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M62253BGP

Charge Control IC for Li-Ion Batteries

Renesas Electronics 

M62253BGP

How to Set Quick Charge Current and Charge Completion Detection Current

(1) How to set quick charge current (Iqchg)

Quick charge current (Iqchg) depends upon RSENSE.

Set the value of RSENSE by putting Iqchg required into the formula below.

RSENSE [Ω] = charge current setting voltage 2 / Iqchg [mA] =256 mA / Iqchg [mA]

, where pre-charge current is given by:

Pre-charge current = charge current setting voltage 1 / RSENSE = 26 mV / RSENSE

(2) How to set charge completion detection current (Icomp)

Charge completion detection current (Icomp) depends upon RSENSE and ADJ terminal voltage (Vadj).

Set ADJ terminal voltage by putting charge completion detection current required and RSENSE given by (1) into

the formula below.

Vadj [V] = 5 × RSENSE [Ω] × lcomp [A]

, where the constant 5 is internally fixed.

Note: Refer to the chart below for setting RSENSE and ADJ terminal voltage.

(Chart below shows the relationship between ADJ terminal voltage (Vadj) and charge completion detection

current (Icomp).)

ADJ Term. Volt. Setting

Quick charge

256 mA

450 mA

512 mA

Rsense

1Ω

0.56 Ω

0.50 Ω

Charge comp. current lcomp

26 mA 100 mA 130 mA 100 mA 130 mA

ADJ term. voltage Vadj = 5 × Rs × lcomp 125 mV 280 mV 364 mV 250 mV 325 mV

Note: Several 10 kΩ or around is recommended for the total resistor value R1 and R2 for ADJ.

700 mA

0.36 Ω

100 mA 130 mA

180 mV 234 mV

How lcomp Relates itself to Vadj

1000

750

500

Rsense = 1 Ω (quick charge current = 256 mA)

Rsense = 0.50 Ω (quick charge current = 512 mA)

Rsense = 0.36 Ω (quick charge current = 700 mA)

250

0

0

50 100 150 200 250 300

Icomp (mA)

Note: Set charge current setting voltage 2 to be

greater than charge current setting voltage 1.

REJ03F0243-0200 Rev.2.00 Sep 14, 2007

Page 11 of 12

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