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R-78AA5.0-1.0SMD Datasheet Preview

R-78AA5.0-1.0SMD Datasheet

DC/DC Converter

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Features
Switching
Regulator
• Efficiency up to 94%, no need for heatsinks
• High reflow temperature SMD package
• Adjustable output voltage buck converter
• Short circuit protection, thermal shutdown
• Remote on/off control
• Very low shutdown current
DC/DC Converter
R-78AA-1.0
Description
The R-78AAxx-1.0SMD series are adjustable output non-isolated buck converters that meet the
requirements for RoHS 10/10 as well as the reflow soldering temperatures associated with va-
por phase soldering, making these high efficiency switching regulators ideally suited to modern
pick-and-place mass production. The efficiency of up to 97% means that very little energy
is wasted as heat. The additional features of remote on/off control, continuous short circuit protection
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
Part
Number
Input Output Vout Output Efficiency
Voltage Range Voltage Adjust Range Current @ min Vin @ max. Vin
[VDC] [VDC] [VDC] [mA] [%] [%]
R-78AA1.5-1.0SMD 4.75 - 18
1.5
fixed
1.0
77
73
R-78AA1.8-1.0SMD 4.75 - 18
1.8
1.5 - 3.0
1.0
82
76
R-78AA2.5-1.0SMD 4.75 - 18
2.5
1.5 - 3.0
1.0
87
81
R-78AA3.3-1.0SMD 4.75 - 18
3.3
3.0 - 5.5
1.0
90
84
R-78AA5.0-1.0SMD 6.5 - 18
5.0
3.0 - 5.5
1.0
94
89
Notes:
Note1: Input voltage ranges valid for nominal output voltages
Vin must be higher than Vout including adjust range and dropout voltage
Model Numbering
R-78AA__-1.0SMD-_
nom. Output Voltage
Output Current
Packaging (2)
Package
EN60950-1 certified
IEC60950-1 certified
Notes:
Note2: 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
www.recom-power.com
REV.: 5/2019
I-1




RECOM

R-78AA5.0-1.0SMD Datasheet Preview

R-78AA5.0-1.0SMD Datasheet

DC/DC Converter

No Preview Available !

R-78AA-1.0
DC/DC Converter
Specifications (measured @ Ta= 25°C, 10% minimum load, unless otherwise stated)
Series
BASIC CHARACTERISTICS
Parameter
Quiescent Current
Internal Power Dissipation
Output Voltage Adjustability
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
Condition
Min. Typ. Max.
Vin= min. to max.
5mA 7mA
0.4W
see calculation
0%
ON/OFF CTRL
50ms
DC-DC ON
DC-DC OFF
DC-DC OFF
Open or 2.8VDC<Vr<5VDC
GND or 0VDC<Vr<0.8VDC
1.8µA
20µA 35µA
2.4VDC
2.6VDC
2.8VDC
250mV
335kHz
385kHz
435kHz
20MHz BW
20mVp-p
30mVp-p
with normal start-up time, no external components
470µF
with <1 second start-up time + diode protection circuit
6800µF
Notes:
Note3: Operation under no load will not harm the converter, but specifications may not be met.
A minimum load of 10mA is recommended
Output Voltage Adjustability
Adjustment Resistor Values
R1 R2 R3 Vref(V)
1.8V 10KΩ 21KΩ 5.6KΩ 1.23
2.5V 22KΩ 21KΩ 5.6KΩ 1.23
3.3V 16.9KΩ 10KΩ 5.6KΩ 1.23
5.0V 30.9KΩ 10KΩ 10KΩ 1.23
+VIN
R2(R1 + R3) x (Vref - Vo) + Vref x R1R3
Trim down Rdown =
R2Vo - Vref (R1 + R2)
GND
Controlled IC
R1
R2 R3
+VOUT
Vadj
GND
Vref
Rdown
Rup
Trim up
R2R3 (Vref - Vo) + Vref R1 (R2 + R3)
Rup =
R2 (Vo - Vref) - Vref R1
100
90
80
70
60
50
40
30
20
10
0
4.75
Efficiency vs. Vin (full load)
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
7 9 11 13 15
Input Voltage [VDC]
www.recom-power.com
17 18
50
45
40
35
30
25
20
15
10
5
0
4.75
continued on next page
REV.: 5/2019
Ripple vs. Vin (full load)
5Vout
3.3Vout
2.5Vout
1.8Vout
1.5Vout
7 9 11 13 15
Input Voltage [VDC]
17 18
I-2


Part Number R-78AA5.0-1.0SMD
Description DC/DC Converter
Maker RECOM
Total Page 6 Pages
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