KB4054

KB4054 KINGBOR | Alldatasheet

Document overview

• Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
• PDF pages: 15

Technical content

Programmable Charge Current Up to 600mA No MOSFET, Sense Resistor or Blocking Diode Required Complete Linear Charger in SOT Package for Single Cell Lithium-Ion Batteries Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating Charges Single Cell Li-Ion Batteries Directly from USB Port Preset 4.2V Charge Voltage with ±1% Accuracy Charge Current Monitor Output for Gas Gauging Automatic Recharge Charge Status Output Pin C/10 Charge Termination 25µA Supply Current in Shutdown 2.9V Trickle Charge Threshold (KB4054) Available Without Trickle Charge (KB4054X) Soft-Start Limits Inrush Current Available in SOT23-5 Package Cellular Telephones, PDAs, MP3 Players Charging Docks and Cradles Bluetooth Applications The KB 4054 is a complete constant-current/constant- voltage linear charger for single cell lithium-ion batteries. Its ThinSOT package and low external component count make the KB4054 ideally suited for portable applications. Furthermore, the KB4054 is specifically designed to work within USB power specifications. No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture. Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature. The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with a single resistor. The KB4054 automatically terminates the charge cycle when the charge current drops to 1/10th the programmed value after the final float voltage is reached. When the input supply (wall adapter or USB supply) is removed, the KB4054 automatically enters a low current state, dropping the battery drain current to less than 2µA. The KB4054 can be put into shutdown mode, reducing the supply current to 25µA. Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage. 450mA Single Cell Li-Ion Charger V CC 2.2k 4.2V Li-Ion BATTERY KB4054-4.2 1µF V IN 4.5V TO 5.5V BAT PROG GND 450mA FEATURES DESCRIPTION KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 Li-Ion Battery Charger TYPICAL APPLICATION

(Note 1) Input Supply Voltage (V CC CC + 0.3V Operating Ambient Temperature Range T JMAX = 125°C, (θ JA = 80°C/ W TO 150°C/W DEPENDING ON PC BOARD LAYOUT) (N0TE 3) ORDER PART NUMBER S5 PART MARKING 6102 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V CC Input Supply Voltage 4.25 6.5 V I CC Input Supply Current Charge Mode (Note 4), R PROG = 10k 300 2000 µA Standby Mode (Charge Terminated) 200 500 µA Shutdown Mode (R PROG Not Connected, 25 50 µA V CC < V BAT , or V CC < V UV V FLOAT Regulated Output (Float) Voltage 0 °C ≤ T A ≤ 85°C, I BAT = 40mA 4.158 4.2 4.242 V I BAT BAT Pin Current R PROG = 10k, Current Mode 93 100 107 mA R PROG = 2k, Current Mode 465 500 535 mA Standby Mode, V BAT = 4.2V 0 –2.5 –6 µA Shutdown Mode (R PROG Not Connected) ±1 ±2 µA Sleep Mode, V CC = 0V ±1 ±2 µA I TRIKL Trickle Charge Current V BAT < V TRIKL , R PROG = 2k (Note 5) 20 45 70 mA V TRIKL Trickle Charge Threshold Voltage R PROG = 10k, V BAT Rising (Note 5) 2.8 2.9 3.0 V V TRHYS Trickle Charge Hysteresis Voltage R PROG = 10k (Note 5) 60 80 110 mV V UV V CC Undervoltage Lockout Threshold From V CC Low to High 3.7 3.8 3.92 V V UVHYS V CC Undervoltage Lockout Hysteresis 150 200 300 mV V MSD Manual Shutdown Threshold Voltage PROG Pin Rising 1.15 1.21 1.30 V PROG Pin Falling 0.9 1.0 1.1 V V ASD V CC – V BAT Lockout Threshold Voltage V CC from Low to High 70 100 140 mV V CC from High to Low 5 30 50 mV I TERM C/10 Termination Current Threshold R PROG = 10k (Note 6) 0.085 0.10 0.115 mA/mA R PROG = 2k 0.085 0.10 0.115 mA/mA V PROG PROG Pin Voltage R PROG = 10k, Current Mode 0.93 1.0 1.07 V I CHRG CHRG Pin Weak Pull-Down Current V CHRG = 5V 8 20 35 µA V CHRG CHRG Pin Output Low Voltage I CHRG = 5mA 0.35 0.6 V RECHRG Recharge Battery Threshold Voltage V FLOAT - V RECHRG 100 150 200 mV The denotes specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25°C. V CC = 5V, unless otherwise noted. CHRG 1 GND 2 TOP VIEW S5 PACKAGE PLASTIC SOT23-5 BAT 3

5 PROG

KB4054ES5-4.2 KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 ABSOLUTE MAXIMUM RATINGS PACkAGE/ORDER INFORMATION

ELECTRICAL CHARACTERISTICS

Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired. Note 2: The KB4054E-4.2 and the KB4054XE-4.2 are guaranteed to meet performance specifications 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. Note 3: See Thermal Considerations. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS T LIM Junction Temperature in Constant 120 °C Temperature Mode R ON Power FET “ON” Resistance 600 m Ω (Between V CC and BAT) t SS Soft-Start Time I BAT = 0 to I BAT =1000V/R PROG 100 µs t RECHARGE Recharge Comparator Filter Time V BAT High to Low 0.75 2 4.5 ms t TERM Termination Comparator Filter Time I BAT Falling Below I CHG /10 400 1000 2500 µs I PROG PROG Pin Pull-Up Current 3 µA The denotes specifications which apply over the full operating temperature range, otherwise specifications are at T A = 25°C. V CC = 5V, unless otherwise noted. Note 4: Supply current includes PROG pin current (approximately 100µA) but does not include any current delivered to the battery through the BAT pin (approximately 100mA). Note 5: This parameter is not applicable to the KB4054X. Note 6: I TERM is expressed as a fraction of measured full charge current with indicated PROG resistor. PROG Pin Voltage vs Supply Voltage(Constant Current Mode) PROG Pin Voltage vs Temperature Charge Current vs PROG Pin Voltage V PROG (V) V CC (V) 4.0 V PROG (V) 1.015 1.010 1.005 1.000 0.995 0.990 0.985 4.5 5.0 5.5 6.0 6.5 7.0 TEMPERATURE (°C) –50 –25 0 50 25 75 100 1.0100 1.0075 1.0050 1.0025 1.0000 0.9975 0.9950 0.9925 0.9900 V PROG (V) I BAT (mA) 600 500 400 300 200 100 0.25 0.50 0.75 1.00 1.25 V CC = 5V V BAT = 4V T A = 25°C R PROG = 10k V CC = 5V V BAT = 4V R PROG = 10k V CC = 5V T A = 25°C R PROG = 2k KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (°C) –50 I PROG (µA) 3.7 3.5 3.3 3.1 2.9 2.7 2.5 25 75–25 0 50 100 125 V PROG (V) I PROG (µA) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 V PROG (V) 2.0 I PROG (µA) 5.03.0 4.0 –50 –100 –150 –200 –250 –300 –350 –400 2.5 3.5 4.5 5.5 TEMPERATURE (°C) –50 V FLOAT (V) V FLOAT (V) V FLOAT (V) 10005 0 4.26 4.24 4.22 4.20 4.18 4.16 4.14 4.12 4.10 –25 25 75 4.215 4.210 4.205 4.200 4.195 4.190 4.185 I BAT (mA) 0 100 200 300 400 500 700 600 V CC (V) 4.0 4.215 4.210 4.205 4.200 4.195 4.190 4.185 4.5 5.0 5.5 6.0 6.5 7.0 TEMPERATURE (°C) –50 I CHRG (mA) 10005 0 –25 25 75 125 0 3512 46 7 V CHRG (V) I CHRG (mA) 2 4 51 3 6 7 V BAT = 4.3V V PROG = 0V V CC = 5V V BAT = 4.3V T A = 25°C V CC = 5V V BAT = 4.3V T A = 25°C V CC = 6.5V V CC = 4.2V V CC = 5V T A = 25°C R PROG = 1.25k V CC = 5V R PROG = 10k T A = 25°C R PROG = 10k V CC = 5V V BAT = 4V T A = 25°C V CC = 5V V BAT = 4.3V T A = 25°C V CC = 5V V BAT = 4V V CHRG = 1V V CHRG (V) I CHRG (µA) PROG Pin Pull-Up Current vs Temperature and Supply Voltage PROG Pin Current vs PROG Pin Voltage (Pull-Up Current) PROG Pin Current vs PROG Pin Voltage (Clamp Current) Regulated Output (Float) Voltage vs Charge Current Regulated Output (Float) Voltage vs Temperature Regulated Output (Float) Voltage vs Supply Voltage CHRG Pin I-V Curve (Strong Pull-Down State) CHRG Pin Current vs Temperature (Strong Pull-Down State) CHRG Pin I-V Curve (Weak Pull-Down State) KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 TYPICAL PERFORMANCE CHARACTERISTICS

TEMPERATURE (°C) –50 –25 0 25 50 75 100 TEMPERATURE (°C) –50 I CHRG (µA) –25 02 5 5 0 75 100 TEMPERATURE (°C) –50 –25 0 25 50 75 100 I TRIKL (mA) I TRIKL (mA) V CC (V) 4.0 4.5 5.0 5.5 6.0 6.5 7.0 V TRIKL (V) 3.000 2.975 2.950 2.925 2.900 2.875 2.850 2.825 2.800 V BAT (V) 2.7 3.0 I BAT (mA) I BAT (mA) 600 500 400 300 200 100 I BAT (mA) 600 500 400 300 200 100 V CC (V) 4.0 600 500 400 300 200 100 4.5 5.0 5.5 6.0 6.5 7.0 V RECHRG (V) 4.11 4.09 4.07 4.05 4.03 4.01 3.99 TEMPERATURE (°C) –50 25 75–25 0 50 100 125 TEMPERATURE (°C) –50 25 75–25 0 50 100 –50 25 75–25 0 50 100 125 TEMPERATURE (°C) R DS(ON) (mΩ) 700 650 600 550 500 450 400 350 V CC = 5V V BAT = 4.3V V CHRG = 5V V CC = 5V V BAT = 2.5V V BAT = 2.5V T A = 25°C V BAT = 4V T A = 25°C θ JA = 80°C/W ONSET OF THERMAL REGULATION V CC = 5V θ JA = 125°C/W R PROG = 2k V CC = 5V R PROG = 10k V CC = 5V V BAT = 4V θ JA = 80°C/W V CC = 5V R PROG = 10k V CC = 4.2V I BAT = 100mA R PROG = 2k R PROG = 2k R PROG = 10k R PROG = 10k R PROG = 2k R PROG = 10k R PROG = 2k R PROG = 10k R PROG = 2k T A = 40°C T A = 25°C T A = 0°C ONSET OF THERMAL REGULATION CHRG Pin Current vs Temperature (Weak Pull-Down State) Trickle Charge Current vs Temperature Trickle Charge Current vs Supply Voltage Trickle Charge Threshold vs Temperature Charge Current vs Battery Voltage Charge Current vs Supply Voltage Charge Current vs Ambient Temperature Recharge Voltage Threshold vs Temperature Power FET “ON” Resistance vs Temperature KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 TYPICAL PERFORMANCE CHARACTERISTICS

CHRG (Pin 1): Open-Drain Charge Status Output. When the battery is charging, the CHRG pin is pulled low by an internal N-channel MOSFET. When the charge cycle is completed, a weak pull-down of approximately 20 µA is connected to the CHRG pin, indicating an “AC present” condition. When the KB4054 detects an undervoltage lockout condition, CHRG is forced high impedance. GND (Pin 2): Ground. BAT (Pin 3): Charge Current Output. Provides charge current to the battery and regulates the final float voltage to 4.2V. An internal precision resistor divider from this pin sets the float voltage which is disconnected in shutdown mode. V CC (Pin 4): Positive Input Supply Voltage. Provides power to the charger. V CC can range from 4.25V to 6.5V and should be bypassed with at least a 1 µF capacitor. When V CC drops to within 30mV of the BAT pin voltage, the KB4054 enters shutdown mode, dropping I BAT to less than 2µA. PROG (Pin 5): Charge Current Program, Charge Current Monitor and Shutdown Pin. The charge current is pro- grammed by connecting a 1% resistor, R PROG , to ground. When charging in constant-current mode, this pin servos to 1V. In all modes, the voltage on this pin can be used to measure the charge current using the following formula: I BAT = (V PROG PROG ) • 1000 The PROG pin can also be used to shut down the charger. Disconnecting the program resistor from ground allows a 3µA current to pull the PROG pin high. When it reaches the 1.21V shutdown threshold voltage, the charger enters shutdown mode, charging stops and the input supply current drops to 25 µA. This pin is also clamped to approximately 2.4V. Driving this pin to voltages beyond the clamp voltage will draw currents as high as 1.5mA. Reconnecting R PROG to ground will return the charger to normal operation. KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 PIN FUNCTIONS

– + – + 120°C T DIE T A MA CA 1000× VA BAT 0.1V PROG 3µA 5µA V CC R PROG REF 1.21V SHDN V CC STANDBY CHRG GND 2.9V TO BAT TRICKLE CHARGE DISABLED ON KB4054X KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 SIMPLIFIED BLOC DIAGRAM

The KB4054 is a single cell lithium-ion battery charger using a constant-current/constant-voltage algorithm. It can deliver up to 800mA of charge current (using a good thermal PCB layout) with a final float voltage accuracy of ±1%. The KB4054 includes an internal P-channel power MOSFET and thermal regulation circuitry. No blocking diode or external current sense resistor is required; thus, the basic charger circuit requires only two external com- ponents. Furthermore, the KB4054 is capable of operat- ing from a USB power source. Normal Charge Cycle A charge cycle begins when the voltage at the V CC pin rises above the UVLO threshold level and a 1% program resistor is connected from the PROG pin to ground or when a battery is connected to the charger output. If the BAT pin is less than 2.9V, the charger enters trickle charge mode. In this mode, the KB4054 supplies approximately 1/10 the programmed charge current to bring the battery volt- age up to a safe level for full current charging. (Note: The KB4054X does not include this trickle charge feature). When the BAT pin voltage rises above 2.9V, the charger enters constant-current mode, where the programmed charge current is supplied to the battery. When the BAT pin approaches the final float voltage (4.2V), the KB4054 enters constant-voltage mode and the charge current begins to decrease. When the charge current drops to 1/10 of the programmed value, the charge cycle ends. Programming Charge Current The charge current is programmed using a single resistor from the PROG pin to ground. The battery charge current is 1000 times the current out of the PROG pin. The program resistor and the charge current are calculated using the following equations: R V I I V R PROG CHG CHG PROG ==1000 1000, The charge current out of the BAT pin can be determined at any time by monitoring the PROG pin voltage using the following equation: I V R BAT PROG PROG = 1000 Charge Termination A charge cycle is terminated when the charge current falls to 1/10th the programmed value after the final float voltage is reached. This condition is detected by using an internal, filtered comparator to monitor the PROG pin. When the PROG pin voltage falls below 100mV for longer than t TERM (typically 1ms), charging is terminated. The charge current is latched off and the KB4054 enters standby mode, where the input supply current drops to 200 µA. (Note: C/10 termination is disabled in trickle charging and thermal limiting modes). When charging, transient loads on the BAT pin can cause the PROG pin to fall below 100mV for short periods of time before the DC charge current has dropped to 1/10th the programmed value. The 1ms filter time (t TERM ) on the termination comparator ensures that transient loads of this nature do not result in premature charge cycle termi- nation. Once the average charge current drops below 1/10th the programmed value, the KB4054 terminates the charge cycle and ceases to provide any current through the BAT pin. In this state, all loads on the BAT pin must be supplied by the battery. The KB4054 constantly monitors the BAT pin voltage in standby mode. If this voltage drops below the 4.05V recharge threshold (V RECHRG ), another charge cycle be- gins and current is once again supplied to the battery. To manually restart a charge cycle when in standby mode, the input voltage must be removed and reapplied, or the charger must be shut down and restarted using the PROG pin. Figure 1 shows the state diagram of a typical charge cycle. Charge Status Indicator (CHRG) The charge status output has three different states: strong pull-down (~10mA), weak pull-down (~20 µA) and high impedance. The strong pull-down state indicates that the KB4054 is in a charge cycle. Once the charge cycle has terminated, the pin state is determined by undervoltage Note 1: Any external sources that hold the PROG pin above 100mV will prevent the KB4054 from terminating a charge cycle. KB4054 Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 OPERATION (V =1V) PROG

down state during recharge cycles. cussed in the Applications Information section. Figure 1. State Diagram of a Typical Charge Cycle

mended to add a 1Ω resistor in series with the capacitor.

• θ JA Example: An KB4054 operating from a 5V USB supply is programmed to supply 400mA full-scale current to a discharged Li-Ion battery with a voltage of 3.75V. Assum- ing θ JA is 150°C/W (see Board Layout Considerations), the ambient temperature at which the KB4054 will begin to reduce the charge current is approximately: T A T A T A = 45°C PROG 10k R PROG C FILTER CHARGE CURRENT MONITOR CIRCUITRYKB4054 GND

Figure 2. Isolating Capacitive Load on PROG Pin and Filtering

**Table 1. Measured Thermal Resistance (2-Layer Board*)** Table 2. Measured Thermal Resistance (4-Layer Board)** can significantly decrease the power dissipation in the IC. nent, such as a resistor or diode. proportionally as discussed in the Operation section. overall temperature rise and the maximum charge current. *Top and bottom layers use two ounce copper, inner layers use one ounce copper.

Figure 7. Combining Wall Adapter and USB Power

1.50 – 1.75 (NOTE 4)

2.80 BSC

0.30 – 0.45 TYP

5 PLCS (NOTE 3)

DATUM ‘A’ 0.09 – 0.20 (NOTE 3) PIN ONE

2.90 BSC

(NOTE 4)

0.95 BSC

1.90 BSC

0.80 – 1.20

1.30 MAX

0.01 – 0.100.20 BSC 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193

3.85 MAX

0.62 MAX 0.95 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR

1.4 MIN

2.62 REF

1.22 REF

Kingbor Technology Co.,Ltd TEL:(86)0755-26508846 FAX:(86)0755-26509052 PACAGE DESCRIPTION