Features
●
●
●
●
●
●
Efficiency up to 94%, Non isolated,
no need for heatsinks
SMD Package (UL94V-0 Material )
Adjustable Output Voltage
Short circuit protection, Thermal shutdown
Remote On/Off Control
Very Low Shutdown Current
INNOLINE
DC/DC-Converter
Description
The R-78Axx-1.0SMD series high efficiency switching regulators are ideally suited to pick-and-place mass production.
The efficiency of up to 94% means that very little energy is wasted as heat. remote on/off control and adjustable output
voltage are useful additional features of this versatile SMD converter series.
Selection Guide
Part
Number
SMD
R-78A1.8-1.0SMD
R-78A2.5-1.0SMD
R-78A3.3-1.0SMD
R-78A5.0-1.0SMD
Input
Range (1)
(V)
4.75 – 18
4.75 – 18
4.75 – 18
6.5 – 18
Output
Voltage
(V)
1.8
2.5
3.3
5.0
Adjust
Range
(V)
1.5~3.3
1.5~4.5
1.8~5.5
2.5~5.5
Output
Current
(A)
1.0
1.0
1.0
1.0
Efficiency
Min. Vin Max. Vin
(%)
(%)
82
87
91
94
71
77
81
86
1.0 AMP
SMD
Single Output
Specifications
( typical at 25°C, 10% minimum load, unless otherwise specified )
Characteristics
Input Voltage Range
Output Voltage Range
Output Current
Output Current Limit
Short Circuit Input Current (Vin = 12V)
Internal Power Dissipation
Short Circuit Protection
Output Voltage Accuracy (At 100% Load)
Adjustable Voltage Range
Load Regulation (10% to 100% full load)
Dynamic Load Stability
Ripple & Noise (20MHz BW)
Temperature Coefficient
Max capacitance Load
Switching Frequency
Quiescent Current
Vin = min. to max. at 0% load
ON/OFF Remote Control Pin Drive Current
Converter Input Current (valid for Vr < 1.6V)
Remote On/Off Threshold Voltage (Vr rising)
Remote On/Off Voltage Hysteresis
Operating Temperature Range
Switch On/Off Time
Operating Case Temperature
Storage Temperature Range
Case Thermal Impendance
Thermal Shutdown
Internal IC junction
-55°C
-40°C
(using Remote On/Off Control)
2.4
20
2.6
250mV
+85°C
50ms
+100°C
+125°C
70°C / W
+160°C
cont.
www.recom-international.com
REV:0/2009
280
350
5
-40°C~+85°C ambient
100%<>50% load
All Series
See Table 1
0.2
0.7
±2
Conditions
See Table
See Table
All Series
All Series
All Series
Min.
4.75
1.5
0*
Typ.
Max.
18.0V
5.5V
1000mA
3000mA
100mA
0.4W
Continuous, automatic recovery
±3%
±50%
0.4%
1.0%
EN-55022 Certified
EN-55024 Certified
EN-60601-1-2 Certified
EN-60950-1 Certified
R-78A-1.0
Line Voltage Regulation (Vin = min to max at full load)
±85mV ±100mV
20mVp-p 30mVp-p
0.015%/°C
220µF
430kHz
7mA
Ir=1.8µA typ
35µA
2.8V
Output Power (%)
Derating-Graph
(Ambient Temperature)
120
100
80
60
40
30
20
0
-40
Safe Operating Area
0
25
50
Operating Temperature (°C)
60
85
75
100
I-19
INNOLINE
DC/DC-Converter
Standard Application Circuit
R-78Axx-1.0 SMD
Series
+Vin
1,2
R-78Axx-1.0 SMD
6
4,5
+Vout
R1
R2
On/Off
10 3,7,8,9
-Vin
-Vout
IMPORTANT INFORMATION: The R-78Ax.x-x.xSMD series are not suitable to be soldered using vapour phase soldering, they are only guaranteed to be safe in IR
or convection reflow ovens and by hand soldering. Reflow conditions should not exceed the limits of the Jedec STD-020C profile. This restriction applies to the
product series R-78Ax.x-0.5SMD, R-78Ax.x-1.0SMD and RCD-24B-0.70/SMD only and does not affect any other RECOM products. For more details regarding
this matter please contact info@recom-development.at
Application Examples
3.3V/5V Selectable 1A Power Supply
+Vin
R-78A3.3-1.0SMD
Vout = 3.3V
or 5.0V @ 1A
R-78A-1.0
On/Off
-Vin
3.3V/5V
Select
(TTL)
6.8kW
Com
4.7kW
Optional 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).
Optional Protection 2:
+Vin
R-78A(A)xx
-xxxSMD
+Vout
+Vin
R-78A(A)xx
-xxxSMD
Diode
Trim output voltage
up 1 diode drop
+Vout
CTRL
CTRL
-Vin
-Vout
-Vin
-Vout
www.recom-international.com
REV:0/2009
I-21
INNOLINE
DC/DC-Converter
Table 1: Adjustment Resistor Values
1.0Adc
Vout (nom.)
Vout (adj)
1.5 (V)
1.8 (V)
2.5 (V)
3.0 (V)
3.3 (V)
3.6 (V)
3.9 (V)
4.5 (V)
4.9 (V)
5.0 (V)
5.1 (V)
5.5 (V)
11.8KΩ
4.64KΩ
44.2KΩ
R1
3KΩ
R-78A1.8-1.0SMD
1.8Vdc
R2
R1
200Ω
12KΩ
R-78A2.5-1.0SMD
2.5Vdc
R2
R-78Axx-1.0 SMD
Series
R-78A3.3-1.0SMD
3.3Vdc
R1
R2
R1
R-78A5.0-1.0SMD
5.0Vdc
R2
88.4KΩ
17KΩ
27KΩ
60.4KΩ
28KΩ
11.3KΩ
7.15KΩ
6.34KΩ
5.9KΩ
3.9kΩ
231KΩ
56.2KΩ
42KΩ
58KΩ
180KΩ
850KΩ
Package Style and Pinning (mm)
R-78A-1.0
3rd angle
projection
SMD 10Pin Package
15.24
14.84
7.05
1.65
9.00
2.54x4
9.30
9.00
10 9 8 7 6
RECOM
R-78Axx-1.0SMD
xxxx
8.60
10.00
11.80
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
0.55
Bottom View
13.00
1.20
10 9 8 7 6
Top View
1 2 3 4 5
1.80
2.54
1.20
* add suffix -R for tape & reel packing e.g.
R-78A5.0-1.0-R
. For more details see Application Notes
I-22
REV: 0/2009
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