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MAX1925, MAX1926
Switch-Mode 1-Cell Li+ Chargers
Smallest, Simplest Switch-Mode Li+ Charger in 4mm x 4mm QFN Package
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Status
Active: In Production.
Description
The MAX1925/MAX1926 single-cell lithium-ion (Li+) switch-mode battery chargers use an external PMOS pass element step-down configuration. Charge current is programmable, and an external capacitor sets the maximum charge time.
Additional features include automatic input power detection (active-low ACON output), logic-controlled enable, and temperature monitoring with an external thermistor. The MAX1925 disables charging for inputs greater than 6.1V, while the MAX1926 charges for inputs between 4.25V and 12V.
The MAX1925/MAX1926 feature two precondition levels to restore near-dead cells. The devices source 4mA to a cell that is below 2V while sourcing C/10 to a cell between 2V and 3V. Full charge current is then applied above 3V. A active-low CHG output drives an LED to indicate charging (LED on) and fault conditions (LED blinking).
The MAX1925/MAX1926 are available in a 12-pin
4mm x 4mm thin QFN package and are specified over the extended temperature range (-40°C to +85°C). An evaluation kit is available to speed design.
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Data Sheet
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An evaluation kit is available: MAX1926EVKIT
Key Features
- Small (4mm x 4mm) Package
- 4.25V to 12V Input Range (MAX1926)
- Overvoltage Lockout at 6.1V (MAX1925)
- ±0.75% Battery Regulation Voltage
- Set Charge Current with One Resistor
- Automatic Input Power Sense
- LED (or Logic-Out) Charge Status and Fault Indicator
- Programmable Safety Timer
- Autorestart at Cell = 4V
- Thermistor Monitor Input
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Applications/Uses
- Cradle Chargers
- Digital Still Cameras
- PDAs
- Self-Charging Battery Packs
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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) |
Budgetary Price |
| max |
max |
≥ |
max w/pins |
See Notes |
| MAX1925 |
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1 |
12 |
12 |
Resistor |
2 |
Timer |
Switchmode |
Yes |
-40 to +85 |
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16.8 |
$1.71 @1k |
| MAX1926 |
6.1 |
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$1.71 @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
 Typical Operating Circuit
Application Notes
Reliability Reports
| Reliability Report: |
MAX1926.pdf |
| Show FIT data for: |
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| Request Reliability Report for: |
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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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| MAX1925ETC
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1925ETC+
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1925ETC+T
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Active |
QFN;
Land Pattern: Not Available
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-40°C to +85°C
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See data sheet
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| MAX1925ETC-T
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1926ETC
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244-4*
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-40°C to +85°C
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RoHS/Lead-Free: No
Materials Analysis |
| MAX1926ETC+
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1926ETC+T
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244+4*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX1926ETC-T
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Active |
TQFN;12 pin;16.8 mm²
Outline Drawing:21-0139 (PDF)
Land Pattern: 90-0068 (PDF)
Use pkgcode/variation: T1244-4*
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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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Notes and Comments
The MAX1925/MAX1926 are low-cost and simple charging solutions for 1-cell Li+ batteries.
Similar Products by Function
Evaluation Kits
Products with Similar Part Numbers
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-2556
Rev 1;
2002-11-15
This page last modified: 2007-07-13
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