3 Description

The LM2733 switching regulators are current-mode

boost converters operating fixed frequency of 1.6

MHz (“X” option) and 600 kHz (“Y” option).

The use of SOT-23 package, made possible by the

minimal power loss of the internal 1-A switch and use

of small inductors and capacitors, results in the

industry's highest power density. The 40-V internal

switch makes these solutions perfect for boosting to

voltages of 16 V or greater.

These parts have a logic-level shutdown pin that can

be used to reduce quiescent current and extend

battery life.

Protection is provided through cycle-by-cycle current

limiting and thermal shutdown. Internal compensation

simplifies design and reduces component count.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM2733

SOT-23 (5)

2.90 mm × 1.60 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application Circuit

Efficiency vs. Load Current