AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 FEATURES Reliable Fast Charge Control of NiMH/NiCd Batteries. Quick and Easy Testing for Production. Fast Charge Termination by: 1. Accurate -∆V Detection Level with Respect to Peak Battery Voltage Value. AIC1761 ................……………........ -1% AIC1766 ............…………..……...... -0.25% 2. Peak Voltage Timer (0∆V). Adjustable Fast Charge Safety Timer. Protection against Temperature Fault. Protection against Short-Circuited and Open Batteries. Wide Operation Voltage Range: 9V to 18V, no Extra Regulator Needed. Large Battery Voltage Detection Range: 0.65V to 3.7V. LED Drivers to Indicate Charge Status or Fault Conditions. Voltage Reference Output. Space-Saving Packages: 8-PIN DIP, SO 14-PIN DIP, SO APPLICATIONS Battery Chargers for : Mobile Phones Notebook and Laptop Personal Computers Portable Power Tools and Toys Portable Communication Equipments Portable Video and Stereo Equipments DESCRIPTION The AIC1761/1766 fast charge controller IC is designed for intelligent charging of NiMH or NiCd batteries without overcharging. It detects a voltage drop (-∆V) occurring in the final stage of a fast charging cycle and correspondingly controls the charging current. Fast charge can also be cut off by a peak voltage timer (0∆V). The detection of -∆V is a very reliable method to terminate fast charging for NiMH and NiCd batteries. The AIC1761/1766 uses -∆V detection as one of primary decisions for fast charge cut-off. The ∆V value for the AIC1761 is as small as 16mV per cell, suitable for NiCd batteries. The -∆V value for the AIC1766 is as small as 4mV per cell, particularly suitable for NiMH as well as the NiCd batteries. The peak voltage timer is particularly useful when the voltage drop at the end of charge for some batteries, e.g. NiMH cells, is not pronounced enough for reliable detection. An adjustable safety timer (3 settings) is used as a backup termination method. Provisions are made with the AIC1761/1766 to prevent fast charge under temperature fault conditions. Two LED outputs are used to indicate the charging status. Another flash LED output can be used alone to indicate charge status. AC mode allows the battery to drive its loads while being charged. Test mode is provided to dramatically reduce production test time. ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 TYPICAL APPLICATION CIRCUIT VIN R8 470 12 ~ 15 V C1 10µF + R1 120 0.5W L1 220µH + C2 470pF BST SC 8 D2 1N5819 C4 IS 3 TC VCC 6 FB 5 C7 LED1 RED 100µF BATTERY 3 ~ 5 CELLS 1K R9 1K 0.33Ω 1W 220µF R3 100K R7 150K 7 2 SE 4 GND C3 1µF + D4 1N5819 *RS + ZD1 9.1V R5 D1 1N4148 1 D3 1N4148 R2 1K C6 0.1µF R4 51K VREF 2 GND VDD 7 C5 3 TIMER VOUT 6 4 MODE LED 5 AIC1563 R10 1K 8 4.7µF + *Fast Charge Current= (0.3/RS) A 1 VBT LED2 GREEN AIC1761/66 Simple Battery Charger for NiMH / NiCd Battery ORDERING INFORMATION AIC176X-XXXX PIN CONFIGURATION ORDER NUMBER VERSION 08: 8 PIN VERSION 14: 14 PIN VERSION PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0°C~70°C -∆V DETECTION LEVEL 1: -1% 6: -0.25% AIC1761-CN08 AIC1766-CN08 (PLASTIC DIP) TOP VIEW AIC1761-CS08 AIC1766-CS08 (PLASTIC SO) AIC1761-CN14 AIC1766-CN14 (PLASTIC DIP) VBT 1 8 VREF GND 2 7 VDD TIMER 3 6 VOUT MODE 4 5 LED TOP VIEW AIC1761-CS14 AIC1766-CS14 (PLASTIC SO) GND 1 14 GND TIMER 2 13 NC MODE 3 12 VBT LED 4 11 NC VOUT 5 10 VREF NC 6 9 VNTC FLASH 7 8 VDD ABSOLUTE MAXIMUM RATINGS Supply Voltage .......................…………….......................................................................... 18V DC Voltage Applied on any Pin ..............................................…………….............................. 18V Sink Current of VOUT Pin, LED Pin, and FLASH Pin Operating Temperature Range ...............................…………….........20mA ...........................................…………........................ 0°C to 70°C Storage Temperature Range ..............................................……………................. -65°C to 150°C ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 2 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 TEST CIRCUIT - 150K R2 4.7µF C1 Voltage Source + +VDD 150K R3 VDD VBT + 0.1µF C2 0.1µF C3 + 100µF C4 390K R1 VOUT GND 1.5K R6 LED +VDD TIMER 1.5K R7 FLASH VREF 20K R5 4.7K R4 1.5K R8 MODE VNTC ELECTRICAL CHARACTERISTICS (VDD=12.5V, Ta=25°°C, unless otherwise specified.) PARAMETER TEST CONDITIONS SYMBO L Supply Voltage VDD Supply Current IDD MIN. TYP. MAX. UNIT 18 V 1.5 mA 9 -∆V Detection Level w.r.t.* Peak Value AIC1761 -1 % AIC1766 -0.25 % Voltage Protection Limits Battery Low VBT Battery High 0.5 0.65 0.8 V 3.5 3.7 3.9 V Input Impedance of TIMER Pin ZTIMER 100 KΩ Input Impedance of MODE Pin ZMODE 100 KΩ RLED 1 MΩ Output Resistance of LED Pin Fast Charge Trickle Charge Output Resistance of VOUT Pin Fast Charge RVOUT 25 Ω 25 Ω MΩ 1 Trickle Charge FLASH pin Output Resistance Fast Charge RFLASH 25 Ω Frequency Trickle Charge FFLASH 1 Hz DFLASH 50 % VREF 5.85 V Duty Cycle Reference Voltage IREF 1.5 Under-Temperature αNTCL 0.60 0.7 0.80 VREF Over-Temperature αNTCH 0.15 0.2 0.25 VREF Reference Source Current Temperature Fault Voltage Limits as Fraction of VREF mA *w.r.t.: with respect to ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 3 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 TYPICAL PERFORMANCE CHARACTERISTICS Output Resistance of VOUT pin vs Power Supply Voltage (Fast Charge Mode) 32 28 28 RLED (Ω) RVOUT (Ω) 32 Output Resistance of LED pin vs Power Supply Voltage (Trickle Charge Mode) 24 24 20 20 11 9 13 15 17 18 9 11 13 VDD(V) 18 Output Resistance of VOUT pin vs Temperature (Fast Charge Cycle) 32 34 28 30 RVOUT (Ω) RFLASH (Ω) 17 VDD(V) Output Resistance of FLASH pin vs Power Supply Voltage (Fast Charge Mode) 24 20 15 26 9 11 13 15 17 22 18 0 20 VDD(V) Output Resistance of LED pin vs Temperature (Trickle Charge Cycle) 6.0 VREF (V) 30 RLED (V) 6.2 26 22 40 80 5.8 5.6 20 60 VREF Reference Voltage vs Temperature 34 0 40 Temperature (°C) 60 80 0 20 40 60 80 Temperature (°C) Temperature (°C) ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 4 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 TYPICAL PERFORMANCE CHARACTERISTICS (CONTINUED) VBT (Low) Limit vs Temperature 3.8 0.71 3.7 0.67 VBT (V) VBT (V) VBT (High) Limit vs Temperature 3.6 0.63 0.59 3.5 (V) 3.4 0 20 40 60 0.55 80 0 20 40 60 80 Temperature (°C) Temperature (°C) Safety Timer vs Temperature (MODE pin = VDD) Safety Timer (min.) 45 43 41 39 37 35 0 20 40 60 80 Temperature (°C) BLOCK DIAGRAM VREF VNTC (for 14 pin version) VR4 VR3 VDD Voltage Regulator + - + LED Power On Reset - GND VR1 FLASH (for 14 pin version) + - CHARGE CONTROL VBT VR2 VOUT STATE MACHINE + - 13-Bit ADC Timing Control Mode Select MODE Oscillator TIMER ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 5 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 PIN DESCRIPTIONS VDD PIN - Supply voltage input. LED PIN GND PIN - Ground. VOUT PIN - Output, for LED indicator. VBT PIN - Input, to sense battery voltage. FLASH PIN - Output, for LED indicator. MODE PIN - Input, to set IC operation mode. TIMER PIN - Input, for safety timer control. VREF PIN Voltage reference output. - - Output, for LED indicator. (Available for 14-pin version only.) VNTC PIN - Input, for temperature protection. (Available for 14-pin version only.) APPLICATION INFORMATIONS BATTERY PROPERTIES The basic principle of rechargeable battery systems, including NiMH and NiCd cells, is that the processes of charge and discharge are reversible. The charge characteristics of NiMH and NiCd cells look similar in that (1) the cell voltage at the end of charge drops and (2) the cell temperature increases rapidly near the end of charge. Fig. 1 shows the charge voltage and charge temperature characteristics of NiMH and NiCd cells. Notice that the cell voltage decline of NiMH cells at the end of charge is less pronounced than for NiCd cells. 1.7 1.5 60 Voltage 1.4 50 1.3 40 NiMH Temperature NiCd 1.2 1.1 0 20 40 60 80 100 30 Cell Temperature (°C) Cell Voltage (V) 70 NiMH NiCd 20 Time (min.) Fig. 1 Typical Charge NiMH/NiCd Battery Characteristics Negative delta voltage cutoff (-∆V). Peak voltage timer cutoff (0∆V). Maximum temperature cutoff (TCO). Maximum voltage cutoff (VCO). Safety timer cutoff. The principle of operation of the AIC1761/1766 is described in the following section. THE AIC1761/1766 OPERATION 80 Charge Current=1C 1.6 The AIC1761/1766 is a battery fast charge controller IC that utilizes the following methods to terminate the fast charge process for NiMH or NiCd battery cells: of Fast-charge batteries are available where recharging takes for only 1 hour or less with a simple control circuit. One main purpose of the control circuit is to terminate the fast-charge process to prevent the temperature and internal pressure of the battery cell from building up to a damaging level which degrades or even destroys the battery cell. When power is first applied to the charge system, consisting of rechargeable battery cells, charge current source, the AIC1761/1766 and its associated external circuit, all internal digital circuit blocks of the AIC1761/1766 are reset by internal power-onreset circuitry. The internal control unit then checks the battery condition to prevent fast charge from taking place under battery fault conditions, i.e. cell voltage fault (VBT<0.65V or VBT>3.7V) or cell temperature fault (αNTC>αNTCL or αNTC<αNTCH, for the 14-pin version). Temperature fault limits corresponding to αNTCL and αNTCH are determined by an external thermistor divider circuit as included in the Application Examples, Fig. 10. After the battery passes condition fault checks, VOUT pin goes to low to start fast charge while initial timer and safety timer of the AIC1761/1766 start counting. Both the negative delta voltage detector and the peak voltage timer, however, are disabled until the initial timer period in the initial stage of a charge circle elapses. ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 6 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 The AIC1761/1766 constantly monitors the voltage at VBT pin, which rises as battery cells are being fast-charged till battery full condition is nearly approached. The battery temperature is also constantly being sensed to guard against abnormal temperature situations. VOUT pin will be pulled high by an external pull-up device and the fast charge process be switched to trickle charge when one of the following situations is encountered: The battery voltage stays at its peak value for the duration determined by the peak voltage timer setting (0∆V). The VBT pin voltage exceeds the “high” battery voltage protection limit (VCO). If 0.65V<VBT<3.7V NO YES -∆V detector & peak voltage timer start working after initial period ends. -∆V detector & peak voltage timer working. If αNTCL>αNTC & αNTC>αNTCH NO YES If 0.65V<VBT<3.7V The selected safety timer period has finished. YES TIMER PIN VOUT goes high for trickle charge, -∆V detector reset, safety timer stops. VOUT goes high for trickle charge, NO Safety Timer and -∆V Detector reset If safety timer period has finished. The TIMER pin can be used as follows to select one of the preset safety timer period and its corresponding periods of initial timer and peak voltage timer: YES NO NO Safety Timer VOUT goes high for trickle charge , -∆V detector reset, safety timer stops. If αNTCL>αNTC & αNTC>αNTCH The battery temperature, sensed by the thermistor divider, exceeds the fault temperature range (TCO). TIMER Pin VOUT goes high for trickle charge, safety timer and NO -∆V detector reset. YES VOUT goes low for fast charge, safety timer starts counting. A negative delta voltage (-∆V) at VBT pin is detected when compared to its peak value. The sampling rate of -∆V detection is 2seconds/ sample. The detection level of -∆V is -1% for the AIC1761 and -0.25% for the AIC1766. Power ON If -∆V decline of VBT is detected. NO If peak voltage timer period has finished. YES Peak Volt- Initial Timer age Timer VDD 40 min. 2 min. 1.5 min. GND 80 min. 4 min. 3.0 min. Floating 160 min. 8 min. 3.0 min. YES VOUT goes to high, fast charge finished, and trickle charge start. Fig. 2 Operation Chart of the AIC1761/1766 ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 7 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 MODE PIN 1. Safety timer reduced by 512 times. The MODE pin determines the mode in which the IC works: 2. Initial timer reduced by 512 times. MODE Pin Mode Floating NORMAL Normal operation VDD TEST 1/512 safety timer GND AC −∆V detector reset, timer stops (not reset) 3. Peak timer reduced by 64 times. Function The AIC1761/1766 will operate normally when the MODE pin is left floating ( a 0.1µF capacitor is recommended to be tied to MODE pin if the charge circuit works in a noisy environment). The AIC1761/1766 otherwise works in following ways if the MODE pin is biased either to VDD or to GND: (A) AC Mode (MODE pin biased to GND) In the midst of normal charge operation, where VBT pin voltage is in the range from 0.8V to 3.5V and the preset safety timer has not run out, the safety timer will stop if the MODE pin is somehow pulled down to GND level. As long as the MODE pin remains low, the VOUT pin stays ON and LED pin OFF regardless whether the battery pack voltage declines (-∆V present) or not. The AC mode can be activated by pulling MODE pin to GND to avoid premature battery charge cutoff due to fluctuating charge current source. Switching MODE pin after the end of the safety timer has no effect on the AIC1761/1766 display outputs, i.e., VOUT pin stays OFF while LED pin stays ON. One critical requirement needs to be observed for -∆V detector of the AIC1761/1766 to work properly in TEST mode. That is, VBT pin voltage must be kept between approximately 2.8V to 3.3V, rather than 0.8V to 3.5V in NORMAL mode. If the TEST mode function is to be utilized in production test, it has to be well planned and included in circuit design phase to make the voltages of VBT pin and MODE pin externally controllable. In addition, an externally controllable TIMER pin can further reduce test time required for testing the AIC1761/1766 in TEST mode. Fig. 3 shows the timing diagram for externally controlled VBT, TIMER, and MODE pin voltages of a recommended AIC1766 charge circuit production test scheme, utilizing TEST mode function. Output waveforms of VOUT and LED pins (and FLASH pin for 14 pin version) of a properly functioning AIC1766 are also shown in the figure. In timer segments 4, 8 and 10, VOUT pin should change from ON to OFF, LED pin from OFF to ON, and FLASH pin from ON to flashing output (approximately 4 Hz). For the reset of time, VOUT pin should remain ON, LED pin OFF, and FLASH pin ON. (B) TEST Mode (MODE pin biased to VDD) An unique feature of the AIC1761/1766 is that it can be put into a TEST mode by pulling the MODE pin to VDD, allowing verification tests for the AIC1761/1766 charge circuit to be performed in a few tens of seconds, extremely valuable in final phase of production. When the AIC1761/1766 is in TEST mode, all the internal timers are reduced by the following factors when compared to normal operation: ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 8 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 Init. VBT Timer Set Up TIMER Pin AC Mode VBT Set Up AC Mode -∆V Test (min. 3.75S) Safety Timer Test VDD/2 VDD GND MODE Pin VDD 3V VBT Pin Peak Timer Test (min.1.875S) GND GND 3V 2.995V 2.98V 2.995V *2.988V 2.8V OFF VOUT Pin ON LED Pin OFF ON FLASH Pin * ON 4.27Hz TIME 0.5S 0.4S 1.5S 1.5S 20mS 0.4S 4.7S 1.5S 20mS 2.5S 0.5S Section 1 2 3 4 5 6 7 8 9 10 11 2.972V for the AIC1761 Fig. 3 Timing Diagram of AIC1766 in Test Mode ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 9 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 R14+R13 must be greater than 535KΩ if R15 is 150KΩ (refer to Fig. 4). When the battery pack is disconnected from the charging circuitry the VBT pin voltage must be higher than 4.0V, dictating VBAT node voltage of the charging circuitry to be higher than 18.3V (4V x 4.57). Practically, however, the charging circuit supply voltage +VIN should be higher than 18.5V in order to ensure proper operation. In the case that supply voltage +VIN can not meet this requirement, application circuit of Fig. 4 can be adopted to get around this problem. The LED indicators work as the following table: LED PIN VOUT PIN FLASH PIN Fast Charge OFF ON ON Trickle Charge ON OFF FLASH VBT Abnormal OFF OFF OFF LED pin is used in conjunction with VOUT pin while FLASH pin works alone. +VIN Referring to the APPLICATION EXAMPLES (Fig. 10), the temperature limits beyond where the fast charge is prohibited can be set by choosing values for resistors and the thermistor of the thermistor divider according to the following formula: 27K VBAT 9012 Q2 R2 150K R13 270K 9012 Q1 R18 = 3.57 RT1 RT2/ (RT1 - RT2) R3 R19 = 10 RT1 RT2 / (1.218 RT1 - 11.2 RT2) RT1 : Thermistor resistance at low temperature limit. RT2 : Thermistor resistance at high temperature limit. BATTERY VOLTAGE DIVIDER To ensure proper operation of the AIC1761/1766, selection of resistor values for battery voltage divider must meet the following two crucial requirements: 1. When the battery pack is disconnected from the charge circuitry, the voltage of VBT pin must be higher than 4.0V or lower than 0.5 V to put the AIC1761/1766 in reset status, where VOUT and LED pins become high impedance and FLASH pin (only for 14 pin version) goes to high level. R14 0.1µF C1 R7 R5 270K VBT 150K + 0.1µF C3 150K R15 4.7µF C2 GND Fig. 4 Battery Voltage can be Raised to VIN - 0.9V when being Charged. CHARGER CIRCUIT DESIGN TIPS 1. A stable constant charge current is crucial for reliable precision −∆V detection by the AIC1761/1766 since fluctuation of the charge current can cause fluctuation of the battery terminal voltage due to battery internal series resistance, which will likely result in errors −∆V detection by a properly functioning AIC1761/1766. 2. To prevent the AIC1761/1766 from overvoltage damage, make sure that none of AIC1761/1766 pins sees any voltage beyond the supply voltage, which needs to be between +9V and +18V. 2. When the battery pack is connected in normal operation, the VBT pin voltage must remain in the range of 0.8V to 3.5V even when the battery pack voltage reaches to its peak when near full charge. Take charging a 8-cell battery pack as an example. The highest voltage would be 16V when fully charged if the highest voltage of a fully charged battery cell is assumed to be 2V. Since the VBT pin voltage is restricted to be no higher than 3.5V, the battery voltage divider ratio must be higher than 3.57 (16V/3.5V -1). In other words, resistor 390K ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 10 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 Since the AIC1761/1766 is fabricated with CMOS process, cares must be taken in handling this device to avoid possible damage from electro-static discharge. Charge Current=0.7A Cell Capacity=700mAH 50 1.6 Voltage 40 1.5 Temperature 30 1.4 AIC1766 1.3 0 20 40 60 Cell Temperature(°C) 5. Critical components need to meet adequate rating to prevent heating-up of these components from causing circuit malfunction. 60 1.7 20 80 Charge Time (min.) EXPERIMENTAL RESULTS Fig. 6 Charge Characteristics of NiCd Battery 60 1.6 Charge Current = 1A Cell Capacity =1000mAH 1.5 50 Cell Voltage(V) Experiments have been conducted to verify the AIC1761/1766 operation with NiCd and NiMH battery cells of various brands. Actual results shown in the following figures clearly indicate that the negative delta voltage detector and the peak voltage timer of the AIC1761/1766 have precisely detected the tiny cell voltage drops or the cell voltage peaks and subsequently terminated the fast charge process after batteries are fully charged. The battery cell temperatures were all under safety levels. Note that the fast charge for the NiMH battery in Fig. 5 is terminated by the peak voltage timer (0 ∆V ) while the fast charge for the NiCd battery in Fig. 6 is terminated by the -∆V detector. Voltage 40 1.4 Temperature 1.3 30 Cell Temperature(°C) 4. If the battery charge current is high, say, over 1.5A, quality of circuit board layout and wiring connection points become increasingly important in the charger circuit reliability. Cell Voltage (V) 3. AIC1761 1.2 0 10 20 30 40 50 60 20 70 Charge Time (min.) Fig. 7 Charge Characteristics of NiMH Battery 1.6 Cell Voltage (V) Voltage 40 1.4 Temperature 30 1.3 AIC1766 20 1.2 0 20 40 60 1.7 60 Charge Current=0.7A Cell Capacity=700mAH 50 1.6 Voltage 40 1.5 30 1.4 AIC1761 80 Charge Time (min.) Temperature 1.3 Fig. 5 Charge Characteristics of NiMH Battery Cell Temperature(°C) 50 Cell Voltage(V) AIC1766 1.5 Cell Temperature(°C) 60 Charge Current = 1A Cell Capacity = 1000mAH 20 0 20 40 60 80 Charge Time (min.) Fig. 8 Charge Characteristics of NiCd Battery Both Fig. 5 and Fig. 6 were obtained by using the AIC1766. Results of similar experiments by using the AIC1761 are shown in Fig. 7 and Fig.8. ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 11 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 APPLICATION EXAMPLES R8 +VIN 12~28 V D1 1N4148 + C1 220µF 35V 1 SC BST SE IS 2 3 TC VCC 4 C2 1nF GND FB 8 D3 1N4148 R2 1.2K R1 2K *L1 220µH C3 4.7µF + 50V D4 1N5819 **RS + D2 1N5819 470 C4 220µF 35V 0.33Ω 1W R4 1K R6 51K R7 150K + C5 4.7µF C6 0.1µF 1 2 3 4 5 *L1=MPP Core or Iron Powder Core **Fast Charge Current:(0.3/RS)A LED1 RED LED2 GREEN R9 1K 6 AIC1563 C7 100µF # BATTERY R5 100K 7 + ZD1 9.1V VBT VREF GND VDD TIMER VOUT LED MODE # 3~5 Cells for VIN=12~28V # 3~6 Cells for VIN=15~28V R10 1K Q1 2N3904 8 7 D5 1N4148 6 5 AIC1761/66 Fig. 9 Battery Charge Circuit for NiMH/NiCd Battery with Wide Range Input Voltage A1012 Q1 +VIN L1 R1 1N5819 D1 400µH 1N5819 D2 470 VBAT C8 0.1µF R17 330 12 8 11 R8 4 7 5 6 16 LED2 GREEN R11 494 14 13 15 3 VREF 2K 2 390K MODE R9 10K 1.5K 1 VDD TIMER R18 AIC1766 LED1 RED VNTC LED BATTERY 10 R14 R13 1.5K THERMISTOR 9 ZD1 16V R19 R4 560 R6 + C2 1nF R3 6.8nF R5 5.1K 33K 27K R7 1.1K Q2 9014 R10 20K R12 1.7K VOUT C5 0.1uF C3 C1 220µF 25V + C4 100µF 25V VBT GND C6 0.1µF R16 150K C7 4.7µF 6.3V + R15 150K VB- R2 GND 0.2 Note: VIN should be higher than 10V, ZD1 is required when VIN exceed 18V. Fast charge current is approximately 1A. Adjustable through R7. Trickle charge current is adjustable through R12 Fig. 10 Step-Down Rechargeable Battery Charger ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 12 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 APPLICATION EXAMPLES (CONTINUED) ZD1 GND FB D3 AIC1630 33K R9 100K C3 VDD TIMER VOUT MODE LED 1N4148 100K R6 Charging current =0.8A (RIF sets the Charging Current) FIG. 11 + 1.5K R13 1.5K R12 AIC1761/1766 10nF Note: VREF GND 22K C6 R7 0.82 RIF 0.1µF C5 VBT R11 120K 12K R2 R5 C1 100µF C4 Trickle LBO + 4.7µF LBI EXT R3 + C2 1N4148 VOUT VIN + 100µF 4.7V Q1 IRFD020 SD 33K VBAT R4 220µF R1 240K D2 150 +VIN (VIN < VBAT) 220 R10 Charging Battery Pack IN5819 L1 50µH 2A FUSE D1 VIN must be lower than VBAT. Short Circuit Condition is protected with a 2A Fuse. Step-Up Rechargeable Battery Charger + 2N3904 R2 750 AIC1630 FIG. 12 GND TIP32C Q3 220 9014 Q1 4.7K R6 0.1µF 9014 Q4 2 R7 10 R9 R10 VBAT 0.1µF C5 + C6 100µF 390K 150K + VBT R11 150K R1 20K 9014 Q2 LED Q6 9014 9V ZD1 1N4001 680 R5 C1 MODE AIC1761/1766 120 R15 VBAT C2 BATTERY 4.7µF 2~8 cells R3 10K R2 VOUT RIF sets Fast Charge Current, RIT sets Trickle Charge Current Typical Efficiency = 75%. With Short Circuit Protection. R4 D1 +VIN 9~18V VDD TIMER Step-Up/Down Rechargeable Battery Charger R10 330 VREF VBT + C3 4.7µF 120K R15 Note: Fast Charge Current = 0.8A @VIN<VBAT =(VIN - VBAT - 0.5)/0.82 @VIN>VBAT Trickle charge Current = 30mA. 1.5K R14 1.5K R13 120K R11 22K R9 RIF 0.82 0.1µF C5 Trickle FB 2N2222 Q4 2N3904 Q5 + Charging GND 12K R5 Q2 100µF C4 C3 GND TIMER R8 MODE VREF 1.5K R12 VDD VOUT LED 1.5K R14 10K R13 9014 Q5 Charging LBO C2 RIT 75K R6 330 100K LBI EXT + 220µF VOUT VIN 240K R4 VIN (+VIN can be either higher or lower than the battery voltage.) 220 R12 Trickle + C1 100µF SD 47K R3 Battery Pack 0.1µF ZD1 150 R1 TIP42C Q3 4.7V L1 IRFD020 Q1 50µH IN5819 D2 AIC1761/1766 Note: VIN=9V~18V for 2~8 cells Fast Charge Current=400mA ( FIG. 13 V BE 0.65 ≅ ) R7 / /R8 R7 / /R8 Step-Down Low-Side Current Sense Pulse Battery Charger ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 13 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 APPLICATION EXAMPLES (CONTINUED) IN4001 VBAT of Battery 150 9012 Q1 R3 To VBT pin of AIC1761/1766 9014 Q2 12K R1 R5 33 2W Final Voltage of Battery R26 6V 6.8K 5V 5.1K 4V 3.9K 3V 2.7K R26 3.9K 9014 Q3 1K R2 S1 Note: The final voltage of battery is determined by R26. Discharge current is decided by R5. S1: Push to initiate discharge Fig. 14 Discharge Circuit of Rechargeable Battery +VIN 2.4K R4 0.1µF 330K R2 4.7M R1 9014 Q1 C33 4.7M R33 100K R5 VDD TIMER MODE AIC1761/1766 9014 Q2 VOUT VREF LED VBT GND GND Note: Fig. 15 Frequency (about 1Hz) is determined by R33 and C33. LED will flash when LED pin goes low. Flashing-LED Circuit for Trickle Mode +VIN 1M R1 1nF 100K R2 Q1 9014 C33 240K R33 100K R4 10K R5 To Buzzer Q2 9014 VDD TIMER MODE AIC1761/1766 VOUT VREF LED VBT GND GND Note: Fig. 16 Frequency (about 1Hz) is determined by R33 and C33. Buzzer will be activated when LED pin goes low. Buzzer Circuit for Trickle Mode ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 14 AIC1761/1766 BATTERY CHARGE CONTROLLER SPEC NO: DS-1761-02 PHYSICAL DIMENSION 8 LEAD PLASTIC DIP 8 LEAD PLASTIC SO 4.80±0.20 9.3±0.3 6.0±0.2 3.8±0.2 6.2±0.2 8.0±0.5 1.27±0.10 0.6±0.3 3.2±0.3 8.5±1.0 0.5±0.1 2.54±0.10 0.45±0.10 14 LEAD PLASTIC DIP 0.2 ± 0.1 1.5±0.2 2.5±0.1 10°max 0.015X45° 0.25±0.10 3.3±0.1 8° max. 14 LEAD PLASTIC SO 8.6±0.2 6.2±0.2 8.0±0.5 3.3±0.1 3.2±0.1 0.38 ×45° 1.27±0.10 0.6±0.3 1.5±0.2 0.25±0.1 10° max. 8.5±1.0 0.45±0.05 2.54±0.10 0.2±0.1 1.5±0.5 0.5±0.1 6.0±0.2 3.8±0.2 19.0±0.5 0.25±0.10 8° max. UNIT: mm ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 15