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13-February-2007
1.0 AMP
SIP3
Single Output
INNOLINE
DC/DC-Converter
R-78Bxx-
1.0(L)
Series
●Efficiency up to 97%,Non isolated,
no need for heatsinks
●Pin-out compatible with LM78XX Linears
●Low profile( L*W*H=11.5*8.5*17.5mm)
●Wide input range.(4.75V ~ 34V)
●Short circuit protection, Thermal shutdown
●Non standard outputs available as specials
between 1.5V ~15V
●Low ripple and noise
●“L” version with 90° pins
●See Positive to Negative Converter
Application Note for use as a voltage
inverter (alternative to LM79xx Linear)
Features
Selection Guide
Part Input Output Output Efficiency
Number Range (1) Voltage Current Min. Vin Max. Vin
SIP3 (V) (V) (A) (%) (%)
R-78B1.5-1.0 4.75 – 26 1.5 1.0 77 71
R-78B1.8-1.0 4.75 – 26 1.8 1.0 80 74
R-78B2.5-1.0 4.75 – 34 2.5 1.0 85 78
R-78B3.3-1.0 4.75 – 34 3.3 1.0 89 83
R-78B5.0-1.0 6.5 – 34 5.0 1.0 93 88
R-78B6.5-1.0 9.0 – 34 6.5 1.0 94 90
R-78B9.0-1.0 12 – 34 9.0 1.0 95 93
R-78B12-1.0 16 – 34 12 1.0 96 95
R-78B15-1.0 20 – 34 15 1.0 97 96
Output Power (%)
120
100
20
60
100750
-40
Operating Temperature (°C)
0
80
5025
71
Safe Operating Area
85
40
Derating-Graph
(Ambient Temperature)
The R-78Bxx-Series high efficiency switching regulators are ideally suited to replace 78xx linear regulators
and are pin compatible. The efficiency of up to 97% means that very little energy is wasted as heat so there
is no need for any heat sinks with their additional space and mounting costs. The L-Version with 90° pins
allows direct replacement for laid-flat regulators where component height is at a premium. Low ripple and
noise figures and a short circuit input current of typically only 10mA round off the specifications of this ver-
satile converter series.
Description
* add Suffix “L” for 90° bent pins, e.g. R-78B5.0-1.0L
Note 1: 1.5V, 1.8V Output can be unstable with Vin>26VDC
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13-February-2007
Characteristics Conditions Min. Typ. Max.
Input Voltage Range 1.5V, 1.8V 4.75 26.0V
2.5V to 15.5V 4.75 34.0V
Output Voltage Range (for customized parts) All Series 1.5 15.5V
Output Current (see Note 2) All Series 0 1000mA
Output Current Limit All Series 2000mA
Short Circuit Input Current All Series 10 30mA
Internal Power Dissipation 0.65W
Short Circuit Protection Continuous, automatic recovery
Output Voltage Accuracy (At 100% Load) All Series ±2 ±3%
Line Voltage Regulation (Vin = min. to max. at full load) 1.5V to 6.5V 0.2 0.4%
9V to 15.5V 0.1 0.2%
Load Regulation (10% to 100% full load) 1.5V to 6.5V 0.4 0.6%
9V to 15.5V 0.25 0.4%
Dynamic Load Stability (with Output Capacitor=100µF) 100% <-> 50% load ±100mV ±150mV
Transient Recovery Time 1.0 1.5ms
Ripple & Noise (without Output Capacitor) 1.5V to 6.5V 15mVp-p 20mVp-p
(10% to 100% full load) 9V to 15.5V 25mVp-p 35mVp-p
Temperature Coefficient -40°C ~ +85°C ambient 0.015%/°C
Max capacitance Load 220µF
Switching Frequency 280 330 380kHz
Quiescent Current Vin = min. to max. at 0% load 5 7mA
Input Reflected Ripple Current All Series 150 200mAp-p
Operating Temperature Range -40°C +85°C
Operating Case Temperature +100°C
Storage Temperature Range -55°C +125°C
Case Thermal Impendance 60°C / W
Thermal Shutdown Internal IC junction +160°C
Relative Humidity 95% RH
MTBF (+25°C) using MIL-HDBK 217F 6584 x 10³ hours
. (+71°C) using MIL-HDBK 217F 1139 x 10³ hours
Note 2: Converter requires a minimum load of 6mA to start up properly. Once started, the load can be reduced to 0%.
R-78Bxx-1.0
(L) Series
Specifications (refer to the standard application circuit, Ta: 25°C, minimum load = 10%)
INNOLINE
DC/DC-Converter
Standard Application Circuit
R-78Bxx-1.0
-Vout
+Vout
+Vin
-Vin
C1
22µF
(Vin>30V)
100µF
(Option)
C2
To protect the converter during power-up, use C1=22µF if Vin>30V
}Detailed Information see
Application Notes chapter "MTBF"
Add a blocking diode to
Vout if current can flow
backwards into the out-
put, as this can damage
the converter..
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13-February-2007
INNOLINE
DC/DC-Converter
Characteristics
Efficiency (%)
50
Efficiency Vs
Vin (Full Load)
Vo=1.8V Vo=2.5V
Vo=5V
Vo=3.3V
25
Vin ( V )
10 20 34
75
100
Vo=1.5V
Vo=12V
Vo=15V
Vo=9V
Vo=6.5V
Efficiency
Efficiency (%)
100
0.2
Efficiency Vs
Load ( Vin=Max )
Vo=1.5V
Vo=3.3V
Vo=5V
Vo=2.5V
50
Output Current ( A )
0.4 0.6 0.8 1.0 1.2
75
25
Vo=1.8V
Vo=15V
Vo=12V
Vo=6.5V
Vo=9V
Efficiency (%)
100
0.2
Efficiency Vs
Load ( Vin=Min )
Vo=1.5V
Vo=3.3V
Vo=5V
Vo=2.5V
50
Output Current ( A )
0.4 0.6 0.8 1.0 1.2
75
25
Vo=1.8V
Vo=15V
Vo=12V
Vo=9V, 6,5V
Ripple (mV)
50
Ripple Vs
Vin ( Full Load )
Vo=1.5V,1.8V
Vo=2.5V
Vo=5V
Vo=3.3V
25
Vin ( V )
10 20 34
Vo=9V,12V
Vo=15V
Vo=6.5V
Ripple
Ripple (mV)
50
0.2
Ripple Vs
Load ( Vin=Max )
Vo=1.5V, 1.8V
Vo=2.5V
Vo=5V
Vo=3.3V
25
Output Current ( A )
0.4 0.6 0.8 1.0 1.2
Vo=9V, 12V
Vo=15V
Vo=6.5V
Ripple (mV)
50
0.2
Ripple Vs
Load ( Vin=Min )
Vo=1.5V,1.8V
Vo=2.5V,3.3V,5V
Vo=9V,12V,15V
25
Output Current ( A )
0.4 0.6 0.8 1.0 1.2
Vo=6.5V
R-78Bxx-1.0
(L) Series
2.54
2.54
Top View
Bottom View
8.50
2.0
0.25
5.08
3.21
213
4.10
0.51 typ.
0.7 typ.
17.5
RECOM
R-78B5.0-1.0
****
Pb
1.00ø+0.15/0
11.50
RECOM
R-78B5.0-1.0
****
Pb
8.50
4.10
1.50 max
Application Examples
INNOLINE
DC/DC-Converter
Package Style and Pinning (mm)
3rd angle
projection
SIP3 PIN Package
+Vin
-Vin
R-78B5.0-1.0
-12V@84mA
+12V@84mA
0V Com
C1 C2
RD-0512D
- +/-12V outputs for analogue circuits, e.g. instrumentation amplifier
- Wide input range 6.5V to 34V
C1: optional, C2: required (further
decoupling filtering may be necessary
between the two converters)
+5V@0.4A
- +5V output for digital circuits
+Vin
-Vin
R-78B5.0-1.0 +5V@1A
C1
C2
REC10-4812SRWZ/H
- Improved loading / line regulation
- Wide Input Voltage Range - 18~75V C2,C3 : optional
- Point-of-Load Architecture
- High isolation voltage - 1.6kV
R-78B3.3-1.0
0V
+3.3V@1A
C3
+12V@0.1A
- C1 is required. Further decoupling filtering
may be necessary between the converters
R-78Bxx-1.0
(L) Series
High efficiency multiple output
Isolated, wide Input range, Distributed Power Architecture (Point of Load)
Pin Connections
Pin #
1 +Vin
2 GND
3 +Vout
xx.x ±0.5mm
xx.xx ±0.25mm
Recommended Footprint Details
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L - Version
