DATASHEET ISL9111, ISL9111A FN7602 Rev.4.00 Low Input Voltage, High Efficiency Synchronous Boost Converter with 1A Switch Jun 4, 2012 The ISL9111 and ISL9111A provide a power supply solution Features for single-cell, dual-cell, or three-cell alkaline, NiCd or NiMH Up to 97% Efficiency at Typical Operating Conditions battery-powered applications. The device has a typical 0.8V start-up voltage and is capable of supplying up to 5.25V output Minimum Start-up Voltage voltage. Both devices are guaranteed to supply 100mA from a - 0.8V (ISL9111) single-cell input and 240mA from a dual-cell input when - 0.6V (ISL9111A) output is 3.3V. High 1.2MHz switching frequency allows for the use of tiny, low-profile inductors and ceramic capacitors to Minimum Operating Voltage minimize the size of the solution. - 0.7V (ISL9111) The ISL9111 and ISL9111A are internally compensated, fully - 0.5V (ISL9111A) integrated synchronous boost converters optimized for Low Quiescent Current: 20A (Typical) efficiency with minimal external components. At light load, the device enters skip mode and consumes only 20A of At V = 3.3V OUT quiescent current, resulting in higher efficiency at light loads - 100mA Output Current V = 0.9V IN and maximum battery life. - 240mA Output from V = 1.8V IN The ISL9111 and ISL9111A address both rechargeable and Logic Control Shutdown (Iq < 1A) non-rechargeable battery applications. The ISL9111 has a Output Voltage Up to 5.25V UVLO feature, which will internally shut off at 0.7V protecting a rechargeable battery. The ISL9111A has this feature disabled Output Disconnect During Shutdown to maximize the usable life of a non-rechargeable single cell Skip Mode Under Light Load Condition battery. The parts are available in fixed 3.0V, 3.3V and 5.0V output voltage versions or an adjustable output voltage version Undervoltage Lockout (ISL9111 Only) (ADJ). The fixed output voltage version also provides a FAULT Fault Protection: OVP (ADJ Version Only), OTP, Short Circuit pin for fault condition monitoring. The ISL9111 and ISL9111A 6 Ld SOT-23 Package are available in a 6 Ld SOT-23 package. Applications Products Including Portable HDMI and USB-OTG Personal Medical Products Wireless Mouse/Keyboard Bluetooth Headsets MP3/MP4 Players/DSC Single-cell, Dual-cell and Triple-cell Alkaline, NiCd, NiMH Powered Products 100 4.7H V = 3.6V IN 95 90 1 85 VOUT SW 5 VOUT 80 VIN 6 VIN 4.7F 75 4.7F 3 V = 0.9V IN V = 1.8V EN 70 IN 65 V 1k 2 FLT 4 GND FAULT 60 55 ISL9111: 3.0/3.3/5.0V, ISL9111A: 3.0/3.3/5.0V 50 0.1 1 10 100 1000 I (mA) OUT FIGURE 1. TYPICAL APPLICATION FIGURE 2. FIXED 5V EFFICIENCY FN7602 Rev.4.00 Page 1 of 15 Jun 4, 2012 EFFICIENCY (%) ISL9111, ISL9111A Block Diagram: ISL9111-ADJ, ISL9111A-ADJ C1 V OUT V IN C2 6 5 V VOLTAGE INT UVLO SELECTOR START-UP N-WELL SWITCH SW GATE L1 DRIVER 1 V OUT OVP AND ANTI-CROSS CONDUCTION SW ZCD EN 3 V OUT OFF ON CURRENT CONTROL LOGIC SENSE R1 DIGITAL AND SOFT-START CURRENT SLOPE COMP LIMIT FB 4 FAULT MONITORING g m VOLTAGE R2 CLAMP REFERENCE 1.2MHz THERMAL OSCILLATOR SHUTDOWN GENERATOR 2 FN7602 Rev.4.00 Page 2 of 15 Jun 4, 2012 V INT