LXDC3EP TypeF series
Micro DC-DC converter
1. Features
Low EMI noise and small footprint (11mm
2
)using inductor-imbedded ferrite substrate
High efficiency using
synchronous rectifier technology at 4MHz operation.
Power-Save mode / Forced PWM automatic mode
switching function
2% DC output voltage accuracy (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
Internal soft start, over current protection, thermal shutdown protection
2. Description
The LXDC3EP series is a 1A output step-down DCDC converter, which is suitable for a space-limited or a noise-
sensitive application. The device utilizes an inductor-embedded ferrite substrate, and the substrate eliminates
radiated EMI noise and conduction noise efficiently.
By just putting this device, it can be used as a LDO replacement. Its low noise feature and easy to assembly
feature assures reliable power supply quality.
The LXDC3EP series has a mode pin that allows the user to select Forced PWM mode or Power-Save mode that
changes modes between pulse-skip operation and forced PWM operation automatically depending on the load.
In Power-Save mode, LXDC3EP series offers superior efficiency under light load condition, and it extends the
battery life. When Forced PWM mode is selected, it works at fixed frequency (4MHz) over all load range. The
advantages of this mode are easy filtering of switching frequency and better load transient response.
The integrated over current protection and the thermal shutdown protection features offer a reliable power supply
operation.
3. Typical Application Circuit
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February 2016
LXDC3EP TypeF series
Micro DC-DC converter
4. Mechanical details
4-1 Out line
unit (mm)
Symbol
L
W
T
Dimension
3.5+/- 0.2
3.2+/- 0.2
1.3MAX
Symbol
a
b
c
d
e
Dimension
0.2+/- 0.2
0.8+/- 0.1
0.4+/- 0.1
0.7+/- 0.1
0.6+/- 0.1
Function
This is the ON/OFF control pin of the device. The device is in shutdown
when the voltage to this pin is below 0.4V. Pulling this pin above 1.2V
enables the device with 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
Vin pin supplies current to the LXDC3EP internal regulator.
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February 2016
4-2 Pin function
Pin
1
Symbol
EN
I/O
Input
2,3,5,6,9
4
7
GND
Vout
MODE
－
Output
Input
8
Vin
Input
LXDC3EP TypeF series
Micro DC-DC converter
5. Ordering Information
Part number
LXDC3EP10F-208
LXDC3EP12F-151
LXDC3EP15F-263
LXDC3EP18F-264
LXDC3EP25F-265
LXDC3EP33F-204
Output Voltage
1.0V
1.2V
1.5V
1.8V
2.5V
3.3V
Device Specific Feature
Output current derating improvement type
Output current derating improvement type
Output current derating improvement type
Output current derating improvement type
Output current derating improvement type
Output current derating improvement type
MOQ
T/R,1000pcs/R
T/R,1000pcs/R
T/R,1000pcs/R
T/R,1000pcs/R
T/R,1000pcs/R
T/R,1000pcs/R
6. Electrical Specification
6-1 Absolute maximum ratings
Parameter
Maximum pin voltage
Operating ambient temperature
symbol
Vin, EN, MODE
T
a
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February 2016
rating
6.0
-30 to +85
Unit
V
o
C
LXDC3EP TypeF series
Micro DC-DC converter
Operating IC temperature
Storage temperature
T
IC
T
STO
-30 to +125
-30 to +85
o
o
C
C
6-2 Electrical Characteristics (Ta=25
o
C)
Parameter
Symbol
Condition
LXDC3EP10F-208
LXDC3EP12F-151
LXDC3EP15F-263
Input voltage
Vin
LXDC3EP18F-264
LXDC3EP25F-265
LXDC3EP33F-204
UVLO Voltage
UVLO
LXDC3EP10F-208
LXDC3EP12F-151
Output voltage
accuracy
PWM Mode
Vin-Vout>0.7V
LXDC3EP15F-263
LXDC3EP18F-264
LXDC3EP25F-265
LXDC3EP33F-204
Load current
range
Iout
LXDC3EP10F-208
Vin=3.7V
Io=1000mA
BW=100MHz
Vin=3.7V
Ripple Voltage
Vrpl
Io=1000mA
BW=100MHz
Vin=5.0V
Io=1000mA
BW=100MHz
LXDC3EP25F-265
-
20
-
mV
(p-p)
LXDC3EP12F-151
LXDC3EP15F-263
LXDC3EP18F-264
-
15
-
0.976
1.176
1.47
1.764
2.45
3.234
0
3.0
4.0
3.7
5.0
2.2
1.0
1.2
1.5
1.8
2.5
3.3
-
1.024
1.224
1.53
V
1.836
2.55
3.366
1000
mA
5.5
5.5
V
2.5
3.7
5.5
V
Min.
Typ.
Max.
Unit
Vout
LXDC3EP33F-204
LXDC3EP10F-208
LXDC3EP12F-151
-
20
86
88
90
92
94
-
-
Efficiency
EFF
Vin=3.7V
Io=300mA
LXDC3EP15F-263
LXDC3EP18F-264
LXDC3EP25F-265
4
-
-
-
%
February 2016
LXDC3EP TypeF series
Micro DC-DC converter
ENon
Enable Voltage
ENoff
MODE-H
MODE Voltage
Parameter
SW Frequency
Over Current
Protection
Start -up Time
MODE-L
Symbol
Freq
OCP
Ton
Vin=5.0V
Io=300mA
ON; Enable
OFF; Disable
LXDC3EP33F-204
1.2
-
1.2
-
Min.
-
1000
-
94
-
-
-
-
Typ.
4
1200
170
-
-
0.4
-
0.4
Max.
-
1700
-
V
Unit
MHz
mA
usec
V
High; Forced PWM mode
Low; Power-Save mode
Condition
(*1)The above characteristics are tested using the application circuit on section 8
6-3 Thermal and Current De-rating Information
The following figure shows the power dissipation and temperature rise characteristics example. These data are
measured on Murata’s evaluation board of this device at no air-flow condition.
LOSS-ΔT
Characteristics(Vin=5.5V,Vo=1.2V)
LOSS-ΔT
Characteristics(Vin=5.5V,Vo=1.2V)
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
Iout[mA]
30
25
20
15
10
5
0
Power Dissipation[mW]
The output current of the device may need to be de-rated if it is operated in a high ambient temperature or in a
continuous power delivering application. The amount of current de-rating is highly dependent on the
environmental thermal conditions, i.e. PCB design, nearby components or effective air flows. Care should
especially be taken in applications where the device temperature exceeds 85
o
C.
The case temperature of the device must be kept lower than the maximum rating of 125
o
C. It is generally
recommended to take an appropriate de-rating to IC temperature for a reliable operation. A general de-rating for
the temperature of semiconductor is 80%.
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February 2016
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