LP6343 Datasheet, PDF (1/12 Pages) Lowpower Semiconductor inc – Output Voltage Range: 0.6V to VIN

Preliminary Datasheet
LP6343
1.5MHz, 3A Step-down Converter With Soft-Start
General Description
The LP6343 contains a independent 1.5MHz constant
frequency, current mode, PWM step-down converters.
The converter integrates a main switch and a
synchronous rectifier for high efficiency without an
external Schottky diode. The LP6343 is ideal for
powering portable equipment that runs from a single cell
Lithium-Ion (Li+) battery. The converter can supply
3000mA of load current from a 2.5V to 5.5V input
voltage. The output voltage can be regulated as low as
0.6V. The LP6343 can also run at 100% duty cycle for
low dropout applications.
The LP6343 is available in a 10-lead 3mm*3mm TDFN-10
and EMSOP-10 package and is rated over the -40°C to
85°C temperature range.
Order Information
LP6343□ □ □ □
F: Pb-Free
Package Type
QV: TDFN-10
MS: MSOP-10(E)
Output type
A: Adjustable
Typical Application Circuit
Features
— Input Voltage Range: 2.5V to 5.5V
— Output Voltage Range: 0.6V to VIN
— 3000mA Load Current on Channel
— Up to 95% Efficiency
— 100% Duty Cycle in Dropout
— < 1 u A Quiescent Current
— 1.5MHz Switching Frequency
— Soft star Function
— Short Circuit Protection
— Current Mode Operation
— Thermal Fault Protection
— 3 m m × 3 m m TDFN-10 or MSOP-10 Package
— RoHS Compliant and 100% Lead (Pb)-Free
Applications
— Portable Media Players
— Cellular and Smart mobile phone
— PDA/DSC
— GPS Applications
Marking Information
Please see website. www.lowpowersemi.com
VIN_5V
22uF
LP6343AQVF
1
2
3
EN
Vin
Vin
4
PGOOD
SW ⁷
SW ⁸
2.2uH
22pF
FB ⁵
Vout=(R1/R2+1)*0.6V
3.3V/3A
R1
45K
22uF*2
R2
10K
LP6343 –00 Version 1.0 Datasheet
Feb.-2010
www.lowpowersemi.com
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