DATASHEET ISL91107 FN8584 Rev 3.00 High Efficiency Buck-Boost Regulator with 3.6A Switches May 3, 2018 The ISL91107 is a highly-integrated buck-boost switching Features regulator that accepts input voltages either above or below the Accepts input voltages above or below regulated output regulated output voltage. Unlike other buck-boost regulators, voltage this regulator automatically transitions between operating modes without significant output disturbance. Automatic and seamless transitions between Buck and Boost modes This device is capable of delivering up to 2A of output current (PVIN = 2.8V, V = 3.3V) and provides excellent efficiency Input voltage range: 1.8V to 5.5V OUT due to its fully synchronous 4-switch architecture. No-load Output current: up to 2A (PVIN = 2.8V, V = 3.3V) OUT quiescent current of only 45A also optimizes efficiency under High efficiency: up to 96% light-load conditions. 45A quiescent current maximizes light-load efficiency The ISL91107 is designed for standalone applications and 2.5MHz switching frequency minimizes external component supports 3.3V fixed output voltages or variable output voltages size with an external resistor divider. Output voltages as low as 1V or as high as 5.2V are supported using an external resistor Selectable forced PWM mode divider. Fully protected for short-circuit, over-temperature and The ISL91107 requires only a single inductor and very few undervoltage external components. Power supply solution size is minimized Small 2.15mmx1.51mm WLCSP by a 2.15mmx1.51mm WLCSP and a 2.5MHz switching frequency, which further reduces the size of external Applications components. Smartphones and tablet PCs Related Literature Wireless communication devices For a full list of related documents, visit our website 2G/3G/4G power amplifiers ISL91107 product page 100 V = 3.3V V = 3.8V IN V = IN IN ISL91107IIAZ 1.8V TO 5.5V V = 4.2V IN 95 PVIN LX1 C 1 L 1 90 22F 1H VIN LX2 V = 3.3V OUT 85 MODE VOUT V = 2.5V IN C R 4 1 EN 22pF 187k 80 C 2 FB 2x22F R 2 75 60.4k GND PGND 70 1 10 100 1000 LOAD CURRENT (mA) FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY vs OUTPUT CURRENT (V =3.3V) OUT FN8584 Rev 3.00 Page 1 of 14 May 3, 2018 EFFICIENCY (%)ISL91107 Block Diagram LX1 LX2 B2 B1 D1 D2 A1 E1 PVIN VOUT A2 E2 SOFT DISCHARGE GATE DRIVERS AND ANTI- SHOOTTHRU EN EN B3 EN EN C1 PGND VIN A3 VREF C2 PVIN MONITOR VOUT CLAMP THERMAL SHUTDOWN PWM CONTROL CURRENT MODE C3 DETECT EN VOUT EN MONITOR FB E3 OSC EN REF ERROR AMP VOLTAGE PROG. D3 GND Pin Configuration Pin Descriptions ISL91107 PIN PIN NAMES DESCRIPTION (15 BUMP WLCSP) TOP VIEW A1, A2 PVIN Power input. Range: 1.8V to 5.5V. Connect 22F capacitor to PGND. 12 3 A3 VIN Supply input. Range: 1.8V to 5.5V. B1, B2 LX1 Inductor connection, input side. A PVIN PVIN VIN B3 EN Logic input for enable. Drive HIGH to enable device, LOW to disable. B LX1 LX1 EN C1, C2 PGND Power ground for high switching current. C C3 MODE PGND PGND MODE Logic input, HIGH for auto PFM mode. LOW for forced PWM operation. D LX2 LX2 GND D1, D2 LX2 Inductor connection, output side. D3 GND Analog ground pin E VOUT VOUT FB E1, E2 VOUT Buck-boost output. Connect 2x22F capacitor to PGND. E3 FB Voltage feedback pin FN8584 Rev 3.00 Page 2 of 14 May 3, 2018 REVERSE CURRENT