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MAX1772
Low-Cost, Multichemistry Battery-Charger Building Block
0.7% Accurate, Input-Current-Limited, Multichemistry Battery Charger Offers Most Complete Solution
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Status
Active: In Production.
Description
The MAX1772 is a highly-integrated, multichemistry
battery-charger control IC that simplifies the construction
of accurate and efficient chargers. The MAX1772
uses analog inputs to control charge current and voltage
and can be programmed by the host or hardwired.
High efficiency is achieved by a buck topology with
synchronous rectification.
Maximum current drawn from the AC adapter is programmable
to avoid overloading the AC adapter when
supplying the load and the battery charger simultaneously.
This enables the user to reduce the cost of the
AC adapter. The MAX1772 provides outputs that can
be used to monitor the current drawn from the AC
adapter, battery-charging current, and the presence of
an AC adapter.
The MAX1772 can charge two to four lithium-ion (Li+)
series cells, easily providing 4A. When charging, the
MAX1772 automatically transitions from regulating current
to regulating voltage. It is available in a space-saving
28-pin QSOP package.
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Data Sheet
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An evaluation kit is available: MAX1772EVKIT
Key Features
- Input Current Limiting
- ±0.5% Output Voltage Accuracy Using Internal
Reference (0°C to +85°C)
- Programmable Battery Charge Current >4A
- Analog Inputs Control Charge Current and
Charge Voltage
- Monitor Outputs for:
- Current Drawn from AC Input Source
- Charging Current
- AC Adapter Present
- Up to 18.2V (max) Battery Voltage
- 8V to 28V Input Voltage
- >95% Efficiency
- 99.99% (max) Duty Cycle for Low-Dropout
Operation
- Charges Any Battery Chemistry: Li+, NiCd, NiMH,
Lead Acid, etc.
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Applications/Uses
- Handheld Terminals
- Notebook and Subnotebook Computers
- PDAs and Other Handheld Devices
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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 |
| MAX1772 |
| Lead Acid | | Li-Ion | | Li-Polymer | | NiCd | | NiMH | | Universal |
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28 |
28 |
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4 |
External Control |
Switchmode |
-40 to +85 |
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61.9 |
$5.42 @1k |
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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
Pin Configuration
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-1772
Rev 4;
2009-03-16
This page last modified: 2009-10-27
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