www.recom-power.com REV.: 4/2018 I-1
Features
Switching
Regulator
• Non-isolated
• Synchronous rectification design
• Adjustable output voltage
• 2, 3, 4 & 5AMP adjustable positive step down
integrated switching regulator
• Over load protection
• Continuous short circuit protection
• Efficiency up to 96%
R-5xxxPA_DA
Description
The R-5xxxA series is a high performance 1.2V to 5.5V, 2Amp to 5Amp, 12-Pin SIP (single in-line
package) integrated switching regulator (ISR). The synchronous - rectified design yields excellent
efficiencies up to 96%. Short circuit protection reduces the short circuit input current to under 50mA.
Autosense function compensates for any losses in long circuit loops.
DC/DC Converter
2,3,4,5 Amp
SIP12
Vertical &
Horizontal
Single Output
IEC/EN60950-1 certified
Selection Guide
Part Input Output Vout Output Efficiency Max. Capacitive
Number Voltage Range Voltage Adjust Range (1) Current @ min Vin @ max. Vin Load (2)
[VDC] [VDC] [VDC] [A] [%] 12V [%] [µF]
R-521.2xA 4.5 - 18 1.2 1.0 - 3.0 2 83 79 75 300/6800
R-521.8xA 4.5 - 18 1.8 1.1 - 4.5 2 88 85 82 300/6800
R-522.5xA 4.5 - 18 2.5 1.6 - 5.5 2 91 88 86 300/6800
R-523.3xA 4.5 - 18 3.3 1.6 - 5.5 2 92 90 89 300/6800
R-525.0xA 6.5 - 18 5.0 3.0 - 5.5 2 95 93 92 300/6800
R-531.2xA 4.5 - 18 1.2 1.0 - 3.0 3 85 84 82 300/6800
R-531.8xA 4.5 - 18 1.8 1.1 - 4.5 3 89 88 86 300/6800
R-532.5xA 4.5 - 18 2.5 1.6 - 5.5 3 92 91 89 300/6800
R-533.3xA 4.5 - 18 3.3 1.6 - 5.5 3 94 93 92 300/6800
R-535.0xA 6.5 - 18 5.0 3.0 - 5.5 3 96 95 94 300/6800
R-541.2xA 4.5 - 18 1.2 1.0 - 3.0 4 82 81 79 300/6800
R-541.8xA 4.5 - 18 1.8 1.1 - 4.5 4 87 86 85 300/6800
R-542.5xA 4.5 - 18 2.5 1.6 - 5.5 4 91 89 88 300/6800
R-543.3xA 4.5 - 18 3.3 1.6 - 5.5 4 93 92 91 300/6800
R-545.0xA 6.5 - 18 5.0 3.0 - 5.5 4 95 94 93 300/6800
R-551.2xA 4.4 - 18 1.2 1.0 - 3.0 5 81 80 78 300/6800
R-551.8xA 4.5 - 18 1.8 1.1 - 4.5 5 86 85 84 300/6800
R-552.5xA 4.5 - 18 2.5 1.6 - 5.5 5 90 89 88 300/6800
R-553.3xA 4.5 - 18 3.3 1.6 - 5.5 5 92 91 90 300/6800
R-555.0xA 7.0 - 1.8 5.0 3.0 - 5.5 5 94 93 92 300/6800
Notes:
Note1: Vin-Vout ≥ 1.5V~4.0V depending on Vout if adjust function is used
Note2: please refer to basic characteristics
Notes:
Note3: x can be „P“= vertical through hole
x can be „D“ = bent for horizontal through hole mounting
Model Numbering
Ordering Examples:
R-553.3PA Iout= 5A nom. Vout= 3.3VDC P= vertical through hole
R-522.5DA Iout= 2A nom. Vout= 2.5VDC D= bent for horizontal through hole mounting
Pinning (3)
Output Current (A)
nom. Output Voltage
R-5_ __ xA
www.recom-power.com REV.: 4/2018 I-2
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
BASIC CHARACTERISTICS
Parameter Condition Min. Typ. Max.
Quiescent Current min. Vin to max. 20mA
Internal Power Dissipation ta<60°C 1.4W
Output Current Limit
R-52xx
R-53xx
R-54xx
R-55xx
2.5A
3.75A
5.0A
6.0A
3.0A
4.25A
5.5A
6.5A
Minimum Load 10%
ON/OFF CTRL (4) DC-DC ON
DC-DC OFF
Open or high, 4.5V min. / 18V max.
Low (Power OFF) 0.8V max.
Input Current of CTRL Pin DC-DC OFF 100µA
Internal Operating Frequency 270kHz 300kHz 330kHz
Output Ripple and Noise R-52xx
R-53xx & R-54xx & R-55xx
40mVp-p
80mVp-p
70mVp-p
120mVp-p
Maximum Capacitive Load normal start-up time, no external diodes 300µF
<1 second start-up time + diode protection circuit 6800µF
continued on next page
How to calculate the max output current
Notes:
Note4: ON/OFF pin driven by TTL (logic gate), open-collector bipolar transistor or open-drain MOSFET
0 0.5
0
20
40
60
80
85
100
Ambient Temperature [°C]
Internal Power Dissipation [W]
1.4
1
Vin = 18V
Vout = 5V
Effmax Vin = 93%
PD = 1.4W
TAmbient = 60°C
Vin = 18V
Vout = 5V
Effmax Vin = 93%
PD = 1W
TAmbient = 85°C
Vin = 12V
Effmax Vin = 94%
PD = 1.0W
TAmbient = 85°C
Iout= 1.4W = 4.0A
5V x (1-0.93 )Iout= 1W = 2.857A
5V x (1-0.93 )
Iout= 1W = 3.33A
5V x (1-0.94 )
Iout= PD
Vout x (1-Effmax Vin )
PD= Iout x Vout x (1-Effmax Vin )
The internal power dissipiation (PD ) follows the equation:
Calculation 1: Calculation 2:
Calculation 3:
Example: R-545.0P
www.recom-power.com REV.: 4/2018 I-3
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
Efficiency vs. Load
R-53xx / R-54xx / R-55xx
Vin=18V
R-53xx / R-54xx / R-55xx
min. Vin
R-52xx
Vin=18V
R-52xx
min. Vin
100
40
60
50
80
70
90
Efficiency [%]
Output Load [A]
0.1 0.5 1 1.5 2
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
100
70
80
75
90
85
95
Efficiency [%]
Output Load [A]
0.1 0.5 1 1.5 2
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
100
70
80
75
90
85
95
Efficiency [%]
Output Load [A]
0.1 1 2 3 4 5
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
100
70
80
75
90
85
95
Efficiency [%]
Output Load [A]
0.1 1 2 3 4 5
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
2ADC R-521.2PA/DA R-521.8PA/DA R-522.5PA/DA R-523.3PA/DA R-525.0PA/DA
3ADC R-531.2PA/DA R-531.8PA/DA R-532.5PA/DA R-533.3PA/DA R-535.0PA/DA
4ADC R-541.2PA/DA R-541.8PA/DA R-542.5PA/DA R-543.3PA/DA R-545.0PA/DA
5ADC R-551.2PA/DA R-551.8PA/DA R-552.5PA/DA R-553.3PA/DA R-555.0PA/DA
Vout nom. 1.2VDC 1.8VDC 2.5VDC 3.3VDC 5.0VDC
Vout adj. R1 R2 R1 R2 R1 R2 R1 R2 R1 R2
0.8
0.9 740Ω
1.0 3.9kΩ
1.1 13kΩ1.05kΩ
1.2 2.1kΩ270Ω
Trim Tables or Calculation
continued on next page
www.recom-power.com REV.: 4/2018 I-4
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
REGULATIONS
Parameter Condition Value
Output Accuracy ±1.0% typ. / ±2.0% max.
Line Regulation low line to high line, full load R-52xx
R-53xx & R-54xx & R-55xx
±0.25% typ. / ±0.5% max.
±0.5% typ. / ±1.0% max.
Load Regulation (5) 10% to 100%, full load R-52xx
R-53xx & R-54xx & R-55xx
±0.5% typ. / ±1.0% max.
±1.0% typ. / ±2.0% max.
Transient Response (6) 50% load step change
Vout Over / Undershoot
100µs typ. / 200µs max.
100mV max.
continued on next page
2ADC R-521.2PA/DA R-521.8PA/DA R-522.5PA/DA R-523.3PA/DA R-525.0PA/DA
3ADC R-531.2PA/DA R-531.8PA/DA R-532.5PA/DA R-533.3PA/DA R-535.0PA/DA
4ADC R-541.2PA/DA R-541.8PA/DA R-542.5PA/DA R-543.3PA/DA R-545.0PA/DA
5ADC R-551.2PA/DA R-551.8PA/DA R-552.5PA/DA R-553.3PA/DA R-555.0PA/DA
Vout nom. 1.2VDC 1.8VDC 2.5VDC 3.3VDC 5.0VDC
Vout adj. R1 R2 R1 R2 R1 R2 R1 R2 R1 R2
1.3 37kΩ3.7kΩ750Ω
1.5 11.5kΩ10kΩ2.1KΩ390Ω
1.6 8.2kΩ18kΩ3.0KΩ750Ω
1.7 6.5kΩ41kΩ4.1KΩ1.2kΩ
1.8 5.2kΩ5.6KΩ1.7kΩ
1.9 4.3kΩ36kΩ7.5KΩ2.2kΩ
2.0 3.6kΩ1.8kΩ10.5KΩ2.8kΩ
2.4 2.1kΩ5.2kΩ82KΩ6.8kΩ
2.5 1.8kΩ4.3kΩ8.5kΩ
2.6 1.65kΩ3.6kΩ33kΩ10.5kΩ
3.0 1.05kΩ2.1kΩ6.2kΩ33kΩ470Ω
3.2 1.65kΩ4.1kΩ110kΩ1.6kΩ
3.3 1.5kΩ3.4kΩ2.2kΩ
3.4 1.35kΩ2.9kΩ36kΩ3.0kΩ
3.6 1.07kΩ2.2kΩ11kΩ4.7kΩ
3.9 780Ω1.4kΩ4.7kΩ8.5kΩ
4.5 390Ω650Ω1.6Ω30kΩ
4.9 350Ω820Ω220kΩ
5.0 290Ω680Ω
5.1 220Ω560Ω28kΩ
5.5 39Ω190Ω2.6kΩ
Trim Tables or Calculation
Notes:
Note5: Operation below 10% load will not harm the converter, but specifications may not be met
Note6: Requires a 100µF electronic or tantalum output capacitpr for proper operation in all applications
(the capacitor has to be placed as close as possible to the output pins):
100µF for R-52xxx, R-53xx and R-54xx, 220µF for R-55xx
www.recom-power.com REV.: 4/2018 I-5
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
Load Regulation
R-53xx / R-54xx
R-53xx / R-54xx
R-52xx / R- 55xx
R-52xx / R- 55xx
Line Regulation
2.0
0
1.0
1.5
0.5
Load Regulation [%]
Input Voltage [V]
0
5.0
10 15 18
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
1
0
0.5
Line Regulation [%]
Output Voltage [V]
1.2 1.8 2.3 3.3 5.0
2.0
0
1.0
1.5
0.5
Load Regulation [%]
Input Voltage [V]
0
5.0
10 15 18
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
1
0
0.5
Line Regulation [%]
Output Voltage [V]
1.2 1.8 2.3 3.3 5.0
PROTECTIONS
Parameter Condition Value
Short Circuit Protection (SCP) continuous, automatic recovery
Short Circuit Input Current 50mA max.
continued on next page
www.recom-power.com REV.: 4/2018 I-6
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Type
Value
Material case
potting
non-conducive black plastic, (UL94 V-0)
epoxy, (UL94 V-0)
Dimension (LxWxH) 32.2 x 9.1 x 15.0mm
Weight 9g typ.
continued on next page
ENVIRONMENTAL
Parameter Condition
Value
Operating Temperature Range without derating @ natural convection 0.1m/s -40°C to +85°C
Maximum Case Temperature +110°C
Thermal Impedance @ natural convection 0.1m/s 25°C/W
Operating Humidity non-condensing 95% RH max.
Operating Altitude 2000m
Pollution Degree PD2
MTBF according to MIL-HDBK 217F, G.B. +25°C
+85°C
749 x 103 hours
150 x 103 hours
Optional Diode Protection Circuit
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. Protection diodes are
required for high capacitive loads.
The diode can either be fitted across
the divice, if the source is low imped-
ance or fitted in series with the output
(recommended). R1: Trim output voltage up to 1 diode drop
R-5/6/7xxx
+Vin +Vout
D1
GND GND
+Vin +Vout
GND
R-5/6/7xxx
D1
R1
+Vin +Vout
GND GND
+Vin +Vout
GND Vadj
Optional Protection 1: Optional Protection :
SAFETY AND CERTIFICATIONS
Certificate Type (Safety) Report / File Number Standard
Information Technology Equipment, General Requirements for Safety
1605077-12 IEC60950-1:2005, 2nd Edition + AM2:2013
EN60950-1:2006 + AM2:2013
EAC
RU-AT.49.09571 TP TC 004/2011
RoHS 2+ RoHS-2011/65/EU + AM-2015/863
www.recom-power.com REV.: 4/2018 I-7
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
INSTALLATION AND APPLICATION
continued on next page
C1
C2
Q1
1µF
(Optional)
100µF
ESR= 150mΩ max.
(Required)
+Vin +Vout
Vadj
GND
ON/OFF
+Vin
Com Com
+Vout
Rdown
Rup
R-5xxxPA_DA
OFF
ON
VCTRL
Standard Application Circuit
Dimension Drawing (mm)
Pin Connections
Pin # Single Description
1 ON/OFF Input pin: Active low (less than 0.8V) to disable the device
2,3,4 Vin Power Input
5, 6, 7, 8 GND Input and Output ground (common)
9, 10 Vout Power output
11 Vout (Auto Sense) If unused this pin must be connected to Pin 9 and 10
12 Vadj With external resistors R1, R2 to selected output voltage
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
Bottom View
Top View
1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12
2.54
2.54
9.1
32.2
11 x 2.54 = 27.94
0.8
0.70+0.10/-0.05 0.25±0.05
15.04.10
Marking
embossed logo
2.1
Bottom View Top View
1 2 3 4 5 6 7 8 9 10 11 12
1 2 3 4 5 6 7 8 9 10 11 12
2.54
2.54
32.2
15.0
9.117.0
2.1
11 x 2.54 = 27.94
0.70+0.10/-0.05 0.25±0.05
Recommended Footprint Details
Recommended Footprint Details
R-5xxxPA
R-5xxxDA
Add blocking diode to Vout if current can flow backwards into the output, as this can damage the converter.
(Please refer to “Optional Diode Protection Circuit” on page I-6)
www.recom-power.com REV.: 4/2018 I-8
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
PACKAGING INFORMATION
Parameter Type Value
Packaging Dimensions (LxWxH) R-5xxxDA
R-5xxxPA
520.0 x 20.0 x 19.0mm
530.0 x 23.0 x 19.0mm
Packaging Quantity tube 15pcs
Storage Temperature Range -40°C to +125°C
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.
Parallel Application Circuit
Component side Solder side
The R-52xx, R-53xx, R-54xx series can be used in parallel to upgrade the output current capacity for the same output voltage.
For example, the R-543.3PA can parallel up with another R-554.3PA to give up to 8 amps or with the R-533.3PA or R-23-3PA
types to give output currents of up to 7 amps or 6 amps. The R-55xx series cannot be paralleled.
12
11
10
9
1
2
3
4
1
2
3
4
5 6 7 8
12
11
10
9
5 6 7 8
ON/OFF
Control
Com
Com
Vout
C1
100µF/25V
(REQ´D)
C2-1
100µF/10V
(REQ´D)
C2-2
100µF/10V
(REQ´D)
U2
must be connected
U1
Keep 2mm to 5mm distance
between both converters
U1
1 12
U2
112
U1
C2-1
C2-2
To Load
Com
Com
+Vout
Sense
C1
U2112
112
+Vin