DATASHEET ISL80030, ISL80030A, ISL80031, ISL80031A FN8766 Rev.2.00 3A Synchronous Buck Converter in 2x2 DFN Package Nov 16, 2017 The ISL80030, ISL80030A, ISL80031, and ISL80031A are highly Features efficient, monolithic, synchronous step-down DC/DC converters V range 2.7V to 5.5V that can deliver up to 3A of continuous output current from a 2.7V IN to 5.5V input supply. They use peak current mode control Up to 3A of output current architecture to allow very low duty cycle operation. These devices Switching frequency of 1MHz or 2MHz (see Table 1 on page 3) operate at either a 1MHz or 2MHz switching frequency, thereby 35A quiescent current (ISL80031 and ISL80031A) providing superior transient response and allowing for the use of small inductors. They also have excellent stability. Overcurrent and short-circuit protection The ISL80030, ISL80030A, ISL80031, and ISL80031A integrate Over-temperature/thermal protection very low r MOSFETs to maximize efficiency. In addition, DS(ON) Negative current protection because the high-side MOSFET is a PMOS, the need for a Boot capacitor is eliminated, thereby reducing external component Power-good and enable count. The devices can operate at 100% duty cycle. 100% duty cycle The ISL80030 and ISL80030A are configured for PWM pulse Internal soft-start and soft-stop width modulation operation and provide a fast transient V undervoltage lockout and V overvoltage protection IN OUT response, which helps reduce the output noise and RF interference. Up to 95% peak efficiency The ISL80031 and ISL80031A are configured for PFM Applications discontinuous conduction operation and provide high efficiency by reducing switching losses at light loads. General purpose POL Industrial, instrumentation, and medical equipment These devices are offered in a space saving 8 Ld 2mmx2mm DFN Pb-free package with exposed pad for improved thermal Telecom and networking equipment performance. The complete converter occupies an area less Game consoles 2 than 64mm . Related Literature For a full list of related documents, visit our website - ISL80030, ISL80030A, ISL80031, ISL80031A product pages 100 ISL80030/ISL80031 V = 3.3V OUT L +2.7 TO +5.5V 1 +1.8V/3A 1 8 VIN VIN PHASE VOUT 93 C 2 C 1 22F 22F GND GND 2 7 87 VIN PGND EPAD C 3 3 22pF 6 80 EN EN PGND V = 1.8V R 1 OUT 200k 1% 73 4 5 PG PG FB 0.6V R 2 V = 2.5V OUT 100k 1% 9 67 V 60 O (EQ. 1) 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 ------------ R = R 1 1 2 VFB LOAD (A) FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION FIGURE 2. EFFICIENCY vs LOAD, ISL80031, V = 5V, T = +25C IN A FN8766 Rev.2.00 Page 1 of 20 Nov 16, 2017 EFFICIENCY (%)ISL80030, ISL80030A, ISL80031, ISL80031A Table of Contents Pin Configuration 4 Pin Descriptions . 4 Functional Block Diagram 5 Ordering Information 6 Absolute Maximum Ratings . 7 Thermal Information . 7 Recommended Operating Conditions 7 Electrical Specifications . 7 Typical Performance Curves 9 Theory of Operation . 15 PWM Control Scheme 15 PFM Operation 15 Overcurrent Protection . 16 Short-Circuit Protection . 16 Negative Current Protection . 16 PG 16 UVLO 16 Enable, Disable and Soft-Start Up 16 Discharge Mode (Soft-Stop) . 16 100% Duty Cycle 17 Power Derating Characteristics 17 Output Inductor and Capacitor Selection 17 Output Voltage Selection . 17 Input Capacitor Selection . 18 Layout Considerations 18 Revision History 19 About Intersil 19 Package Outline Drawing 20 FN8766 Rev.2.00 Page 2 of 20 Nov 16, 2017