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LXDC55KAAA-205
Micro DC-DC converter
1. Features
 Small footprint Buck converter for up to 3A output current application
 Low EMI noise using an inductor-embedded ferrite substrate
 Input voltage range : 2.7 to 5.5V
 User Adjustable Output voltage : 0.8 to 3.6V
 PWM/PFM mode
 Powergood function
 Over current protection, Over temperature protection
2. Mechanical Details
Unit:mm
Mark
Dimension
Mark
Dimension
L
5.0 +/- 0.2
e
1.1
W
5.7 +/- 0.2
f
0.6
T
2.1 MAX
g
0.35
a
0.25
h
0.6
b
0.7
i
0.35
c
0.4
j
1.0
d
0.8
1
April 2013
LXDC55KAAA-205
Micro DC-DC converter
Pin configuration
Pin No.
Symbol
I/O
Description
1
EN
Input
ON/OFF control pin
H: Enable, L: Disable
4,5
Vin
Input
Power supply voltage Input pin
6,12
GND
7,8
Vout
Output
Regulated voltage output pin
10
PG
Output
Power good output pin
H: Normal Operation
11
FB
Input
External resistor connection pin for output
voltage setting
2,3,9,13,14
NC
-
GND pin
No connection
This pin can be connected to any other pins
-
2
April 2013
LXDC55KAAA-205
Micro DC-DC converter
3. Electrical Specification
3-1
Absolute maximum ratings
Parameter
symbol
rating
Unit
Vin
6
V
Maximum EN pin voltage
VEN
6
V
Maximum FB pin voltage
VFB
6
V
Maximum PG pin voltage
VPG
Vin
Maximum input voltage
V
Operating temperature
TOP
-40 to +85
o
Storage temperature
TSTO
-40 to +85
o
C
C
3-2 Electrical characteristics (Ta=25℃)
Parameter
Symbol
Condition
Min.
Typ.
Max.
Unit
Input voltage
Vin
2.7
5.5
V
Output voltage range
Vout
0.8
3.6
V
2.3
V
UVLO
UVLO
Output voltage
accuracy
Vacc
Load current range
Iout
Over current protection
OCP
Vin Falling
2.1
hysteresis
2.2
200
PWM mode
Auto-recovery
mV
-2.5
+2.5
%
0
3000
mA
3000
5500
mA
Vin=5V, RFB=576ohm,
Ripple voltage
Vrpl
(Vout=3.3V)
20
mV
93
%
Iout=1500mA, BW=100MHz
Vin=5V, RFB=576ohm,
Efficiency
EFF
T.B.D.
(Vout=3.3V)
Iout=1500mA, BW=100MHz
EN control voltage
Power good threshold
Power good
sink current
External output
capacitor(*1)
VENH
ON ; Enable
VENL
OFF ; Disable
1.0
Vin
V
0
0.4
V
PGTHH
Output voltage rising
95
%
PGTHL
Output voltage falling
90
%
IPG
Cout
22
1
mA
150
uF
・(*1) External capacitors (Cout>22uF) shall be placed near the module in order to proper operation.
・The above characteristics are tested using the application circuit on section 4.
3
April 2013
LXDC55KAAA-205
Micro DC-DC converter
3-3 Output Current Thermal Derating (Vin=5.0V)
Thermal Derating
3.5
Io[A]
3
2.5
Vo=0.8V
2
Vo=1.2V
1.5
Vo=1.8V
1
Vo=3.3V, 3.6V
0.5
0
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
Ta[℃ ]
Note: This thermal derating data is measured on Murata evaluation board and reference only.
The temperature of the module depends on PCB design and peripheral components.
Please keep the module temperature under 105 oC on your board.
4
April 2013
LXDC55KAAA-205
Micro DC-DC converter
4. Application Circuit
Cin :
GRM21BB30J106 (10uF/6.3V MLCC)
Cout :
GRM21BB30J226 (22uF/6.3V MLCC)
5. Reference Land Pattern
e
f
e
f
e
(5)
(4)
(3)
(6)
(14)
(13)
(7)
(8)
(9)
(2)
(1)
(12)
(10) (11)
b cb cd c b cb
unit (mm)
Mark
Dimension
b
0.7
c
0.4
d
0.8
e
1.1
f
0.6
*Reference purpose only
5
April 2013
LXDC55KAAA-205
Micro DC-DC converter
6. Output Voltage adjustment
Output voltage can be adjusted by using a resistor (RFB) between FB pin and GND pin.
RFB = 5.44/(Vout-0.8V) – 1.6 [kohm]
RFB Example
Vout(V)
RFB(kohm)
Vout(V)
RFB(kohm)
0.8
OPEN
2.5
1.6
1.2
12
3.0
0.872
1.5
6.17
3.3
0.576
1.8
3.84
3.6
0.342
6
April 2013
LXDC55KAAA-205
Micro DC-DC converter
7. Typical Electric Performance (reference purpose only) (Ta=25℃)
Micro DCDC Converter evaluation board (P2LX1568F)
Measurement setup
Power good
Vout_S
Load
A
GND_S
Output voltage
adjustment resistor
Vout
GND
Vin
V
V
GND
Vin_S
GND_S
A
V
Enable SW
* Evaluation board initial output Voltage setting : 3.3V ( resistor : 560Ω + 16Ω )
7
April 2013
LXDC55KAAA-205
Micro DC-DC converter
Efficency
Vin=5.0V,
Output Ripple-Noise
Vin=5.0V,
BW : 100MHz
8
April 2013
LXDC55KAAA-205
Micro DC-DC converter
Load Regulation
Vin=5.0V, Vout=0.8V
Vin=5.0V, Vout=1.2V
Vin=5.0V, Vout=1.8V
Vin=5.0V, Vout=2.5V
Vin=5.0V, Vout=3.3V
Note:
1. This datasheet's specifications are subject to change or our products in it may be discontinued without advance notice. Please check with
our sales representatives or product engineers before ordering.
2. This datasheet has only typical specifications because there is no space for detailed specifications. Therefore, please approve our product
specifications or transact the approval sheet for product specifications before ordering.
9
April 2013
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Murata:
LXDC55KAAA-205
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