Features
Switching
Regulator
Description
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
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
Number
R-723.3x
R-725.0x
R-726.5x
R-729.0x
R-7212x
R-7215x
R-733.3x
R-735.0x
R-736.5x
R-739.0x
R-7312x
R-7315x
R-743.3x
R-745.0x
R-746.5x
Input
Output
Vout
Output
Voltage Range Voltage Adjust Range
(1)
Current
[VDC]
[VDC]
[VDC]
[A]
4.5 - 28
3.3
2.5 - 5.5
2
6.5 - 28
5.0
3.0 - 5.5
2
8.5 - 28
6.5
5.0 - 8.0
2
12 - 28
9.0
7.0 - 11
2
15 - 28
12
10 - 14
2
19 - 28
15
13 - 17
2
4.5 - 28
3.3
2.5 - 5.5
3
6.5 - 28
5.0
3.0 - 5.5
3
8.5 - 28
6.5
5.0 - 8.0
3
12 - 28
9.0
7.0 - 11
3
15 - 28
12
10 - 14
3
19 - 28
15
13 - 17
3
4.5 - 28
3.3
2.5 - 5.5
4
6.5 - 28
5.0
3.0 - 5.5
4
8.5 - 28
6.5
5.0 - 7.5
4
Efficiency
Max. Capacitive
@ min Vin @ max. Vin
Load
(2)
[%]
[%]
[µF]
95
89
200/6800
96
91
200/6800
97
93
200/6800
96
93
200/6800
97
95
200/6800
97
96
200/6800
94
89
200/6800
95
92
200/6800
97
93
200/6800
96
94
200/6800
97
96
200/6800
97
96
200/6800
93
88
200/6800
95
91
200/6800
96
93
200/6800
2,3,4 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 on page I-2
Model Numbering
R-7_ __ x
Output Current (A)
nom. Output Voltage
Notes:
Note3: x can be „P“ = vertical through hole
x can be „D“ = bent pins for horizontal through hole mounting
Pinning
(3)
Ordering Examples:
R-723.3P
Iout= 2A
R-7312D
Iout= 3A
nom. Vout= 3.3VDC
nom. Vout= 12VDC
P= vertical through hole
D= horizontal through hole
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REV.: 5/2018
I-1
R-7xxxP_D
DC/DC Converter
Specifications
(refer to standard application circuit, Ta= 25°C)
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
normal start-up time, no external diodes
<1 second start-up time + diode protection circuit
Notes:
Note4: ON/OFF pin driven by TTL (logic gate), open-collector bipolar transistor or open-drain MOSFET
DC-DC ON
DC-DC OFF
DC-DC OFF
270kHz
300kHz
40mVp-p
Series
Condition
min. Vin to max.
ta<60°C
R-72xxx
R-73xxx
R-74xxx
10%
Open or high, 4.5V min. / 28V max.
Low (Power OFF) 0.8V max.
100µA
330kHz
70mVp-p
200µF
6800µF
2.5A
3.75A
5.0A
Min.
Typ.
Max.
30mA
1.4W
3.0A
4.25A
5.5A
Ambient Temperature [°C]
How to calculate the max output current
The internal power dissipiation (P
D
) follows the equation:
P
D
=
Iout x Vout x (1-Eff
max Vin
)
100
85
80
60
40
20
0
Iout=
P
D
Vout x (1-Eff
max Vin
)
0
0.5
1
1.4
Internal Power Dissipation [W]
Example:
R-745.0P
Calculation 1:
Vin = 28V
Vout = 5V
Eff
max Vin
= 91%
P
D
= 1.4W
T
Ambient
= 60°C
Calculation 2:
Vin = 28V
Vout = 5V
Eff
max Vin
= 91%
P
D
= 1.0W
T
Ambient
= 85°C
Iout=
1.4W
5V x (1-0.91 )
= 3.11A
Iout=
1W
5V x (1-0.91 )
= 2.222A
Calculation 3:
Vin = 12V
Eff
max Vin
= 94%
P
D
= 1.0W
T
Ambient
= 85°C
Iout=
1W
5V x (1-0.94 )
= 3.33A
continued on next page
www.recom-power.com
REV.: 5/2018
I-2
R-7xxxP_D
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
100
95
Series
R-72xx / R-73xx / R-74xx
min. Vin
Efficiency [%]
80
70
60
50
40
15Vout
5Vout
3.3Vout
Efficiency [%]
90
85
80
75
70
6.5Vout
5Vout
3.3Vout
0
1
2
3
4
0
1
2
3
4
Output Current [A]
Output Current [A]
Efficiency vs. Input Voltage
R-72xx / R-73xx
100
90
80
70
60
50
40
30
20
10
0
0
5
15Vout
6.5Vout
5Vout
3.3Vout
R-74xx
100
90
80
70
60
50
40
30
20
10
0
6.5Vout
5Vout
3.3Vout
Efficiency [%]
10
15
20
25
28
Efficiency [%]
0
5
10
15
20
25
28
Input Voltage [VDC]
Input Voltage [VDC]
Ripple vs. Input Voltage
R-72xx / R-73xx
50
45
40
35
30
25
20
15
10
5
0
0
5
15Vout
12Vout
9Vout
6.5Vout
5Vout
3.3Vout
R-74xx
100
90
80
70
Ripple (mV)
Ripple (mV)
60
50
40
30
20
10
0
0
6.5Vout
5Vout
3.3Vout
10
15
20
25
28
5
10
15
20
25
28
Input Voltage [VDC]
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REV.: 5/2018
Input Voltage [VDC]
I-3
R-7xxxP_D
DC/DC Converter
Specifications
(refer to standard application circuit, Ta= 25°C)
Trim Table
2ADC
3ADC
4ADC
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
2.6kΩ
860Ω
2.4kΩ
390Ω
36kΩ
76kΩ
2.2kΩ
390Ω
20kΩ
47kΩ
4.5kΩ
2.2kΩ
31kΩ
13kΩ
36kΩ
11kΩ
4.7kΩ
1.6kΩ
820Ω
680Ω
560Ω
190Ω
28kΩ
2.6kΩ
R-723.3P/D
R-733.3P/D
R-743.3P/D
3.3VDC
R1
8.5kΩ
33kΩ
110kΩ
470kΩ
1.6kΩ
2.2kΩ
3.0kΩ
4.7kΩ
8.5kΩ
30kΩ
220kΩ
11kΩ
12kΩ
20kΩ
47kΩ
R2
R1
R-725.0P/D
R-735.0P/D
R-745.0P/D
5.0VDC
R2
R1
R-726.5P/D
R-736.5P/D
R-746.5P/D
6.5VDC
R2
R1
9.0VDC
R2
R1
12VDC
R2
R1
15VDC
R2
R-729.0P/D
R-739.0P/D
R-7212P/D
R-7312P/D
R-7215P/D
R-7315P/D
Series
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
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)
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.
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REV.: 5/2018
I-4
R-7xxxP_D
DC/DC Converter
Specifications
(refer to standard application circuit, Ta= 25°C)
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
Series
Condition
Value
continuous, automatic recovery
50mA typ. / 100mA max.
Optional Diode Protection Circuit
Optional Protection 1:
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).
D1
Optional Protection :
+V
in
+V
in
R-5/6/7xxx
GND
+V
out
+V
out
+V
in
+V
in
R-5/6/7xxx
GND
V
adj
+V
out
+V
out
D1
R1
GND
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
according to MIL-HDBK 217F, G.B.
+25°C
+85°C
@ natural convection 0.1m/s
non-condensing
Condition
without derating @ natural convection 0.1m/s
Value
-40°C to +85°C
+110°C
25°C/W
95% RH max.
2000m
PD2
749 x 10
3
hours
150 x 10
3
hours
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC
RoHS 2+
continued on next page
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REV.: 5/2018
I-5
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
微控制器 MCU
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