Features
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Replacement for R-78Axx-1.0SMD series
RoHS 6/6 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
INNOLINE
DC/DC-Converter
with 3 year Warranty
Description
The R-78AAxx-1.0SMD series are manufactured without lead and meet the requirements for RoHS 6/6 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 volta-
ges will find many uses in the battery-powered, industrial, medical and automotive markets.
Selection Guide
Part
Number
SMD
Input
Range
(V)
Output
Voltage
(V)
1.5
1.8
2.5
3.3
5.0
Adjust
Range
(V)
fixed
1.5~3.0
1.5~3.0
3.0~5.5
3.0~5.5
Output
Current
(A)
1.0
1.0
1.0
1.0
1.0
Efficiency
Min. Vin Max. Vin
(%)
(%)
77
82
87
90
94
73
76
81
84
89
1.0 AMP
SMD
Single Output
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
* add suffix -R for tape&reel packing e.g.
R-78AA5.0-1.0-R
. For more details see Application Notes.
Specifications
( typical at 25°C, 10% minimum load, unless otherwise specified )
Characteristics
Conditions
Min.
Typ.
Max.
Input Voltage Range
See Table
4.75V
18.0V
Output Voltage Range
See Table
1.5V
5.5V
Output Current
All Series
0mA*
1000mA
Short Circuit Input Current
Vin = 12V
120mA
Internal Power Dissipation
0.4W
Short Circuit Protection
Continuous, automatic recovery
Output Voltage Accuracy
100% Load
±2%
±3%
Adjustable Voltage Range
See Table 1
±50%
Line Voltage Regulation (Vin = min to max at full load)
0.2%
0.4%
Load Regulation (10% to 100% full load)
0.7%
1.0%
Dynamic Load Stability
100%<>50% load, 25mA/µs
±85mV ±100mV
Ripple & Noise (20MHz BW)
20mVp-p 30mVp-p
Temperature Coefficient
-40°C~+85°C ambient
0.015%/°C
Max capacitance Load with normal start-up time, no external components
470µF
with <1 second start up time + diode protection circuit
6800µF
Switching Frequency
335kHz
385kHz 435kHz
Quiescent Current
Vin = min. to max. at 0% load
5mA
7mA
ON/OFF Remote Control Pin Drive Current
ON: Open or 1.6V<Vr<5V
OFF: GND or 0<Vr<1.6V
Ir=1.8µA typ
Converter Input Current (valid for Vr < 1.6V)
20µA
35µA
Remote On/Off Threshold Voltage (Vr rising)
2.4V
2.6V
2.8V
Remote On/Off Voltage Hysteresis
250mV
Operating Temperature Range
-40°C
+85°C
Switch On/Off Time
(using Remote On/Off Control)
50ms
Operating Case Temperature
+100°C
Storage Temperature Range
-55°C
+125°C
Case Thermal Impedance
70°C / W
continued on next page
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REV: 2/2016
2011/65/EU
6/6
RoHS
IEC/EN-60950-1 Certified
R-78AA-1.0
Derating-Graph
(Ambient Temperature)
120
100
80
60
40
30
20
0
-40
Output Power (%)
Safe Operating Area
0
25
50
Operating Temperature (°C)
60
85
75 100
I-15
INNOLINE
DC/DC-Converter
Case Material
EMC
Conducted Emissions (with filter)
Radiated Emissions (with filter)
ESD
Radiated Immunity
Fast Transient
Conducted Immunity
Magnetic Field Immunity
R-78AAxx-1.0 SMD
Series
EN55022
EN55022
EN61000-4-2
EN61000-4-3
EN61000-4-4
EN61000-4-6
EN61000-4-8
Non-Conductive Black Plastic
Class B
Class B
Class A
Class A
Class A
Class A
Class A
IEC/EN-60950-1, 2nd Edition + AM:2
1.7g
33 pcs per Tube
250 pcs per Reel
13338~21070 x 10³ hours
using MIL-HDBK 217F
3880~6769 x 10³ hours
Specifications
( typical at 25°C, 10% minimum load, unless otherwise specified )
Certifications
IEC/EN General Safety
Package Weight
Packing Quantity
MTBF (+25°C)
.
(+71°C)
Report: LVD 1603123
}
Detailed Information see
Application Notes chapter "MTBF"
*Note: Operation under no load will not damage these devices, however they may not meet all specifications. A minimum load of 10mA is recommended
Characteristics
Efficiency
100
90
80
Vo=5V
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
50
25
Ripple
Vo=5V
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
5
10
15
18
Efficiency (%)
70
60
5
10
15
18
R-78AA-1.0
Ripple (mV)
Vin ( V )
Efficiency Vs
Vin (Full Load)
100
90
80
70
60
50
Vo=5V
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
50
Vin ( V )
Ripple Vs
Vin ( Full Load )
25
Vo=5V
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
0.2
0.4
0.6
0.8
1.0
1.2
Efficiency (%)
25
0.2
0.4
0.6
0.8
1.0
1.2
Ripple (mV)
Output Current ( A )
Efficiency Vs
Load ( Vin=Max )
100
90
80
70
60
50
Vo=5V
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
50
Output Current ( A )
Ripple Vs
Load ( Vin=Max )
25
Efficiency (%)
25
Ripple (mV)
Vo=5V
Vo=3.3V
Vo=2.5V
Vo=1.8V
Vo=1.5V
0.2
0.4
0.6
0.8
1.0
1.2
0.2
0.4
0.6
0.8
1.0
1.2
Output Current ( A )
Efficiency Vs
Load ( Vin=Min )
Output Current ( A )
Ripple Vs
Load ( Vin=Min )
I-16
REV: 2/2016
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INNOLINE
DC/DC-Converter
Standard Application Circuit
R-78AAxx-1.0 SMD
Series
1,2
+Vin
R-78Axx-1.0 SMD
6
4,5
+Vout
R
up
R
down
On/Off
10 3,7,8,9
GND
GND
Application Examples
3.3V/5V Selectable 1A Power Supply
+Vin
R-78A3.3-1.0SMD
Vout = 3.3V
or 5.0V @ 1A
On/Off
GND
3.3V/5V
Select
(TTL)
6.8kW
GND
R-78AA-1.0
4.7kW
Optional Protection Circuit
Optional Protection 1:
Add a blocking diode to Vout
if current can flow back-
wards 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 out-
put (recommended)
.
Optional Protection 2:
+Vin
R-78A(A)xx
-xxxSMD
+Vout
+Vin
R-78A(A)xx
-xxxSMD
Diode
Trim output voltage
up 1 diode drop
GND
+Vout
CTRL
CTRL
GND
GND
GND
+Vin
R-78xx-xx
+Vout
Application example:
Driving a high capacitive load
6800µF
GND
GND
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REV: 2/2016
I-17
INNOLINE
DC/DC-Converter
Table 1: Adjustment Resistor Values
R1
1.8V
2.5V
3.3V
5.0V
10KΩ
22KΩ
16.9KΩ
30.9KΩ
R2
R-78AAxx-1.0 SMD
Series
R3
5.6KΩ
5.6KΩ
5.6KΩ
10KΩ
Vref(V)
1.23
1.23
1.23
1.23
21KΩ
21KΩ
10KΩ
10KΩ
+V
in
R1
Controlled IC
R2
GND
R3
+V
o
R
down
Vadj
R
up
GND
Vref
R
2
(R
1
+R
3
) x (V
ref
- V
o
) + V
ref
x R
1
R
3
Trim Down
R
down
=
R
2
V
o
- V
ref
(R
1
+ R
2
)
R
2
R
3
(V
ref
- V
o
) + V
ref
R
1
(R
2
+ R
3
)
Trim up
R
up
=
R
2
(V
o
- V
ref)
R-78AA-1.0
-
V
ref R
1
Package Style and Pinning (mm)
SMD 10Pin Package
15.30
15.00
8.80
2.54x4
0.50
Bottom View
9.60
9.40
9.24
12.35
10 9 8 7 6
RECOM
R-78AAxx-1.0SMD
xxxx
1 2 3 4 5
Pin Connections
Pin #
1,2
+Vin
3,7,8,9
GND
4,5
+Vout
6
V adj
10 Remote On/Off
xx.x ±0.5mm
xx.xx ±0.25mm
Recommended Footprint Details
13.00
1.30
10 9 8 7 6
Top View
1 2 3 4 5
1.80
2.54
1.20
The product information and specifications are subject to change without prior notice. RECOM products are not authorized for use in safety-critical applications (such as life support) without RECOM’s explicit
written consent. A safety-critical application is defined as an application where a failure of a RECOM product may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The buyer
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.
I-18
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