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Mitsubishi Integrated Circuit
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.
Pin Configuration(Top view)
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 Vref1
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. * Built-in System Reset circuit for detecting the power supply voltage. * 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. * Built-in protective functions including detection of over-voltage in charge mode and over-current in adapter mode, and others.
C1 E1 C2 E2 C3 E3 Rc Cc Dchg IN Dchg OUT Chg SW GND2 Batt SW Dchg SW Adpt SW Test1 Test2 N.C
OCSET PCS OUT PCS IN CP1
I SET2 ISET1
36P2R
M62256FP
IDET
Vcc GND1 CP2
VDET
P.C Batt T Vref2 Batt Batt + N.C
Uses
General electronic battery charger for VCR and camera in one unit, handheld telephones, etc.
Block diagram
Vcc
28
Vref2 Vref1 Iset2
22 36 35
Iset1
34
C1 C2 C3 E1E2 E3 Chg SW
1 3 5 2 4 6 11
Dchg OUT
10
Dchg IN I DET
9 29
Stabl'd Pwr. Sup. System to internal Reset ckt. circuit to internal circuit
LED driver
Output SW driver
Discharge driver
Discharge current control
P.C VDET CP2
24 25 26
Detect unplugged PS cord
14 Voltage control OP Amp.
Dchg SW Batt SW Adpt SW
Control logic
13
+ -
Voltage set-up ckt.
15
+ -
CP1 PSC IN PSC OUT
30 31 32
Current set-up ckt. Current control OP Amp. Safety timer
Over-current det. ckt.
Battery temp det. ckt. Batt. voltage det. ckt.
23 20 21
Batt T Batt + Batt -
-V error det. prev. logic Oscillator Clock gen. ckt.
Test ckt.
-V det. logic
12
7
8
16
17
33
27
GND2 (A.GND)
Rc
Cc
Test1 Test2 OCSET
GND (P.GND)
Mitsubishi Integrated Circuit
M62256FP
Single chip battery charger control IC
Functions of Terminal Explained
Terminal No. Symbols
Functions
These terminals are used to set the LED drive currents.
1, 3, 5 2, 4, 6 7, 8 9 10 11 27, 12 13 14 15 16 , 17 20 21 23 22 24 25 26, 30 29 31 32 33 34, 35 36
C1,C2,C3 LED drive terminals (Open collector outputs) E1,E2,E3 Rc, Cc Dchg IN
These terminals are used to set the oscillating frequency of the internal clocks. This is an input terminal used to detect the current which is used for the discharge current feedback.
Dchg OUT This is the drive terminal for the transistor mounted externally for discharge purposes. Chg SW GND1, 2 Batt SW This is the SW drive terminal used for charging battery. These are grounding terminals. (GND1 is for logic and GND2 is for analog.) This is used to detect mounting of battery.(It is pulled up internally)
Dchg SW This is used to detect the discharge SW.(It is pulled up internally) Adpt SW This is used to detect adapter SW.(It is pulled up internally) Test1, 2 Batt + Batt - Batt T Vref2 P.C V DET These are Test Mode set-up terminal.(It is pulled up internally) This terminal is connected to the + terminal of the battery. This terminal is connected to the - terminal of the battery. This terminal is connected to the temperature detecting terminal of the battery. This is the voltage reference terminal for temperature detection. This terminal is connected to the photo-coupler used for feedback. This terminal is used to monitor the output voltage.
This terminal is used to make connection with capacitor(s) and resistor(s) CP1, CP2 which are used for phase compensation. I DET PCS IN This terminal is used to detect the charging current or output current. This is an input terminal used for photo-coupler short.
PCS OUT This terminal goes "H" when over-current is detected. OC SET This terminal is used to set the over-current detection value when the adapter mode is used. Iset1, 2 Vref1 These are used to set the charging current.(Iset1 is for quick charge and Iset2 is for the trickle charge.) This terminal is sets the standard voltage for over-current set-up value and the charge current set-up.
Mitsubishi Integrated Circuit
M62256FP
Single chip battery charger control IC
Absolute Maximum Ratings (Ta=25C unless specified otherwise)
Items
Power supply voltage Chgon terminal drive current Dchgout terminal drive current LED drive current P.C drive current Vref1 output current Vref2 output current Power dissipation Thermal derating ratio Operating temperature Storage temperature
Symbols
Vcc IChgon IDchg I C1~C3 IP.C Iref1 Iref2 Pd K Topr Tstg
Condition
Ratings
16 50 -5 20 5 -1 -1 650
Unit
V mA mA mA mA mA mA mW mW/C C C
Ta=25C Ta>25C
6.5 -20~+75 -40~+125
(Notes) Polarity of current: The direction of current flowing into the IC is considered positive(+). The direction of current flowing out of the IC is considered negative(-). The voltage impressed on the open collector output terminal should be the absolute maximum voltage of the power supply. The voltage difference between the negative terminal of the battery and the GND terminal should be 0V~0.6V.
Mitsubishi Integrated Circuit
M62256FP
Single chip battery charger control IC
Electrical Characteristics (Vcc=7V, Ta=25C unless specified otherwise)
All device Items
Power supply voltage Circuit current Power supply detecting voltage
Symbols
Vcc Icc VTHVcc
Conditions
Vcc=7V when quick charge
Standard
Min 3.0 18.0 2.66 Typ 27.0 2.80 Max 15.0 40.0 2.94
Unit
V mA V
Reference Items
Vref1 output voltage Vref2 output voltage
Symbols
Vref1 Vref2
Standard Conditions
Iref1=150uA Iref2=350uA Min 1.18 1.70 Typ 1.25 1.80
Max Unit 1.32 V V 1.90
Items
OCSET terminal flow out current ISET1 terminal flow out current 1 ISET1 terminal flow out current 2 ISET2 terminal flow out current 1 ISET2 terminal flow out current 2
Symbols
IOCSET ISET1-1 ISET1-2 ISET2-1 ISET2-2
Conditions
OCSET=220mV Excluding charging time When charging Excluding trickle charging time When trickle charging
Standard
Min -1 30 -1 30 -1 Typ 50 50
Max Unit uA 85 uA uA uA 85 uA
Driver Items
Chgon terminal output L voltage Dchgout terminal H voltage LED output L voltage DchgIN terminal detecting voltage
Symbols
VsatChg VOH Dchg Vsat LED VDchgIN
Conditions
I Chgon =50mA I Dchgout =5mA,Vcc=7V I LED =5mA
Standard
Min
- - -
0.5
Typ 0.3 5.2 0.3 0.8
Max Unit 0.6 V 6.0 V V 0.6 V 1.2
Control Section Items
Range of input voltage Input bias current P.C output L voltage PCS OUT terminal flow out current PCS IN terminal threshold voltage
Symbols
V IN I Bias V PCL I PCSOUT VTHPCSIN
Conditions
Standard
Min 0 -1 Typ Max Vcc 0.5 -5 1.2
Unit
V uA V uA V
IPC =2mA When over-current is detected
-
-18 0.5
0.2 -10 0.8
Each SW Detection Terminal Items
Batt SW terminal flow out current Batt SW terminal threshold voltage Dchg SW terminal flow out current Dchg SW terminal threshold voltage Adpt SW terminal flow out current Adpt SW terminal threshold voltage
Symbols
I BattSW VTHBatt I DchgSW VTHDchg I AdptSW VTHAdpt
Conditions
Vcc=7V, V BattSW =0V Vcc=7V Vcc=7V, V DchgSW =0V Vcc=7V Vcc=7V, V AdptSW =0V Vcc=7V
Standard
Min -240 3.0 -240 3.0 -240 3.0 Typ -140 5.6 -140 5.6 -140 5.6
Max Unit uA -80 6.0 V uA -80 V 6.0 uA -80 V 6.0
Mitsubishi Integrated Circuit
M62256FP
Single chip battery charger control IC
Internal Voltage Set-up Items
Set-up output voltage at Adpt mode Set-up output voltage at charge mode
Symbols
VAdpt VCHG V DOWN
Conditions
Standard
Min 820 1.19 478 123 11.4 208 9.0 0.6 60 4.7 0.92 1.06 0.81 Typ 864 1.26 504 130 12.0 220 9.5 1.0 100 5.0 0.97 1.12 0.86 Max 910 1.33
Unit
mV V
Set-up output voltage when over-current is detected ISET1 set-up voltage ISET2 set-up voltage OCSET set-up voltage Over-voltage set-up voltage -V detection voltage1 -V detection voltage2 Voltage at the end of discharge
Temperature detection set-up voltage1 Temperature detection set-up voltage2 Over-heating detection set-up voltage
530 mV 137 12.6 232 10 1.4 140 5.3 1.02 1.18 0.91 mV mV mV V V mV V V V V
V ISET1 When quick charging V ISET2 When trickle charging VOCSET When adapter mode VOVP V -V-1 within Initialization timer after initialization timer has passed V -V-2 VCHGON VTTH1 Temperature at the start of charging Temperature at the start of recharging V TTH2 Charge stop temperature VO/H
Min Typ Max Oscillation frequency fosc 9.22 10.24 11.26 KHz Rc=30KE , Cc=2200pF Initialization timer1 Tm1 Battery voltage<5V 18.0 20.0 22.0 min 5VBattery voltage<6.5V 4.5 5.0 5.5 min Initialization timer2 Tm2 Initialization timer3 Battery voltage6.5V Tm3 2.7 3.0 3.3 min Undetected time for -EV TNDET 2.7 3.0 3.3 min hr Safety timer1 Tms1 when quick charging 2.7 3.0 3.3 Safety timer2 Tms2 when trickle charging 21.6 24 26.4 hr Over-current detection time TOC 9.0 10.0 11.0 sec Note: The time given to each timer is when the oscillation frequency of 10.24KHz is used.
Items
Symbols
Conditions
Standard
Unit
Recommended Operating Range
Power supply voltage (Vcc) ........................ 3~15V Charge current (See Note1) Preliminary charge ........................... 50~200mA Quick charge ................................. 0.8~2A Trickle charge ................................. 80~200mA Discharge current (See Note1) ..................... 300~500mA LED drive current (See Note2) ..................... 115mA Note1. The charging current must be set according to the battery specifications. The currents used for quick charge and trickle charge are detemined by the voltage of the terminals Iset1 and Iset2 and current sense resistor R4 (Application in page 9). Note2. The LED drive current is calculated by the following equation.
200mV I LED ** = (A) RL
Mitsubishi Integrated Circuit
M62256FP
Single chip battery charger control IC
FUNCTION DESCRIPTION
1. Charging Operation (1) Detection of Battery
When the Batt SW terminal shows "L", it indicates that the battery is installed
(2) Conditions for Quick Charge
As soon as the battery is installed, its voltage and temperature are detected. If the battey voltage is below 5V, the preliminary charging mode starts. When the battery voltage exceeds 5V, the quick charge commences. On the other hand, if the battery voltage exceeds 5V, the following will take place. If the battery temperature is less than 55C, the quick charge will take place. If it is higher than 55C, the preliminary charge mode will continue until the temperture falls below 55C. The charge current used for the quick charge is set by Iset1.
(3) Initialization timer
The initialization timer is set according to Table1. The -V is not detected fot 3 minutes. Detection of -V within the initialization timer is set to 1V to prevent erroneous detection of -V during the initial charging.
Table1 Setting up the initialization timer The initial battery voltage
Less than 5V More than 5V but less than 6.5V 6.5V or more
Time of initializaton timer
20min. 5min. 3min.
(4) Charge control
When the initialization timer completes its function, detection of -V is set to 100mV and the peak voltage of the battery held inside is compared against the battery voltage detected. After -V is detected, the trickle charge starts at the current set by Iset2.
(5) Safety Timer
The Safety Timer controls the charging time. The quick charging time stops 3 hours and the trickle charging time ends after 24 hours.
(6) Protective functions
(a) Over-voltage detection ............ Charging stops when the battery voltage goes to 9.5V or higher. (b) Over-heat detection ............ Charging stops when the battery temperature becomes 63C or higher. When the temperature goes to 45C or lower, It recharges once. (c) Power supply voltage detection When the power supply voltage goes below 2.8V, the initial eset takes place. (d) Unplugged power supply cord ... When the unplugged power supply cord is detected, the output SW is turned off.
(7) Appliciable batteries
Ni-Cd battery, Ni-MH(nickel-metalhydrogen) battery (T/t, V taper can not be detected.)
Mitsubishi Integrated Circuit
M62256FP
Single chip battery charger control IC
2. Adapter Mode Operation (1) Adapter Mode
The adapter mode (Adapter standby mode) goes into effect when both the battery and the adapter are not connected. The fixed voltage mode (7.2V) is set.
(2) Detection of Adapter
Adpt SW is used for detection of Adapter. When this terminal goes "H", Adapter is judged to be present. If Adapter is connected during charging, charging is discontinued and the Adapter Mode goes into effect. (The Adapter Mode has priority.)
(3) Setting Up the Output Voltage
The output voltage at the time of the Adapter Mode is set the internally set 7.2V.
(4) Protection Function
The over-current protection function is the only one protective function active during the Adapter Mode. The current value is set by the voltage at the OCSET terminal. When the over-current is detected, the output is controlled as shown in the following flow chart, The RESET will take place when Adpt SW terminal goes "L".
Over-current detection
No 10 sec. has passed? Yes Output down (4.2V set)
No 10 sec. has passed? Yes PCS OUT terminal "H"
Mitsubishi Integrated Circuit
M62256FP
Single chip battery charger control IC
3. Discharge Operation (1) Discharge Control
The Dchg SW terminal is used for the forced discharge of the battery. Discharge starts when this terminal stays "L" 0.7seconds or more. The Dchg IN terminal and the Dchg OUT terminal are used to control discharge. These terminal contain the feedback function which enables constant current discharge.
(2) Detection of Adapter
When the voltage of the battery which has been discharging reaches 5V or less, the discharge Mode has canceled. ( Charging Mode takes over.)
(3) Forced Ending of Discharge
Once the discharge mode is in progress, it is possible to cancel the discharge mode by making the Dchg SW terminal to "L" once more. (Stays 0.7 seconds or more.)
(4) RESET Operation
The RESET circuit goes into operation when the power supply voltage goes 2.8V(typ) or lower. The internal logic circuit are all RESET to the initial states.
(5) Modes Setting
The Adapter Mode has the highest priority. Modes are switched in the following. (a) When the power is turned ON Power ON puts the Adapter Mode in Standby Batt IN causes the Charge Mode to take over. Adpt IN causes the Adapter Mode to take over.
(b) When the battery is connected ... * Quick charge .....................
Adpt IN causes the Adapter Mode to take over. Adpt IN causes the initial RESET to start and the Adapter Mode goes into operation. Adpt OUT starts the Charging Mode by way of the initial check. * Trickle charge ..................... Adpt IN sets the Charge OFF and the Adapter Mode takes over. The Charge OFF Mode continues after Adpter OUT. * Charge OFF ........................ Adpt IN causes temporary stop. Then, the Adapter Mode takes over. * Charge standby (Preliminary charge) ......... Continues after Adpt OUT
(c) When the battery is disconnected during the Adapter is in operation Adpt IN Batt OUT Adpt OUT Adapter Mode standby Adpt IN Batt OUT Batt IN Adpt OUT : It is assumed that a different battery connected and the Charge Mode starts by way of the initial check.
Application example M62256FP
R2 8.8K R3 1.2K
C1
L1
To Adapter
R1 0.1
Au
D1 R5 D2 Q1 D3 R6 Q2 30 CP1 Dchg OUT 10 Dchg IN 9 SW1 Dchg SW 14 R8 Batt + 20 R9 Batt Batt 21
T
+ C2 L2 P.C RP1 CP1 R4 RP2 CP2 0.1 0.1 26 CP2 I DET Chg SW 11 29 32 25 V DET P.C 24
28
31
PCS LED1 OUT 1 C1( Power Supply LED) LED2 3 C2( Charge LED) R7
Vcc
PCS IN
LED3
5 C3( Discharge LED)
RL1
1K 9K
+
2 E1
M62256FP
-
23 R10 3K T
To Batt
RL2
4 E2
RL3 Vref2 22
6 E3
SW2 Batt SW 13 Vref1 OCSET 36 R13 11.32K R15 120 R14 1.06K R11 20.6K R12 4.4K 33 34 35 ISET1 ISET2 Test1 16 N.C Adpt SW 15 Test2 GND1 GND2 17 N.C 27 12 SW3
Rc
Cc
7
Rc
8
Mitsubishi Integrated Circuit
Single chip battery charger control IC
M62256FP
30K Cc 2200P

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