MAX1677 Datasheet PDF | Maxim Integrated

Maxim Integrated MAX1677

The MAX1677 is a compact, high-efficiency, dual-output boost converter for portable devices needing two regulated supplies, typically for logic and liquid crystal displays (LCDs). The device requires no external FETs and can maintain regulation while consuming only 20µA, making it ideal for hand-held pen-input and PDA devices operating with low-current “sleep” states. The MAX1677’s primary regulator supplies up to 350mA at either a factory-preset 3.3V or an adjustable 2.5V to 5.5V output.

Part No.	MAX1677
Datasheet	MAX1677 Download
Manufacturer	Maxim Integrated
Description	Compact / High-Efficiency / Dual-Output Step-Up and LCD Bias DC-DC Converter
Buy	Stock & Price

GENERAL DESCRIPTION

FEATURES

o No External FETs Required o Main Output Up to 350mA for Logic Supply Fixed 3.3V or Adjustable (2.5V to 5.5V) Synchronous Rectification for High Efficiency (up to 95%) 300kHz (200kHz to 400kHz Synchronizable) Fixed-Frequency PWM Operation o Secondary Output Up to +28V or -28V for LCD Bias Programmable Current Limit o 0.7V to 5.5V Input Voltage Range o 20µA Quiescent Current o 1µA Shutdown Current o Low-Battery Comparator o Small 16-Pin QSOP Package MAX1677 Operation with inputs as low as 0.7V allows the MAX1677 to accept 1, 2, or 3-cell alkaline, NiCd, or NiMH batteries as well as 1-cell lithium-ion batteries. On-chip synchronous rectification provides efficiencies up to 95%. 300kHz (or externally clocked) pulse-width-modulation (PWM) operation is particularly suitable for applications needing low noise, such as those with wireless features. The primary converter also features pin-selectable pulse-frequencymodulation (PFM) operation that consumes only 20µA.