LTC4054
ABSOLUTE AXI U RATI GS <sup>W</sup> <sup>W</sup> <sup>W</sup> <sup>U</sup> PACKAGE/ORDER I FOR ATIO U U <sup>W</sup>
Manufacturer
adi
Overview
Part: LTC4054 from Linear Technology Corporation
Type: Standalone Linear Li-Ion Battery Charger
Key Specs:
- Programmable Charge Current: Up to 800mA
- Preset Charge Voltage: 4.2V with ±1% Accuracy
- Supply Current in Shutdown: 25µA
- Input Supply Voltage (VCC): 4.25V to 6.5V
- Operating Ambient Temperature Range: –40°C to 85°C
Features:
- Programmable Charge Current Up to 800mA
- No MOSFET, Sense Resistor or Blocking Diode Required
- Complete Linear Charger in ThinSOT™ Package for Single Cell Lithium-Ion Batteries
- Constant-Current/Constant-Voltage Operation with Thermal Regulation
- 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 (LTC4054)
- Available Without Trickle Charge (LTC4054X)
- Soft-Start Limits Inrush Current
Applications:
- Cellular Telephones, PDAs, MP3 Players
- Charging Docks and Cradles
- Bluetooth Applications
Package:
- ThinSOT™ Package: null
- 5-Lead SOT-23 Package: null
Features
- Programmable Charge Current Up to 800mA
- No MOSFET, Sense Resistor or Blocking Diode Required
- Complete Linear Charger in ThinSOTTM 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 (LTC4054)
- Available Without Trickle Charge (LTC4054X)
- Soft-Start Limits Inrush Current
- Available in 5-Lead SOT-23 Package
Applications
- Cellular Telephones, PDAs, MP3 Players
- Charging Docks and Cradles
- Bluetooth Applications
Electrical Characteristics
| SYMBOL | PARAMETER | CONDITIONS | MIN | TYP | MAX | UNITS | |
|---|---|---|---|---|---|---|---|
| VCC | Input Supply Voltage | ● | 4.25 | 6.5 | V | ||
| ICC | Input Supply Current | Charge Mode (Note 4), RPROG = 10k Standby Mode (Charge Terminated) Shutdown Mode (RPROG Not Connected, VCC < VBAT, or VCC < VUV) | ● ● ● | 300 200 25 | 2000 500 50 | µA µA µA | |
| VFLOAT | Regulated Output (Float) Voltage | 0°C ≤ TA ≤ 85°C, IBAT = 40mA | 4.158 | 4.2 | 4.242 | V | |
| IBAT | BAT Pin Current | RPROG = 10k, Current Mode RPROG = 2k, Current Mode Standby Mode, VBAT = 4.2V Shutdown Mode (RPROG Not Connected) Sleep Mode, VCC = 0V | ● ● ● | 93 465 0 | 100 500 –2.5 ±1 ±1 | 107 535 –6 ±2 ±2 | mA mA µA µA µA |
| ITRIKL | Trickle Charge Current | VBAT < VTRIKL, RPROG = 2k (Note 5) | ● | 20 | 45 | 70 | mA |
| VTRIKL | Trickle Charge Threshold Voltage | RPROG = 10k, VBAT Rising (Note 5) | 2.8 | 2.9 | 3.0 | V | |
| VTRHYS | Trickle Charge Hysteresis Voltage | RPROG = 10k (Note 5) | 60 | 80 | 110 | mV | |
| VUV | VCC Undervoltage Lockout Threshold | From VCC Low to High | ● | 3.7 | 3.8 | 3.92 | V |
| VUVHYS | VCC Undervoltage Lockout Hysteresis | ● | 150 | 200 | 300 | mV | |
| VMSD | Manual Shutdown Threshold Voltage | PROG Pin Rising PROG Pin Falling | ● ● | 1.15 0.9 | 1.21 1.0 | 1.30 1.1 | V V |
| VASD | VCC – VBAT Lockout Threshold Voltage | VCC from Low to High VCC from High to Low | 70 5 | 100 30 | 140 50 | mV mV | |
| ITERM | C/10 Termination Current Threshold | RPROG = 10k (Note 6) RPROG = 2k | ● ● | 0.085 0.085 | 0.10 0.10 | 0.115 0.115 | mA/mA mA/mA |
| VPROG | PROG Pin Voltage | RPROG = 10k, Current Mode | ● | 0.93 | 1.0 | 1.07 | V |
| ICHRG | CHRG Pin Weak Pull-Down Current | VCHRG = 5V | 8 | 20 | 35 | µA | |
| VCHRG | CHRG Pin Output Low Voltage | ICHRG = 5mA | 0.35 | 0.6 | V | ||
| ∆VRECHRG | Recharge Battery Threshold Voltage | VFLOAT - VRECHRG | 100 | 150 | 200 | mV |
Thermal Information
FEATURES
- Programmable Charge Current Up to 800mA
- No MOSFET, Sense Resistor or Blocking Diode Required
- Complete Linear Charger in ThinSOTTM 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 (LTC4054)
- Available Without Trickle Charge (LTC4054X)
- Soft-Start Limits Inrush Current
- Available in 5-Lead SOT-23 Package
APPLICATIONS
- Cellular Telephones, PDAs, MP3 Players
- Charging Docks and Cradles
- Bluetooth Applications
DESCRIPTION
The LTC®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 LTC4054 ideally suited for portable applications. Furthermore, the LTC4054 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 LTC4054 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 LTC4054 automatically enters a low current state, dropping the battery drain current to less than $2\mu$ A. The LTC4054 can be put into shutdown mode, reducing the supply current to $25\mu$ A.
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.
T, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*U.S.Patent No. 6,522,118
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