High Efficiency Synchronous Boost Converter with 4.2A Switches and Output Disconnect ISL91117 Features Input voltage range: 1.8V to 4.8V The ISL91117 is a highly-integrated boost switching regulator for battery powered applications. The device provides a power Fixed 5V or adjustable output supply solution for products using dual-cell or three-cell Output current: up to 1.5A (PVIN = 3.3V, VOUT = 5V) alkaline, NiCd or NiMH, or one-cell Li-ion or Li-polymer battery. High efficiency: up to 96% This device is capable of delivering an output current of 1.5A 35A quiescent current maximizes light-load efficiency with PVIN = 3.3V and VOUT = 5V. The use of a synchronous rectifier maximizes efficiency at high loads. No-load quiescent True input-output disconnect when disabled current of only 35A optimizes efficiency under light-load 2.6MHz switching frequency minimizes external component conditions. Forced PWM and/or synchronization to an external size clock may also be selected for noise sensitive applications. Selectable forced-PWM mode and external synchronization The ISL91117 is designed for standalone applications and Fully protected for short-circuit, over-temperature and supports 5V fixed output voltage or variable output voltages undervoltage with an external resistor divider. Power supply solution size is minimized by a 2.34mm x 1.72mm WLCSP and a 2.6MHz Small 2.34mm x 1.72mm WLCSP switching frequency, which allows for the use of tiny, low-profile inductors and ceramic capacitors to minimize the Applications size of the solution. Smart phones and tablets Related Literature Wireless communication devices Products including portable HDMI and USB-OTG AN1918, ISL91117II7-EVZ, ISL91117IIA-EVZ Evaluation Boards L1 1H 100 VIN = 4.2V 95 90 VIN = 1.8V TO 4.8V BLKG 85 VIN = 3.6V PVIN 80 VOUT = 5V VIN = 3.0V C1 22F VOUT 75 VIN = 2.7V ISL91117 VIN 70 C2 EN FB 2x22F 65 MODE 60 55 50 0.1 1 10 100 1000 LOAD CURRENT (mA) FIGURE 1. TYPICAL FIXED OUTPUT APPLICATION FIGURE 2. EFFICIENCY vs LOAD CURRENT (VOUT = 5V) March 7, 2014 CAUTION: These devices are sensitive to electrostatic discharge follow proper IC Handling Procedures. 1 1-888-INTERSIL or 1-888-468-3774 Copyright Intersil Americas LLC 2014. All Rights Reserved FN8569.3 Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries. All other trademarks mentioned are the property of their respective owners. LX GND PGND EFFICIENCY (%)ISL91117 Block Diagram BLKG LX A2 B2 C2 A4 B4 C4 A1 A5 PVIN B1 B5 VOUT Blocking FET C1 C5 SOFT GATE DISCHARGE DRIVERS & ANTI- EN SHOOT THRU EN D2 A3 EN PGND B3 VIN V D1 REF C3 PVIN MONITOR VOUT CLAMP THERMAL SHUTDOWN PWM CURRENT CONTROL MODE D3 DETECT EN VOUT EN MONITOR OSC D5 FB EN PWM REF COMP ERROR AMP VOLTAGE PROG. D4 GND Pin Configuration Pin Descriptions ISL91117 PIN (4x5 WLCSP) PIN NAMES DESCRIPTION TOP VIEW A5, B5, C5 VOUT Boost output. Connect 2x22F capacitor to PGND. A1 B1 C1 D1 A4, B4, C4 LX Switching node of the boost converter. A2 B2 C2 D2 A3, B3, C3 PGND Power ground for high switching current. A3 B3 C3 D3 A2, B2, C2 BLKG Blocking FET terminal. Connect the input side of the inductor. A4 B4 C4 D4 A1, B1, C1 PVIN Power input. Range: 1.8V to 4.8V. Connect a 22F A5 B5 C5 D5 capacitor to PGND. D1 VIN Supply input. Range: 1.8V to 4.8V. D2 EN Logic input, drive HIGH to enable device. D3 MODE Logic input, HIGH for auto PFM mode. LOW for forced PWM operation. Also, this pin can be used with an external clock sync input. Range: 2.75MHz to 3.25MHz. Maximum voltage on this pin should be limited to VIN. D4 GND Analog ground pin. D5 FB Voltage feedback pin. Submit Document Feedback FN8569.3 2 March 7, 2014 REVERSE CURRENT