DATASHEET ISL8013A FN7526 Rev 2.00 3A Low Quiescent Current 1MHz High Efficiency Synchronous Buck Regulator November 17, 2014 The ISL8013A is a high efficiency, monolithic, synchronous Features step-down DC/DC converter that can deliver up to 3A High efficiency synchronous buck regulator with up to 97% continuous output current from a 2.8V to 5.5V input supply. It efficiency uses a current control architecture to deliver very low duty cycle operation at high frequency with fast transient response Power-good (PG) output with a 1ms delay and excellent loop stability. 2.8V to 5.5V supply voltage The ISL8013A integrates a pair of low ON-resistance 3% output accuracy over temperature, load, line P-Channel and N-Channel internal MOSFETs to maximize 3A output current efficiency and minimize external component count. The 100% Start-up with prebiased output duty-cycle operation allows less than 300mV dropout voltage at 3A output current. High 1MHz pulse-width modulation Internal soft-start - 1ms (PWM) switching frequency allows for the use of small external Soft-stop output discharge during disable components and the SYNC input enables multiple ICs to 35A quiescent supply current in PFM mode synchronize out-of-phase to reduce ripple and eliminate beat frequencies. Selectable forced PWM mode and PFM mode External synchronization up to 4MHz The ISL8013A can be configured for discontinuous or forced continuous operation at light load. Forced continuous Less than 1A logic controlled shutdown current operation reduces noise and RF interference while 100% maximum duty cycle discontinuous mode provides high efficiency by reducing Internal current mode compensation switching losses at light loads. Peak current limiting and hiccup mode short-circuit Fault protection is provided by internal hiccup mode current protection limiting during short circuit and overcurrent conditions, an Over-temperature protection output overvoltage comparator and over-temperature monitor circuit. A power-good output voltage monitor indicates when Small 16 Ld 4mmx4mm QFN the output is in regulation. Pb-Free (RoHS compliant) The ISL8013A is offered in a space saving 4mmx4mm, Pb-free QFN package with exposed pad leadframes for low thermal Applications resistance. DC/DC POL modules The ISL8013A includes a pair of low ON-resistance P-Channel C/P, FPGA and DSP power and N-Channel internal MOSFETs to maximize efficiency and Plug-in DC/DC modules for routers and switchers minimize external component count. The 100% duty-cycle Portable instruments operation allows less than 300mV dropout voltage at 3A. Test and measurement systems The ISL8013A offers a 1ms Power-Good (PG) timer at power-up. When shut down, ISL8013A discharges the output Li-ion battery powered devices capacitor. Other features include internal soft-start, internal Small form factor (SFP) modules compensation, overcurrent protection, and thermal shutdown. Barcode readers The ISL8013A is offered in a 4mmx4mm 16 Ld QFN package with 1mm maximum height. The complete converter occupies 2 less than 0.4in area. FN7526 Rev 2.00 Page 1 of 16 November 17, 2014ISL8013A Ordering Information PART NUMBER PART TEMP. RANGE PACKAGE PKG. (Notes 1, 2, 3) MARKING (C) (Pb-Free) DWG. ISL8013AIRZ 80 13AIRZ -40 to +85 16 Ld 4x4 QFN L16.4x4 ISL8013AEVAL2Z Evaluation Board 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 ISL8013A. For more information on MSL please see techbrief TB363. Pin Configuration ISL8013A (16 LD QFN) TOP VIEW 16 15 14 13 VIN 1 12 PGND VIN 2 11 PGND PAD VDD 3 10 SGND SYNCH 4 9 SGND 576 8 REFER TO APPLICATION NOTE AN1365 FOR MORE LAYOUT SUGGESTIONS. 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. Enable the output when driven to high. Shut down the chip and discharge output capacitor when driven to low. Do not leave this pin floating. 7 1ms timer output. At power-up or EN HI, this output is a 1ms delayed power-good signal for the output PG 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. 13, 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, 16 NC No connect - Exposed Pad The exposed pad must be connected to the SGND pin for proper electrical performance. Place as many vias as possible under the pad connecting to SGND plane for optimal thermal performance. FN7526 Rev 2.00 Page 2 of 16 November 17, 2014 EN NC NC LX LX PG LX VFB