M62256FP Datasheet, PDF (1/9 Pages) Mitsubishi Electric Semiconductor – Single chip battery charger control IC

Mitsubishi Integrated Circuit <Digital/Analog Interface>
M62256FP
Single chip battery charger control IC
Outline
M62256FP is a semiconductor integrated circuit designed to control
the battery charger. This IC controls not only all the time sequence
needed for battery charging,but also gives full support for detection
of battery temperature,protection over current and voltage,and safety
timer,etc. It is also a simple matter to charge Ni-Cd,Ni-MH batteries
by adding a small peripheral components to this IC.
This IC has a feedback controlling of the charge current and the output
voltage.
Features
• Designed for low voltage(3V)operation.
• Built-in CR oscillator is used for internal logic.
• Built-in initialization timer and safety timer enable -∆V error
detection and over-charging.
• Built-in D/A converter and shift-resister circuits to maintain the
peak voltage of battery.
• Built-in Main output SW and discharge drive circuits.
• Built-in LED drive circuits for displaying the status of the power
supply and charging/discharging.
Pin Configuration(Top view)
C1 1
E1 2
C2 3
E2 4
C3 5
E3 6
Rc 7
Cc 8
Dchg IN 9
Dchg OUT 10
Chg SW 11
GND2 12
Batt SW 13
Dchg SW 14
Adpt SW 15
Test1 16
Test2 17
N.C 18
36 Vref1
35 _ISET2
34 _ISET1
33 OCSET
32 PCS OUT
31 PCS IN
30 CP1
29 _IDET
28 Vcc
27 GND1
26 _CP2
25 _VDET
24 P.C
23 Batt _T
22 Vref2
21 Batt _-
20 Batt +
19 N.C
• Built-in System Reset circuit for detecting the power supply
voltage.
36P2R
• Built-in temperature detection circuit for the Ni-MH battery
• Built-in voltage and current control circuit which enables
feedback to the primary side of the SMPS.
Uses
• Built-in protective functions including detection of over-voltage
in charge mode and over-current in adapter mode, and others.
General electronic battery charger for VCR and
camera in one unit, handheld telephones, etc.
Block diagram
Vcc
Vref2 Vref1 Iset2 Iset1 ^{C1 C2 C3 E1E2 E3 Chg SW Dchg OUT Dchg IN I} DET
28
22 36
35
34
13 524 6
11
10
9
29
P.C 24
V_{DET 25}
CP2 26
Stabl'd
Pwr. Sup.
System
Reset ckt.
to internal
circuit
to internal
circuit
Detect un-
plugged PS cord
Voltage
control
OP Amp.
+
– Voltage
set-up ckt.
LED driver
Output SW Discharge
driver
driver
Discharge
current control
Control logic
14 Dchg SW
13 Batt SW
15 Adpt SW
CP1 30
PSC IN 31
PSC OUT 32
+
–
Current
set-up ckt.
Current
control
OP Amp.
Safety
timer
Oscillator
Clock
gen. ckt.
Test ckt.
Over-current
det. ckt.
-∆V error det.
prev. logic
Battery temp
det. ckt.
Batt. voltage
det. ckt.
-∆V det.
logic
23 Batt T
20 Batt +
21 Batt –
12
GND2
(A.GND)
78
Rc Cc
16 17
33
27
Test1 Test2 OCSET GND
(P.GND)