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MAX8934A, MAX8934B, MAX8934C, MAX8934D, MAX8934E
Dual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
Safely Charges a Li+ Cell Following JEITA-Recommended Safe Charging Methods
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Status
Active: In Production.
Description
The MAX8934_ dual-input Li+/Li-Poly linear battery chargers with Smart Power Selector™ safely charge a single Li+/Li-Poly cell in accordance with JEITA recommendations. The MAX8934_ monitors the battery temperature (TBATT) while charging, and automatically adjusts the fast-charge current and charge termination voltage as the battery temperature varies. The MAX8934_ also monitors the battery temperature while the battery is discharging, and provides a warning flag (active-low OT) to the system in the event that the battery is over temperature. Two safety profiles are supported (see Figure 6 in the full data sheet for details). An ultra-low IQ, always-on LDO provides an additional 3.3V supply for system power.
The MAX8934_ operates with either separate inputs for USB and AC adapter power*, or from a single input that accepts both. All power switches for charging and switching the load between battery and external power
are included on-chip. No external MOSFETs are required.
The MAX8934_ features a Smart Power Selector to make the best use of limited USB or adapter power. Input current limit and battery charge current limit are
independently set. Input power not used by the system charges the battery. Charge current limit and DC current limit can be set up to 1.5A and 2A, respectively, while USB input current can be set to 100mA or 500mA for the
MAX8934A/MAX8934B/MAX8934C/MAX8934E and up to 1.5A (max) for the MAX8934D. Automatic input selection switches the system load from battery to external power.
The MAX8934A provides a SYS output voltage of 5.3V, while the MAX8934B–MAX8934E provide a SYS output voltage of 4.35V.
Other features include overvoltage protection (OVP), open-drain charge status and fault outputs, power-OK monitors, charge timers, and a battery thermistor monitor. Additionally, on-chip thermal limiting reduces the battery charge-rate to prevent charger overheating. The MAX8934_ is available in a 28-pin, 4mm x 4mm, TQFN package.
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Data Sheet
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An evaluation kit is available: MAX8934AEVKIT
Key Features
- Li+ Charger with Smart Power Selector, No External MOSFETs Needed
- Monitors Battery Temperature and Adjusts Charge Current and Termination Voltage Automatically per JEITA Recommendations
- Active-Low OT Flags System of a Hot Battery During Discharge
- Ultra-Low IQ, Always-On 3.3V LDO
- Common or Separate USB and Adapter Inputs
- Automatic Adapter/USB/Battery Switchover
- Load Peaks in Excess of Adapter Rating are Supported by Battery
- Input OVP to 16V (DC) and 9V (USB)
- 40mΩ SYS-to-BATT Switch
- Thermal Regulation Prevents Overheating
- 4.35V or 5.3V SYS Regulation Voltage
- 1.5A (max) USB Input Current Limit (MAX8934D)
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Applications/Uses
- Digital Still Cameras and Digital Video Cameras
- Handheld Game Systems
- PDAs, Palmtop, and Wireless Handhelds
- Portable Media, MP3 Players, and PNDs
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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 |
| max |
max |
≥ |
| MAX8934 |
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1 |
14 |
6.6 |
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1.5 |
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Linear |
Yes |
-40 to +85 |
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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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| *Protected by U.S.Patent #6,507,172. |
Diagram
Typical Operating Circuit
More Information
Didn't Find What You Need?
Information Index
Document Ref.: 19-4995
Rev 2;
2010-07-13
This page last modified: 2011-01-06
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