RICOH R5434D Series Li-ion Li-polymer Battery Cells Second Protection IC Manual User Guide
Summary
Essential secondary protection IC designed for multi-cell (2–5 cell) Li-ion and Li-polymer batteries. This component monitors voltage levels to provide crucial over-charge detection, automatically cutting off charging currents to ensure battery safety. The accompanying manual guides designers by detailing technical specifications, adjustable thresholds, block diagrams, and applications suitable for power tools, notebook PCs, and general consumer electronics using battery packs.
Page 1 Text Content
R5434D Series
Li-ion/ Li-polymer2/3/4/5 Cell Batteries Second Protection IC
R5434D Series are high voltage second protection ICs for 2-5cells rechargeable Li-ion/Li-polymer batteries. Each of these ICs is composed of voltage detectors, reference units, a delay circuit, an oscillator, a counter and logic circuits. When each cell is detected over-charge, COUT outputs "H" and Fuse is cut down by turning off external Nch MOS FET. Charging is stopped. Output condition is CMOS. The package is SON-8.
FEATURES • Supply Voltage (VDD)································ -0.3V to 30V / VC2-0.3V ∼ VC2+6.5V (Absolute maximum Rating) • Operating Input Voltage Range (VDD) ······ 4.0V to 25.0V • Supply Current (IDD) ································· Typ.3.0μs • Over-charge Detector Threshold Range 3.6V to4.6V • Over-charge Voltage Accuracy ················ ±25m V • Over-charge Delay time··························· 1.5s • Package···················································· SON-8
BLOCK DIAGRAMS
VD1-1
VC2 Regulator
VD1-2
Regulator
Logic Logic
Circuit CTLC
Circuit
VC3 Oscillator DS
VD1-3 Circuit
Counter
Regulator
VD1-4
VD1-5
SELECTION GUIDE Halogen Free Package Quantity per Reel Part No. SON-8 3,000 pcs R5434Dxxx.$.∗ -TR-FE
.xxx : Serial Number for the R5434D Series designing input a threshold for over-charge. .∗ : Designation of protection type.
(.A.) Auto release after Over-charge.
PACKAGE
SON-8
Bottom View Top View
VC4 VC3
∗ ∗ VC2
VDD CTLC COUT VSS
APPLICATIONS • Li-ion/Li polymer batteries second protector for over-charge. • Over-charge second protections for notebook PCs, power tools, and any gadgets using on board Li-ion/Li Polymer battery. No.EK-267-111024 Li-ion / Li-polymer Multi-Cell protect IC
Page Summary Contents For RICOH R5434D Series Li-ion Li-polymer Battery Cells Second Protection IC Manual User Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 2 |
| File Size | 142.23 KB |
| Published | May 31, 2026 |
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Frequently Asked Questions
What kind of batteries does the R5434D series protect?
It is designed for 2-5 cell rechargeable Li-ion or Li-polymer batteries.
How does the IC detect and stop over-charging?
The COUT output goes high ('H') when a cell is detected over-charged, turning off an external Nch MOS FET to stop charging.
What is the acceptable Operating Input Voltage Range (VDD)?
The required operating input voltage range (VDD) is 4.0V to 25.0V.
In what package and connection format is this IC supplied?
It uses a SON-8 package, and its output condition status is CMOS.