www.recom-power.com

REV.: 0/2017

P-1

R-REF02-78S

Reference Design

Features

Reference

Design

• 3.3V from a single AA battery (boost converter)

• Efficiency 93%, >80% at 10% load

• Input voltage range down to 0.65V

• 0.100“ (2.54mm) pin output

• 3.5mm mounting holes

Description

The R-REF02-78S generates 3.3V from a single AA battery and can directly be used in any

application. The reference design contains a AA battery holder and an R-78S3.3-0.1 boost converter.

Two jumper headers J1 and J2 ensure connectivity to the output voltage and the CTRL pin of the

R-78S converter. The jumper header pins are standard 0.100” (2.54mm) pitch for which there are

several mating connectors available. Two 3.5mm mounting holes are provided to allow snap-in

or screw mounting. An enable pin puts the R-78S into sleep-mode where it draws only 7uA

from the battery.

BASIC CHARACTERISTICS

Parameter

Condition

Min.

Typ.

Max.

Under Voltage Lockout

DC-DC OFF

0.4VDC

peak duty cycle 10%

150%, 10s

Quiescent Current

160µA

Start-up Time

2ms

Rise Time

800µs

Internal Operating Frequency

1200kHz

Minimum Load

0%

Dropout Voltage

150mV

Output Ripple and Noise

100mVp-p

ON/OFF CTRL

DC-DC ON

DC-DC OFF

Open or 0.7V

≤ V

Short to GND or V

Input Current of CTRL Pin

5µA

Standby Current

7µA

Selection Guide

Part

Input

Output

Output

Max. Capacitive

Number

Voltage

Current

@ min Vin

@ typ. Vin

[VDC]

[VDC]

[mA]

[%]

[%]

[µF]

R-78S3.3-0.1

0.65-3.15

3.3

100

92

93

470

Notes:

Note1: Efficiency is tested at full load. Typ. Vin = 1.5V

Note2: Max. capacitive load is tested at nominal input and full resistive load

Note3: For more information, please refer to “Overload Capability Graph” on page P-2

Caution:

ESD sensitive. Always follow ESD preventative procedures when

handling the product!