DATASHEET ISL8002, ISL8002A, ISL80019, ISL80019A FN7888 Rev 4.00 Compact Synchronous Buck Regulators July 31, 2014 The ISL8002, ISL8002A, ISL80019 and ISL80019A are highly Features efficient, monolithic, synchronous step-down DC/DC converters V range 2.7V to 5.5V that can deliver up to 2A of continuous output current from a 2.7V IN to 5.5V input supply. They use peak current mode control V range is 0.6V to V OUT IN architecture to allow very low duty cycle operation. They operate I maximum is 1.5A or 2A (see Table 1 on page 3) OUT at either 1MHz or 2MHz switching frequency, thereby providing Switching frequency is 1MHz or 2MHz (see Table 1 on page 3) superior transient response and allowing for the use of small inductors. They also have excellent stability and provide both Internal or external compensation option internal and external compensation options. Selectable PFM or PWM operation option The ISL8002, ISL8002A, ISL80019 and ISL80019A integrate Overcurrent and short circuit protection very low r MOSFETs in order to maximize efficiency. In DS(ON) addition, since the high-side MOSFET is a PMOS, the need for a Over-temperature/thermal protection Boot capacitor is eliminated, thereby reducing external V Undervoltage Lockout and V Overvoltage Protection IN OUT component count. They can operate at 100% duty cycle (at 1MHz) Up to 95% peak efficiency with a dropout of 200mV at 2A output current. These devices can be configured for either PFM (discontinuous Applications conduction) or PWM (continuous conduction) operation at light General purpose point of load DC/DC load. PFM provides high efficiency by reducing switching losses at light loads and PWM reduces noise susceptibility and RF Set-top boxes and cable modems interference. FPGA power These devices are offered in a space saving 8 pin 2mmx2mm DVD, HDD drives, LCD panels, TV TDFN lead free package with exposed pad for improved thermal performance. The complete converter occupies less than Related Literature 2 0.10in area. See AN1803, 1.5A/2A Low Quiescent Current High Efficiency Synchronous Buck Regulator ISL8002 L1 100 1.2 H +1.8V/2A +2.7V +5.5V 1 8 VIN PHASE VOUT VIN C1 C5 C6 22F 22 F 22 F 90 GND GND 2 7 EN PGND 80 R1 200k 1% EN 3 6 +0.6V MODE FB 70 R2 2.5V 100k 1% OUT 4 5 1.8V PG COMP OUT PG PAD 60 1.5V OUT 9 1.2V OUT 50 0.9V OUT 0.8V OUT V 40 O (EQ. 1) ------------ R = R 1 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 1 2 VFB OUTPUT LOAD (A) FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION FIGURE 2. EFFICIENCY vs LOAD (INTERNAL COMPENSATION OPTION) F = 1MHz, V = 3.3V, MODE = PFM, T = +25C SW IN A FN7888 Rev 4.00 Page 1 of 23 July 31, 2014 EFFICIENCY (%) ISL8002, ISL8002A, ISL80019, ISL80019A Table of Contents Pin Configuration 4 Pin Descriptions . 4 Functional Block Diagram 5 Absolute Maximum Ratings . 7 Thermal Information . 7 Recommended Operating Conditions 7 Electrical Specifications . 7 Typical Performance Curves 9 Theory of Operation . 17 PWM Control Scheme 17 PFM Mode 17 Overcurrent Protection . 18 Short-Circuit Protection . 18 Negative Current Protection . 18 PG 18 UVLO 18 Enable, Disable, and Soft-Start Up 18 Discharge Mode (Soft-Stop) . 18 100% Duty Cycle (1MHz Version) . 18 Thermal ShutDown 19 Power Derating Characteristics 19 Applications Information 19 Output Inductor and Capacitor Selection 19 Output Voltage Selection . 19 Input Capacitor Selection . 19 Output Capacitor Selection 19 Loop Compensation Design . 20 Layout Considerations 21 Revision History 22 About Intersil 22 Package Outline Drawing 23 FN7888 Rev 4.00 Page 2 of 23 July 31, 2014