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ISL9305IRTWCNLZ-T Datasheet(PDF) 1 Page - Intersil Corporation |
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ISL9305IRTWCNLZ-T Datasheet(HTML) 1 Page - Intersil Corporation |
1 / 17 page 1 3MHz Dual Step-Down Converters and Dual Low-Input LDOs with I2C Compatible Interface ISL9305 The ISL9305 is an integrated mini Power Management IC (mini-PMIC) ideal for applications of powering low-voltage microprocessor or multiple voltage rails with battery as input sources, such as a single Li-ion or Li-Polymer. ISL9305 integrates two high-efficiency 3MHz synchronous step-down converters (DCD1 and DCD2) and two low-input, low-dropout linear regulators (LDO1 and LDO2). The 3MHz PWM switching frequency allows the use of very small external inductors and capacitors. Both step-down converters can enter skip mode under light load conditions to further improve the efficiency and maximize the battery life. For noise sensitive applications, they can also be programmed through I2C interface to operate in forced PWM mode regardless of the load current condition. The I2C interface supports on-the-fly slew rate control of the output voltage from 0.825V to 3.6V at 25mV/step size for dynamic power saving. Each step-down converter can supply up to 800mA load current. The default output voltage can be set from 0.8V to VIN using external feedback resistors on the adjustable version, or the ISL9305 can be ordered in factory pre-set power-up default voltages in increments of 100mV from 0.9V to 3.6V. The ISL9305 also provides two 300mA low dropout (LDO) regulators. The input voltage range is 1.5V to 5.5V allowing them to be powered from one of the on-chip step-down converters or directly from the battery. The default LDO power-up output comes with factory pre-set fixed output voltage options between 0.9V to 3.3V. The ISL9305 is available in a 4mmx4mm 16 Ld TQFN package. Related Literature • FN7724, ISL9305H Data Sheet • AN1564 “ISL9305IRTZEVAL1Z and ISL9305HIRTZEVAL1Z Evaluation Boards” Features • Dual 800mA, Synchronous Step-down Converters and Dual 300mA, General-purpose LDOs • Input Voltage Range - DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3V to 5.5V - LDO1/LDO2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5V to 5.5V • 400kb/s I2C-bus Series Interface Transfers the Control Data Between the Host Controller and the ISL9305 • Adjustable Output Voltage - DCD1/DCD2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.8V to VIN -Fixed Output I2C Programmability • At 25mV/step. . . . . . . . . . . . . . . . . . . . . . . . . . . 0.825V to 3.6V •LDO1/LDO2 Output Voltage I2C Programmability - At 50mV/step. . . . . . . . . . . . . . . . . . . . . . . . . . . 0.9V to 3.3V •50μA IQ (Typ) with DCD1/DCD2 in Skip Mode; 20μA IQ (Typ) for each Enabled LDO •On-the-fly I2C Programming of DC/DC and LDO Output Voltages •DCD1/DCD2 I2C Programmable Skip Mode Under Light Load or Forced Fixed Switching Frequency PWM Mode • Small, Thin, 4mmx4mm TQFN Package Applications • Cellular Phones, Smart Phones • PDAs, Portable Media Players, Portable Instruments • Single Li-ion/Li-Polymer Battery-Powered Equipment •DSP Core Power FIGURE 1. TYPICAL APPLICATION DIAGRAM * * ISL9305 SDAT VINDCD1 VINLDO1 VINLDO2 L1 = 1.5µH SW1 FB1 SW2 FB2 VOLDO2 2.3V TO 5.5V 800mA L2 = 1.5µH 800mA 1.5V TO 5.5V 1.5V TO 5.5V GNDDCD1 300mA 300mA C3 R1 R2 R3 R4 GNDDCD2 SCLK VOLDO1 GNDLDO PG VINDCD2 *Only for adjustable output version. For fixed output version, directly connect the FB pin to the output of the buck converter. 1µF C2 1µF C10 10µF C7 1µF C6 1µF C5 4.7µF C4 4.7µF CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2010, 2011. All Rights Reserved 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. August 15, 2011 FN7605.1 |
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