LR8301 Datasheet, PDF (1/9 Pages) Leshan Radio Company – SMALL PACKAGE PFM CONTROL STEP-UP DC/DC CONVERTER

LESHAN RADIO COMPANY, LTD.
SMALL PACKAGE PFM CONTROL
STEP-UP DC/DC CONVERTER
Introduction
The LR8301 Series is a CMOS PFM-control
step-up switching DC/DC converter that
mainly consists of a reference voltage
source, an oscillator, and a comparator. The
PFM controller allows the duty ratio to be
automatically switched according to the load
(light load: 50%, high output current: 75%),
enabling products with a low ripple over a
wide range, high efficiency, and high output
current. With the LR8301 Series, a step-up
switching DC/DC converter can be
configured by using an external coil,
capacitor, and diode. The built-in MOS FET is
turned off by a protection circuit when the
voltage at the LX pin exceeds the limit to
prevent it from being damaged. This feature,
along with the mini package and low current
consumption, makes the LR8301 Series
ideal for applications such as the power
supply unit of portable equipment.
Applications
• Power supply for portable equipment such
as digital cameras, electronic notebooks, and
PDAs
• Power supply for audio equipment such as
portable CD/MD players
• Constant voltage power supply for cameras,
video equipment, and communications
equipment
• Power supply for microcomputers
LR8301 Series
Features
• Low voltage operation: Startup at 0.9 V
min. (I_OUT = 1 mA) guaranteed
• Duty ratio: 66/78%, builtin auto switching
type PFM controller
• External parts: Coil, capacitor, diode
• Output voltage: Settable to between 1.8
to 6.5 V in 0.1 V steps
• Accuracy of ±2%
• High efficiency：±85%（typ.）
• Standard function (product type A)
• Shutdown function (product type C、D)
• External transistor type available
(product type B、D)
Ordering Information
1/9