MAX1687
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MAX1687

Step-Up DC-DC Converters with Precise, Adaptive Current Limit for GSM

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Reduces GSM Battery Peak Current by 6x, Eliminates DC-DC Noise during Transmission with User Selectable Disable

Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 3
1ku List Price Starting From $3.39
Features
  • 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
Additional Details
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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
Part Models 3
1ku List Price Starting From $3.39

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
MAX1687ESA+
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MAX1687ESA+T
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MAX1687EUE+
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Part Models

Product Lifecycle

PCN

Jul 3, 2023

- 2361NA

WAFER FAB

MAX1687ESA+

PRODUCTION

Oct 30, 2020

- 1702R2

ASSEMBLY

MAX1687ESA+

PRODUCTION

Dec 11, 2018

- 1754N

ASSEMBLY

MAX1687EUE+

LAST TIME BUY

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jul 3, 2023

- 2361NA

arrow down

WAFER FAB

MAX1687ESA+

PRODUCTION

Oct 30, 2020

- 1702R2

arrow down

ASSEMBLY

MAX1687ESA+

PRODUCTION

Dec 11, 2018

- 1754N

arrow down

ASSEMBLY

MAX1687EUE+

LAST TIME BUY

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

MAX1687EVKIT

Evaluation Kit for the MAX1687, MAX1688

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MAX1687EVKIT

Evaluation Kit for the MAX1687, MAX1688

Evaluation Kit for the MAX1687, MAX1688

Features and Benefits

  • 2.7V to 6V Input Voltage Range
  • 5V Output Voltage
  • Less than 500mV Output Voltage Droop with 1.42A Burst Current
  • 90% Efficiency
  • Output Disconnected from Input during Shutdown
  • 600kHz Switching Frequency
  • Internal MOSFET and Synchronous Rectifier
  • 3µA IC Shutdown Current
  • Surface-Mount Components (TSSOP Package)
  • Fully Assembled and Tested

Product Detail

The MAX1688 evaluation kit (EV kit) is a boost switching regulator for one Li-Ion cell or three NiCd/NiMH cells in battery-powered systems. The EV kit accepts a positive input between 2.7V and 6V and converts it to a 5V output. It can easily deliver the current burst required for cell-phone power amplifier systems. The MAX1688 reduces battery surge current by slowly charging a reservoir capacitor, which supplies the necessary peak energy for the current burst. As a result, the peak battery input current is limited, thereby minimizing the battery voltage sag and transient dips. The EV kit operates at 600kHz, allowing the use of small external components.

The MAX1688 EV kit provides low quiescent current and high efficiency for maximum battery life. An internal synchronous rectifier is used to provide over 90% conversion efficiency. This EV kit is a fully assembled and tested surface-mount circuit board. The MAX1688 EV kit can also be used to evaluate the MAX1687.

Applications

  • GSM Phones
  • PC Cards (PCMCIA)
  • Wireless Handsets

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