Analog Devices / Maxim Integrated MAX668 & MAX669 PWM Step-Up Controllers
Analog Devices MAX668 and MAX669 PWM Step-Up Controllers are constant-frequency, pulse-width modulating (PWM), and current-mode DC-DC controllers. These Analog Devices devices are designed for various DC-DC conversion applications, including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%. The 1.8V to 28V input voltage range supports various battery and AC-powered inputs. An advanced BiCMOS design features a low operating current (220µA), adjustable operating frequency (100kHz to 500kHz), soft-start, and a SYNC input allowing the MAX668 and MAX669s oscillator to be locked to an external clock.
The MAX669, optimized for low input voltages with a guaranteed start-up voltage of 1.8V, requires a boot-strapped operation. It supports output voltages up to 28V. The MAX668 operates with inputs as low as 3V and can be connected in either a bootstrapped or non-bootstrapped (IC powered from input supply or another source) configuration.
The Analog Devices MAX668 and MAX669 PWM Step-Up Controllers are available in a highly compact 10-pin μMAX package with a -40°C to +85°C operating temperature range.
Features
- 1.8V Minimum Start-Up Voltage (MAX669)
- Wide Input Voltage Range (1.8V to 28V)
- Tiny 10-Pin µMAX Package
- Current-Mode PWM and Idle Mode Operation
- Efficiency Over 90%
- Adjustable 100kHz to 500kHz Oscillator or SYNC Input
- 220µA Quiescent Current
- Logic-Level Shutdown
- Soft-Start
- -40°C to +85°C operating temperature range
- 10-pin μMAX package
Applications
- Cell Phones
- LANs and Network Systems
- POS Systems
- Telecom Hardware
Related Products
Analog Devices / Maxim Integrated Switching Regulators
Highly efficient to support longer battery life, generate less heat, and consume less board space.
Development Tools
Analog Devices / Maxim Integrated MAX668EVKIT Evaluation Kit
Demonstration platform for the MAX668 and MAX669 Constant-Frequency PWM Step-Up Controllers.
Typical Applicatrion Circuit
