1.0 AMP
SMD
Single Output
INNOLINE
DC/DC-Converter
R-78Axx-
1.0SMD
Series
Efficiency up to 94%,Non isolated,
no need for heatsinks
SMD Package (UL94V-0 Material )
Adjustable Output Voltage
Wide input range.(4.75V ~ 18V)
Short circuit protection, Thermal shutdown
Remote On/Off Control
Very Low Shutdown Current
Features
Selection Guide
Part
Input
Output
Adjust
Output
Efficiency
Number
Range (1)
Voltage
Range
Current
Min. Vin Max. Vin
SMD
(V)
(V)
(V)
(A)
(%)
(%)
R-78A1.8-1.0SMD
4.75 18
1.8
1.5~3.3
1.0
82
71
R-78A2.5-1.0SMD
4.75 18
2.5
1.5~4.5
1.0
87
77
R-78A3.3-1.0SMD
4.75 18
3.3
1.8~5.5
1.0
91
81
R-78A5.0-1.0SMD
6.5 18
5.0
2.5~5.5
1.0
94
86
Output Power (%)
120
100
20
60
100
75
0
-40
Operating Temperature (°C)
0
80
50
25
60
Safe Operating Area
85
40
30
Characteristics
Conditions
Min.
Typ.
Max.
Input Voltage Range (Note 1)
See Table
4.75
18.0V
Output Voltage Range
See Table
1.5
5.5V
Output Current
All Series
0
1000mA
Output Current Limit
All Series
3000mA
Short Circuit Input Current
All Series
30mA
Internal Power Dissipation
0.4W
Short Circuit Protection
Continuous, automatic recovery
Output Voltage Accuracy (At 100% Load)
All Series
±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
±85mV ±100mV
Ripple & Noise (20MHz BW)
20mVp-p 30mVp-p
Temperature Coefficient
-40°C~+85°C ambient
0.015%/°C
Max capacitance Load
220µF
Switching Frequency
280
350
430kHz
Quiescent Current Vin = min. to max. at 0% load
5
7mA
Shutdown Current
20
35µA
Remote On/Off Threshold Voltage
2.4
2.6
2.6V
ON/OFF Remote Control ON: Open or 1.6<Vr<5V, OFF: GND or 0<Vr<1.6V Ir=1.8uA typ.
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 Impendance
70°C / W
Thermal Shutdown
Internal IC junction
+160°C
Package Weight
2.7g
MTBF (+25°C)
using MIL-HDBK 217F
13338 x 10³ hours
. (+71°C)
using MIL-HDBK 217F
3880 x 10³ hours
Specifications
( typical at 25°C, 10% minimum load, unless otherwise specified )
Derating-Graph
(Ambient Temperature)
}
Detailed Information see
Application Notes chapter "MTBF"
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.
Description
07-May-2007
151
www.recom-international.com
* add suffix -R for tape&reel packing e.g.
R-78A5.0-1.0-R
. For more details and dimensi-
ons of the tapes and reels see page 334 to 336.
152
www.recom-international.com
07-May-2007
Efficiency (%)
50
5
Efficiency Vs Vin (Full Load)
Vo=1.8V
Vo=2.5V
Vo=5V
Vo=3.3V
25
Vin ( V )
10
15
18
75
100
Efficiency (%)
100
0.2
Efficiency Vs Load ( Vin=Max )
Vo=1.8V
Vo=3.3V
Vo=5V
Vo=2.5V
50
Output Current ( A )
0.4
0.6
0.8
1.0
1.2
75
25
Efficiency (%)
100
0.2
Efficiency Vs Load ( Vin=Min )
Vo=1.8V
Vo=3.3V
Vo=5V
Vo=2.5V
50
Output Current ( A )
0.4
0.6
0.8
1.0
1.2
75
25
Ripple (mV)
50
5
Ripple Vs Vin ( Full Load )
Vo=1.8V
Vo=2.5V
Vo=5V
Vo=3.3V
25
Vin ( V )
10
15
18
Ripple (mV)
50
0.2
Ripple Vs Load ( Vin=Max )
Vo=1.8V
Vo=2.5V
Vo=5V
Vo=3.3V
25
Output Current ( A )
0.4
0.6
0.8
1.0
1.2
Ripple (mV)
50
0.2
Ripple Vs Load ( Vin=Min )
Vo=1.8V
Vo=2.5V
Vo=5V
Vo=3.3V
25
Output Current ( A )
0.4
0.6
0.8
1.0
1.2
R-78Axx-1.0 SMD
-Vout
+Vout
+Vin
-Vin
1,2
10 3,7,8,9
6
4,5
R1
R2
On/Off
Efficiency
Ripple
Standard Application Circuit
Characteristics
INNOLINE
DC/DC-Converter
R-78Axx-1.0 SMD
Series
Add a blocking diode to
Vout if current can flow
backwards into the out-
put, as this can damage
the converter..
See Application
Examples for details.
www.recom-international.com
153
07-May-2007
Application Examples
INNOLINE
DC/DC-Converter
+Vin
-Vin
R-78A3.3-1.0SMD
Vout = 3.3V
or 5.0V @ 1A
Com
6.8kW
On/Off
3.3V/5V Selectable 1A Power Supply
3.3V/5V
Select
(TTL)
4.7kW
R-78Axx-1.0 SMD
Series
+Vin
-Vin
R-78A5.0-1.0
+5V@1A
C1
C3
REC10-4812SRWZ/H
- Improved loading / line regulation
- Wide Input Voltage Range - 18~75V
C3,C4 : optional
- Point-of-Load Architecture
- High isolation voltage - 1.6kV
R-78A3.3-1.0
0V
+3.3V@1A
C4
+12V@0.1A
R1
On/Off
On/Off
- Power Sequencing - Low voltage supplies
turn on after 12V supply has stabilised.
Z1
0V
C2
- Further decoupling filtering may be necessary
between the converters
