LXDC32D series
Micro DCDC converter
1. Features
Low EMI noise and small footprint using inductor-imbedded ferrite substrate
2ch type DCDC converter
High efficiency using synchronous rectifier technology at 3MHz operation
PFM/PWM automatic mode switching function
Smooth mode transition between PFM mode and PWM mode with low-ripple-voltage PFM mode
2% DC voltage accuracy over full load current range (Vout=1.2~4V)
Maximum Load Current: 600mA (depends on output voltage)
Fixed output voltage: 0.8V – 4V (factory setting, 50mV step)
Internal soft start, overcurrent protection
2. Description
The LXDC32D series is a low power step-down DC-DC converter suitable for space-limited or noise-sensitive
applications. The device utilizes an inductor-embedded ferrite substrate that reduces radiated EMI noise and
conduction noise.
By adding output capacitors, it can be used as an LDO replacement. Its low noise and easy-to-assemble features
assure reliable power supply quality.
The device works in PFM mode at light load for extended battery life. At heavy load, it changes to PMW mode
automatically and maintains high efficiency using synchronous rectifying technology.
The device provides good output voltage accuracy even in PFM mode. It maintains 2% DC voltage accuracy over
the full current range (0-600mA, depends on output voltage), and shows very smooth mode transition between
PFM mode and PWM mode.
3. Typical Application Circuit
LXDC32D
Enable1
Enable2
Vin
EN1
EN2
Vin
GND
Vout2
Vout2
Vout1
Vout1
Cout1
Cout2
1
Feb. 2016
LXDC32D series
Micro DCDC converter
4．Mechanical Details
4-1 Outline
Top View
Side View
Bottom View
Unit: mm
Mark
Dimension
Mark
Dimension
L
W
T
a
b
c
d
e
f
4-2 Pin Function
3.2
±
0.2
2.5
±
0.2
1.2 MAX
0.4
±
0.1
0.6
±
0.1
0.4
±
0.1
0.15 + 0.2/ - 0.15
0.45
±
0.1
0.4
±
0.1
g
h
i
j
k
l
m
n
0.5
±
0.1
0.15 + 0.2 / - 0.15
0.7
±
0.1
0.3
±
0.1
0.3
±
0.1
0.9
±
0.1
0.4
±
0.1
1.05
±
0.1
Top View
Bottom View
2
Feb. 2016
LXDC32D series
Micro DCDC converter
3
4
5
Pin No.
2
8
6
7
1
8
7
1
2
4
6
5
3
1, 5
2
S
I
Description
y
/
m
O
b
o
l
V I Vin pin supplies current to the LXDC32D internal
i n regulator.
n p
u
t
This is the ON/OFF control pin of the device.
Connecting this pin to GND keeps the device in
I shutdown mode.
E n Pulling this pin to Vin enables the device with soft start.
N p This pin must not be left floating and must be
1 u terminated.
t If this pin is left open, the device may be off around
100mA output.
EN=H: Device ON, EN=L: Device OFF
O Regulated voltage output pin.
u Apply output load between this pin and GND.
t
p
u
t
- Ground pin
3
V
o
u
t
1
G
N
D
4,8
6
I
E n
Np
2 u
t
This is the ON/OFF control pin of the device.
Connecting this pin to GND keeps the device in
shutdown mode.
Pulling this pin to Vin enables the device with soft start.
This pin must not be left floating and must be
terminated.
If this pin is left open, the device may be off around
100mA output.
7
EN=H: Device ON, EN=L: Device OFF
V O Regulated voltage output pin.
o u Apply output load between this pin and GND.
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Feb. 2016
LXDC32D series
Micro DCDC converter
u t
t p
2 u
t
4-3. Functional Block Diagram
5. Ordering Information
Part number
Input
Voltage[V]
Output
Voltage[V]
Vout1
LXDC32DAAC-455
LXDC32DAAC-437
LXDC32DAAC-440
LXDC32DAAC-465
LXDC32DAAC-280
LXDC32DAAC-439
2.3 ~ 5.5
2.8 ~ 5.5
2.8 ~ 5.5
2.8 ~ 5.5
3.5 ~ 5.5
3.5 ~ 5.5
1.2
1.1
1.2
1.5
1.2
1.1
4
Feb. 2016
Vout2
1.3
1.8
1.8
1.8
2.5
2.8
Max Iout[mA]
MOQ
Iout1
600
600
600
600
600
600
Iout2
600
600
600
600
500
450
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
LXDC32D series
Micro DCDC converter
LXDC32DAAC-438
LXDC32DAAC-442
LXDC32DAAC-145
LXDC32DAAC-394
LXDC32DAAC-422
LXDC32DAAC-398
LXDC32DAAC-393
LXDC32DAAC-435
LXDC32DAAC-459
3.5 ~ 5.5
3.7 ~ 5.5
3.7 ~ 5.5
3.7 ~ 5.5
3.8 ~ 5.5
3.8 ~ 5.5
3.8 ~ 5.5
3.8 ~ 5.5
3.8 ~ 5.5
1.2
1.1
1.35
1.8
0.9
0.95
1.0
1.8
2.5
2.8
3.0
3.0
3.0
3.3
3.3
3.3
3.3
3.3
600
600
600
600
600
600
600
600
500
450
350
350
350
300
300
300
300
300
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
T/R, 1000pcs/R
# Output voltage can be set 50mV step from 0.8V to 4.0V. Please ask Murata representative.
6. Electrical Specification
6-1Absolute maximum ratings
Parameter
Input voltage
Operating ambient temperature
Operating IC temperature
Storage temperature
6-2 Electrical characteristics (Ta=25℃
)
Parameter
Symbol
Input voltage
UVLO
Input leak current
V
in
UVLO
Iin-off
Vin=3.7V,EN1=0V,EN2=0V
Vout=0.9V
Vout=0.95V
Vin-Vout>1.0V
Output voltage
accuracy
Vout=1.0V
Vout
Vout=1.1V
Vout=1.2V~2.5V
Vout=2.55V~3.25V
Vin-Vout>1.0V
-2.0
Vin-Vout>0.7V
+2.0
1.076
1.1
1.124
0.976
1.0
1.024
%
0.876
0.926
Symbol
Vin, EN
Ta
T
IC
T
STO
rating
6.3
-40 to +85
-40 to +125
-40 to +85
Unit
V
o
C
o
C
o
C
Typ.
5.0
1.4
0
0.9
0.95
Max.
5.5
1.8
3
0.924
0.974
Unit
V
V
μA
Condition
Min.
2.3
1.0
5
Feb. 2016
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