www.murata-ps.com
OKLP-X/35-W12-C
35A Power Block Non-Isolated DC-DC Converter
Typical unit
FEATURES
efficiency (94%,12Vin, 3.3Vout@25A)
High
Power Block (35A, 7-13Vin, 0.8-3.6Vout, SMT)
Small footprint (1" [25.4] x 0.5" [12.7] x
0.44" [11.1])
minimum load required
No
Output Ripple
Low
-40°C to +85°C operating temperature
Strong Thermal Performance
transient response
Fast
Accurate DCR, ±5% tolerance
power density (384W/in³) in a compact
High
footprint (1.0in. x 0.5in.)
Accurate temperature sense
PRODUCT OVERVIEW
Murata Power Solutions has developed the
OKLP-X/35-W12-C, part of a new series of “Power
Block” products to address the growing require-
ments for increased current/power densities
while providing maximum flexibility for power
system architectures. The OKLP-X/35-W12-C has
incorporated all of the power handling components
required for a 35A PoL design providing maximum
flexibility for the power systems engineer to design
the power train using digital or analog controllers;
however, the maximum benefits are achieved when
coupled with ZMDI’s ZSPM1035 single-phase digi-
tal PWM IC controller family. The OKLP-X/35-W12
series will deliver a high efficiency, thermally stable,
high performance & cost effective solution for high
power/current density system requirements.
+7V
Linear
Regulator
Voltage
Detector
VIN
PWM
Output
Filter
VOUT
GND
Thermal Sensor
TEMP
GND
+CS
-CS
Figure 1. Block Diagram
For full details go to
www.murata-ps.com/rohs
(pending)
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OKLP-X/35-W12-C.C01
Page 1 of 18
OKLP-X/35-W12-C
35A Power Block Non-Isolated DC-DC Converter
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
➀
Output
Root Model
Vout
(Volts)
0.8-3.6
Iout (Amps,
max.)
35
Power
(Watts)
82.5
Vin nom.
(Volts)
12
Input
Range
(Volts)
7-13.2
Iin, full load
(Amps)
➁
12.94
Efficiency
➂
Min.
91%
Typ.
94.00%
Dimensions
Inches (mm)
1 x 0.5 x 0.44
(25.4 x 12.7 x 11.1)
OKLP-X/35-W12-C
➀
Typical at Ta = +25°C
➁
@Vin = 7V, Vout = 3.3V, Iout = 25A
➂
@Vin = 12V, Vout = 3.3V, Iout = 25A
PART NUMBER STRUCTURE
OK L P
-
X
/
35
-
W12
-
C
Okami Non-isolated PoL
Surface Mount
Power Block
Output Voltage Range
0.8-3.6Vdc
Input Voltage Range
7-13.2Vdc
Maximum Rated Output
Current in Amps
RoHS Hazardous Substance Compliance
C
= RoHS-6 (does not claim EU RoHS exemption
ZMDI has an optimized digital controller for use with the OKLP-X/35-W12-C. See page 17 for ordering/additional information.
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OKLP-X/35-W12-C.C01
Page 2 of 18
OKLP-X/35-W12-C
35A Power Block Non-Isolated DC-DC Converter
1. Input Requirements
1.1. Voltage:
Parameter
Vin (Pin 6):
Notes
Operating
Absolute max
+7V (Pin 5): Operating
Under-voltage lockout, rising
Under-voltage lockout, falling
Hysteresis
PWM (Pin 3): High
Low
Tri-state current
Min
7
6.7
4.75
0.75
2.5
1, 2
-10
Nom
12
7
Max
13.2
15.0
7.5
5.9
Units
V
V
1.0
5.5
0.8
10
V
µA
1. Sourcing or sinking current to/from PWM (Pin 3) within the specified range will result in both high and low-side MOSFETs to
be held off by the gate-driver circuitry.
2. Before the PWM signal is applied to pin #3 (PWM), ensure that +7V is applied to the gate driver IC supply (pin 5). Other-
wise, permanent damage may result to the unit.
1.2. Current:
Parameter
Vin = 7V, Vout = 3.3V, Iout = 25A
Vin = 7V, Vout = 1.8V, Iout = 30A
Vin = 12V, Vout = 1.8V, Iout = 30A
+7V (Pin 5) (Switching at 500 KHz)
Notes
Min
Nom
Max
12.94
8.77
5.1
40
Units
A
A
A
mA
2. Output Requirements
2.1. Voltage:
Parameter
Operating Range
Notes
Min
0.8
Nom
Max
3.6
Units
V
2.2. Current per Phase:
Parameter
Operating Range
1.0Vout
1.8Vout
3.3Vout
1. 7V to 12V input, switching at 500KHz.
Notes
1
1
1
Min
0
0
0
Nom
Max
35
30
25
Units
A
A
A
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OKLP-X/35-W12-C.C01
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OKLP-X/35-W12-C
35A Power Block Non-Isolated DC-DC Converter
2.3. Power/Efficiency
Parameter
Output Power
Vout = 3.3V, Iout = 25A, Vin = 12V
Vout = 3.3V, Iout = 25A, Vin = 7V
Vout = 1.8V, Iout = 30A, Vin = 12V
Vout = 1.8V, Iout = 30A, Vin = 7V
Vout = 1V, Iout = 35A, Vin = 12V
Vout = 1V, Iout = 35A, Vin = 7V
91
92
89
88
86
86
94
95
92
92
88.8
90
Notes
Min
Nom
Max
82.5
Units
W
%
%
%
%
%
%
Efficiency:
1, 2
1. 35A output, 7V to 12V input, switching at 400KHz, with 200 LFM at 55C
2. Gate drive and controller losses are included. For the purpose of this calculation, controller loss is assumed to be 0.2W.
2.4. Capacitor
Parameter
Input Capacitance
Output Capacitance
Notes
1, 3
2, 3
Min
Nom
52
20.1
Max
Units
µF
µF
1. 3 X 10µf, 25V, X7R; 1 X 22µf, 25V, X5R; 2 X 0.68µf, 25V, X8L
2. 2x 10µF/0805/6.3V/X7R + 1x 0402/0.1µF/16V/X7R.
3. Additional input and output capacitors are to be added externally as part of the buck regulator design.
2.5. Resistor
Parameter
Output-to-GND Resistor
1. 0603 resistor.
Notes
1
Min
Nom
200
Max
Units
Ohm
2.6. Inductor
Parameter
Inductance
DCR (25C)
Isat (125C)
1. See Block Diagram for DCR sense requirements.
Notes
1
Min
337
0.51
Nom
375
0.54
40
Max
413
0.57
Units
nH
mOhm
A
3. Temperature Sense
Parameter
Bias current sourced from controller (into Pin 4)
Voltage at 25C (Pin 4)
Temperature coefficient (0 to 130 C)
Notes
Min
1.345
Nom
495
1.35
-4.4
Max
1.36
Units
uA
V
mV / C
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OKLP-X/35-W12-C.C01
Page 4 of 18
OKLP-X/35-W12-C
35A Power Block Non-Isolated DC-DC Converter
4. Mechanical
4.1. General
Single-board, designed for machine pick-N-place. Footprint is 0.5" x 1.0". Maximum height is 0.48".
Parameter
Notes
Nom
Dimensions
1 x 0.5 x 0.44
25.4 x 12.7 x 11.1
Weight
0.239
6.8
Units
inches
mm
ounces
grams
4.2. Pinout
Pin #
1, 10
2, 9, 11
3
4
5
6
7
8
Name
Vout
GND
PWM
Temperature
+7V
Vin
-Cs
+Cs
Function
Output voltage
Ground for both input and output
3.3V compliant PWM signal to the gate driver
From temperature sense device on the power block for temperature sensing.
Input voltage for gate driver
Input voltage for the MOSFET
Negative DCR sense
Positive DCR sense
25.9
1.02
5.00
.197
1
2
3
4
5
5.1
.20
11
10.16
.400
13.2
.52
1.6
.06
4.3. Mechanical Specifications
10
1.96
11X .077
3.0
.12
9
8
2.74
11x .108
20.00
.787
7
6
RECOMMENDED FOOTPRINT
(VIEWED THROUGH POWER BLOCK)
Figure 2. Recommended Footprint
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OKLP-X/35-W12-C.C01
Page 5 of 18
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