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MAX8971
Industry's Smallest 1.55A 1-Cell Li+ DC-DC Charger
Switching Charger Delivers High Efficiency (90%~92%)
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Status
Active: In Production.
Description
The MAX8971 is a compact, high-frequency, high-efficiency switch-mode charger for a one-cell lithium-ion (Li+) battery. It delivers up to 1.55A of current to the battery from inputs up to 7.5V and withstands transient inputs up to 22V. The 4MHz switch-mode charger is ideally suited for small portable devices, such as headsets and ultra-portable media players. It minimizes component size and heat.
Battery-protection features include: low-voltage prequalification, charge fault timer, die temperature monitoring, and battery temperature monitoring. The battery temperature monitoring adjusts the charge current and termination voltage for safe use of secondary lithium-ion batteries.
The IC accepts either a general DC input or USB. It has programmable automatic input-current limiting to protect upstream charging sources such as USB.
Charge parameters are easily adjustable through an I²C interface. Charge is terminated based on user-selectable minimum current level. A safety timer with reset control provides a safety backup for I²C interface. Charge status is provided to the application processor through an interrupt pin.
The IC is available in a space-saving, 20-bump, 2.18mm x 1.62mm WLP package.
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Data Sheet
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Key Features
- Switch-Mode Charger
- High-Efficiency
- Low Heat
- Fast Charge Time
- Small and Simple
- Precise
- Up to ±5% Current Regulation and 0.5% Voltage Regulation
- Safe
- JEITA Battery Temperature Monitor
- Over/Undervoltage Protection, Safety Timers, Temperature Regulation
- USB Friendly
- Flexible
- Programmable Voltage/Current
- Status/Interrupts Through I2C
- Automatic Input Current Limit
- I²C Interface
- Input Current Limit (100mA to 1500mA)
- Fast-Charge/ Termination Current (250mA to 1550mA)
- Charge Voltage (4.1V, 4.15V, 4.2V, 4.35V)
- Safety Timer
- Termination Enable
- +22V Absolute Maximum Input Voltage Rating
- Up to 7.5V Maximum Operating Input Voltage
- 5V USB/Safeout LDO for USB PHY
- 2.3A GSM RF Test Mode (Factory Testing)
- Charge Current to Voltage Conversion (VICHG) for Baseband ADC
- Reverse Battery Leakage Protection
- Input/Output Overvoltage Protection
- Interrupt Status Output
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Applications/Uses
- Digital Cameras
- GPS, PDAs
- Headsets and Media Players
- Smartphones
- USB Charging
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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 |
Budgetary Price |
| max |
max |
≥ |
See Notes |
| MAX8971 NEW! |
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1 |
22 |
7.5 |
I2C/SMBus |
1.55 |
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Switchmode |
Yes |
-40 to +85 |
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$1.19 @1k |
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See All Battery Chargers (70)
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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
Simplified Operating Circuit
Product Guides
Reliability Reports
| 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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| MAX8971EWP+
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Active |
WLP;20 pin;WLP;
Outline Drawing:21-0544 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: W201B2+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
Materials Analysis |
| MAX8971EWP+T
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Active |
WLP;20 pin;WLP;
Outline Drawing:21-0544 (PDF)
Land Pattern: Not Available
Use pkgcode/variation: W201B2+1*
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-40°C to +85°C
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RoHS/Lead-Free: Lead Free
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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Information Index
Document Ref.: 19-4245
Rev 0;
2012-02-27
This page last modified: 2012-04-10
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