• Designed For 4-20mA Loop Operation And Energy
Scavenging Applications
• Open Frame SMD Design
Features
DC/DC Converter
• -40°C to +105°C Operating Temperature @ Full Load
• Continuous Short Circuit Protection
• No Minimum Load Required
Switching
Regulator
R420-1.8/PL
Low
Current
• 5000m Operating Altitude
Description
The R420 has been designed for auxiliary power from 4-20mA loops and other low power budget
applications that require a maximum input current <3.6mA. This low profile SMD converter delivers
a regulated, short-circuit protected output that can be adjusted between 1.8V and 5V with a single
external resistor and delivers three times the output current of equivalent linear regulators to power
microprocessors, data-loggers and HART digital modems without affecting the analog 4-20mA signal.
The R420 will also find many applications in energy scavenging and indoor solar powered circuits.
3
Regulator
Selection Guide
Part
Number
Input
Voltage Range
Adjustable Output
Voltage Range
Output
Current
(mA)
Efficiency Max. Capacitive
typ. (1)
(%)
Load (2)
(µF)
(VDC)
(VDC)
R420-1.8/PL
10-36
1.8-5.0
10
76
1000
Notes:
Note1: Efficiency is tested at 10-36VDC, full load and +25°C ambient.
Note2: Max cap load is tested at nominal input and full resistive load.
EN60950-1 Certified
EN55022 Certified
Model Numbering
R420-1.8/PL__
Packaging (3)
Notes:
Note3: add suffix “-R” for Tape and Reel Packaging
Ordering Examples:
R420-1.8/PL, Standard Tray Packaging (40pcs/Tray)
R420-1.8/PL-R, Tape and Reel Packaging (400pcs/T&R)
Specifications (measured @ ta= 25°C, full load, nominal input voltage and after warm-up)
BASIC CHARACTERISTICS
Parameter
Condition
Min.
Typ.
Max.
Internal Input Filter
Input Voltage Range
Quiescent Current
1µF Capacitor
nom. Vin= 24V
10VDC
24VDC
0.5mA
36VDC
1mA
DC-DC ON
DC-DC OFF
6VDC
5VDC
Under Voltage Lockout
Output Voltage Trimming
Minimum Load
with 3.75kW
5VDC
0%
DC-DC ON
DC-DC OFF
Open or 2V<Vr<5V
Short or 0V<Vr<0.2Vr
ON/OFF CTRL
Internal Operating Frequency
Output Ripple and Noise
45kHz
50kHz
52kHz
20MHz BW, 0-100% load
30mVp-p
continued on next page
www.recom-power.com
REV.: 1/2017
I-1
RECOM [ RECOM INTERNATIONAL POWER ]
