DATASHEET ISL9110A FN8299 Rev 1.00 1.2A High Efficiency Buck-Boost Regulator June 8, 2012 The ISL9110A 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 part is capable of delivering up to 1.2A output current, Input Voltage Range: 1.8V to 5.5V and provides excellent efficiency due to its fully synchronous 4-switch architecture. No-load quiescent current of only 35A Output Current: Up to 1.2A also optimizes efficiency under light-load conditions. Forced High Efficiency: Up to 95% PWM and/or synchronization to an external clock may also be selected for noise sensitive applications. 35A Quiescent Current Maximizes Light-load Efficiency 2.5MHz Switching Frequency Minimizes External The ISL9110A is designed for standalone applications and Component Size supports 3.3V and 5V fixed output voltages or variable output voltages with an external resistor divider. Output voltages as Selectable Forced-PWM Mode and External Synchronization low as 1V, or as high as 5.2V are supported using an external Fully Protected for Overcurrent, Over-temperature and resistor divider. Undervoltage The ISL9110A requires only a single inductor and very few Small 2.4mmx1.6mm WLCSP Package external components. Power supply solution size is minimized by a 2.4mm x 1.6mm WLCSP package and a 2.5MHz Applications switching frequency, which further reduces the size of external components. Regulated 3.3V from a Single Li-Ion Battery Smart Phones and Tablet Computers Handheld Devices Point-of-Load Regulators Related Literature See AN1750 ISL9110A Evaluation Board User Guide 100 ISL9110AIITNZ V = 1.8V TO 5.5V IN A1 95 LX1 B1 PVIN C1 L1 10F 90 2.2H C1 V = 5V IN VIN LX2 D3 85 MODE A5 C2 V = 3.3V/1A OUT EN VOUT B5 D2 80 V = 3V IN BAT V = 2.5V STATUS IN C2 D1 D5 OUTPUTS PG FB 10F 75 GND PGND V = 3.3V OUT 70 0.01 0.05 0.25 1.25 I (A) OUT FIGURE 1. TYPICAL APPLICATION FIGURE 2. EFFICIENCY FN8299 Rev 1.00 Page 1 of 16 June 8, 2012 A2 B2 A4 B4 C5 D4 A3 B3 C3 C4 EFFICIENCY (%)ISL9110A Block Diagram LX1 LX2 A2 B2 A4 B4 A1 A5 PVIN VOUT B1 B5 SOFT GATE EN C2 EN DISCHARGE DRIVERS & ANTI- EN VIN C1 V REF SHOOT THRU EN A3 PGND D2 BAT B3 C3 PVIN C4 MONITOR VOUT CLAMP THERMAL SHUTDOWN PWM CURRENT CONTROL MODE/SYNC D3 DETECT EN D1 PG VOUT EN MONITOR D5 FB OSC EN REF ERROR AMP VOLTAGE PROG. C5 D4 GND Pin Configurations Pin Descriptions ISL9110A PIN (20 BALL WLCSP) PIN NAMES DESCRIPTION TOP VIEW A5, B5 VOUT Buck/boost output. Connect a 10F capacitor to A1 B1 C1 D1 PGND. A4, B4 LX2 Inductor connection, output side. A2 B2 C2 D2 A3, B3, PGND Power ground for high switching current. C3, C4 A3 B3 C3 D3 A2, B2 LX1 Inductor connection, input side. A4 B4 C4 D4 A1, B1 PVIN Power input. Range: 1.8V to 5.5V. Connect a 10F capacitor to PGND. A5 B5 C5 D5 C1 VIN Supply input. Range: 1.8V to 5.5V. D1 PG Open drain output. Provides output-power-good status. D2 BAT Open drain output. Provides input-power-good status. C2 EN Logic input, drive high to enable device. D3 MODE/ Logic input, high for auto PFM mode. Low for forced SYNC PWM operation. Ext. clock sync input. Range: 2.75MHz to 3.25MHz. C5, D4 GND Analog ground pin. D5 FB Voltage feedback pin. FN8299 Rev 1.00 Page 2 of 16 June 8, 2012 REVERSE CURRENT