Features
Switching
Regulator
Description
•
•
•
•
•
•
•
Efficiency up to 95%, no need for heatsinks
High reflow temperature SMD package
Adjustable output voltage
Wide input range (4.74V - 32V)
Short circuit protection, thermal shutdown
Remote on/off control
very low shutdown current
DC/DC Converter
R-78AA-0.5
The R-78AAxx-0.5SMD series are manufactured without lead and meet the requirements for
RoHS 10/10 as well as the increased reflow soldering temperatures associated with va-
por phase soldering, making these high efficiency switching regulators ideally suited to modern
pick-and-place mass production. The efficiency of up to 97% means that very little energy
is wasted as heat. The additional features of remote on/off control and adjustable output
voltages will find many uses in the battery-powered, industrial, medical and automotive markets.
0.5 Amp
SMD
Single Output
Selection Guide
Part
Number
R-78AA1.5-0.5SMD
R-78AA1.8-0.5SMD
R-78AA2.5-0.5SMD
R-78AA3.3-0.5SMD
R-78AA5.0-0.5SMD
R-78AA6.5-0.5SMD
R-78AA9.0-0.5SMD
R-78AA12-0.5SMD
R-78AA15-0.5SMD
Input
Voltage Range
[VDC]
4.75 - 30
4.75 - 32
4.75 - 32
4.75 - 32
6.5 - 32
8.0 - 32
11 - 32
15 - 32
18 - 32
Output
Voltage
[VDC]
1.5
1.8
2.5
3.3
5.0
6.5
9.0
12
15
Vout
Adjust Range
[VDC]
fixed
1.5 - 3.0
1.5 - 3.0
3.0 - 5.5
3.0 - 8.0
3.3 - 11.0
4.5 - 12.6
4.5 - 12.6
fixed
Output
Current
[mA]
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
0.5
Efficiency
@ min Vin @ max. Vin
[%]
[%]
73
63
82
71
87
77
91
81
94
86
95
88
96
92
97
94
97
95
Notes:
Note1: 1.5VDC Output can be unstable with Vin>30VDC
Model Numbering
EN60950-1 certified
IEC60950-1 certified
R-78AA__-0.5 SMD-_
nom. Output Voltage
Output Current
Packaging
(2)
Package
Notes:
Note2: add suffix -R for tape & reel packaging
Ordering Examples:
R-78AA5.0-0.5SMD-R = 5.0VDC Output Volage, 0.5A, SMD, tape and reel packaging
R-78AA2.5-0.5SMD = 2.5VDC Output Volage, 0.5A, SMD, tube
www.recom-power.com
REV.: 4/2018
I-1
R-78AA-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS
Parameter
Absolut Maximum Input Voltage
Quiescent Current
Internal Power Dissipation
Trimming
Minimum Load
(3)
Start-up time
ON/OFF CTRL
Input Current of CTRL Pin
Standby Current
CTRL thereshold voltage
CTRL voltage hysterese
Internal Operating Frequency
Output Ripple and Noise
Maximum Capacitive Load
20MHz BW
1.5VDC tp 6.5VDC
9VDC to 15VDC
280kHz
2.4VDC
ON/OFF CTRL
DC-DC ON
DC-DC OFF
DC-DC OFF
0%
50ms
Open or 2.8VDC<Vr<5VDC
GND or 0VDC<Vr<0.8VDC
1.8µA
20µA
2.6VDC
250mV
330kHz
20mVp-p
30mVp-p
380kHz
30mVp-p
40mVp-p
470µF
6800µF
30µA
2.8VDC
Vin= min. to max.
5mA
Series
Condition
Min.
Typ.
Max.
34VDC
7mA
0.4W
see calculation
with normal start-up time, no external components
with <1 second start-up time + diode protection circuit
Notes:
Note3: Operation under no load will not harm the converter, but specifications may not be met.
A minimum load of 6mA is recommended
Trimming
Adjustment Resistor Values
V0
1.8V
2.5V
3.3V
5.0V
6.5V
9V
12V
R1
10kΩ
22kΩ
16.9kΩ
30.9kΩ
43kΩ
63.4kΩ
88.7kΩ
R2
21kΩ
21kΩ
10kΩ
10kΩ
10kΩ
10kΩ
10kΩ
R3
5.6kΩ
5.6kΩ
5.6kΩ
10kΩ
10kΩ
22.1kΩ
22.1kΩ
Vref(V)
1.23
1.23
1.23
1.23
1.23
1.23
1.23
Rdown =
R2(R1 + R3) x (Vref - Vo) + Vref x R1R3
R2Vo - Vref (R1 + R2)
Rup =
R2R3 (Vref - Vo) + Vref R1 (R2 + R3)
R2 (Vo - Vref) - Vref R1
+V
in
R1
+V
out
R
down
R3
V
adj
R
up
GND
Vref
Controlled IC
R2
GND
continued on next page
www.recom-power.com
REV.: 4/2018
I-2
R-78AA-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Vin (full load)
100
90
80
50
55
40
Series
Ripple vs. Vin (full load)
15Vout
12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
4.75
15, 12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
10
15
20
25
30 34
Efficiency [%]
45
30
25
20
15
10
5
0
4.75
10
15
20
25
30 34
Input Voltage [VDC]
Input Voltage [VDC]
Efficiency vs. Load (max. Vin)
100
90
80
50
45
40
Ripple vs. Load (max. Vin)
15Vout
12Vout
9Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
Efficiency [%]
Ripple [mV]
15Vout
12Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
0
10
20
30
40
50
60
70
80
90
100
70
60
50
40
30
20
10
0
35
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
Output Load [%]
Efficiency vs. Load (min. Vin)
100
90
80
20
25
Ripple vs. Load (min. Vin)
15Vout
12Vout
5Vout
3.3, 9Vout
1.8Vout
1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
80
15,12Vout
5Vout
3.3Vout
1.8Vout
1.5Vout
90
100
Ripple [mV]
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
www.recom-power.com
REV.: 4/2018
Output Load [%]
I-3
R-78AA-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
Transient Response
low line to high line
at full load
10% to 100% load
with a 100µF output
capacitor
Series
Condition
full load
1.5 VDC tp 6.5VDC
9VDC to 15VDC
1.5 VDC tp 6.5VDC
9VDC to 15VDC
100% <-> 50% load
100% <-> 10% load
+V
in
Value
±2.0% typ. / ±3.0% max.
±0.2% typ. / ±0.4% max.
±0.1% typ. / ±0.2% max.
±0.7% typ. / ±1.0% max.
±0.25% typ. / ±0.4% max.
±85mV typ. / ±100mV max.
±100mV typ.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
nom. Vin= 24VDC
CTRL
Condition
+V
in
continuous, automatic
CTRL GND
GND
R-78AAxx
-0.5SMD
+V
out
+V
out
Value
recovery
GND
60mA typ. / 100mA max.
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.
The diode can either be fitted
across the device if the source is
low impedance or fitted in series
with the output (recommended).
Optional Protection 1:
Optional Protection 2:
+V
in
+V
in
+V
in
+V
in
R-78AAxx
-0.5SMD
CTRL GND
+V
out
+V
out
R-78AAxx
-0.5SMD
CTRL GND
V
adj
+V
out
+V
out
CTRL
GND
+V
in
GND
CTRL
GND
Trim output voltage
up 1 diode drop
GND
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
+V
in
R-78AAxx
+V
-0.5SMD
CTRL GND
Condition
V
out
adj
+V
out
Value
-40°C to +85°C
+100°C
GND
with derating (see graph)
CTRL
GND
Trim output voltage
up 1 diode drop
±0.015%/°C
70°C/W
2000m
5% - 95% RH max.
PD2
0.1m/s, horizontal
non-condensing
according to MIL-HDBK-217F, G.B.
100
90
80
+25°C
+ 71°C
21098 - 29253 x 10
3
hours
4214 - 7365 x 10
3
hours
Derating Graph
Output Load [%]
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0 10 20 30 40 50 60 70 80 90 100
71 85
Ambient Temperature [°C]
www.recom-power.com
REV.: 4/2018
I-4
R-78AA-0.5
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Information Technology Equipment, General Requirements for Safety
EAC
RoHS 2+
Series
Report / File Number
1603123
RU-AT.49.09571
Standard
IEC60950-1:2005, 2nd Edition + AM 2:2013
EN60950-1:2006 + AM 2:2013
TP TC 004/2011
RoHS 2011/65/EU + AM2015/863
EMC Compliance
Electromagnetic compatibility of multimedia equipment -
Emission requirements
ESD Electrostatic discharge immunity test
Radiated, radio-frequency, electromagnetic field immunity test
Condition
with external filter
Air ±8kV; Contact ±4kV
3V/m
Standard / Criterion
EN55032, Class A and B
EN61000-4-2
EN61000-4-3
EMC Filtering Suggestions according to EN55032
L1
+V
in
C1
C2
+V
in
R-78AA-0.5SMD
GND
+V
out
+V
out
-V
in
-V
in
Component List Class A
MODEL
R78AA5.0-0.5SMD
C1
10µF MLCC 100V
C2
-
L1
3.9µH
Component List Class B
MODEL
R78AA5.0-0.5SMD
C1
10µF MLCC 100V
C2
10µF MLCC 100V
L1
5.6µH
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Dimension (LxWxH)
Weight
continued on next page
www.recom-power.com
REV.: 4/2018
I-5
Type
case
PCB
Value
non-conductive black plastic, (UL94 V-2)
FR4, (UL94 V-1)
15.3 x 9.6 x 8.8mm
2.7g typ.
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