LTC4054 – LTH7 Standalone Linear Li-Ion Battery Charger SOT23-5

LTC4054 – LTH7 Standalone Linear Li-Ion Battery Charger IC SOT23-5 is a complete constant-current/constant-voltage linear charger designed for single-cell lithium-ion batteries. With its compact SOT23-5 package and minimal external components, it is ideal for portable and space-constrained applications.

Key Features:

• Standalone Operation: No external MOSFET, sense resistor, or blocking diode required
• Thermally Regulated: Reduces charge current automatically during high power dissipation
• Preset 4.2V Charge Voltage: ±1% accuracy ensures safe and full charge
• Automatic Recharge: Automatically recharges battery if voltage drops
• Charge Status Output: Indicates charging or charge complete

Technical Specifications:

• Input Voltage Range: 4.25V to 6.5V
• Charge Current: Up to 800mA (programmable with external resistor)
• Charge Voltage: 4.2V ±1%
• Battery Type: Single-cell Li-Ion / Li-Polymer
• Shutdown Current: < 1µA
• Operating Temperature: -40°C to +85°C

Mechanical Specifications:

• Package Type: SOT-23-5 (Small Outline Transistor)
• Mount Type: Surface-mount (SMT)
• Thermal Protection: Built-in thermal limiting

Dimensions:

• Package Length: Approx. 3.0mm
• Package Width: Approx. 1.75mm
• Package Height: Approx. 1.0mm
• Lead Pitch: 0.95mm

Mounting Options:

• SMD reflow soldering on PCB
• Compatible with standard pick-and-place machines

Schematic Diagram, Connection, Wiring and Pinout:

• Pin 1: PROG – Programs the charge current
• Pin 2: GND – Ground
• Pin 3: BAT – Battery connection
• Pin 4: VCC – Input voltage (4.25V to 6.5V)
• Pin 5: CHRG – Open-drain status output
• Refer to manufacturer datasheet for full schematic and design notes

Datasheet/User Manual:

• Datasheet

Applications:

• Portable Devices: Mobile phones, MP3 players, GPS modules
• Wearable Electronics: Smart bands, fitness trackers
• DIY Projects: Battery charging circuits, solar-powered devices
• Battery Backup: Small UPS systems, RTC backup power

Equivalent:

• MCP73831: Microchip equivalent linear Li-Ion charger
• TP4056: Common Chinese alternative with micro-USB or Type-C
• CN3052A: Similar functionality IC for single-cell charging

Package Includes:

• 1 x LTC4054 LTH7 Battery Charger IC – SOT23-5