MAX1688
LAST TIME BUYStep-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM
Reduces GSM Battery Peak Current by 6x, Eliminates DC-DC Noise during Transmission with User Selectable Disable
- Part Models
- 2
- 1ku List Price
- Starting From $3.84
Overview
- Low 450mA Peak Battery Current Provides 2A, 5V GSM Burst
- 90% Efficiency
- Internal Power MOSFETs and Current-Sense Resistor
- Output Disconnects from Input During Shutdown
- 3µA Shutdown Current
- Precise Voltage-Controlled Current Limit (MAX1687)
- Adaptive Constant-Recharge-Time Capability (MAX1688)
- 1.25V to 6V Adjustable Output
- 2.7V to 6V Input Range (1 Li-Ion cell or 3 NiMH cells)
- Switching Frequency Can Exceed 1MHz
- Standby Mode Disables DC-DC During Transmission Burst
- Low Inrush Current at Start-Up
The MAX1687/MAX1688 step-up DC-DC converters deliver up to 2W from a single Li-Ion or three NiMH cells. The devices are ideal for burst-load applications such as GSM cell phones and wireless LANs, where the RF power amplifiers require short, high current bursts. The MAX1687/MAX1688 reduce battery surge current by slowly charging a reservoir capacitor, which supplies the necessary peak energy for the load current burst. As a result, the peak battery current is limited, thus maximizing battery life and minimizing battery voltage sag and transient dips.
An internal synchronous rectifier provides over 90% conversion efficiency and eliminates the need for an external Schottky diode. A logic shutdown mode reduces the shutdown current to only 3µA. The devices can be disabled during current bursts (RF transmit mode) to eliminate switching noise.
The switching frequency of the MAX1687/MAX1688, controlled by the selected inductor, can exceed 1MHz. Two external resistors set the output voltage from 1.25V to 6V. The MAX1687 controls peak battery current, while the MAX1688 features a more advanced, adaptive constant-recharge-time algorithm that maximizes battery life. The MAX1687/MAX1688 are available in thin 16-pin TSSOP (1.1mm max height) or standard 8-pin SO packages.
Applications
- GSM Phones
- PC Cards (PCMCIA)
- Wireless Handsets
Documentation
Data Sheet 1
Technical Articles 1
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 |
|---|---|---|---|
| MAX1688EUE+ | Thin Shrink Small-Outline Package | ||
| MAX1688EUE+T | Thin Shrink Small-Outline Package |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareEvaluation Kits
Evaluation Kit for the MAX1687, MAX1688
Evaluation Kit for the MAX1687, MAX1688
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