M62256FP Single Chip Battery Charger Control IC REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Description 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 (3 V) 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. Applications General electronic battery charger for VCR and camera in one unit, mobile phone, etc. Block Diagram Vref2 Vref1 Iset2 Iset1 Vcc 28 36 22 35 34 Stabl'd Pwr. Sup. System to internal Reset ckt. circuit P.C 24 VDET 25 CP2 26 CP1 PCS IN PCS OUT 31 1 3 5 2 4 6 LED driver 11 10 Output SW driver Discharge driver Detect unplugged PS cord + − Voltage control OP-amp. 29 Discharge current control 14 Dchg SW 13 Batt SW 15 Adpt SW Battery temp det. ckt. 23 Batt T Batt. voltage det. ckt. 20 Batt + 21 Batt − Voltage set-up ckt. Current set-up ckt. Over-current det. ckt. Safety timer −∆V error det. prev. logic 32 Oscillator 12 9 Control logic Current control OP-amp. GND2 (A.GND) Dchg IN IDET to internal circuit + − 30 C1 C2 C3 E1 E2 E3 Chg SW Dchg OUT 7 8 Rc Cc REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 1 of 10 Clock gen. ckt. Test ckt. 16 17 −∆V det. logic 33 Test1 Test2 OCSET 27 GND1 (P.GND) M62256FP Pin Arrangement M62256FP 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 1 36 2 35 3 34 4 33 5 32 6 31 7 30 8 29 9 28 10 27 11 26 12 25 13 24 14 23 15 22 16 21 17 20 18 19 Vref1 ISET2 ISET1 OCSET PCS OUT PCS IN CP1 IDET Vcc GND1 CP2 VDET P.C Batt T Vref2 Batt − Batt + N.C (Top view) Outline: PRSP0036GA-A (36P2R-A) Pin Description Pin No. 1, 3, 5 2, 4, 6 7, 8 9 Pin Name C1, C2, C3 E1, E2, E3 Rc, Cc Dchg IN Function LED drive terminals (Open collector outputs) These terminals are used to set the LED drive currents. These terminals are used to set the oscillating frequency of the internal clocks. 10 11 27, 12 13 14 15 16, 17 20 21 23 Dchg OUT Chg SW GND1, GND2 Batt SW Dchg SW Adpt SW Test1, Test2 Batt + Batt – Batt T 22 24 25 26, 30 Vref2 P.C VDET CP1, CP2 29 31 32 33 IDET PCS IN PCS OUT OCSET 34, 35 Iset1, Iset2 These are used to set the charging current. (Iset1 is for quick charge and Iset2 is for the trickle charge.) 36 Vref1 This terminal is sets the standard voltage for over-current set-up value and the charge current set-up. This is an input terminal used to detect the current which is used for the discharge current feedback. This is the drive terminal for the transistor mounted externally for discharge purposes. 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) This is used to detect the discharge SW. (It is pulled up internally) This is used to detect adapter SW. (It is pulled up internally) 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) which are used for phase compensation. This terminal is used to detect the charging current or output current. This is an input terminal used for photo-coupler short. This terminal goes "H" when over-current is detected. This terminal is used to set the over-current detection value when the adapter mode is used. REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 2 of 10 M62256FP Absolute Maximum Ratings (Ta = 25°C, unless specified otherwise) Item Symbol Ratings Unit Condition Power supply voltage Vcc 16 V Chgon terminal drive current IChgon 50 mA Dchgout terminal drive current IDchg –5 mA LED drive current IC1 to IC3 20 mA P.C drive current IP.C 5 mA Vref1 output current Iref1 –1 mA Vref2 output current Iref2 –1 mA Power dissipation Pd 650 mW Thermal derating ratio Kθ 6.5 mW/°C Ta = 25°C Operating temperature Topr –20 to +75 °C Ta > 25°C Storage temperature Tstg –40 to +125 °C 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 0 V to 0.6 V. Electrical Characteristics (Vcc = 7 V, Ta = 25°C, unless specified otherwise) All Device Item Power supply voltage Circuit current Power supply detecting voltage Symbol Vcc Icc VTHVcc Min 3.0 18.0 2.66 Typ — 27.0 2.80 Max 15.0 40.0 2.94 Unit V mA V Conditions Symbol Vref1 Vref2 Min 1.18 1.70 Typ 1.25 1.80 Max 1.32 1.90 Unit V V Symbol Min Typ Max Unit Conditions –1 30 –1 30 –1 — 50 — 50 — — 85 — 85 — µA µA µA µA µA OCSET = 220 mV Excluding charging time When charging Excluding trickle charging time When trickle charging Min — — — 0.5 Typ 0.3 5.2 0.3 0.8 Max 0.6 6.0 0.6 1.2 Unit V V V V Vcc = 7 V when quick charge Reference Item Vref1 output voltage Vref2 output voltage Item 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 IOCSET ISET1-1 ISET1-2 ISET2-1 ISET2-2 Conditions Iref1 = 150 µA Iref2 = 350 µA Driver Item Chgon terminal output L voltage Dchgout terminal H voltage LED output L voltage DchgIN terminal detecting voltage Symbol VsatChg VOHDchg Vsat LED VDchgIN REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 3 of 10 Conditions IChgon = 50 mA IDchgout = 5 mA, Vcc = 7 V ILED = 5 mA M62256FP Control Section Item Range of input voltage Input bias current P.C output L voltage PCS OUT terminal flow out current PCS IN terminal threshold voltage Symbol VIN IBias VPCL IPCSOUT VTHPCSIN Min 0 –1 — –18 0.5 Typ — — 0.2 –10 0.8 Max Vcc — 0.5 –5 1.2 Unit V µA V µA V Conditions IPC = 2 mA When over-current is detected Each SW Detection Terminal Item 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 Symbol IBattSW VTHBatt IDchgSW VTHDchg IAdptSW VTHAdpt Min –240 3.0 –240 3.0 –240 3.0 Typ –140 5.6 –140 5.6 –140 5.6 Max –80 6.0 –80 6.0 –80 6.0 Unit µA V µA V µA V Conditions Vcc = 7 V, VBattSW = 0 V Vcc = 7 V Vcc = 7 V, VDchgSW = 0 V Vcc = 7 V Vcc = 7 V, VAdptSW = 0 V Vcc = 7 V Internal Voltage Set-up Item Set-up output voltage at Adpt mode Symbol VAdpt Min 820 Typ 864 Max 910 Unit mV Set-up output voltage at charge mode VCHG 1.19 1.26 1.33 V Set-up output voltage when overcurrent is detected ISET1 set-up voltage ISET2 set-up voltage OCSET set-up voltage Over-voltage set-up voltage –∆V detection voltage 1 –∆V detection voltage 2 VDOWN 478 504 530 mV VISET1 VISET2 VOCSET VOVP V–∆V-1 V–∆V-2 123 11.4 208 9.0 0.6 60 130 12.0 220 9.5 1.0 100 137 12.6 232 10 1.4 140 mV mV mV V V mV Voltage at the end of discharge VCHGON Temperature detection set-up voltage 1 VTTH1 4.7 0.92 5.0 0.97 5.3 1.02 V V Temperature detection set-up voltage 2 VTTH2 1.06 1.12 1.18 V Over-heating detection set-up voltage VO/H 0.81 0.86 0.91 V Item Oscillation frequency Initialization timer 1 Initialization timer 2 Symbol fosc Tm1 Tm2 Min 9.22 18.0 4.5 Typ 10.24 20.0 5.0 Max 11.26 22.0 5.5 Unit kHz m m Initialization timer 3 Undetected time for –∆V Safety timer 1 Safety timer 2 Over-current detection time Tm3 TNDET Tms1 Tms2 TOC 2.7 2.7 2.7 21.6 9.0 3.0 3.0 3.0 24 10.0 3.3 3.3 3.3 26.4 11.0 m m h h s Note: Conditions When quick charging When trickle charging When adapter mode Within initialization timer After initialization timer has passed Temperature at the start of charging Temperature at the start of recharging Charge stop temperature Conditions Rc = 30 kΩ, Cc = 2200 pF Battery voltage < 5 V 5 V ≤ Battery voltage < 6.5 V Battery voltage ≥ 6.5 V When quick charging When trickle charging The time given to each timer is when the oscillation frequency of 10.24 kHz is used. REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 4 of 10 M62256FP Recommended Operating Condition Item Power supply voltage (Vcc) Charge current Note1 Preliminary charge Quick charge Trickle charge Discharge current Note1 LED drive current Note2 Ratings 3 to 15 50 to 200 0.8 to 2 80 to 200 300 to 500 115 Unit V mA A mA mA mA Notes: 1. The charging current must be set according to the battery specifications. The currents used for quick charge and trickle charge are determined by the voltage of the terminals Iset1 and Iset2 and current sense resistor R4 (Application in page 9). 2. The LED drive current is calculated by the following equation. 200 mV (A) ILED ≈ RL REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 5 of 10 M62256FP 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 battery voltage is below 5 V, the preliminary charging mode starts. When the battery voltage exceeds 5 V, the quick charge commences. On the other hand, if the battery voltage exceeds 5 V, the following will take place. If the battery temperature is less than 55°C, the quick charge will take place. If it is higher than 55°C, the preliminary charge mode will continue until the temperature falls below 55°C. The charge current used for the quick charge is set by Iset1. (3) Initialization timer The initialization timer is set according to table 1. The –∆V is not detected for 3 minutes. Detection of –∆V within the initialization timer is set to 1 V to prevent erroneous detection of –∆V during the initial charging. Table 1 Setting up the Initialization Timer The Initial Battery Voltage Time of Initialization Timer Less than 5 V More than 5 V but less than 6.5 V 20 m 5m 6.5 V or more 3m (4) Charge control When the initialization timer completes its function, detection of –∆V is set to 100 mV 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: (b) Over-heat detection: Charging stops when the battery voltage goes to 9.5 V or higher. Charging stops when the battery temperature becomes 63°C or higher. When the temperature goes to 45°C or lower, it recharges once. (c) Power supply voltage detection: When the power supply voltage goes below 2.8 V, the initial reset takes place. (d) Unplugged power supply cord: When the unplugged power supply cord is detected, the output SW is turned off. (7) Applicable batteries Ni-Cd battery, Ni-MH (nickel-metal hydrogen) battery (∆T/∆t, V taper can not be detected.) REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 6 of 10 M62256FP 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 (7.2 V) 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 7.2 V. (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 s has passed? Yes Output down No 10 s has passed? Yes PCS OUT terminal "H" REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 7 of 10 (4.2 V set) M62256FP 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" 0.7 seconds 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 5 V 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 2.8 V (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 adapter 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. REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 8 of 10 REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 9 of 10 RL3 RL2 RL1 LED3 LED2 LED1 31 PCS IN C2 28 + Vcc L1 32 PCS OUT 30 k 2200 p 8 7 Rc Cc Rc 6 E3 4 E2 2 E1 Cc R1 24 R15 120 R12 R14 35 4.4 k 11.32 k 34 1.06 k 33 26 CP2 16 N.C 30 CP1 29 IDET Chg SW 11 T 23 Batt SW 13 Vref2 22 Batt Batt − 21 Batt + 20 Dchg SW 14 Dchg IN 9 17 N.C 27 12 Q2 R9 9k SW3 SW2 3k 1k R8 D3 D2 R5 SW1 R6 R10 Q1 Dchg OUT 10 R4 0.1 Ω Adpt SW 15 Test2 GND1 GND2 0.1 µ 0.1 µ ISET1 ISET2 Test1 20.6 k R11 36 25 VDET RP2 CP2 RP1 CP1 R3 1.2 k M62256FP R13 P.C P.C L2 R2 8.8 k Vref1 OCSET 5 C3 (Discharge LED) 3 C2 (Charge LED) 1 C1 (Power Supply LED) D1 C1 R7 T − + To Batt To Adapter M62256FP Application Example M62256FP Package Dimensions JEITA Package Code P-SSOP36-8.4x15-0.80 RENESAS Code PRSP0036GA-A Previous Code 36P2R-A MASS[Typ.] 0.5g E 19 *1 HE 36 F NOTE) 1. DIMENSIONS "*1" AND "*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION "*3" DOES NOT INCLUDE TRIM OFFSET. 1 18 Index mark c *2 D A1 A A2 *3 y bp L e Detail F REJ03F0246-0200 Rev.2.00 Jun 16, 2008 Page 10 of 10 Reference Dimension in Millimeters Symbol D E A2 A A1 bp c HE e y L Min Nom Max 14.8 15.0 15.2 8.2 8.4 8.6 2.0 2.4 0.05 0.35 0.4 0.5 0.13 0.15 0.2 0° 10° 11.63 11.93 12.23 0.65 0.8 0.95 0.15 0.3 0.5 0.7 Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Notes: 1. This document is provided for reference purposes only so that Renesas customers may select the appropriate Renesas products for their use. Renesas neither makes warranties or representations with respect to the accuracy or completeness of the information contained in this document nor grants any license to any intellectual property rights or any other rights of Renesas or any third party with respect to the information in this document. 2. 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