Features
Switching
Regulator
Description
•
•
•
•
•
•
RoHS 10/10 conform (100% lead free)
High reflow temperature SMD package
Adjustable output voltage
Short circuit protection, thermal shutdown
Remote ON/OFF control
very low shutdown current
DC/DC Converter
R-78AA-1.0
The R-78AAxx-1.0SMD series are manufactured without lead and meet the requirements for
RoHS 10/10 as well as the increased reflow soldering temperatures associated with vapor phase
soldering, making these high efficiency switching regulators ideally suited to modern pick-and-
place mass production. The efficiency of up to 94% 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.
1.0 Amp
SMD
Single Output
Selection Guide
Input
Voltage Range
[VDC]
R-78AA1.5-1.0SMD 4.75 - 18
R-78AA1.8-1.0SMD 4.75 - 18
R-78AA2.5-1.0SMD 4.75 - 18
R-78AA3.3-1.0SMD 4.75 - 18
R-78AA5.0-1.0SMD 6.5 - 18
Part
Number
Output
Voltage
[VDC]
1.5
1.8
2.5
3.3
5.0
Vout
Adjust Range
[VDC]
fixed
1.5 - 3.0
1.5 - 3.0
3.0 - 5.5
3.0 - 5.5
Output
Efficiency
Current @ min Vin
@ max. Vin
[mA]
[%]
[%]
1.0
77
73
1.0
82
76
1.0
87
81
1.0
90
84
1.0
94
89
Model Numbering
R-78AA__-1.0SMD-_
nom. Output Voltage
Output Current
Packaging
(1)
Package
EN60950-1 certified
IEC60950-1 certified
Notes:
Note1: add suffix -R for tape & reel packaging
Ordering Examples:
R-78AA5.0-1.0SMD-R = 5.0VDC Output Volage, 1.0A, SMD, tape and reel packaging
R-78AA2.5-1.0SMD = 2.5VDC Output Volage, 1.0A, SMD, tube
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REV.: 4/2018
I-1
R-78AA-1.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
BASIC CHARACTERISTICS
Parameter
Quiescent Current
Internal Power Dissipation
Trimming
Minimum Load
(2)
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
with normal start-up time, no external components
with <1 second start-up time + diode protection circuit
Notes:
Note2: Operation under no load will not harm the converter, but specifications may not be met.
A minimum load of 10mA is recommended
335kHz
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
385kHz
20mVp-p
435kHz
30mVp-p
470µF
6800µF
35µA
2.8VDC
Series
Condition
Vin= min. to max.
Min.
Typ.
5mA
Max.
7mA
0.4W
see calculation
Trimming
Adjustment Resistor Values
1.8V
2.5V
3.3V
5.0V
R1
10KΩ
22KΩ
16.9KΩ
30.9KΩ
R2
21KΩ
21KΩ
10KΩ
10KΩ
R3
5.6KΩ
5.6KΩ
5.6KΩ
10KΩ
Vref(V)
1.23
1.23
1.23
1.23
+V
IN
R1
+V
OUT
R
down
R3
V
adj
R
up
GND
Vref
Controlled IC
R2
GND
Trim down
Rdown =
R2(R1 + R3) x (Vref - Vo) + Vref x R1R3
R2Vo - Vref (R1 + R2)
R2R3 (Vref - Vo) + Vref R1 (R2 + R3)
R2 (Vo - Vref) - Vref R1
Trim up
Rup =
Efficiency vs. Vin (full load)
100
90
80
50
45
40
Ripple vs. Vin (full load)
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
4.75
7
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
9
11
13
15
17 18
Ripple [mV]
35
30
25
20
15
10
5
0
4.75
7
9
11
13
15
17 18
Input Voltage [VDC]
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continued on next page
REV.: 4/2018
Input Voltage [VDC]
I-2
R-78AA-1.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Efficiency vs. Load (max. Vin)
100
90
80
50
45
40
Series
Ripple vs. Load (max. Vin)
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
Efficiency [%]
Ripple [mV]
5Vout
3.3Vout
2.5Vout
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
50
45
40
Ripple vs. Load (min. Vin)
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
Efficiency [%]
70
60
50
40
30
20
10
0
0
10
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
20
30
40
50
60
70
80
90
100
Ripple [mV]
35
30
25
20
15
10
5
0
0
10
20
30
40
50
60
70
80
90
100
Output Load [%]
Output Load [%]
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
Transient Response
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Condition
full load
low line to high line, full load
10% to 100% load
25mA/µs
100% <-> 50% load
REV.: 4/2018
Value
±2.0% typ. / ±3.0% max.
±0.2% typ. / ±0.4% max.
±0.7% typ. / ±1.0% max.
±85mV typ. / ±100mV max.
I-3
R-78AA-1.0
DC/DC Converter
Specifications
(measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Short Circuit Input Current
nom. Vin= 12VDC
CTRL
Series
Condition
+V
in
+V
in
+V
out
Value
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.
The diode can either be fitted
across the device if the source is
low impedance or fitted in series
with the output (recommended).
CTRL GND
R-78AAxx
+V
out
continuous, automatic recovery
-1.0SMD
120mA max.
GND
+V
out
GND
Optional Protection 2:
+V
in
+V
in
+V
in
+V
in
R-78AAxx
-1.0SMD
CTRL GND
+V
out
+V
out
R-78AAxx
-1.0SMD
CTRL GND
V
adj
+V
out
CTRL
GND
+V
in
GND
CTRL
GND
Trim output voltage
up 1 diode drop
GND
+V
in
R-78AAxx
-1.0SMD
CTRL GND
V
adj
+V
out
+V
out
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Thermal Impedance
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
CTRL
GND
Trim output voltage
up 1 diode drop
Condition
with derating (see graph)
GND
Value
-40°C to +85°C
+100°C
±0.015%/°C
0.1m/s, horizontal
non-condensing
+25°C
+ 71°C
70°C/W
2000m
5% - 95% RH max.
PD2
13338 - 21070 x 10 hours
3880 - 6769 x 10
3
hours
3
according to MIL-HDBK-217F, G.B.
Derating Graph
100
90
80
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
85
Ambient Temperature [°C]
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REV.: 4/2018
I-4
R-78AA-1.0
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 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 B
EN61000-4-2
EN61000-4-3
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Dimension (LxWxH)
Weight
Type
case
PCB
Value
non-conductive black plastic, (UL94 V-2)
FR4, (UL94 V-1)
15.3 x 9.6 x 8.8mm
1.7g typ.
Dimension Drawing (mm)
15.3
9.6
Pinning information
15.0
9.4
0.50
±0.05
2.54 x 4
Recommended Footprint Details
Pin #
1,2
3,7,8,9
4,5
6
10
Tolerance:
xx.x= 0.5mm
xx.xx= ±0.25mm
Single
+Vin
GND
+Vout
Vadj
CTRL
10 9 8 7 6
2.54
1.30
Bottom View
12.35
Top View
1 2 3 4 5
1.80
1.20
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REV.: 4/2018
13.00
1 2 3 4 5
10 9 8 7 6
9.24
8.8
I-5
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