www.recom-power.com REV.: 4/2019 I-1
Features • Low profi le 4.0mm
• Low cost
• Wide input range (5V - 36V)
• Short circuit protection
• Casellated connections
ROF-78E
Description
The ROF-78E is a switching regulator with a wide input voltage range, high effi ciency and a low profi le,
pin-less SMD package. Two low-ripple output voltages are available as standard: 3.3V or 5V with 500mA
continuous output current rating over the full operating temperature range of -40°C to +75°C without
derating. An enable connection allows power sequencing or very low standby consumption (3.5µA) for
battery powered applications. These modules can be SMD refl ow soldered. The connection pads have
corner half-vias to enable optical inspection of the joints after soldering.
DC/DC Converter
Non
Isolated
Power Module
Selection Guide
Part Input Output Output Effi ciency
Number Voltage Range Voltage Current typ.
[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
Model Numbering
Output Voltage
Output Current
ROF-78E__-__SMD-R
Notes:
Note1: suffi x -R for tape&reel packaging
Packaging (1)
Ordering Examples:
ROF-78E3.3-0.5SMD-R = 3.3Vout, 0.5A Output Current, SMD, tape and reel packaging
www.recom-power.com REV.: 4/2019 I-2
DC/DC Converter
Specifi cations (measured @ Ta= 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
ROF-78E
Series
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Input Voltage Range nom. Vin= 12VDC and 24VDC 5VDC 36VDC
Input Current 500mA
Quiescent Current 5mA
Minimum Load (2) 10%
ON/OFF CTRL max. Vin= 5VDC DC-DC ON
DC-DC OFF
Open or >1.75VDC
GND or <0.7VDC
Standby Current DC-DC OFF 3.5µA 6.5µA
Internal Operating Frequency 650kHz
Output Ripple and Noise 20MHz BW 100mVp-p
Effi ciency vs. Load Ripple vs. Load
ROF-78E3.3-0.5SMD
0 10 20 30 40 50 60 70 80 90
100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
5Vin
12Vin
24Vin
36Vin
0 10 20 30 40 50 60 70 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Ripple [mV]
Output Load [%]
5Vin
12Vin
24Vin
36Vin
Effi ciency vs. Load Ripple vs. Load
ROF-78E5.0-0.5SMD
0 10 20 30 40 50 60 70 80 90
100
100
80
60
40
90
70
50
30
20
10
0
Efficiency [%]
Output Load [%]
9Vin
12Vin
24Vin
36Vin
0 10 20 30 40 50 60 70 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Ripple [mV]
Output Load [%]
9Vin
12Vin
24Vin
36Vin
www.recom-power.com REV.: 4/2019 I-3
DC/DC Converter
Specifi cations (measured @ Ta= 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
ROF-78E
Series
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) automatic recovery
Short Circuit Input Current 200mA max.
Over Current Protection (OCP) >950mA typ. Hiccup mode
REGULATIONS
Parameter Condition Value
Output Accuracy ±5.0% max.
Line Regulation low line to high line ±1.0% max.
Load Regulation (2) 10% to 100% load ± 3.0% typ.
Transient Response 100% to 50% load
100% to 10% load
±100mV
±200mV
Optional Diode Protection Circuit
+Vout
GNDGND
ROF-78Exx-
5.0SMD
ROF-78Exx-
5.0SMD
+Vout=
+Vout - Vsd forward
GNDGND
+Vin +Vout
+Vin
+Vin
GND
+Vin +Vout
GND
+Vout
GNDGND
ROF-78Exx-
5.0SMD
ROF-78Exx-
5.0SMD
+Vout=
+Vout - Vsd forward
GNDGND
+Vin +Vout
+Vin
+Vin
GND
+Vin +Vout
GND
Add a blocking diode to Vout if
current can fl ow backwards into
the output, as this can damage the
converter when it is powered down.
The diode can either be fi tted
across the device if the source is
low impedance or fi tted in series
with the output (recommended).
Optional Protection 1: Optional Protection 2:
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range with derating @ free air convection (see graph) -40°C to +85°C
Operating Humidity non-condensing 5% - 95% RH max.
MTBF according to MIL-HDBK-217F, G.B. +25°C 3500 x 103 hours
-40 -20 0 20 40 70
75 85
60-30 -10 10 30 50 80 90 100
100
80
60
40
90
70
50
30
20
10
0
Output Load [%]
Ambient Temperature [°C]
Derating Graph
(@ free air convection)
Notes:
Note2: Operation below 10% load will not harm the converter, but specifi cations may not be met
www.recom-power.com REV.: 4/2019 I-4
DC/DC Converter
Specifi cations (measured @ Ta= 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
ROF-78E
Series
SAFETY AND CERTIFICATIONS
Certifi cate Type (Safety) Report / File Number Standard
RoHs 2+ RoHS-2011/65/EU + AM-2015/863
EAC RU-AT.49.09571 TP TC 004/2011
EMC Compliance Condition Standard / Criterion
Information technology equipment - Radio disturbance
characteristics - Limits and methods of measurement with external fi lter EN55032, Class B
EMC Filtering Suggestion according to EN55032 Class A and Class B
Component List Class A and B
C1
L1
ROF-78Exx-0.5SMD
C2
+V
out
GND GND
+V
in
+Vin +Vout
GND
C1 C2 L1
1µF 1µF 33µH
The capacitors used are ceramic capacitors, rated voltage 50V
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter Type Value
Material PCB
FR4, (UL94 V-0)
Package Dimension (LxWxH) 12.5 x 13.5 x 4.0mm
Package Weight 1g typ.
Dimension Drawing (mm)
Pin Connections
Pin # Single
1 +Vin
2 GND
3 +Vout
4 CTRL
Tolerance: xx.xx= ±0.25mm
Recommended Footprint Details
4
1
3
43
2
1
2
2.00 4.00
2.50
Pin 2
2.500.25
0.25
12.50
Bottom View Top View
13.50
www.recom-power.com REV.: 4/2019 I-5
DC/DC Converter
Specifi cations (measured @ Ta= 25°C, nom. Vin, full load and after warm-up unless otherwise stated)
ROF-78E
Series
INSTALLATION AND APPLICATION
GNDGND
+Vin +Vout
ROF-78Exx-0.5SMD
+Vin +Vout
GND
CTRL
Standard Application Circuit
Application Examples
High Effi ciency, Isolated, Dual Unregulated Output
C1
+Vin
+Vin
GND GND
DC/DC Converter (1:1)
Com
+Vout
- Isolated dual output
- Wide Input Range
- High isolation voltage
- Improved loading / line regulation
- Wide input voltage range
- Point-of-load architecture
V
t
3.3V
24V
Power Sequencing
C1
C3
R2
R1 C2
GND GND
REC5/4812DRWZ/H6/A/SMD
+3.3V
+24V
ROF-78Exx-0.5SMD
+Vin +Vout
GNDCTRL
ROF-78Exx-0.5SMD
+Vin +Vout
GNDCTRL
Isolated (up to 6kVDC), Wide Input Range Regulated Output
C1
+Vin
+Vin
GND GND
DC/DC Converter (1:1)
Com
+Vout
- Isolated dual output
- Wide Input Range
- High isolation voltage
- Improved loading / line regulation
- Wide input voltage range
- Point-of-load architecture
V
t
3.3V
24V
Power Sequencing
C1
C3
R2
R1 C2
GND GND
REC5/4812DRWZ/H6/A/SMD
+3.3V
+24V
ROF-78Exx-0.5SMD
+Vin +Vout
GNDCTRL
ROF-78Exx-0.5SMD
+Vin +Vout
GNDCTRL
PACKAGING INFORMATION
Parameter
Type
Packaging Dimension (LxWxH) tape and reel (carton) 355.0 x 342.0 x 36.0mm
Packaging Quantity tape and reel 500pcs
Tape Width 24mm
Storage Temperature Range -55°C to +125°C
Storage Humidity 95% RH max.
The product information and specifications may be subject to changes even without prior written notice.The product has been designed for various applications; its suitability lies in the responsibility of each customer.
The
products are not authorized for use in safety-critical applications without RECOM’s explicit written consent. A safety-critical application is an application where a failure may reasonably be expected to endanger or
cause
loss of life, inflict bodily harm or damage property. The applicant 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.