|
MAX846A
Cost-Saving, Multichemistry, Battery Charger System
Universal Charger with Low-Cost µC or Stand-Alone Li+ Charger
|
Status
Active: In Production.
Description
The MAX846A is a cost-saving multichemistry battery-charger system that comes in a space-saving 16-pin QSOP. This integrated system allows different battery chemistries (Li-Ion, NiMH or NiCd cells) to be charged using one circuit.
In its simplest application, the MAX846A is a stand-alone, current-limited float voltage source that charges Li-Ion cells. It can also be paired up with a low-cost microcontroller (µC) to build a universal charger capable of charging Li-Ion, NiMH, and NiCd cells.
An internal 0.5%-accurate reference allows safe charging of Li-Ion cells that require tight voltage accuracy. The voltage- and current-regulation loops used to control a low-cost external PNP transistor (or P-channel MOSFET) are independent of each other, allowing more flexibility in the charging algorithms.
The MAX846A has a built-in 1%, 3.3V, 20mA linear regulator capable of powering the µC and providing a reference for the µC's analog-to-digital converters. An on-board reset notifies the controller upon any unexpected loss of power. The µC can be inexpensive, since its only functions are to monitor the voltage and current and to change the charging algorithms.
|
|
Data Sheet
|
An evaluation kit is available: MAX846AEVKIT
Key Features
- Multichemistry Charger System (Li-Ion, NiMH, NiCd)
- Independent Voltage and Current Loops
- ±0.5% Internal Reference for Li-Ion Cells
- Lowers Cost:
- Stands Alone or Uses Low-Cost µC
- Built-In 1% Linear Regulator Powers µC
- Linear Regulator Provides Reference to µC ADCs
- Built-In µC Reset
- Controls Low-Cost External PNP Transistor or P-Channel MOSFET
- Space-Saving 16-Pin QSOP
- Charging-Current-Monitor Output
- < 1µA Battery Drain when Off
|
|
Applications/Uses
- Cell Phones
- Desktop Cradle Chargers
- Handheld Instruments (PDAs, Palmtops)
- Li+ Battery Packs
- Li+-Ion/NiMH/NiCd Multichemistry Battery Chargers
- Notebook Computers
|
|
|
|
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 |
EV Kit |
Oper. Temp.
(°C) |
Package/Pins |
Smallest Available Pckg.
(mm2) |
Budgetary Price |
| max |
max |
≥ |
max w/pins |
See Notes |
| MAX846A |
|
|
|
20 |
20 |
Resistor |
2 |
| Current Limit | | Max. Voltage |
|
Linear |
Yes |
-40 to +85 |
|
30.9 |
$3.25 @1k |
|
See All Battery Chargers (68)
|
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.
|
|
Diagram
 Typical Operating Circuit
Application Notes
Product Guides
Reliability Reports
Software/Models
Ordering Information
|
Part Number
|
Free
Sample |
Buy |
Status
|
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
|
Temp |
RoHS/Lead-Free?
Materials Analysis
|
| MAX846AC/D
|
|
|
Active |
DICE;
Land Pattern: Not Available
|
|
See data sheet
|
| MAX846AEEE
|
|
|
Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16-1*
|
-40°C to +85°C
|
RoHS/Lead-Free: No
Materials Analysis |
| MAX846AEEE+
|
|
|
Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*
|
-40°C to +85°C
|
RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX846AEEE+T
|
|
|
Active |
QSOP;16 pin;30.9 mm²
Outline Drawing:21-0055 (PDF)
Land Pattern: 90-0167 (PDF)
Use pkgcode/variation: E16+1*
|
-40°C to +85°C
|
RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX846AEEE-T
|
|
|
Active |
QSOP;16 pin
Land Pattern: Not Available
|
-40°C to +85°C
|
See data sheet
|
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.
|
Notes and Comments
Stand-alone or µC controlled charger, drives PNP or P-Channel MOSFET, reset output notifies any unexpected power loss
Similar Products by Function
| MAX1647, MAX1648 |
Chemistry-Independent Battery Chargers |
| MAX745 |
Switch-Mode Lithium-Ion Battery-Charger |
| MAX1640, MAX1641 |
Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier |
| MAX1782 |
Advanced Smart Battery-Pack Controller |
|
|
Evaluation Kits
Didn't Find What You Need?
Information Index
Document Ref.: 19-1121
Rev 0;
1996-09-01
This page last modified: 2007-07-19
|
Download
E-Mail