ADP1611

www.DataSheet4U.com 20 V,1.2 MHz Step-Up DC-to-DC Switching Converter ADP1611 FEATURES Fully integrated 1.2 A , 0.23 Ω power switch Pin-selectable 700 kHz or 1.2 MHz PWM frequency 90% efficiency Adjustable output voltage up to 20 V 3% output regulation accuracy Adjustable soft start Input undervoltage lockout MSOP 8-lead package GENERAL DESCRIPTION The ADP1611 is a step-up dc-to-dc switching converter with an integrated 1.2 A, 0.23 Ω power switch capable of providing an output voltage as high as 20 V. With a package height of less than 1.1 mm, the ADP1611 is optimal for space-constrained applications such as portable devices or thin film transistor (TFT) liquid crystal displays (LCDs). The ADP1611 operates in pulse-width modulation (PWM) current mode with up to 90% efficiency. Adjustable soft start prevents inrush currents at startup. The pin-selectable switching frequency and PWM current-mode architecture allow excellent transient response, easy noise filtering, and the use of small, cost-saving external inductors and capacitors. The ADP1611 is offered in the Pb-free 8-lead MSOP and operates over the temperature range of −40°C to +85°C. APPLICATIONS TFT LC bias supplies Portable applications Industrial/instrumentation equipment FUNCTIONAL BLOCK DIAGRAM COMP 1 IN 6 REF FB 2 ERROR AMP gm BIAS ADP1611 F/F RAMP GEN COMPARATOR RT 7 SS 8 SD 3 OSC SOFT START CURRENTSENSE AMPLIFIER 4 5 SW R Q S DRIVER GND Figure 1. Rev. 0 Information furnished by Analog Devices is bel...