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Features
Switching
Regulator
• Non-isolated
• Synchronous rectification design
• Adjustable output voltage
• 2, 3, 4Amp adjustable positive step down
Integrated switching regulator
• Over load protection
• Continuous short circuit protection
• Efficiency up to 97%
DC/DC Converter
R-7xxxP_D
Description
The R-7xxx series is a high performance 2.5V to 17V, 2Amp to 4Amp, 12-Pin SIP (single in-line
package), integrated switching regulator (ISR). The synchronous - rectified design yields excellent
efficiencies up to 97%. Short circuit protection reduces the short circuit input current to under 50mA.
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] [%] [%] [µF]
R-723.3x 4.5 - 28 3.3 2.5 - 5.5
2
95 89
200/6800
R-725.0x 6.5 - 28 5.0 3.0 - 5.5
2
96 91
200/6800
R-726.5x 8.5 - 28 6.5 5.0 - 8.0
2
97 93
200/6800
R-729.0x 12 - 28 9.0 7.0 - 11
R-7212x 15 - 28 12 10 - 14
R-7215x 19 - 28 15 13 - 17
2
2
2
96
97
97
93
95
96
200/6800
200/6800
200/6800
R-733.3x 4.5 - 28 3.3 2.5 - 5.5
3
94 89
200/6800
R-735.0x 6.5 - 28 5.0 3.0 - 5.5
R-736.5x 8.5 - 28 6.5 5.0 - 8.0
R-739.0x 12 - 28 9.0 7.0 - 11
3
3
3
95
97
96
92
93
94
200/6800
200/6800
200/6800
R-7312x 15 - 28 12 10 - 14
R-7315x 19 - 28 15 13 - 17
R-743.3x 4.5 - 28 3.3 2.5 - 5.5
3
3
4
97
97
93
96
96
88
200/6800
200/6800
200/6800
R-745.0x 6.5 - 28 5.0 3.0 - 5.5
4
95 91
200/6800
R-746.5x 8.5 - 28 6.5 5.0 - 7.5
4
96 93
200/6800
Notes:
Note1: Vin-Vout 1.5V~4.0V depending on Vout if adjust function is used
Note2: Please refer to basic characteristics on page I-2
2,3,4 Amp
SIP12
Vertical &
Horizontal
Single Output
IEC/EN60950-1 certified
Model Numbering
R-7_ __ x
Output Current (A)
nom. Output Voltage
Pinning (3)
Notes:
Note3: x can be „P“ = vertical through hole
x can be „D“ = bent pins for horizontal through hole mounting
Ordering Examples:
R-723.3P Iout= 2A
R-7312D Iout= 3A
nom. Vout= 3.3VDC P= vertical through hole
nom. Vout= 12VDC D= horizontal through hole
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R-7xxxP_D
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-72xxx
R-73xxx
R-74xxx
DC-DC ON
DC-DC OFF
DC-DC OFF
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
Max.
30mA
1.4W
3.0A
4.25A
5.5A
Open or high, 4.5V min. / 28V max.
Low (Power OFF) 0.8V max.
100µA
300kHz
330kHz
40mVp-p
70mVp-p
200µF
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:
100
85
80
PD= Iout x Vout x (1-Effmax Vin )
60
Iout=
PD
Vout x (1-Effmax Vin )
Example: R-745.0P
Calculation 1:
Vin = 28V
Vout = 5V
Effmax Vin = 91%
PD = 1.4W
TAmbient = 60°C
Iout=
1.4W
5V x (1-0.91 )
= 3.11A
Calculation 3:
Vin = 12V
Effmax Vin = 94%
PD = 1.0W
TAmbient = 85°C
40
20
0
0 0.5 1 1.4
Internal Power Dissipation [W]
Calculation 2:
Vin = 28V
Vout = 5V
Effmax Vin = 91%
PD = 1.0W
TAmbient = 85°C
Iout=
1W
5V x (1-0.91 )
= 2.222A
Iout=
1W
5V x (1-0.94 )
= 3.33A
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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
Efficiency vs. Load
R-72xx / R-73xx / R-74xx
max. Vin
100
90
80
70
60
50
15Vout
5Vout
3.3Vout
40
01 2 3 4
Output Current [A]
Efficiency vs. Input Voltage
R-72xx / R-73xx
100
90
80
70
60
50
40
30
15Vout
20 6.5Vout
10
5Vout
3.3Vout
0
0 5 10 15 20
Input Voltage [VDC]
25
28
R-7xxxP_D
Series
100
95
90
85
80
75
70
0
R-72xx / R-73xx / R-74xx
min. Vin
6.5Vout
5Vout
3.3Vout
12
3
Output Current [A]
4
100
90
80
70
60
50
40
30
20
10
0
0
R-74xx
6.5Vout
5Vout
3.3Vout
5 10 15 20
Input Voltage [VDC]
25
28
Ripple vs. Input Voltage
R-72xx / R-73xx
50
45
40
35
30
25
20
15
10
15Vout
6.5Vout
12Vout
5Vout
5
9Vout
3.3Vout
0
0 5 10 15 20
Input Voltage [VDC]
25
28
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R-74xx
100
90
80
70
60
50
40
30
20 6.5Vout
5Vout
10 3.3Vout
0
0 5 10 15 20 25 28
Input Voltage [VDC]
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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
R-7xxxP_D
Series
Trim Table
2ADC
3ADC
4ADC
R-723.3P/D
R-733.3P/D
R-743.3P/D
R-725.0P/D
R-735.0P/D
R-745.0P/D
R-726.5P/D
R-736.5P/D
R-746.5P/D
R-729.0P/D
R-739.0P/D
R-7212P/D
R-7312P/D
R-7215P/D
R-7315P/D
Vout nom.
Vout adj.
2.5
3.0
3.2
3.3
3.4
3.6
3.9
4.5
4.9
5.0
5.1
5.5
6.0
6.5
7.0
7.5
8.0
9.0
10
11
12
13
14
15
16
17
3.3VDC
R1 R2
8.5kΩ
33kΩ
110kΩ
36kΩ
11kΩ
4.7kΩ
1.6kΩ
820Ω
680Ω
560Ω
190Ω
5.0VDC
R1 R2
470kΩ
1.6kΩ
2.2kΩ
3.0kΩ
4.7kΩ
8.5kΩ
30kΩ
220kΩ
28kΩ
2.6kΩ
6.5VDC
R1 R2
11kΩ
12kΩ
20kΩ
47kΩ
4.5kΩ
2.2kΩ
9.0VDC
R1 R2
13kΩ
31kΩ
2.2kΩ
390Ω
12VDC
R1 R2
20kΩ
47kΩ
2.4kΩ
390Ω
15VDC
R1 R2
36kΩ
76kΩ
2.6kΩ
860Ω
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation (5)
Transient Response (6)
Condition
full load
low line to high line, full load
10% to 100%, full load
50% load step change
Vout Over / Undershoot
Value
±1.0% typ. / ±2.0% max.
± 0.5% typ. / ±1.0% max.
± 0.5% typ. / ±1.0% 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 electrolytic or tantalum output capacitor for proper operation in all applications
(the capacitor has to be placed as close as possible to the output pins)
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DC/DC Converter
Specifications (refer to standard application circuit, Ta= 25°C)
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
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.
Condition
Optional Protection 1:
D1
+Vin +Vin R-5/6/7xxx +Vout
GND
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
R-7xxxP_D
Series
Value
continuous, automatic recovery
50mA typ. / 100mA max.
Optional Protection :
+Vout
+Vin
+Vin R-5/6/7xxx +Vout
GND Vadj
+Vout
D1
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
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REV.: 5/2018
Standard
IEC60950-1:2005, 2nd Edition + AM2:2013
EN60950-1:2006 + AM2:2013
TP TC 004/2011
RoHS-2011/65/EU + AM-2015/863
I-5