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MAX1879
Simple, Efficient, 1-Cell Li+ Pulse Charger
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Status
Active: In Production.
Description
The MAX1879 single-cell lithium-ion (Li+) battery charger utilizes an efficient pulse-charging architecture to minimize power dissipation in portable devices. This architecture combines the efficiency of switch-mode chargers with the simplicity and low cost of linear chargers. This simple device, in conjunction with a current-limited wall cube and a PMOS transistor, allows safe and fast charging of a single Li+ cell.
The MAX1879 initiates charging in one of three ways: battery insertion, charger power-up, or toggling the THERM pin. Key safety features include continuous voltage and temperature monitoring, a preset charger time-out, and an 8mA precharge current mode to charge near-dead cells. Automatic detection of input power removal shuts down the device, minimizing current drain from the battery. An overall system accuracy of 0.75% ensures that the cell capacity is fully utilized without cycle life degradation.
The MAX1879 is offered in a space-saving 8-pin µMAX® package. An evaluation kit (MAX1879EVKIT) is available to help reduce design time.
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Data Sheet
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An evaluation kit is available: MAX1879EVKIT
Key Features
- Simple Design Minimizes Heat
- Low Component Count, No Inductor
- Battery-Full Indicator
- 0.75% Accurate Battery Regulation
- 1.5µA (max) Battery Current Drain with Wall Cube Removed
- Restart Charging at 4.0V
- Continuous Overvoltage and Overtemperature Protection
- Safely Precharges Near-Dead Cells
- Automatic Power-Down when Power Source is Removed
- Charges 1 Cell from as Low as 4.5V
- Pin-Compatible Upgrade to MAX1679
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Applications/Uses
- Cell Phones
- Consumer Audio
- Cordless Phones
- Digital Still Cameras
- Global Positioning Systems (GPS)
- Pagers
- Palmtops, Handy Terminals
- Pen Entry Palmtops, PDAs and Organizers
- Smart Battery Packs/Chargers
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Key Specifications:
| Battery Chargers |
| Part Number |
Cell Chemistry |
Lithium Ion Cells |
Protected VIN
(V) |
Charging VIN
(V) |
Charge Rate Set by |
Max. ICHG
(A) |
Charge Termination |
Charge Regulation |
EV Kit |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
| max |
max |
≥ |
max w/pins |
| MAX1879 |
|
1 |
22 |
22 |
External Source |
2 |
External Control |
Pulse |
Yes |
-40 to +85 |
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16.2 |
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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
Application Notes
Reliability Reports
Software/Models
Ordering Information
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Part Number
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Free
Sample |
Buy |
Status
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Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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Temp |
RoHS/Lead-Free?
Materials Analysis
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| MAX1879EUA
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1879EUA+
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1879EUA+T
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1879EUA-T
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Active |
µMAX;8 pin;16.2 mm²
Outline Drawing:21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8-1*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
Notes:
- Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
- Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
- Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
- * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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Similar Products by Function
| MAX1736 |
SOT23, Single-Cell Li+ Battery Charger for Current-Limited Supply |
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Evaluation Kits
Products with Similar Part Numbers
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2061
Rev 0;
2001-05-30
This page last modified: 2007-06-15
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