DATASHEET ISL8014 FN6576 Rev 4.00 4A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator November 23, 2009 The ISL8014 is a high efficiency, monolithic, Features synchronous step-down DC/DC converter that can High Efficiency Synchronous Buck Regulator with deliver up to 4A continuous output current from a 2.7V up to 97% Efficiency to 5.5V input supply. It uses a current control architecture to deliver very low duty cycle operation at Power-Good (PG) Output with a 1ms Delay high frequency with fast transient response and 2.7V to 5.5V Supply Voltage excellent loop stability. 3% Output Accuracy Over-Temperature/Load/Line The ISL8014 integrates a pair of low ON-resistance 4A Output Current P-Channel and N-Channel internal MOSFETs to Pin Compatible to ISL8013 maximize efficiency and minimize external component Start-up with Pre-Biased Output count. The 100% duty-cycle operation allows less than Internal Soft-Start - 1ms 400mV dropout voltage at 4A output current. High 1MHz pulse-width modulation (PWM) switching Soft-Stop Output Discharge During Disabled frequency allows the use of small external components 35A Quiescent Supply Current in PFM Mode and SYNC input enables multiple ICs to synchronize Selectable Forced PWM Mode and PFM Mode out of phase to reduce ripple and eliminate beat External Synchronization up to 4MHz frequencies. Less than 1A Logic Controlled Shutdown Current The ISL8014 can be configured for discontinuous or 100% Maximum Duty Cycle forced continuous operation at light load. Forced continuous operation reduces noise and RF Internal Current Mode Compensation interference while discontinuous mode provides high Peak Current Limiting and Hiccup Mode Short efficiency by reducing switching losses at light loads. Circuit Protection Over-Temperature Protection Fault protection is provided by internal hiccup mode current limiting during short circuit and overcurrent Small 16 Ld 4mmx4mm QFN conditions, an output over voltage comparator and Pb-Free (RoHS Compliant) over-temperature monitor circuit. A power good output voltage monitor indicates when the output is in Applications regulation. DC/DC POL Modules The ISL8014 is offered in a space saving 4x4 QFN lead C/P, FPGA and DSP Power free package with exposed pad lead frames for low Plug-in DC/DC Modules for Routers and Switchers thermal. Portable Instruments The ISL8014 offers a 1ms Power-Good (PG) timer at Test and Measurement Systems power-up. When shutdown, ISL8014 discharges the Li-ion Battery Powered Devices output capacitor. Other features include internal soft-start, internal compensation, overcurrent Small Form Factor (SFP) Modules protection, and thermal shutdown. Bar Code Readers The ISL8014 is offered in a 16 Ld 4mmx4mm QFN package with 1mm maximum height. The complete 2 converter occupies less than 0.4in area. FN6576 Rev 4.00 Page 1 of 17 November 23, 2009 NOT RECOMMENDED FOR NEW DESIGNS RECOMMENDED REPLACEMENT PART ISL8014AISL8014 Ordering Information TEMP. PART NUMBER PART RANGE PACKAGE PKG. (Notes 1, 2, 3) MARKING (C) (Pb-Free) DWG. ISL8014IRZ 80 14IRZ -40 to +85 16 Ld 4x4 QFN L16.4x4 NOTES: 1. Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL8014. For more information on MSL please see techbrief TB363. Pin Configuration ISL8014 (16 LD QFN) TOP VIEW 16 15 14 13 VIN 1 12 PGND VIN 2 11 PGND VDD 3 10 SGND SYNCH 4 9 SGND 576 8 Pin Descriptions PIN NUMBER PIN NAME DESCRIPTION 1, 2 VIN Input supply voltage. Connect a 10F ceramic capacitor to power ground. 3 VDD Input supply voltage for the analog circuitry. Connect to VIN pin. 5 EN Regulator enable pin. Keep the EN voltage low in disabled state until VIN settles or is above 2.5V. Enable the output when driven to high. Shut down the chip and discharge output capacitor when driven to low. Do not connect directly to VIN or leave this pin floating. 7 PG 1ms timer output. At power-up or EN HI, this output is a 1ms delayed Power-Good signal for the output voltage. 4 SYNCH Mode Selection pin. Connect to logic high or input voltage VDD for PWM mode. Connect to logic low or ground for PFM mode. Connect to an external function generator for synchronization with the negative edge trigger. Do not leave this pin floating. 14, 15 LX Switching node connection. Connect to one terminal of the inductor. 11, 12 PGND Power ground 9, 10 SGND Signal ground. 8 VFB Buck regulator output feedback. Connect to the output through a resistor divider for adjustable output voltage. For 0.8V output voltage, connect this pin to the output. 6, 13, 16 NC No connect. - Exposed Pad The exposed pad must be connected to the SGND pin for proper electrical performance. Place as much vias as possible under the pad connecting to SGND plane for optimal thermal performance. FN6576 Rev 4.00 Page 2 of 17 November 23, 2009 NC EN LX NC PG LX VFB NC