AME. 1A Single Cell Li-ion Battery Linear Charger AME2056. n General Description. n Applications. n Features

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1 2056 n General Description The 2056 is constant-current/constant-voltage linear charger IC for single cell lithium-ion batteries. The battery charge termination voltage is fixed at 4.2V, the charge current can be programmed an external resistor up to 1000mA(Max.). In the trickle charge mode, the trickle charge voltage is 2.9V that automatically terminates the charge cycle when the charge current drops to 1/10 the programmed value after the final float voltage is reached. Other features includes Thermal Shutdown, Softstart Function, Battery temperature detector, under-voltage lockout, automatic recharge and two Status indication for Charge Status, no battery and battery failure indicators. n Applications l Charging docks, charging cradles l Low Cost and Small Size Chargers l Cellular phones n Features l Standalone Li-Ion Battery Charging l Programmable Charge Current l Charge Termination Voltage: 4.2V(Typ.) l Trickle Charge Voltage: 2.9V(Typ.) l Standby Current: 55µA(Typ.) l No Sense Resistor or Blocking Diode Required l Constant-current/constant-voltage Operation l Automatic Recharge l Battery temperature Detector l C/10 Charge Termination l Two Status indication for Charge Status, no battery and battery failure indicators l Soft-start Function l Thermal Shutdown l Available in SOP-8/PP, MSOP-8, SOT-25, TSOT-25A and DFN-8D(2x2x0.75mm) Package l Green Products Meet RoHS Standards 1

2 2056 n Typical Application VCC=5V 0.4Ω 10uF V CC CE BAT 10uF R1 Bat- Bat+ 1K 1K CHRG TEMP NTC STDBY PROG R2 Li-ion R PROG n Functional Block Diagram 145 o C 4 VCC T A T DIE 1 80%V IN TEMP T TEMP + - MA VA + 5uA R1 BAT 5 45%V IN T TEMP - CA + 8 schmitt SHDN C1 + - R3 6 STDBY 1V R4 7 CHRG C2 + - C3 + TO BAT 3uA VCC - - R2 CE REF 1.22V 0.1V R5 2.9V 2 PROG GND 3 R PROG 2

3 2056 n Pin Configuration SOP-8/PP Top View MSOP-8 Top View AZA AQA 1. TEMP 1. TEMP 2. PROG 2. PROG GND 4. VCC GND 4. VCC 5. BAT 5. BAT STDBY 7. CHRG 8. CE STDBY 7. CHRG 8. CE * Die Attach: * Die Attach: Conductive Epoxy Conductive Epoxy SOT-25/TSOT-25A Top View DFN-8D Top View (2x2x0.75mm) AEV 1. CHRG AVA 1. TEMP GND 3. BAT 4. VCC PROG 3. GND 4. VCC PROG BAT 6. STDBY 7. CHRG 8. CE * Die Attach: * Die Attach: Conductive Epoxy Conductive Epoxy 3

4 2056 n Pin Description Pin Number SOP-8/PP MSOP-8 DFN-8D SOT-25 TSOT-25A Pin Name Pin Description 1 N/A TEMP Temperature sense Input PROG GND Charge Current Setting and Charge Current Monitor Pin. Ground. 4 4 VCC Input Supply Voltage N/A BAT STDBY Battery Connection Pin. Charge Terminatel Status Output. 7 1 CHRG Open-Drain Charge Status Output. 8 N/A CE Chip Enable Input. 4

5 2056 n Ordering Information 2056 x x x x Special Feature Number of Pins Package Type Pin Configuration Pin Configuration Package Type Number of Pins Special Feature A 1. TEMP E: SOT-2X A: 8 N/A: SOT-2X (SOP-8/PP) 2. PROG Q: MSOP V: 5 K: 0.9mm max height (MSOP-8) 3. GND V: DFN (for TSOT-2XA Only) (DFN-8D) 4. VCC Z: SOP/PP 5. BAT 6. STDBY 7. CHRG 8. CE A (SOT-25) (TSOT-25A) 1. CHRG 2. GND 3. BAT 4. VCC 5. PROG 5

6 2056 n Absolute Maximum Ratings Parameter Maximum Unit Input Voltage -0.3 to +6 V PROG Pin Voltage -0.3 to (V CC +0.3V) V BAT Pin Voltage -0.3 to +6 V All Other Pins 0.3 to +6 V BAT Pin Current 1.2 A Electrostatic Discharge (HBM) 2 KV Electrostatic Discharge (MM) 200 V Electrostatic Discharge (CDM) 1000 V Junction Temperature 150 Storage Temperature Range -65 to +150 o C n Recommended Operating Conditions Parameter Symbol Rating Unit Ambient Temperature Range T A -40 to +85 Junction Temperature Range T J -40 to +125 o C Input Supply Voltage V CC 4.5~5.5 V 6

7 2056 n Thermal Information Parameter Package Die Attach Symbol Maximum Unit Thermal Resistance* (Junction to Case) θ JC 19 o C / W Thermal Resistance (Junction to Ambient) SOP-8/PP Conductive Epoxy θ JA 84 Internal Power Dissipation P D 1450 mw Thermal Resistance* (Junction to Case) θ JC 80 o C / W Thermal Resistance (Junction to Ambient) MSOP-8 Conductive Epoxy θ JA 206 Internal Power Dissipation P D 625 mw Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) SOT-25 TSOT-25A Conductive Epoxy θ JC 81 θ JA 260 o C / W Internal Power Dissipation P D 400 mw Thermal Resistance* (Junction to Case) θ JC 22.8 o C / W Thermal Resistance (Junction to Ambient) DFN-8D Conductive Epoxy θ JA 114 Internal Power Dissipation P D 880 mw Lead Temperature (Soldering, 10 sec)* 350 o C 7

8 2056 n Electrical Specifications Typical values V CC =5V with typical T A = 25 o C, Unless otherwise specified. Parameter Symbol Test Condition Min Typ Max Units VCC Operating Range V CC V Supply Current I CC Charge mode, R PROG =1.2K ua Standby Current I STBY Standby mode(charge end) ua ua Shutdown Current I SHUT (R PROG =NC, V CC <V BAT Shutdown mode or V CC <V UVLO) Float Voltage V FLOAT T A =25 o C, I BAT =40mA V Maximum Battery Current I BAT(MAX) SOT-25 / DFN-6D / DFN-8L ma SOP-8/PP / MSOP ma I BAT1 R PROG =2.4KΩ, CC mode V BAT =4V ma BAT Pin Current I BAT2 R PROG =1.2KΩ, CC mode V BAT =4V ma I BAT3 Standby mode, V BAT =4.2V -6 ua I BAT4 Shutdown mode (R PROG =NC) ±2 ua I BAT5 Sleep mode, V CC =0V -2 ua Trickle Charge Current I TRIKL V BAT <V TRIKL,R PROG =1.2KΩ 130 ma Trickle Voltage V TRIKL R PROG =1.2KΩ, V BAT Rising V Trickle Voltage Hysteresis V TRILK_HYS mv VCC UVLO Rising Threshold Voltage V UVLO V CC :Low to High V VCC UVLO Hysteresis V UVLO_HYS mv VCC-VBAT lockout Threshold Voltage C/10 Charge Termination Current Threshold V ASD I TERM V CC :Low to High mv V CC :High to Low mv R PROG =2.4KΩ 70 ma R PROG =1.2KΩ 130 ma 8

9 2056 n Electrical Specifications (Contd.) Parameter Symbol Test Condition Min Typ Max Units PROG Pin Voltage V PROG R PROG =1.2KΩ, CC mode V CHRG Pin Output Low Voltage V CHRG I CHRG =5mA V STDBY Pin Output Low Voltage V STANBY I STDBY =5mA V Temp Pin High Threshold Voltage V TEMP-H %V CC Temp Pin Low Threshold Voltage V TEMP-L %V CC Recharge Threshold Voltage R ECHRG V FLOAT -V RECHRG mv Temperature Limit T LIMT 145 o C ON Resistance R ON 650 mω Soft Start Time t SS 400 us Recharge Battery Time t RECHRG V BAT :High to Low ms Battery Termination Detect Time t TERM I BAT falling (less than I CHRG /10) ms I PROG Pin Pull-up Current I PROG _pull_up 2 ua 9

10 2056 n Detailed Description The 2056 is a linear battery charger designed for single cell lithium-ion batteries. The charger has CC/CV modes with programmable charging current. Charging current is programmed by an external resistor. No blocking diode or external sense resistor are required. State Diagram of A Typical Charge Cycle A charge cycle starts when the V CC pin voltage rises above the UVLO threshold. If the voltage at BAT pin is smaller than 2.9V, the charger is operating in trickle mode supplies 1/10 programmed current to the battery. When the BAT pin voltage is greater than 2.9V, the charger enters constant-current mode. The charger supplies the programmed current to the battery. When the voltage at BAT pin approaches the float voltage (4.2V), the charger operates in constant-voltage mode and the charging current is decreased. A charge cycle is terminated when the charging current drops below 1/10 programmed current after the float voltage is reached. When the charging current falls below 1/10 programmed charging current for longer than T TERM (1.8ms), charging is terminated. The 2056 enters in standby mode. NO V CC > V UVLO & VCE = HIGH & V CC > V BAT YES YES V BAT < 4.2V V BAT > 2.9V NO YES CC mode Charge Current=I BAT CHRG=Strong pull-down STDBY=High Impedance Shutdown mode PFET OFF CHRG=High Impedance STDBY=HIGH Impedance NO Trickle Charge mode Charge Current = 0.1 * I BAT CHRG=Strong pull-down STDBY=High Impedance I Charge < 0.1 * I BAT YES NO If V CC < V UVLO or VCC < VBAT or V CE = Low or V TEMP > 0.8V CC or V TEMP < 0.45V CC Standy mode Charge Current=0 CHRG=High Impedance STDBY=Strong pull-down V BAT < 4.1V YES 10

11 2056 Setting Charge Current The charging current can be programmed by a resistor connected from the PROG pin to ground. The battery charging current is 1200 times the PROG pin flowing out current. The value of required resistor can be calculated by the following equation: R = PROG I 1200 CHG( MAX ) The instantaneous charging current provided to the battery can be determined by monitoring the PROG pin voltage with the following equation: I CHG 1200 = R PROG 11

12 2056 Charge status indicator 2056 has two status indicators CHRG and STDBY. When the charger is operating in charging status, the CHRG and STDBY outputs enter strong pull-down and high impedance status, respectively. If the battery is in full status, the CHRG and STDBY outputs enter high impedance and strong pull-down, respectively. When the TEMP pin voltage is greater than V TEMP-H or lower than V TEMP-L, the CHRG and STDBY outputs enter high impedance. When the TEMP pin is short to ground for disable the temperature protection and the battery is not to connect BAT pin, the light of CHRG and STDBY are flicker and bright, respectively. Charger's Status Red Ied CHRG Green Ied STDBY Charging Iight dark Battery in full state dark light Under-voltage, battery's temperature is to high or too low, or not connect to battery(use TEMP) dark dark BAT pin is connected to 10uF capacitor, No battery mode (TEMP=GND) Green LED bright, Red LED flicker Thermal Protection The internal thermal feedback loop of 2056 reduces the charging current when the die temperature rises above approximately 145 o C. The function protects the 2056 from excessive temperature and allow user to push the limits of the power handing capability without risk of damaging

13 2056 Battery Temperature Fault Monitoring In the battery over-temperature condition, the charger will turn off the internal pass device. Two internal compared voltage references V TEMP-H and V TEMP-L are 80%*V CC and 45%*V CC, respectively. When the voltage at TEMP pin rises above V TEMP-H or falls below V TEMP-L, 2056 stops charging. After the system recover from a temperature fault, the charger will resume operation. If applications do not need the function, short the TEMP pin to ground. The resistance of R1 and R2 are set according to the battery temperature range and the value of thermal sensitive resistor. Assume the battery is equipped with NTC thermistor and the temperature range is T L to T H (T L <T H ). The thermistor resistance R T decreases as temperature increases from T L to T H. The TEMP pin voltage can be calculated as: R2 // R T V TEMP = R1 + R2 // RT V CC The V TEMP decreases as the temperature increase from T L to T H. R1 and R2 resistance are set for temperature: 0.8 R2 // R TL V CC = VTEMP = H R1 + R2 // RTL V CC at T L 0.45 R2 // R TH V CC = VTEMP L = R1 + R2 // RTH at T H Where R TL and R TH are the thermistor resistances at T L and T H, respectively. The R1 and R2 can be derived as following: R = 1 RTL RTH ( ) ( R R ) TL TH V CC R 2 = R TL RTL RTH ( ) ( ) R ( ) TH 13

14 2056 Under Voltage Lockout (UVLO) The 2056 incorporates an under voltage lockout circuit to keep the device disabled when V CC is below the UVLO rising threshold voltage. Once the UVLO rising threshold voltage is reached, the device start-up begins. The device operates until V CC falls below the UVLO falling threshold voltage. The typical hysteresis in the UVLO comparator is 200mV. Manual Shutdown The 2056 can be shutdown by removing RPROG or pull the CE pin to the low-level voltage. A new charge cycle is restarted by reconnecting the program resistor or pulling the CE pin to high-level voltage. Automatic Recharge After the charge cycle is terminated, the 2056 monitors the BAT pin voltage by a comparator with a 1.8ms filter time (T RECHARGE ). When the BAT pin voltage drops below 4.1V, a charge cycle restarts. The function can keep the battery near a fully charged condition. Stability Considerations In constant-current mode, the feedback loop includes the PROG pin. Because of the additional pole created by the PROG pin capacitor and resistor. The equivalent capacitance on this pin must be kept to minimum for the maximum allowed program resistor. The pole frequency created by the PROG pin should be kept above 100kHz. When the PROG pin is loaded with a capacitor, CPROG, the following equation can be used to calculate the maximum resistance. R 1 2 π 10 C PROG 5 PROG Generally, the average battery current may be of interest to the user rather than instantaneous current. A simple RC filter can be used on the PROG pin to measure the average battery current as shown in Figure 1. A 10K resistor has been added between the PROG pin and the filter capacitor to ensure stability GND PROG 10K R PROG CHARGE CURRENT MONITOR CIRCUITRY C FILTER Figure 1 14

15 2056 Power Dissipation 2056 has thermal feedback protection to reduce the charging current in overload condition, so the power dissipation is required to consider. The power dissipation definition is: P = ( V V ) I D CC BAT BAT Where P D is power dissipated, V CC is the input supply current, V BAT is the battery voltage and I BAT is the charge current will automatically reduce the charging current to maintain the die temperature under 145 o C approximately, so it is not necessary to check maximum power dissipation. The ambient temperature of thermal feedback protection is: T A ( VCC VBA ) θ JA o o = 145 C PD θ JA = 145 C For example: 2056 operating from a 5V power providing 0.8A to a 3.75V Li-Ion battery. The maximum ambient temperature which the 2056 operates in 0.8A condition can be calculated: o o TA = 145 C (5V 3.75V ) 0.8A 84 C / W = 57 o The 2056 can be used above 57 o C, but the charging current will be reduced below 0.8A. The charging current can be calculated: o 145 C TA I BAT = ( V V ) θ CC BAT JA According to the previous example with ambient temperature of 90 o C, the charging current is reduced to: C I o o 145 C 90 C = = 84 ( ) BAT 524 Layout Consideratons The good thermal conduction PCB layout is very important to apply to maximize the available charging current. The thermal path is from the die to the PCB. The PCB is the heat sink. The copper pads footprint should be as large as possible and expand out to large copper areas to spread and dissipate the heat to the ambient. Other heat source must be considered when designing a PCB layout because they will affect overall temperature rise and maximum charging current. V CC Bypass Capacitor ma Many types of capacitors can be used as input bypass capacitor. However, the high voltage transients can be generated under some start-up conditions when using the self-resonant and high Q characteristics of ceramic capacitors. Adding a 0.4Ω resistor in series with an X5R ceramic capacitors will minimize start-up voltage transients. 15

16 2056 n Characterization Curve PROG Pin Voltage vs. Supply Voltage (Constant Current Mode) 4.24 Battery Regulation (Float) Voltage vs. Supply Voltage V PROG (V) V Float (V) Supply Voltage (V) Supply Voltage (V) Charge Current vs. Supply Voltage Trickle Charge Current vs. Supply Voltage K 2.4K 10K K 2.4K 10K I BAT (A) I BAT (ma) Supply Voltage (V) Supply Voltage (V) Battery Regulation (Float) Charge Current 1 Charge Current vs. Battery Voltage (3.7V Li-Ior Battery) V Float (V) I BAT (A) I BAT (ma) V BAT (V) 4.2

17 2056 n Characterization Curve (Contd.) Charge Current vs. Battery Voltage Trickle Charge Current vs. Temperature o C 25 o C 50 o C I BAT (ma) I BAT (ma) V BAT (V) Temperature ( o C) Trickle Charge Threshold vs. Temperature Battery Regulation (Float) Voltage vs. Temperature V TRICKLE (V) V FLOAT (V) Temperature ( o C) Temperature ( o C) PROG Pin Voltage vs. Temperature Charge Current vs. Temperature K 2.4K 10K V PROG (V) I BAT (ma) Temperature ( o C) Temperature ( o C) 17

18 2056 n Tape and Reel Dimension SOP-8/PP P0 PIN 1 W P Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Pitch (P0) Part Per Full Reel Reel Size SOP-8/PP 12.0±0.1 mm 8.0±0.1 mm 4.0±0.1 mm 2500pcs 330±1 mm MSOP-8 P0 PIN 1 W P Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Pitch (P0) Part Per Full Reel Reel Size MSOP ±0.1 mm 8.0±0.1 mm 4.0±0.1 mm 4000pcs 330±1 mm 18

19 2056 n Tape and Reel Dimension (Contd.) DFN-8D (2mmx2mmx0.75mm) P0 PIN 1 W P Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Pitch (P0) Part Per Full Reel Reel Size DFN-8D (2x2x0.75mm) 8.0±0.1 mm 4.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm SOT-25 P0 W PIN 1 P Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Pitch (P0) Part Per Full Reel Reel Size SOT ±0.1 mm 4.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm 19

20 2056 n Tape and Reel Dimension (Contd.) TSOT-25A P0 W PIN 1 P Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Pitch (P0) Part Per Full Reel Reel Size TSOT-25A 8.0±0.1 mm 4.0±0.1 mm 4.0±0.1 mm 3000pcs 180±1 mm 20

21 2056 n Package Dimension SOP-8/PP TOP VIEW D1 SIDE VIEW SYMBOLS MILLIMETERS INCHES MIN MAX MIN MAX A E2 E E1 L1 A A C PIN 1 C E E D L b b e A2 A D e BSC BSC FRONT VIEW A1 θ 0 o 8 o 0 o 8 o E D

22 2056 n Package Dimension (Contd.) MSOP-8 Top View D e1 End View DETAIL A TOP PKG. E1 E B B E1 BTM PKG. L2 L L1 PIN 1 See Detail A SECTION B b b1 Front View. c c1 A A2 WITH PLATING A1 e b 22

23 2056 n Package Dimension (Contd.) DFN-8D (2mmx2mmx0.75mm) TOP VIEW BOTTOM VIEW D N5 e N8 L K E E1 D1 PIN 1 IDENTIFICATION N4 b N1 A REAR VIEW A1 A3 SYMBOLS MILLIMETERS INCHES MIN MAX MIN MAX A A A REF REF D E D E K MIN MIN b e TYP TYP L

24 2056 n Package Dimension (Contd.) SOT-25 Top View D Side View H E PIN1 S1 e L Front View A b A1 Lead Pattern Drawing 0.70 BSC 1.00 BSC 2.40 BSC Note: 1. Lead pattern unit description: BSC: Basic. Represents theoretical exact dimension or dimension target. 2. Dimensions in Millimeters. 3. General tolerance +0.05mm unless otherwise specified BSC 0.95 BSC 1.90 BSC 24

25 2056 n Package Dimension (Contd.) TSOT-25A D b L SYMBOLS MILLIMETERS INCHES MIN MAX MIN MAX 0.25 A E1 E A A PIN 1 e e1 TOP VIEW A1 c SIDE VIEW b c D E E REAR VIEW A2 A e e BSC BSC 1.90 BSC BSC L θ 0 o 8 o 0 o 8 o Lead Pattern Drawing 0.70 BSC 1.00 BSC 2.40 BSC Note: 1. Lead pattern unit description: BSC: Basic. Represents theoretical exact dimension or dimension target. 2. Dimensions in Millimeters. 3. General tolerance +0.05mm unless otherwise specified BSC 0.95 BSC 1.90 BSC 25

26 Life Support Policy: These products of, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of, Inc., Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information., Inc., August 2014 Document: A022A-DS2056-B.01 Corporate Headquarter, Inc. 8F, 12 WenHu St., Nei-Hu Taipei 114, Taiwan. Tel: Fax:

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