SD9057 SHOUDING | Alldatasheet
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The SD9057 is available in the SOP-8L package adjustable. The SD9057 is monitored by with a single resistor. SD9057 determines the external component count make the SD9057 The SD9057 is a complete constant-current/ FFeeaattuurreess /head2right Preset 8.4V Charge Voltage with 1% Accuracy /head2right Programmable Charge Current Up to 1A /head2right /head2right Pre-Charging, the Charge Current is adjustable /head2right Ideal for Dual-Cell（ 8.4V） Li-Ion Batteries /head2right Constant -Current Charging, the Charge Current is adjustable /head2right Constant-Voltage Charging /head2right Constant-Current/Constant-Voltage Charging with Temperature Monitoring /head2right Automatic Recharge /head2right Double LEDs Charge Status Indication /head2right Available in SOP-8L Package AA pppplliiccaattiioonnss /head2right Charger for Li-Ion Coin Cell Batteries /head2right Portable MP3 Players, Wireless Headsets DD eessccrriippttiioonn constant voltage linear charger for cell lithium-ion batteries. Its package and low ideally suited for portable applications. The charge current can be programmed externally charge mode by detecting the battery voltage: Pre-charge, constant current charging, constant voltage charging. The charge current of pre-charging and constant –current charging is temperature monitor during the constant-current and constant-voltage charging. There are two LEDs indicate the charge mode. (or upon request). /head2right Multifunction Wristwatches /head2right Bluetooth Applications Input Voltage:9-10V DC SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net
TTyyppiiccaall AA pppplliiccaattiioonn Figure 1: Typical Application Circuit with Two LEDs ＊＊ The charge current IO(REG) =VCS /RSET (VCS is usually 200mV). Note that OFF indicates the open-drain transistor is turned off. ＊＊ The reverse-blocking protection diode is optional. In addition, the reverse-leakage current of the diode should be kept as small as possible. Condition LED1 LED2 Battery charging ON OFF Charge complete OFF ON SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net
PP iinn AA ssssiiggnnmm eenntt SOP-8L TTyyppiiccaall CC hhaarrggee PP rrooffiillee PIN NUMBER SOP-8L PIN NAME DESCRIPTION
1 CHRG1
2 TS Temperature Sense
3 GND Ground
4 VOUT Charge Current Output
5 PDRI
Charge Current Monitor and Shutdown Pin
6 CS Charge Current Program
7 CHRG2
8 VIN Positive Input Supply Voltage. SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net
The SD9057 is guaranteed to meet performance specif AA bbssoolluuttee MM aaxxiimm uumm RR aattiinnggss ((NN oottee 11)) Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: ications from 0°C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net
EE lleeccttrriiccaall CC hhaarraacctteerriissttiiccss Operating Conditions: TA=25℃ . SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Input Supply Voltage IIN Input Supply Current Standby Mode (Charge Terminated) l 0.25 mA ISLEEP Sleep Current Sum of currents into VOUT pin, VIN=0 25 µ A Battery Voltage Regulation Constant-current Charge VO(REG) Output voltage 8.317 8.4 8.484 V V（ CS ） Current regulation threshold Voltage at pin CS , relative to VIN 180 200 220 mV Trickle Charge VTRIKL Trickle Charge Threshold Voltage VBAT < VTRIKL, RSET =0.33Ω . 5.6 6 6.2 V ITRIKL Trickle Charge Current VBAT Rising, RSET =0.33Ω . 60 mA VRCH comparator（（ （（ Battery Recharge Threshold）） ）） V（ RCH ） Recharge Battery Threshold Voltage VFLOAT - VRECHRG VO(REG) -400m V V Temperature Sense Comparator VTS-COLD TS Pin Threshold Voltage（ Cold） VTS from Low to High 2.486 V VTS- HOT TS Pin Threshold Voltage（ Hot） VTS from High to Low 0.485 V ITS TS Pin Output Current 85 uA 9 9.5 10 V SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net
PP iinn DD eessccrriippttiioonn CHRG1 (Pin 1): Charge Status Indication. When the battery is charging, the CHRG pin is pulled low. When the charge cycle is completed, the CHRG pin is pulled high. This PIN is available through a 2kohm resistor and indicates that the light-emitting diode connected. TS (Pin 2): Temperature Sense. GND (Pin 3): Ground. VOUT (Pin 4): Charge Current Output. It should be bypassed with at least a 10uF capacitor. It provides charge current to the battery and regulates the final float voltage to 8.4V. PDRI (Pin 5): Driving side. Connect to the grid of the PMOS. CS (Pin 6): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is programmed by connecting a resistor, RSET, ISET = V（ CS ） /RSET . CHRG2 (Pin 7): End-of-Charge Status Indication. When the battery is charging, the CHRG2 pin is forced high. When the charge cycle is completed, CHRG2 is pulled low. VIN (Pin 8): Positive Input Supply Voltage. It Provides power to the charger VIN and should be bypassed with a 10uF capacitor. www.shouding.net
The SD9057 is a high accuracy linear Li-Lon Battery Ch AA pppplliiccaattiioonn IInnffoorrmm aattiioonn Functional Description arger for dual-cell Li-Ion applications. Refer to Operation Flow Chart (Figure 1) in this section. Figure 2: Operation Flow Chart www.shouding.net
of the battery pack. The SD9057 monitors the battery The SD9057 monitors charge current at the CS input by t The SD9057 regulates current while the battery-pack vol , the SD9057 uses precharge to lowed range. The SD9057 also checks the battery The SD9057 suspends charge if the battery temperature i When power is applied, the SD9057 starts a charge-cycle i Qualification and Precharge f a battery is already present or when a battery is inserted. Charge qualification is based on battery temperature and voltage. s outside the VTS1 to VTS2 range and suspends charge until the battery temperature is within the al voltage. If the battery voltage is below the precharge threshold V(min) condition the battery. The conditioning charge rate I(PRECHG) is set at approximately 10% of the regulation current. The conditioning current also minimizes heat dissipation in the external pass-element during the initial stage of charge. See Figure 3 for a typical charge-profile. Figure 3: Typical Charge Profile Current Regulation Phase tage is less than the regulation voltage, VO(REG) . he voltage drop across a sense-resistor, RSET , in series with the battery pack. In current sensing configuration, RSET is between the VIN and CS pins, charge-current feedback, applied through pin CS, maintains a voltage of VCS across the current sense resistor. The following formula calculates the value of the Sense resistor: Where IREG is the desired charging current. Voltage Phase The voltage regulation feedback is through the VOUT pin. This input is tied directly to the positive side -pack voltage between the VOUT and GND pins. SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net
ng capacitor. The SD9057 works with both The SD9057 does not require any output capacitor for oltage-regulation phase. The SD9057 declares a The SD9057 monitors the charging current during the v The SD9057 is offered 8.4V output voltage. Charge Termination Recharge done condition and terminates charge when the current drops to the charge termination threshold, ITERM. A new charge cycle begins when the battery voltage falls below the VRCH threshold. Battery Temperature Monitoring A negative temperature coefficient (NTC) thermistor located close to the battery pack can be used to monitor battery temperature and will not allow charging unless the battery temperature is within an acceptable range. Connect a 10kΩ thermistor from the TS pin to ground. With the 85µA pull-up current source, the hot temperature voltage threshold is 485mV. For cold temperature, the voltage threshold is set at 2.486V with 85µA of pull-up current. The charge cycle begins or resumes once the temperature is within the acceptable range. Reverse Blocking Protection The optional reverse-blocking protection diode, depicted in Figure1 provides protection from a faulted or shorted input, or from a reversed-polarity input source. Without the protection diode, a faulted of shorted input would discharge the battery pack through the body diode of the external pass transistor. If a reverse-protection diode is incorporated in the design, it should be chosen to handle the fast charge current continuously at the maximum ambient temperature. In addition, the reverse-leakage current of the diode should be kept as small as possible. Selecting Input Capacitor In most applications, all that is high-frequency decoupli regulated an unregulated external dc supplies. If a non-regulated supply is chosen, the supply voltage to the minimum required input voltage at maximum load. If not, more capacitance must be added to the input of the charger. Selecting Output Capacitor loop stability. In order to maintain good AC stability in constant Voltage mode, a minimum capacitance of 10uF is recommenced to bypass the BAT pin to GND. This capacitance provides compensation when there is no battery load. In addition, the battery and interconnections appear inductive at high frequencies. These elements are in the control feedback loop during Constant Voltage mode. Therefore, the bypass capacitance may be necessary to compensate for the inductive nature of the battery pack. Virtually any good quality output filter capacitor can be used, independent of the capacitor’s minimum ESR (Effective Series Resistance) value. The actual value of the capacitor and its associated ESR depends on the forward transconductance (gm) and capacitance of the external pass transistor. A 10uF tantalum or aluminum electrolytic capacitor at the output is usually sufficient to ensure stability for up to a 1A output current. SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net
PP aacckkaaggiinngg IInnffoorrmm aattiioonn Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 1.350 1.750 0.053 0.069 A1 0.100 0.250 0.004 0.010 A2 1.350 1.550 0.053 0.061 b 0.330 0.510 0.013 0.020 c 0.170 0.250 0.006 0.010 D 4.700 5.100 0.185 0.200 E 3.800 4.000 0.150 0.157 E1 5.800 6.200 0.228 0.244 e 1.270(BSC) 0.050(BSC) L 0.400 1.270 0.016 0.050 θ 0° 8° 0° 8° SD9057 Linear Li-Lon Battery Charger High Accuracy Shouding www.shouding.net