R-555.0PA (RECOM)
DC/DC-Converter

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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%
DC/DC Converter
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.
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
2,3,4,5 Amp
SIP12
Vertical &
Horizontal
Single Output
IEC/EN60950-1 certified
Notes:
Note1: Vin-Vout 1.5V~4.0V depending on Vout if adjust function is used
Note2: please refer to basic characteristics
Model Numbering
R-5_ __ xA
Output Current (A)
nom. Output Voltage
Pinning (3)
Notes:
Note3: x can be „P“= vertical through hole
x can be „D“ = bent for horizontal through hole mounting
Ordering Examples:
R-553.3PA Iout= 5A
R-522.5DA Iout= 2A
nom. Vout= 3.3VDC P= vertical through hole
nom. Vout= 2.5VDC D= bent for horizontal through hole mounting
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REV.: 4/2018
I-1


R-555.0PA (RECOM)
DC/DC-Converter

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R-5xxxPA_DA
DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
Series
BASIC CHARACTERISTICS
Parameter
Quiescent Current
Internal Power Dissipation
Output Current Limit
Minimum Load
ON/OFF CTRL (4)
Input Current of CTRL Pin
Internal Operating Frequency
Output Ripple and Noise
Maximum Capacitive Load
Condition
min. Vin to max.
ta<60°C
R-52xx
R-53xx
R-54xx
R-55xx
DC-DC ON
DC-DC OFF
DC-DC OFF
R-52xx
R-53xx & R-54xx & R-55xx
normal start-up time, no external diodes
<1 second start-up time + diode protection circuit
Min.
10%
270kHz
Typ.
2.5A
3.75A
5.0A
6.0A
Max.
20mA
1.4W
3.0A
4.25A
5.5A
6.5A
Open or high, 4.5V min. / 18V max.
Low (Power OFF) 0.8V max.
100µA
300kHz
330kHz
40mVp-p
80mVp-p
70mVp-p
120mVp-p
300µF
6800µF
Notes:
Note4: ON/OFF pin driven by TTL (logic gate), open-collector bipolar transistor or open-drain MOSFET
How to calculate the max output current
The internal power dissipiation (PD ) follows the equation:
PD= Iout x Vout x (1-Effmax Vin )
Iout=
PD
Vout x (1-Effmax Vin )
100
85
80
60
40
20
Example: R-545.0P
Calculation 1:
Vin = 18V
Vout = 5V
Effmax Vin = 93%
PD = 1.4W
TAmbient = 60°C
Iout=
1.4W
5V x (1-0.93 )
= 4.0A
0
0 0.5 1 1.4
Internal Power Dissipation [W]
Calculation 2:
Vin = 18V
Vout = 5V
Effmax Vin = 93%
PD = 1W
TAmbient = 85°C
Iout=
1W
5V x (1-0.93 )
= 2.857A
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Calculation 3:
Vin = 12V
Effmax Vin = 94%
PD = 1.0W
TAmbient = 85°C
Iout=
1W
5V x (1-0.94 )
continued on next page
REV.: 4/2018
= 3.33A
I-2


R-555.0PA (RECOM)
DC/DC-Converter

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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
Efficiency vs. Load
100
R-53xx / R-54xx / R-55xx
min. Vin
95
90
85
80
75
70
0.1
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
123
Output Load [A]
4
5
R-5xxxPA_DA
Series
R-52xx
min. Vin
100
95
90
85
80
75
70
0.1
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
0.5 1
1.5
Output Load [A]
2
R-53xx / R-54xx / R-55xx
Vin=18V
100
95
R-52xx
Vin=18V
100
90
90 80
85 70
80
75
70
0.1 1
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
23
Output Load [A]
4
5
60
50
40
0.1
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
0.5 1 1.5
Output Load [A]
2
Trim Tables or Calculation
2ADC
3ADC
4ADC
5ADC
R-521.2PA/DA
R-531.2PA/DA
R-541.2PA/DA
R-551.2PA/DA
Vout nom.
Vout adj.
0.8
0.9
1.0
1.1
1.2
1.2VDC
R1 R2
740Ω
3.9kΩ
13kΩ
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R-521.8PA/DA
R-531.8PA/DA
R-541.8PA/DA
R-551.8PA/DA
1.8VDC
R1 R2
R-522.5PA/DA
R-532.5PA/DA
R-542.5PA/DA
R-552.5PA/DA
2.5VDC
R1 R2
1.05kΩ
2.1kΩ
270Ω
continued on next page
REV.: 4/2018
R-523.3PA/DA
R-533.3PA/DA
R-543.3PA/DA
R-553.3PA/DA
3.3VDC
R1 R2
R-525.0PA/DA
R-535.0PA/DA
R-545.0PA/DA
R-555.0PA/DA
5.0VDC
R1 R2
I-3


R-555.0PA (RECOM)
DC/DC-Converter

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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
Trim Tables or Calculation
2ADC
3ADC
4ADC
5ADC
R-521.2PA/DA
R-531.2PA/DA
R-541.2PA/DA
R-551.2PA/DA
R-521.8PA/DA
R-531.8PA/DA
R-541.8PA/DA
R-551.8PA/DA
Vout nom.
Vout adj.
1.3
1.5
1.6
1.7
1.8
1.9
2.0
2.4
2.5
2.6
3.0
3.2
3.3
3.4
3.6
3.9
4.5
4.9
5.0
5.1
5.5
1.2VDC
R1 R2
37kΩ
11.5kΩ
8.2kΩ
6.5kΩ
5.2kΩ
4.3kΩ
3.6kΩ
2.1kΩ
1.8kΩ
1.65kΩ
1.05kΩ
1.8VDC
R1 R2
3.7kΩ
10kΩ
18kΩ
41kΩ
36kΩ
1.8kΩ
5.2kΩ
4.3kΩ
3.6kΩ
2.1kΩ
1.65kΩ
1.5kΩ
1.35kΩ
1.07kΩ
780Ω
390Ω
R-5xxxPA_DA
Series
R-522.5PA/DA
R-532.5PA/DA
R-542.5PA/DA
R-552.5PA/DA
2.5VDC
R1 R2
750Ω
2.1KΩ
3.0KΩ
4.1KΩ
5.6KΩ
7.5KΩ
10.5KΩ
82KΩ
33kΩ
6.2kΩ
4.1kΩ
3.4kΩ
2.9kΩ
2.2kΩ
1.4kΩ
650Ω
350Ω
290Ω
220Ω
39Ω
R-523.3PA/DA
R-533.3PA/DA
R-543.3PA/DA
R-553.3PA/DA
3.3VDC
R1 R2
390Ω
750Ω
1.2kΩ
1.7kΩ
2.2kΩ
2.8kΩ
6.8kΩ
8.5kΩ
10.5kΩ
33kΩ
110kΩ
36kΩ
11kΩ
4.7kΩ
1.6Ω
820Ω
680Ω
560Ω
190Ω
R-525.0PA/DA
R-535.0PA/DA
R-545.0PA/DA
R-555.0PA/DA
5.0VDC
R1 R2
470Ω
1.6kΩ
2.2kΩ
3.0kΩ
4.7kΩ
8.5kΩ
30kΩ
220kΩ
28kΩ
2.6kΩ
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation (5)
Transient Response (6)
Condition
low line to high line, full load
R-52xx
R-53xx & R-54xx & R-55xx
10% to 100%, full load
R-52xx
R-53xx & R-54xx & R-55xx
50% load step change
Vout Over / Undershoot
Value
±1.0% typ. / ±2.0% max.
±0.25% typ. / ±0.5% max.
±0.5% typ. / ±1.0% max.
±0.5% typ. / ±1.0% max.
±1.0% typ. / ±2.0% max.
100µs typ. / 200µs max.
100mV max.
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
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continued on next page
REV.: 4/2018
I-4


R-555.0PA (RECOM)
DC/DC-Converter

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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
Line Regulation
1
R-53xx / R-54xx
R-5xxxPA_DA
Series
R-52xx / R- 55xx
1
0.5 0.5
0
1.2 1.8 2.3 3.3 5.0
Output Voltage [V]
Load Regulation
2.0
1.5
1.0
0.5
0
0
R-53xx / R-54xx
5.0 10
Input Voltage [V]
5Vout
3.3Vout
2.5Vout
1.8Vout
1.2Vout
15 18
0
1.2 1.8 2.3 3.3 5.0
Output Voltage [V]
R-52xx / R- 55xx
2.0
5Vout
3.3Vout
2.5Vout
1.5 1.8Vout
1.2Vout
1.0
0.5
0
0 5.0 10 15 18
Input Voltage [V]
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
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Condition
continued on next page
REV.: 4/2018
Value
continuous, automatic recovery
50mA max.
I-5


R-555.0PA (RECOM)
DC/DC-Converter

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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
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.
Optional Protection 1:
D1
+Vin +Vin R-5/6/7xxx +Vout
GND
Optional Protection :
+Vout
+Vin
+Vin R-5/6/7xxx +Vout
GND Vadj
+Vout
D1
The diode can either be fitted across
the divice, if the source is low imped-
ance or fitted in series with the output
(recommended).
GND
R1
GND GND
GND
R1: Trim output voltage up to 1 diode drop
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Thermal Impedance
Operating Humidity
Operating Altitude
Pollution Degree
MTBF
Condition
without derating @ natural convection 0.1m/s
@ natural convection 0.1m/s
non-condensing
according to MIL-HDBK 217F, G.B.
+25°C
+85°C
Value
-40°C to +85°C
+110°C
25°C/W
95% RH max.
2000m
PD2
749 x 103 hours
150 x 103 hours
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC
RoHS 2+
Report / File Number
1605077-12
RU-AT.49.09571
Standard
IEC60950-1:2005, 2nd Edition + AM2:2013
EN60950-1:2006 + AM2:2013
TP TC 004/2011
RoHS-2011/65/EU + AM-2015/863
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Dimension (LxWxH)
Weight
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Type
case
potting
continued on next page
REV.: 4/2018
Value
non-conducive black plastic, (UL94 V-0)
epoxy, (UL94 V-0)
32.2 x 9.1 x 15.0mm
9g typ.
I-6


R-555.0PA (RECOM)
DC/DC-Converter

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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
Dimension Drawing (mm)
32.2
R-5xxxPA_DA
Series
R-5xxxDA
32.2
embossed logo
9.1
2.1 0.70+0.10/-0.05
11 x 2.54 = 27.94
1 2 3 4 5 6 7 8 9 10 11 12
Bottom View
0.25±0.05
Recommended Footprint Details
Top View
1 2 3 4 5 6 7 8 9 10 11 12
2.54
R-5xxxPA
Marking
2.1 0.70+0.10/-0.05
Bottom View
1 2 3 4 5 6 7 8 9 10 11 12
11 x 2.54 = 27.94
0.25±0.05
Recommended Footprint Details
1 2 3 4 5 6 7 8 9 10 11 12
Top View
2.54
Pin Connections
Pin #
Single
1
ON/OFF
2,3,4
Vin
5, 6, 7, 8
GND
9, 10
Vout
11 Vout (Auto Sense)
12
Vadj
Description
Input pin: Active low (less than 0.8V) to disable the device
Power Input
Input and Output ground (common)
Power output
If unused this pin must be connected to Pin 9 and 10
With external resistors R1, R2 to selected output voltage
Tolerance:
xx.x= ±0.5mm
xx.xx= ±0.25mm
INSTALLATION AND APPLICATION
Standard Application Circuit
+Vin
OFF 1µF
ON (Optional)
C1
VCTRL
+Vin +Vout
R-5xxxPA_DA
ON/OFF GND
Vadj
Q1
Com
Rdown
Rup
+Vout
C2
100µF
ESR= 150mmax.
(Required)
Com
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)
continued on next page
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REV.: 4/2018
I-7


R-555.0PA (RECOM)
DC/DC-Converter

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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-5xxxPA_DA
Series
Parallel Application Circuit
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.
ON/OFF
Control
Com
1
2
3
45
U1
67
C1
100µF/25V
(REQ´D)
12
11
10
89
C2-1
100µF/10V
(REQ´D)
45
3
2
1
67
U2
C2-2
100µF/10V
(REQ´D)
89
10
11
12
Vout
Com
must be connected
together
Component side
1 12 U1
1 12 U2
Keep 2mm to 5mm distance
between both converters
Solder side
12
C1
C2-1
12
C2-2
1
U1
1 U2
To Load
PACKAGING INFORMATION
Parameter
Packaging Dimensions (LxWxH)
Packaging Quantity
Storage Temperature Range
Type
R-5xxxDA
R-5xxxPA
tube
Value
520.0 x 20.0 x 19.0mm
530.0 x 23.0 x 19.0mm
15pcs
-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.
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REV.: 4/2018
I-8




R-555.0PA.pdf
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