DATASHEET ISL91133 FN8680 Rev 1.00 High Efficiency 2.3A Boost Regulator with Input-to-Output Bypass Jul 12, 2018 The ISL91133 is an integrated boost switching regulator for Features battery powered applications. The device provides a power Input voltage range: 2.35V to 5.4V supply solution for products using a one cell Li-ion or Li-polymer battery. Output current: up to 2.3A (V = 2.5V, V = 3.3V) IN OUT The device is capable of delivering up to 2.3A output current Burst current up to 2.5A (V = 2.5V, V = 3.3V, IN OUT from V = 2.5V and V = 3.3V. The no load quiescent t < 600s, T = 4.6ms) IN OUT ON current is only 108A in Boost mode and 45A in Forced High efficiency: up to 96% Bypass mode, which significantly reduces the standby 108A quiescent current minimizes standby consumption in consumption. Boost mode, 45A in Forced Bypass mode The ISL91133 offers a Bypass mode operation where the 2.5MHz switching frequency minimizes external component output is directly connected to the input through a 38m size MOSFET to allow a significantly lower dropout voltage. The Forced Bypass or Auto Bypass modes with a 38m switch Bypass mode can be entered by an external command, or by auto bypass. The Forced Bypass mode allows the output PFM mode at light load currents voltage to operate close to the input voltage and improves the Fully protected for overcurrent, over-temperature, and efficiency under these conditions. undervoltage The ISL91133 is designed to support 6 fixed output voltages Load disconnect when disabled ranging from 3.15V to 5V. A voltage select pin is available for Small 1.78mmx1.78mm WLCSP each output variant to scale up the output voltage by a small offset to compensate the load transient droop. Applications The ISL91133 requires only an inductor and a few external components to operate. The 2.5MHz switching frequency Smartphones and tablet PCs further reduces the size of external components. Wireless communication devices The ISL91133 is available in a 16 bump, 0.4mm pitch, 2G/3G/4G RF power amplifiers 1.78mmx1.78mm WLCSP. USB OTG power source Related Literature For a full list of related documents, visit our website ISL91133 product page 100 98 V = IN L 4V 1 IN 96 2.35V TO 5.4V V = 3.3V TO V ISL91133IIMZ OUT IN 0.47H 94 UP TO 2.3A LX VOUT 92 3V IN C C 2 1 2.7V 90 IN 22F 2x22F 88 VIN 86 2.5V IN 84 AUTO BYPASS EN 82 BYPS R 1 FORCED BYPASS RESET 80 78 V HI OUT 76 PG VSEL V LO OUT 74 72 PGND GND 70 0.001 0.01 0.1 1 I (A) OUT FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY vs LOAD CURRENT, V = 3.3V OUT FN8680 Rev 1.00 Page 1 of 14 Jul 12, 2018 EFFICIENCY (%)ISL91133 Block Diagram Q3 A3 VIN A4 B3 VOUT B4 C3 LX C4 Q2 GATE DRIVERS AND ANTI D2 SHOOT-THRU Q1 D3 PGND D4 VIN MONITOR OSC THERMAL SHUTDOWN Vref EN A1 VOUT CONTROL CLAMP VSEL B1 CURRENT DETECT PG A2 VOUT ERROR AMP Ref COMP COMPENSATOR BYPS C1 B2 C2 D1 GND FIGURE 3. BLOCK DIAGRAM FN8680 Rev 1.00 Page 2 of 14 Jul 12, 2018