The R-78S is a DC/DC boost converter designed to run from single cell batteries. The
input voltage range of 0.65V-3.3V means that alkaline, NiCd, NiMH, zinc-carbon or lithium
chemistry cells can be used to generate a stable 1.8V, 3.3V or 3.6V output to power microprocessors,
WLAN/Bluetooth modules and IoT systems. The very high efficiency and low standby consumption
can be used to extend battery lifetimes until the „last gasp“ to get the maximum available energy
out of the cell. The wide operating temperature of -40°C to +100°C, short circuit protection, OTP,
Class A EMC and 3-year warranty round off this high performance converter.
0.1 Amp
SIP4
Single Output
Selection Guide
Part
Number
R-78S1.8-0.1
R-78S3.3-0.1
R-78S3.6-0.1
Input
Voltage Range
(3)
[VDC]
0.65-1.3
0.65-3.15
0.65-3.3
Output
Voltage
[VDC]
1.8
3.3
3.6
Output
Current
[mA]
100
100
100
Efficiency
(1)
Max. Capacitive
@ min Vin @ typ. Vin
Load
(2)
[%]
[%]
[µF]
92
93
470
92
93
470
92
93
470
Notes:
Note1: Efficiency is tested at nom. input voltage and full load. (refer to Basic characterisitc below)
Note2: Max. Cap Load is tested by nominal input and full resistive load
Note3: For more information, please refer to “Line Derating” on page I-2
Model Numbering
R-78S-__-0.1
Output Voltage
Output Current
IEC/EN62368-1 certified
CB report, EAC
EN55032 compliant
Specifications
(measured @ Ta= 25°C,1.5Vin, full load and after warm-up unless otherwise stated)
BASIC CHARACTERISTICS
Parameter
Input Voltage
Under Voltage Lockout
Overload Capability
(4)
Quiescent Current
Condition
R-78S1.8-0.1
1.2VDC
R-78S3.3-0.1 nom. Vin= 1.5VDC
R-78S3.6-0.1
1.5VDC
DC-DC OFF
peak duty cycle 10%
Vout=1.8VDC
Vout=3.3VDC
Vout=3.6VDC
Vout=1.8VDC, use E-cap 330µF
Vout=3.3VDC and 3.6VDC
Vout=1.8VDC, use E-cap 330µF
Vout=3.3VDC and 3.6VDC
Min.
0.65VDC
Typ.
1.2VDC
1.5VDC
1.5VDC
0.4VDC
100µA
160µA
180µA
4ms
2ms
3.5ms
800µs
1200kHz
Max.
1.3VDC
3.15VDC
3.3VDC
150%, 10s
Start-up time
Rise time
Internal Operating Frequency
Notes:
Note4: For more information, please refer to “Overload Capability Graph” on page I-2
continued on next page
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REV.: 5/2018
www.recom-power.com/eval-ref-boards
I-1
R-78S
DC/DC Converter
Specifications
(measured @ Ta= 25°C,1.5Vin, full load and after warm-up unless otherwise stated)
Parameter
Minimum Load
Vout= 1.8VDC
Dropout Voltage
Output Ripple and Noise
ON/OFF CTRL
Input Current of CTRL pin
Standby Current
Vout= 3.3VDC
Vout= 3.6VDC
20MHz BW, 10%-100% load
DC-DC ON
DC-DC OFF
Series
Condition
Min.
Typ.
0%
500mV
150mV
300mV
100mVp-p
Open or 0.7V
≤
V
CTRL
<Vin
Short to GND or V
CTRL
<0.1V
5µA
7µA
Max.
Efficiency vs. Load
100
80
R-78S1.8-0.1
100
80
R-78S3.3-0.1
Efficiency [%]
Efficiency [%]
60
40
20
0
60
40
20
0
1.2Vin
1.5Vin
2.4Vin
3.0Vin
0
20
40
60
80
90
100
1.3Vin
0
20
40
60
100
Output Current [%]
100
80
60
40
20
0
1.5Vin
2.0Vin
2.5Vin
3.0Vin
3.3Vin
0
20
40
60
80
100
Output Current [%]
R-78S3.6-0.1
Overload Capability
Peak Current
Continuous Current
150
Output Current [%]
Efficiency [%]
100
90
0
20
30
120
130
Output Current [%]
Time [s]
Line Derating
100
Continuous Current
150
Peak Current
Maximum Output Current [%]
Maximum Output Current [%]
80
60
40
20
0
0.65
1.8Vout
3.3Vout
3.6Vout
1.2 1.45
1.3
1.8
2.4
3.0 3.3
3.15
140
130
120
110
100
0.65
3.3Vout
3.6Vout
1.2 1.45
1.3
1.8
1.85 2.1
2.4
3.0 3.3
3.15
Input Voltage [V]
Input Voltage [V]
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REV.: 5/2018
I-2
R-78S
DC/DC Converter
Specifications
(measured @ Ta= 25°C,1.5Vin, full load and after warm-up unless otherwise stated)
REGULATIONS
Parameter
Output Accuracy
Line Regulation
Load Regulation
low line to high line, full load
10% to 100% load
Series
Condition
Value
±3.0% typ.
±0.3% typ.
±1.0% typ.
PROTECTIONS
Parameter
Short Circuit Protection (SCP)
Over Temperature Protection (OTP)
internal IC
Condition
below 100mW
≥
150°C
≤
130°C
Value
continuous, auto recovery
shutdown
restart after cooling down
ENVIRONMENTAL
Parameter
Operating Temperature Range
Maximum Case Temperature
Temperature Coefficient
Operating Altitude
Operating Humidity
Pollution Degree
MTBF
Vibration
according to MIL-HDBK-217F, G.B.
+25°C
+90°C
non-condensing
Condition
with derating (see graph)
Value
-40°C to +100°C
+105°C
0.015%/°C
5000m
5% to 95% RH
PD2
89365 x 10
3
hours
6963 x 10
3
hours
10-55Hz, 2G, 30min along X, Y and Z axis
Derating Graph
(@ Chamber and natural convection 0.1m/s)
100
Output Current [%]
80
70
60
50
40
20
0
-40
-20
0
20
40
60
80
100
120
Vin≥1.0V, R78S1.8-0.1
Vin≥1.8V, R78S3.3-0.1
Vin≥2.0V, R78S3.6-0.1
Vin<1.0V, R78S1.8-0.1
Vin<1.8V, R78S3.3-0.1
Vin<2.0V, R78S3.6-0.1
90
Ambient Temperature [°C]
SAFETY AND CERTIFICATIONS
Certificate Type (Safety)
Audio/video, information and communication technology equipment
Safety requirements (CB Scheme)
EAC
RoHs2+
continued on next page
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REV.: 5/2018
I-3
Report / File Number
WD-SE-R-170351-00
RU-AT.49.09571
Standard
IEC62368-1, 2nd Edition, 2014
EN62368-1, 2014
TP TC 004/2011
RoHS 2011/65/EU + AM2015/863
R-78S
DC/DC Converter
Specifications
(measured @ Ta= 25°C,1.5Vin, full load and after warm-up unless otherwise stated)
EMC Compliance
Electromagnetic compatibility of multimedia equipment -
Emission requirements
Information Technology Equipment - Immunity Characteristics - Limits
and Methods of Measurement
ESD Electrostatic Discharge Immunity Test
Radiated, Radio-Frequency, Electromagnetic Field Immunity Test
Fast Transient and Burst Immunity
Surge Immunity
Immunity to Conducted Disturbances, Induced by Radio-Frequency Fields
Power Magnetic Field Immunity
Air ±8kV and Contact ±4kV
3V/m
±0.5kV
±0.5kV
3V r.m.s.
50Hz, 1A/m
Series
Condition
without external components
with external components
Standard / Criterion
EN55032:2010, Class A
EN55032:2010, Class B
EN55024, 2010
IEC61000-4-2:2008, Criteria A
IEC61000-4-3:2006, Criteria A
IEC61000-4-4:2012, Criteria A
IEC61000-4-5:2005, Criteria A
IEC61000-4-6:2013, Criteria A
IEC61000-4-8:2009, Criteria A
EMC Filtering Suggestions according to EN55022 Class B
L1
+Vin
C1
R-78S
+Vout
C1
2.2µF 16V MLCC
L1
1µH Choke
GND
GND
DIMENSION AND PHYSICAL CHARACTERISTICS
Parameter
Material
Package Dimension (LxWxH)
Package Weight
Type
case
potting
PCB
Value
non-conductive black plastic, (UL94 V-0)
epoxy, (UL94 V-0)
FR4, (UL94 V-0)
11.6 x 8.5 x 10.4mm
2g typ.
Dimension Drawing (mm)
embossed logo
11.6
8.5
10.4
Marking
0.70
+0.10/-0.05
2.00
0.25
±0.05
Pin Connections
Pin #
Function
1
+Vin
2
GND
3
+Vout
4
CTRL
Tolerance: xx.x= ±0.5mm
xx.xx= ±0.25mm
0.51
7.62
2.00
4.10
Recommended Footprint Details
2.54
1 2 3 4
Bottom View
2.54
1 2 3 4
Top View
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REV.: 5/2018
I-4
R-78S
DC/DC Converter
Specifications
(measured @ Ta= 25°C,1.5Vin, full load and after warm-up unless otherwise stated)
INSTALLATION AND APPLICATION
Standard Application Circuits
Vin
Series
R-78S3.3-0.1
GND
+Vin
0V
Vin
R-78S
GND
Vout
CTRL
+Vout
0V
Max. Capacitive
Load ±470µF
Vout
CTRL
N.C.
R-78S
GND
Single
Cell
Battery
N.C.
3.3V
Application
Vin
C1
Power-Save Application
Vcc
Vout
CTRL
N.C.
C2
-Vout
R-78S3.3-0.1
GND
CTRL
Vcc
R1
WAKE
SLEEP
3.3V
µP
WLAN
2.9V
System
Active
Power
(600µW)
Sleep Mode
(20µW)
Active
(600µW)
watchdog
wake-up
1.5V
5µA
C
R2
Energy Harverster (non-interruptable)
Vin
R-78S3.6-0.1
GND
Vout
3.3V
Solar
or
TEG
-
+
+
-
ICL 7673
Autoswitch
Rechargeable
3.3V Cell
Air Quality Data Logger
R-78S1.8-0.1
1.5V +
-
V
DD
1.8V - 3.3V
Microcontroller +
NVRAM
UART
SPI
V
DDIO
V
DD
Gas (VOC, CO)
Humidity
Temperature
Barometric
Pressure
1.8V - 3.3V
Air Quality
Sensor
BME680
Environmental
Sensor
Air quality sensor and microcontroller operate at 1.8V
(50% power consumption compared to 3.3V). When
external USB is plugged in, supply voltage is switched
to 3.3V for fast data download.
3.3V
GND
USB
USB
PACKAGING INFORMATION
Parameter
Packaging Dimension (LxWxH)
Packaging Quantity
Storage Temperature Range
Storage Humidity
non-condensing
Type
tube
Value
520.0 x 11.2 x 18.2mm
42pcs
-55°C to +125°C
5% to 95% RH
The product information and specifications may be subject to changes even without prior written notice.The product has been designed for various applications; its suitability lies in the responsibility of each customer. The
products are not authorized for use in safety-critical applications without RECOM’s explicit written consent. A safety-critical application is an application where a failure may reasonably be expected to endanger or cause
loss of life, inflict bodily harm or damage property. The applicant shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized
use of RECOM products in such safety-critical applications.
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