Skip to main content Skip to first level navigation

RICOH imagine. change.

RICOH ELECTRONIC DEVICES CO., LTD.

Skip to main content First level navigation Menu
Main content

R5438 Series
1-Cell to 3-Cell Li-ion Battery Second Protection IC

Product Specifications

The R5438 is an overcharge protection IC for 1 to 3 serial cells Li-ion / Li-polymer rechargeable battery. This device provides the high-accuracy voltage detection function and the shutdown function can reduce the supply current to the minimum when all cell’s voltage becomes less than the shutdown detection voltage.

FEATURES

Operating Input Voltage Range 1.5 V to 20 V or VC1 +5 V (Absolute Maximum Rating 26 V)
Supply Current Typ. 0.85 µA
Overcharge (VDET1) Detector Threshold Range 4.1 V to 4.6 V (0.005 V Steps)
Detector Threshold Accuracy ±0.02 V
Detection Delay Time 2 s, 4 s, 6 s with Delay Time Shortening Function*1
Release Voltage VDET1 to VDET1−0.5 V (0.05 V Steps)
Release Voltage Condition Voltage Release Type
Shutdown Detector Threshold 3.5 V ±0.3 V
Shutdown Current Max. 0.1 µA
Functions 1 to 3 Cells Selectable Battery Protection
Package DFN 1814-6

*1: The delay time can be reduced down to approx. 1/90 by applying a 4 V ± 0.2 V to the VDD ‒ VC1 pins.

APPLICATION INFORMATION

Normal Mode (CMOS Output, Active-high)

Note 1: As for the order of cell's connection, connect a positive terminal of CELL1 as the end terminal.
Note 2: In Delay Shortening (DS) mode, applying a voltage of 4V between VDD and VC1 is required.
RVDD: 100 Ω, R1 to R3: 1000 Ω, CVDD,C1 to C3: 0.1 µF

PIN DESCRIPTION

DFN1814-6

DFN1814-61.4 mm × 1.8 mm
1 COUT
2 VDD
3 VC1
4 VC2
5 VC3
6 VSS

R5438 Series for Consumer

APPLICATIONS

  • Li-Ion or Li-Polymer Battery Protection

PRODUCT LONGEVITY PROGRAM

R5438 operate PRODUCT LONGEVITY PROGRAM (ten-year supply is maintained as of January, 2016).
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The overcharge and the delay time are user-selectable options.

Product Name   Package Quantity per Reel
R5438Lxxx$A-TR ConsumterPLP DFN1814-6 5,000
  • xxx … Specify the combination of the overcharge detector threshold (VDET1n) and the overcharge release voltage (VREL1n).
    VDET1n*1: 4.1 V to 4.6 V in 5 mV step
    VREL1n*1: VDET1n – 0 V to VDET1n – 0.5 V in 50 mV step
  • $ … Specify the combination of the overcharge detection delay time (tVDET1) and the overcharge release delay time (tVREL1).
Code tVDET1 (s) tVREL1 (ms)
A 2 16
B 4 16
C 6 16

*1: VDET1n, VREL1n : n =1, 2, 3

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
DFN1814-6 R5438L

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.

Inquiry about products

Technical Support

Inquiries (SSL Form)

Inquiry about business

Purchase, Request for Samples and Documents

Distributors

Sample Online

Online Distributors