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Highly Integrated, Linear Battery Charger with Thermal Regulation for Portable Applications

First Temperature-Regulated, CC-CV Battery Charger with Overvoltage Protection for Portable Applications

Product Details

Key Features

Applications/Uses

Parametric specs for Battery Chargers
Charging VIN (V) (max) 6.25
Max. ICHG (A) 1.4
Cell Chemistry Li-Ion
Li-Polymer
NiCd
NiMH
# NiMH/ NiCd Cells 3
# Lithium Ion Cells 1
Protected VIN (V) (max) 13
Charger (V) 4.1
4.2
4.5
4.95
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/16
Budgetary
Price (See Notes)
2.45
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Simplified Block Diagram

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Parameters

Parametric specs for Battery Chargers
Charging VIN (V) (max) 6.25
Max. ICHG (A) 1.4
Cell Chemistry Li-Ion
Li-Polymer
NiCd
NiMH
# NiMH/ NiCd Cells 3
# Lithium Ion Cells 1
Protected VIN (V) (max) 13
Charger (V) 4.1
4.2
4.5
4.95
Oper. Temp. (°C) -40 to +85
Package/Pins TQFN/16
Budgetary
Price (See Notes)
2.45

Key Features

  • Stand-Alone 1-Cell Li+ Charging, Microprocessor- Controlled 3-Cell NiMH/NiCd Charging
  • No FET, Reverse-Blocking Diode, or Current- Sense Resistor Required
  • 1.4A (max) Programmable Fast-Charge Current
  • +95°C, +115°C, and +135°C Proprietary Programmable Die Temperature Regulation Control
  • 4.5V to 13V Input Voltage Range with Input Overvoltage (OVLO) Protection Above 6.5V
  • Programmable Top-Off Current Threshold: 10%, 20%, or 30% of the Fast-Charge Current
  • Charge-Current Monitor for Fuel Gauging
  • Programmable Safety Timer (3, 4.5, or 6 hours)
  • Input Power Detection Output (active-low ACOK) and Charge Enable Input (active-low CHGEN)
  • Automatic Recharge
  • Digital Soft-Start Limits Inrush Current
  • Charge Status Outputs for LEDs or µP Interface

Applications/Uses

  • Bluetooth® Equipment
  • Cell Phones/Cordless Phones
  • Charging Cradles and Docks
  • Digital Cameras and MP3 Players
  • PDAs
  • USB Appliances

Description

The MAX1501 intelligent, constant-current, constant-voltage (CCCV), temperature-regulated battery charger charges a single lithium-ion (Li+) cell or three-cell NiMH/NiCd batteries. The device integrates the current-sense resistor, PMOS pass element, and thermal-regulation circuitry, while eliminating the reverse-blocking Schottky diode to create the simplest charging solution for hand-held equipment.

For single-cell Li+ batteries, the MAX1501 functions as a stand-alone charger to control the charging sequence from the prequalification state through fast charge, top-off, and charge termination. With 3-cell NiMH/NiCd batteries, the MAX1501 requires collaboration with a microcontroller to determine the best charging algorithm. Proprietary thermal-regulation circuitry limits the die temperature when fast charging or while exposed to high ambient temperatures, allowing maximum charging current without damaging the charger. The MAX1501 continually supplies a regulated output voltage under no-battery conditions, allowing battery changing without interrupting system power.

The device achieves high flexibility by providing an adjustable fast-charge current, top-off current, safety timer (disabled in the MAX1501Z), and thermal-regulation setpoint. Other features include input power detection (active-low ACOK) and input under-/overvoltage protection. The MAX1501 provides active-low control inputs.

The MAX1501 accepts a 4.5V to 13V supply, but disables charging when the input voltage exceeds 6.5V, preventing excessive power dissipation. The MAX1501 operates over the extended temperature range (-40°C to +85°C) and is available in a compact 16-pin thermally enhanced 5mm x 5mm thin QFN package with 0.8mm profile.

Simplified Block Diagram

MAX1501: Typical Operating Circuit MAX1501: Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .