DATASHEET ISL9307 FN7931 Rev 3.00 3MHz Dual 1500mA Step-Down Converters and Dual Low-Input LDOs September 20, 2012 The ISL9307 is an integrated mini Power Management IC Features (mini-PMIC) ideal for applications for powering low-voltage Dual 1500mA, Synchronous Step-down Converters and Dual microprocessor or multiple voltage rails with a battery as an 300mA, General-purpose LDOs input source, such as a single Li-ion or Li-polymer. ISL9307 integrates two high-efficiency, 3MHz, synchronous step-down Input Voltage Range converters (DCD1 and DCD2) and two low-input, low-dropout - DCD1/DCD2 2.5V to 5.5V linear regulators (LDO1 and LDO2). - VINLDO 1.5V to 5.5V The 3MHz PWM switching frequency allows the use of very Adjustable Output Voltage small external inductors and capacitors. Both step-down - VODCD1/VODCD2 0.8V to V IN converters can enter skip mode under light load conditions to 50A I (Typ) with DCD1/DCD2 in Skip Mode 20A I (Typ) further improve efficiency and maximize battery life. Q Q for each Enabled LDO The ISL9307 features EN pins for each channel, thus allowing EN Pins for DCD1/DCD2 and LDO1/LDO2 startup delay for power sequencing. Small, Thin, 4mmx4mm TQFN The ISL9307 also provides two 300mA low-dropout (LDO) regulators. The input voltage range is 1.5V to 5.5V, which Applications allows them to be powered from one of the on-chip step-down Cellular Phones, Smart Phones converters or directly from a battery. The default LDO power-up output comes with factory pre-set fixed output voltage options PDAs, Portable Media Players, Portable Instruments between 0.9V and 3.3V. Single Li-ion/Li-polymer Battery-Powered Equipment The ISL9307 is available in a 4mmx4mm 16 Ld TQFN. DSP Core Power L = 1.5H 1 2.5V TO 5.5V SW1 1500mA VINDCD1 VINDCD2 C 1 R C 1 4 10F FB1 R 2 10F ENDCD1 ENDCD2 L = 1.5H 2 SW2 1500mA ISL9307 C 5 R ENLDO1 3 FB2 10F R 4 ENLDO2 1.5V TO 5.5V VOLDO1 300mA VINLDO C 2 1F VOLDO2 300mA C C 6 7 GNDDCD1 GNDDCD2 GNDLDO 1F 1F NOTE: ONLY FOR ADJUSTABLE OUTPUT VERSION. FOR FIXED OUTPUT VERSION, DIRECTLY CONNECT THE FB PIN TO THE OUTPUT OF THE BUCK CONVERTER. FIGURE 1. TYPICAL APPLICATION DIAGRAM FN7931 Rev 3.00 Page 1 of 13 September 20, 2012ISL9307 TABLE 1. TYPICAL APPLICATION PART LIST PARTS DESCRIPTION MANUFACTURER PART NUMBER SPECIFICATIONS SIZE L1, L2 Inductor Sumida CDRH2D14NP-1R5 1.5H/1.80A/50m 3.0mmx3.0mmx1.55mm C1 Input capacitor Murata GRM21BR60J106KE19L 10F/6.3V 0805 C2, C3 Input capacitor Murata GRM185R60J105KE26D 1F/6.3V 0603 C4, C5 Output capacitor Murata GRM21BR60J106KE19L 4.7F/6.3V 0805 C6, C7 Output capacitor Murata GRM185R60J105KE26D 10F/6.3V 0603 R1, R2, Resistor Various 1%, SMD, 0.1 0603 R3, R4 Block Diagram ANALOG/LOGIC SHORT CIRCUIT INPUT VINDCD1 CIRCUIT 10F PROTECTION 1.5H SW1 ENDCD1 DCD1 4.7F FB1 BUCK CONVERTER GNDDCD1 OVER- VINDCD2 CURRENT 10F 1.5H PROTECTION SW2 DCD2 4.7F FB2 BUCK GNDDCD2 CONVERTER ENDCD2 VINLDO THERMAL 1F SHUTDOWN VOLDO1 LDO1 300mA 1F ENLDO1 LDO2 VOLDO2 300mA ENLDO2 1F GNDLDO FN7931 Rev 3.00 Page 2 of 13 September 20, 2012