LXDC3EP series
Micro DC-DC converter
1. Features
Low EMI noise and small footprint (11mm )using inductor-imbedded ferrite substrate
High efficiency using synchronous rectifier technology at 4MHz operation.
nchronous
Power-Save mode / Forced PWM automatic mode switching function
2% DC output voltage accuracy (PWM mode
PWM mode).
1A maximum load capability
Wide input voltage range : 2.5 - 5.5V
Fixed output voltage : 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V
V,
Internal soft start, over current protection thermal shutdown protection
,
protection,
2
2. Description
The LXDC3EP series is a 1A output step-down DC-DC converter, which is suitable for a space-limited or
noise-sensitive application. The device utilizes an inductor-embedded ferrite substrate, and the substrate
eliminates radiated EMI noise and conduction noise efficiently.
With just this device, it can be used as a LDO replacement Its low noise feature assures reliable power supply
replacement.
quality.
The LXDC3EP series has a mode pin that allows the user to select Forced PWM mode or Power
Power-Save mode that
changes modes between pulse-skip operation and PWM operation automatically depending on the load.
skip
In Power-Save mode, LXDC3EP series offers superior efficiency under light load condition and it extends the
Save
conditions,
battery life. When Forced PWM mode is selected, it works at a fixed frequency (4MHz) within the load range. The
advantages of this mode are easy filtering of the switching frequency and a better load transient response.
The integrated over current protection and the thermal shutdown protection features offer reliable power supply
operation.
3. Typical Application Circuit
1
Dec
2014
LXDC3EP series
Micro DC-DC converter
4-2 Pin function
Pin
1
Symbol
EN
I/O
Input
Function
This is the ON/OFF control pin of the device. The device is in shutdown
mode when the voltage to this pin is below 0.4V. Pulling this pin above 1.2V
turns on the device with a soft start. This pin should not be left floating.
EN=H: Device ON, EN=L: Device OFF
Ground pin
Regulated voltage output pin.
Apply output load between this pin and GND.
This is the operation mode select pin. This pin must not be left floating and
must be terminated.
Mode=H: Forced PWM mode
Mode=L: Power-Save mode
The Vin pin supplies current to the LXDC3EP internal regulator.
2,3,5,6,9
4
7
GND
Vout
MODE
－
Output
Input
8
Vin
Input
4-3 Functional Block Diagram
EN Mode
Vin
UVLO
Clock
Soft Start
EA
Thermal
Shutdown
Gate
Driver
Switching
Controller
Current
Sense
OCP
Cin
Embedded L
Vout
Cout
Control IC
LXDC3EP
GND
3
Dec
2014
京公网安备 11010802033920号
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