RICOH R5461K Series Data Sheet User Manual

R5461K Series

Li-ion/polymer 2Cell protector IC with alarm function

The R5461K Series are high voltage CMOS-based protection ICs for over-charge/discharge of rechargeable two-cell Li-ion/Lithium polymer, further include an alarm function and a short protection for preventing large external short circuit current and the protection circuits against the excess discharge-current and excess charge current. Each of these ICs is composed of detectors, a temperature detector, reference units, a delay circuit, a short circuit protector, an oscillator, a counter, and logic circuits. The signal is outputted before detecting over-charge due to having an alarm function. They are settable for normal, high and low temperature. So they can make it safer to charge a battery. The Over-charge detector threshold and the alarm detector threshold are high accuracy such as +10m V/−15m V. DFN(PLP)2527-10 package is available.

FEATURES • Supply Voltage (VDD) ······································· 12V (Absolute Maximum Rating) • Over-discharge Detector Threshold Range ········· 2.0 to 3.0V (0.1V Steps) • Charger Negative Input Voltage (V-) ··············· −30V (Absolute Maximum Rating) (VDET2) Voltage Accuracy ························ ±2.5% • Operating Input Voltage Range (VDD) ············· 1.5V to 10.0V Output Delay Time (t VDET2) ········· Typ. 128ms • Supply Current (IDD)········································· Typ. 4.0μA (G version) • Excess Detector Threshold Range ········· 0.05V to 0.24V (0.005V steps)

Typ. 5.0μA (C version) discharge-current Voltage Accuracy ························ ±15m V

• Standby Current (Is)········································· Max. 0.1μA (VDET3) Output Delay Time (t VDET3) ········· Typ. 12ms • Over-charge Detector Threshold Range····· 3.6V to 4.35V (0.005V Steps) • Excess Detector Threshold ····················· −0.10V to −0.22V

(VDET1) Voltage Accuracy···················· +10m V/−15m V (0°C∼50°C) charge-current Voltage Accuracy ························ ±30m V

Output Delay Time (t VDET1)····· Typ. 1.0s (VDET4) Output Delay Time (t VDET4) ········· 8ms

• Alarm function Detector Threshold Range 3.2V to 4.5V (0°C∼45°C) • Short Protection Detector Threshold (Vshort) ········· Typ. 1.0V

3.1V to 4.4V (45°C∼60°C) Output Delay Time (tshort) ··········· Typ. 300μs Voltage Accuracy···················· +10m V/−15m V • 0V-battery charge ···················································· Selectable

Output Delay Time ················· 6ms • Packages ································································· DFN(PLP)2527-10

BLOCK DIAGRAMS R5461K2xx AC R5461K2xx AG

VDD VDD

DC Circuit DC Circuit

VD1U Oscillator Counter VD1U Oscillator Counter

TIN TIN

Logic Level Logic Level Circuit Shift Circuit Shift

VALMU VALMU

Short

TSWH Short TSWH Delay Detector

VD2U Delay Detector VD2U

VC VD1L VC VD1L

Logic Logic VD4 Circuit VD4 Circuit

Logic Logic Circuit Circuit

VALML VALML

EN EN

VD2L VD3 VD2L VD3

RIN RIN

VSS DOUT COUT V- VSS DOUT COUT V-

SELECTION GUIDE Halogen Free Package Quantity per Reel Part No.

DFN(PLP)2527-10 5,000 pcs R5461K2.xx.$.∗ -TR

.xx : Serial Number for the R5461K Series designing .∗ : Designation of release after detecting, 0V-charge, Alarm function.

input thresholds for over-charge, over-discharge, (.C.) They are released in Auto Release after Over-charge and Latch function after Over-discharge. excess discharge-current and excess 0V-charge is unavailable. charge-current detectors.

There are two types alarm functions such as normal temperature and high temperature.

Designation of Output delay option of

The output of signal turns to high impedance from "H" after detecting over-charge.

over-charge, alarm function, over-discharge,

(.G) They are released in Auto Release after Over-charge and Latch function after Over-discharge.

excess charge-current, alarm function, and

0V-charge is available.

excess discharge-current.

There are two types alarm functions such as normal temperature and high temperature.

(.A.) t VDET1=1s, t VALM=6ms, t VDET2=128ms,

The output of signal turns to high impedance (Normal temperature) or middle level (High temperature) from "H"

t VDET3=12ms, t VDET4=8ms

after detecting over-charge.

PACKAGE

DFN(PLP)2527-10

Bottom View Top View

VDD 6 COUT

VSS 7 V- RIN 8 NC TIN 9 AOUT 1 5 2 3 4 5 14 VC 10 DOUT

∗) The tab is substrate level (VDD)

APPLICATIONS • Li-ion/Li polymer protector of over-charge, over-discharge, excess discharge-current, excess charge-current for battery pack • High precision protectors for DSLR, portable DVD player and any other gadgets using on board Li-ion/Li polymer battery

Li-ion/polymer 2Cell protector