LR8401 Datasheet, PDF (1/10 Pages) Leshan Radio Company – Synchronous Step-Up DC/DC

Synchronous Step-Up DC/DC Converter with PFM Control
CE8401 Series
LESHAN RADIO COMPANY, LTD.
Synchronous Step-Up DC/DC
Converter with PFM Control
LR8401 Series
 INTRODUCTION
The LR8 401 Series is a Synchronous
step-up DC/DC Converter with PFM Control.
With the LR8 401 Series, a step-up
switching DC/DC converter can be configured
by using an external coil, capacitor. The
built-in MOSFET is turned off by a protection
circuit when the voltage at the LX pin exceeds
the limit to prevent it from being damaged.
 FEATURES
 External parts: Coil, capacitor
 Output voltage: Settable to between 2.1V
to 5.5 V in 0.1 V steps
 Maximum Oscillation frequency:300KHz
 Accuracy of ±2%
 High efficiency：95%
 APPLICATIONS
 Digital cameras
 Electronic notebooks and PDAs
 Portable CD/MD players
 Cameras, video equipment,
 Communications equipment
 Power supply for microcomputers
 BLOCK DIAGRAM
LX
Current
Limiting
comparator
buffer
PFM
control
Error
Amplifier
OSC
ref
EN
Chip
Enable
 ORDER INFORMATION
LR8401①②③④
VOUT
DESIGNATOR SYMBOL
DESCRIPTION
A
Standard LX
①
B
With shutdown, LX
②③
Integer
Output Voltage
（2.1～5.5）
e.g.：3.0V=②:3; ③:0
M
Package：SOT-23-3/5
VSS
④
MB Package：SOT-23
P
Package：SOT-89
T
Package：TO92
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