MAX8934D
PRODUCTIONDual-Input Linear Chargers, Smart Power Selector with Advanced Battery Temperature Monitoring
Safely Charges a Li+ Cell Following JEITA-Recommended Safe Charging Methods
- Part Models
- 2
- 1ku List Price
- Starting From $3.72
Overview
- 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)
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.
Applications
- Digital Still Cameras and Digital Video Cameras
- Handheld Game Systems
- PDAs, Palmtop, and Wireless Handhelds
- Portable Media, MP3 Players, and PNDs
Documentation
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX8934DETI+ | Thin Quad Flatpack, No Leads | ||
| MAX8934DETI+T | Thin Quad Flatpack, No Leads |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Request a Driver/SoftwareHardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Battery Charger ICs 5 | ||
| MAX8903 | 2A 1-Cell Li+ DC-DC Charger for USB and Adapter Power | |
| MAX8601 | PRODUCTION | Single-/Dual-Input 1-Cell Li+ Chargers with OVP Protection and Programmable Charge Timer |
| MAX8677A | PRODUCTION | 1.5A Dual-Input, USB/AC Adapter Charger and Smart Power Selector |
| MAX8677C | PRODUCTION | 1.5A Dual-Input USB/AC Adapter Charger and Smart Power Selector |
| MAX8934G | PRODUCTION | Dual-Input Linear Charger, Smart Power Selector with Advanced Battery Temperature Monitoring |
Evaluation Kits
Evaluation Kit for the MAX8934A, MAX8934B, MAX8934C, MAX8934D, and MAX8934E
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