Datasheet

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LTC4063

4063fc

Typical applicaTion

FeaTures DescripTion

Standalone Linear Li-Ion

Charger with Micropower

Low Dropout Linear Regulator

The LTC

4063 is a standalone linear charger for single cell

lithium-ion batteries with an adjustable low dropout linear

regulator (LDO). The adjustable LDO regulates an output

voltage between 1.2V to 4.2V at up to 100mA load cur-

rent. When the input supply (wall adapter or USB supply)

is removed, the LDO regulates the output voltage without

interruption. The battery charger and LDO regulator can

be enabled individually.

No external sense resistor or external blocking diode is

required for charging due to the internal MOSFET archi-

tecture. Internal thermal feedback regulates the charge

current to maintain a constant die temperature during high

power operation or high ambient temperature conditions.

The float voltage is fixed at 4.2V and the charge current is

programmed with an external resistor. Charge termination

methods include minimum charge current or maximum

time. With power applied, the LTC4063 can be put into

shutdown mode to reduce the supply current to 35µA and

the battery drain current to less than 2µA.

Other features include smart recharge, undervoltage

lockout, LDO current limiting and a charge status pin to

indicate when the charge cycle has completed.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

SmartStart, ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All

other trademarks are the property of their respective owners. Protected by U.S. Patents

including 6522118.

applicaTions

Charge Current Programmable up to 1A

Integrated 100mA Adjustable Low Dropout Linear

Regulator

Charges Single Cell Li-Ion Batteries Directly from

USB Port

Preset Charge Voltage with ±0.35% Accuracy

No External MOSFET, Sense Resistor or Blocking

Diode Needed

Thermal Regulation Maximizes Charge Rate

without Risk of Overheating

Adjustable LDO Output Voltage Range:

1.2V to 4.2V

Programmable Charge Termination Timer

Programmable Charge Current Detection/Termination

SmartStart™ Prolongs Battery Life

Charge Status Output

35µA Charger Quiescent Current in Shutdown

15µA LDO Quiescent Current

Available in a Low Profile (0.75mm) 10-Lead

(3mm × 3mm) DFN Package

Handheld Computers

Portable MP3 Players

Digital Cameras

Single Cell Li-Ion Battery Charger with Regulated 3V Output

(C/10 Termination)

Complete Charge Cycle (900mAh Battery)

TIMER

PROG

IDET

BAT

OUT

LTC4063

GND

440k

700mA

160k

715Ω

2.2µF

1µF

4.3V TO 8V

4063 TA01a

OUT

4.2V

SINGLE CELL

Li-Ion BATTERY

TIME (HOURS)

CHARGE CURRENT (mA)

BATTERY VOLTAGE (V)

400

500

600

4063 TA01b

300

200

0.50

1.50

0.25 2.25

0.75

1.25

1.75

100

800

700

3.75

4.00

4.25

3.50

3.25

2.75

3.00

4.75

4.50

CONSTANT CURRENT

CONSTANT

VOLTAGE

= 5V

= 25°C

Summary of content (20 pages)

PAGE 1
LTC4063 Standalone Linear Li-Ion Charger with Micropower Low Dropout Linear Regulator Features n n n n n n n n n n n n n n Description Charge Current Programmable up to 1A Integrated 100mA Adjustable Low Dropout Linear Regulator Charges Single Cell Li-Ion Batteries Directly from USB Port Preset Charge Voltage with ±0.35% Accuracy No External MOSFET, Sense Resistor or Blocking Diode Needed Thermal Regulation Maximizes Charge Rate without Risk of Overheating Adjustable LDO Output Voltage Range: 1.
PAGE 2
LTC4063 Absolute Maximum Ratings Pin Configuration (Note 1) Input Supply Voltage (VCC)......................... –0.3V to 10V CHGEN, LDOEN, CHRG............................... –0.3V to 10V FB ................................................................. –0.3V to 8V PROG, IDET, TIMER......................... –0.3V to VCC + 0.3V BAT, OUT....................................................... –0.3V to 8V BAT Short-Circuit Duration............................ Continuous OUT Short-Circuit Duration.........
PAGE 3
LTC4063 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 5V, unless otherwise noted. SYMBOL PARAMETER RCHGEN CHGEN Pin Pull-Down Resistor VCT Charge Termination Mode Threshold Voltage VUT CONDITIONS MIN TYP MAX 1.2 2 5 MΩ VTIMER from High to Low Hysteresis 0.4 0.7 100 1 V mV User Termination Mode Threshold Voltage VTIMER from Low to High Hysteresis 4.15 4.1 100 4.
PAGE 4
LTC4063 Typical Performance Characteristics Regulated Output (Float) Voltage vs Charge Current Regulated Output (Float) Voltage vs Temperature 4.215 VCC = 5V RPROG = 1.25k 4.24 1.006 RPROG = 10k 4.210 VFLOAT (V) 4.20 4.18 4.16 RPROG = 10k 1.004 4.22 VFLOAT (V) PROG Pin Voltage vs Temperature (Constant-Current Mode) 4.205 VCC = 8V 4.200 VCC = 4.3V 1.002 VPROG (V) 4.26 TA = 25°C, unless otherwise noted. VCC = 8V 1.000 4.195 0.998 4.190 0.996 VCC = 4.3V 4.14 4.12 4.10 4.
PAGE 5
LTC4063 Typical Performance Characteristics Charge Current vs Ambient Temperature 900 ONSET OF THERMAL REGULATION 800 400 ONSET OF THERMAL REGULATION 600 500 200 V = 5V CC VBAT = 4V QJA = 40°C/W 0 50 0 75 25 –50 –25 TEMPERATURE (°C) 300 125 4.5 4 5.5 5 70 VBAT = 4V IBAT = 200mA RPROG = 1.25k 60 6.5 7 7.5 8 4.04 –50 CHGEN = VCC LDOEN = 0V 450 30 VCC = 4.
PAGE 6
LTC4063 Typical Performance Characteristics LDO Regulator Dropout Voltage vs Temperature LDO Regulator Quiescent Current vs Temperature 25 VOUT = 3V IOUT = 100mA 20 VBAT = 4.2V IBAT (µA) VDROPOUT (mV) 150 100 50 15 VBAT = 2.65V 10 5 0 –50 –25 0 25 50 TEMPERATURE (°C) 75 0 –50 100 –25 50 0 25 TEMPERATURE (°C) 75 900 VOUT = 3V 120 TA = 90°C 90 60 0 TA = 25°C 0 20 40 60 80 LOAD CURRENT (mA) 120 100 10 1k 10k FREQUENCY (Hz) 100k 4063 G24 2.8 2.6 800 750 2.4 2.2 2.
PAGE 7
LTC4063 Pin Functions BAT (Pin 1): Charger Output and Regulator Input. This pin provides charge current to the battery and regulates the final float voltage to 4.2V. This pin also supplies power to the LDO regulator. OUT (Pin 2): LDO Regulator Output. This pin should be bypassed with a ≥2µF low ESR capacitor as close to the pin as possible for best performance. The minimum VOUT is 1.2V. FB (Pin 3): Regulator Feedback Input.
PAGE 8
LTC4063 Block Diagram 10 VCC – TO BAT 1000s + 4.1V 6 1s 1s C1 – CHRG STOP BAT + MA OUT 1 2 RECHRG 4 LDOEN 2MΩ 5 CHGEN CA LDOEN – LOGIC + – R1 + – 1.2V 0.1V VCC 2MΩ + RA FB 1V CHGEN TERM VA 800mV 3 R2 3µA SEL C2 + COUNTER C3 – 0.1V OSCILLATOR – + 2.
PAGE 9
LTC4063 Operation The LTC4063 is designed to charge a single cell lithiumion battery and supply a regulated output voltage for battery-powered applications. Using the constant current/ constant voltage algorithm, the charger can deliver up to 1A of charge current with a final float voltage accuracy of ±0.35%. The LTC4063 includes an internal P-channel power MOSFET and thermal regulation circuitry.
PAGE 10
LTC4063 Operation protects the LTC4063 from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the LTC4063. The charge current can be set according to typical (not worst-case) ambient temperatures with the assurance that the charger will automatically reduce the current in worst-case conditions.
PAGE 11
LTC4063 Operation BAT SINGLE CELL Li-Ion BATTERY + VOUT OUT R2 LTC4063 COUT FB GND R1 4063 F01 Figure 1. Adjustable Linear Regulator Figure 1 shows how an external resistor divider sets the regulator output voltage. The output voltage can be set anywhere between 1.2V and 4.2V, although the upper limit is limited by the battery voltage minus the regulator dropout voltage.
PAGE 12
LTC4063 Applications Information When the charge current (IBAT) is greater than IDETECT, the CHRG output is in its pull-down state. When the charger enters constant-voltage mode operation and the charge current falls below IDETECT, the CHRG output becomes high impedance, indicating that the battery is almost VIN VCC BAT fully charged. The CHRG output will also become high impedance once the charge time elapses.
PAGE 13
LTC4063 Applications Information Charge Current Termination comparator ensures that transient loads of this nature do not result in premature charge cycle termination. Once the average charge current drops below IDETECT, the charger terminates the charge cycle. Connecting the TIMER pin to ground selects Charge Current Termination. With this method, the timer is disabled and a resistor (RDET) must be connected from the IDET pin to ground.
PAGE 14
LTC4063 Applications Information POWER ON CHGEN = 0V OR UVLO CONDITION STOPS TRICKLE CHARGE MODE 1/10 FULL CURRENT BAT < 2.9V SHUTDOWN MODE CHRG STATE: PULL-DOWN ICC DROPS TO 35µA BAT > 2.9V CHRG STATE: Hi-Z CHARGE MODE FULL CURRENT CHRG STATE: 2.9V < BAT PULL-DOWN IF IBAT > IDETECT Hi-Z IF IBAT < IDETECT 4063 F05 CHGEN = 5V OR UVLO CONDITION Figure 5.
PAGE 15
LTC4063 Applications Information Regulator Output Noise Noise measurements on the output should be made with care to ensure accurate results. Coaxial connections and proper shielding should be used to maintain measurement integrity. Figure 7 shows a test setup for taking the measurement. When the output is set to 3V and a 100mA load is applied, the LTC4063 output noise power in the 10Hz to 100kHz band is typically measured to be 135µVRMS.
PAGE 16
LTC4063 Applications Information Protection Features While the thermally regulated charger limits the junction temperature to 105°C during normal operation, current overload at the LDO regulator output may result in excessive power dissipation. Internal circuitry limits the output currents, allowing the battery charger and regulator to be short-circuited to ground indefinitely. Furthermore, if the junction temperature exceeds 150°C, both the battery charger and regulator will shut down.
PAGE 17
LTC4063 Applications Information USB and Wall Adapter Power 5V WALL ADAPTER ICHG = 800mA The LTC4063 allows charging from both a wall adapter and a USB port. Figure 9 shows how to combine wall adapter and USB power inputs. A P-channel MOSFET, MP1, is used to prevent back conducting into the USB port when a wall adapter is present and a Schottky diode, D1, is used to prevent USB power loss through the 1k pull-down resistor.
PAGE 18
LTC4063 Package Description DD Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699 Rev C) 0.70 p0.05 3.55 p0.05 1.65 p0.05 2.15 p0.05 (2 SIDES) PACKAGE OUTLINE 0.25 p 0.05 0.50 BSC 2.38 p0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS R = 0.125 TYP 6 3.00 p0.10 (4 SIDES) 0.40 p 0.10 10 1.65 p 0.10 (2 SIDES) PIN 1 NOTCH R = 0.20 OR 0.35 s 45o CHAMFER PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF 0.75 p0.05 0.00 – 0.05 5 1 (DD) DFN REV C 0310 0.25 p 0.05 0.50 BSC 2.
PAGE 19
LTC4063 Revision History (Revision history begins at Rev C) REV DATE DESCRIPTION PAGE NUMBER C 7/10 Updated Charge Time Termination equation 11 4063fc Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PAGE 20
LTC4063 Typical Application USB/Wall Adapter Power Li-Ion Charger (Using Charge Current Termination) 5V WALL ADAPTER 10 USB POWER BAT VCC 1 LTC4063 1µF 7 TIMER PROG IDET 1k + Li-Ion CELL 9 2.5k 8 GND 11 100mA/ 500mA 2k 10k µC 4063 TA03 Related Parts PART NUMBER DESCRIPTION COMMENTS LTC1733 Monolithic Lithium-Ion Linear Battery Charger Standalone Charger with Programmable Timer, Up to 1.