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MAX1645, MAX1645A
Advanced-Chemistry-Independent, Level-2 Battery Chargers with Input Current Limiting
SMBus™ Controlled, Chemistry Independent Smart Battery Charger with Input Current Limiting and Safety Timer
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Status
Active: In Production.
Description
The MAX1645 is a high-efficiency battery charger capable of charging batteries of any chemistry type. It uses the Intel® System Management Bus (SMBus™) to control voltage and current charge outputs.
When charging lithium-ion (Li+) batteries, the MAX1645 automatically transitions from regulating current to regulating voltage. The MAX1645 can also limit line input current so as not to exceed a predetermined current drawn from the DC source. A 175sec charge safety timer prevents "runaway charging" should the MAX1645 stop receiving charging voltage/current commands.
The MAX1645 employs a next-generation synchronous buck control circuitry that lowers the minimum input-to-output voltage drop by allowing the duty cycle to exceed 99%. The MAX1645 can easily charge one to four series Li+ cells.
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Data Sheet
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An evaluation kit is available: MAX1645BEVKIT, MAX1645BEVSYS
Key Features
- Input Current Limiting
- 175sec Charge Safety Timeout
- 128mA Wake-Up Charge
- Charges Any Chemistry Battery: Li+, NiCd, NiMH, Lead Acid, etc.
- Intel SMBus 2-Wire Serial Interface
- Compliant with Level 2 Smart Battery Charger Spec. Rev. 1.0
- +8V to +28V Input Voltage Range
- Up to 18.4V Battery Voltage
- 11-Bit Battery Voltage Setting
- ±0.8% Output Voltage Accuracy with Internal Reference
- 3A max Battery Charge Current
- 6-Bit Charge Current Setting
- 99.99% max Duty Cycle for Low-Dropout Operation
- Load/Source Switchover Drivers
- >97% Efficiency
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Applications/Uses
- Notebook Computers
- PDAs and Other Handheld Devices
- Point-of-Sale Terminals
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Key Specifications:
| Battery Chargers |
| Part Number |
Cell Chemistry |
NiMH/ NiCd Cells |
Lithium Ion Cells |
Protected VIN
(V) |
Charging VIN
(V) |
Charge Rate Set by |
Max. ICHG
(A) |
Charge Termination |
Charge Regulation |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max |
max |
≥ |
max w/pins |
See Notes |
| MAX1645 |
| Lead Acid | | Li-Ion | | Li-Polymer | | NiCd | | NiMH | | Universal |
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28 |
28 |
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3 |
Smart Battery Control |
Switchmode |
-40 to +85 |
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61.9 |
- |
| MAX1645A |
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- |
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See All Battery Chargers (68)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
 Typical Operating Circuit
Notes and Comments
128mA Wake-Up Charge, 11-Bit Battery Voltage setting, 6-Bit Charge Current Setting
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1566
Rev 2;
2001-12-12
This page last modified: 2007-06-04
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