INNOLINE
DC/DC-Converter
with 3 year Warranty
ROF-78E
Non Isolated
Power Module
●Low Profile 4.0mm
●Low Cost
●Wide Input Range (5V - 36V)
●Short Circuit Protection
●Castellated Connections
Features
Selection Guide
Part Input Output Output Efficiency
Number Range Voltage Current
(VDC) (VDC) (mA) (%)
ROF-78E3.3-0.5SMD-R 5 - 36 3.3 500 73 - 84
ROF-78E5.0-0.5SMD-R 9 - 36 5.0 500 79 - 87
RoHS
2011/65/EU
6/6
Input Voltage Range 5 - 36 VDC (12/24V typ)
No Load Input Current 5mA max.
Maximum Input Current 0.5A max.
Short Circuit Input Current 200mA max.
Voltage Accuracy ±5% max.
Line Regulation (LL to HL at Full Load) ±1% max.
Load Regulation (10 ~ 100%) ±3% max.
Minimum Load* 10%
Ripple & Noise (20MHz Limited) 100mV max.
Transient Response 100% ~ 50% Load ±100mV
(20MHz Limited) 100% ~ 10% Load ±200mV
Operating Frequency 650KHz typ.
ON/OFF Enable Pin ON: Open or >1.75V
(max. Input Voltage = 5V) OFF: GND or <0.7V
Standby Current when enable pin = OFF 3.5μA typ. / 6.5μA max.
Current Limit 950mA typ.
Short Circuit Protection Auto Recovery
Operating Temperature -40°C ~ 85°C
Storage Temperature -55°C ~ 125°C
Humidity 95% RH
DImensions (L x W x H) 12.5 x 13.5 x 4.0 mm
Weight 1g
Cooling Method Free Air Convection
MTBF (25°C) MIL-HDBK-217F 3500 x 10³ hours
*Operation at no load will not damage these devices, but they may not meet all of the datasheet specifications.
Specifications (measured at Ta=25°C, Full Load after Warm-Up)
Derating-Graph
(Ambient Temperature)
Output Power (%)
100
Operating Temperature (°C)
50
40
30
20
10
60
70
80
90
20 40 60 80 100
(Ambient Temperature Vin=24V)
110
75 85
Refer to Application Notes
www.recom-power.com I-37REV: 2/2015
Characteristics
Applications
INNOLINE
DC/DC-Converter
ROF-78Exx-0.5SMD
Series
ROF-78E
ROF-78E3.3-0.5SMD
ROF-78E3.3-0.5SMD
Efficiency
Ripple
Standard Application Circuit
ROF-78E5.0-0.5SMD
ROF-78E5.0-0.5SMD
Efficiency (%)
100
400
Load (%)
36V
24V
12V
5V
50
60 80
0
10
20
30
40
60
70
80
90
20 100
Efficiency (%)
100
Load (%)
50
40
30
20
10
60
70
80
90
20 40 60 80 1000
0
9V
12V
24V
36V
Ripple (mV)
100
400
Load (%)
36V
24V
12V
5V
50
60 80
0
10
20
30
40
60
70
80
90
20 100
Ripple (mV)
100
Load (%)
50
40
30
20
10
60
70
80
90
20 40 60 80 1000
0
9V
12V
24V
36V
+Vo
GND
+Vin
GND
ROF-78Exx-
0.5SMD
Enable Pin
I-38 www.recom-power.comREV: 2/2015
ROF-78E3.3-
0.5SMD
REC5-4812DRWZ/H6/A/SMD
+Vin
GND
+3.3V
GND
C1 C2
*High Isolated voltage
*Improved loading / line regulation
*Wide Input voltage range
*Point-of-Load Architecture
+24V
R1
R2
C3
EN
V
t
Power Sequencing
24V
3.3V
Vout
GND
+Vin
GND
ROF-78EXX-
0.5SMD
Schottky
Diode
Vout=
+Vo - Vsd forward
Vout
GND
+Vin
GND
ROF-78EXX-
0.5SMD
Add a blocking diode to Vout if current can flow backwards
into the output, as this can damage the converter when it is
powered down.
The diode can either be fitted across the device if the source is
low impedance or fitted in series with the output.
ROF-78E
Applications
INNOLINE
DC/DC-Converter
ROF-78Exx-0.5SMD
Series
Application Examples
Isolated (Up to 6KV), wide input range regulated output
High efficiency, isolated, dual unregulated outputs
Optional Protection Circuit
ROF-78EXX-
0.5SMD
DC/DC Converter (1:1)
C1
+Vo
COM
GND
+Vin
GND
*Isolated dual output
*Wide Input Range
Enable
www.recom-power.com I-39REV: 2/2015
ROF-78E
Package Style and Pinning (mm)
21
43
13.50
12.50
2.00
2.00
0.25
0.25
2.50
2.50
1.00
3.0
TOP VIEW
BOTTOM VIEW
Recommended Footprint Details
XX.X ± 0.5 mm
XX.XX ± 0.25 mm
Pin Connections
Pin # Out
1 +Vin
2 GND
3 +Vout
4EN
ROF-78EXX-
0.5SMD +Vo
GND
C2 = 1uF
C1 = 1uF
+Vin
GND
Ls = 33uH
Applications
INNOLINE
DC/DC-Converter
ROF-78Exx-0.5SMD
Series
Conduction / Radiation Emission Filter Suggestion
Suggestion for conduction Emission Class A, meet radiation emission Class B
ROF-78EXX-0.5SMD
Surface Mount Package
The capacitors used are ceramic capacitors, rated voltage 50V
I-40 www.recom-power.comREV: 2/2015
The product information and specifications are subject to change without prior notice. RECOM products are not authorized for use in safety-critical applications (such as life support) without RECOM’s explicit
written consent. A safety-critical application is defined as an application where a failure of a RECOM product may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The buyer
shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized use of RECOM products in such safety-critical applications.
