DATASHEET ISL8002B FN8690 Rev 3.00 Compact Synchronous Buck Regulator October 28, 2016 The ISL8002B is a highly efficient, monolithic, synchronous Features step-down DC/DC converter that can deliver up to 2A of V range 2.7V to 5.5V continuous output current from a 2.7V to 5.5V input supply. It IN uses peak current mode control architecture to allow very low I maximum is 2A OUT duty cycle operation. ISL8002B operates at a 2MHz switching External soft-start programmable frequency, thereby providing superior transient response and Output tracking and sequencing allowing for the use of a small inductor. ISL8002B also has excellent stability. Switching frequency is 2MHz The ISL8002B integrates very low r MOSFETs in order to Selectable PFM or PWM operation option DS(ON) maximize efficiency. In addition, since the high-side MOSFET is a Overcurrent and short-circuit protection PMOS, the need for a boot capacitor is eliminated, thereby Over-temperature/thermal protection reducing external component count. V undervoltage lockout and V overvoltage protection IN OUT The device can be configured for either PFM (discontinuous conduction) or PWM (continuous conduction) operation at light Up to 95% peak efficiency load. PFM provides high efficiency by reducing switching losses at light loads and PWM for fast transient response, Applications which helps reduce the output noise and RF interference. General purpose POL The device is offered in a space saving 8 Ld 2mmx2mm TDFN Industrial, instrumentation and medical equipment Pb-free package with exposed pad for improved thermal FPGAs performance. The complete converter occupies less than 2 Telecom and networking equipment 64mm area. Game console Related Literature For a full list of related documents, visit our website - ISL8002B product page ISL8002B L1 +1.8V/2A +2.7V +5.5V 1 8 100 VIN PHASE VOUT VIN C1 C2 2.5V OUT 3x10F 22F GND GND C3 2 7 90 PGND EN 4.7pF R1 200k 1% EN 3 6 80 MODE FB 0.6V R2 1.8V OUT 100k 1% 1.5V OUT 70 4 5 1.2V PG SS/TR PG PAD OUT R3 200k 1% TRACK 9 0.9V 60 OUT R4 100k 1% 0.8V OUT 50 V O 40 R = R ------------ 1 (EQ. 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 (INTERNAL FIGURE 2. EFFICIENCY vs LOAD (f = 2MHz, V = 3.3V), SW IN COMPENSATION OPTION) MODE = PFM, T = +25C A FN8690 Rev 3.00 Page 1 of 22 October 28, 2016 EFFICIENCY (%) ISL8002B Table of Contents Ordering Information 3 Pin Configuration 4 Pin Descriptions . 4 Functional Block Diagram 5 Absolute Maximum Ratings . 6 Thermal Information . 6 Recommended Operating Conditions 6 Electrical Specifications . 6 Typical Performance Curves 7 Theory of Operation . 16 PWM Control Scheme 16 PFM Mode 17 Overcurrent Protection . 17 Short-Circuit Protection . 17 Negative Current Protection . 17 PG 17 UVLO 17 Enable, Disable and Soft Start-Up 17 Output Tracking and Sequencing . 18 Discharge Mode (Soft-Stop) . 19 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 20 Layout Considerations 20 Revision History 21 About Intersil 21 Package Outline Drawing 22 FN8690 Rev 3.00 Page 2 of 22 October 28, 2016