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MAX1737

Features: *Stand-Alone Charger for Up to Four Li+ Cells* ±0.8% Accurate Battery Regulation Voltage* Low Dropout: 98% Duty Cycle* Safely Precharges Near-Dead Cells* Continuous Voltage and Temperature Monitoring* <1µA Shutdown Battery Current* Input Voltage Up to +28V* Safety Timer Prevents...

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SeekIC No. : 004409280 Detail

MAX1737: Features: *Stand-Alone Charger for Up to Four Li+ Cells* ±0.8% Accurate Battery Regulation Voltage* Low Dropout: 98% Duty Cycle* Safely Precharges Near-Dead Cells* Continuous Voltage and Temperature...

MAX1737 Data Sheet

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Part Number:
MAX1737
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/27

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Product Details

Description



Features:

* Stand-Alone Charger for Up to Four Li+ Cells
* ±0.8% Accurate Battery Regulation Voltage
* Low Dropout: 98% Duty Cycle
* Safely Precharges Near-Dead Cells
* Continuous Voltage and Temperature Monitoring
* <1µA Shutdown Battery Current
* Input Voltage Up to +28V
* Safety Timer Prevents Overcharging
* Input Current Limiting
* Space-Saving 28-Pin QSOP
* 300kHz PWM Oscillator Reduces Noise
* 90% Conversion Efficiency


Application

* Notebook Computers
* Hand-Held Instruments
* Li+ Battery Packs
* Desktop Cradle Chargers


Pinout

Connection Diagram


Specifications

CSSP, CSSN, DCIN to GND.......................................-0.3V to +30V
BST, DHI to GND......................................................-0.3V to +36V
BST to LX...................................................................-0.3V to +6V
DHI to LX ...........................................-0.3V to ((BST - LX) + 0.3V)
LX to GND .................................................-0.3V to (CSSN + 0.3V)
FULLCHG, FASTCHG, FAULT to GND ........................-0.3V to +30V
VL, VLO, SHDN, CELL, TIMER1, TIMER2, CCI,
   CCS, CCV, REF, ISETIN, ISETOUT, VADJ,
   THM to GND...........................................................-0.3V to +6V
DLO to GND................................................-0.3V to (VLO + 0.3V)
BATT, CS to GND....................................................-0.3V to +20V
PGND to GND, CSSP to CSSN................................-0.3V to +0.3V
VL to VLO .............................................................-0.3V to +0.3V
VL Source Current..............................................................50mA
Continuous Power Dissipation (TA = +70)
   28-Pin QSOP (derate 10.8mW/°C above +70).........860mW
Operating Temperature Range ............................-40 to +85
Junction Temperature......................................................+150
Storage Temperature Range .............................-65 to +150
Lead Temperature (soldering, 10s) .................................+300


Description

The MAX1737 is a switch-mode lithium-ion (Li+) battery charger that charges one to four cells. It provides regulated charging current and a regulated voltage with only a ±0.8% total voltage error at the battery terminals. The external N-channel switch and synchronous rectifier provide high efficiency over a wide input voltage range. A built-in safety timer automatically terminates charging once the adjustable time limit has been reached.

The MAX1737 regulates the voltage set point and charging current using two loops that work together to transition smoothly between voltage and current regulation. An additional control loop monitors the total current drawn from the input source to prevent overload of the input supply, allowing the use of a low-cost wall adapter.

The per-cell battery voltage regulation limit is set between +4.0V and +4.4V and can be set from one tofour by pin strapping. Battery temperature is monitored by an external thermistor to prevent charging if the battery temperature is outside the acceptable range.

The MAX1737 is available in a space-saving 28-pin QSOP package. Use the evaluation kit (MAX1737EVKIT) to help reduce design time.




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