DATASHEET ISL85014 FN8925 Rev.1.00 14A, 3.8V to 18V Input, Synchronous Buck Regulator Mar 17, 2017 The ISL85014 is a highly efficient, monolithic, synchronous Features buck regulator that can deliver 14A of continuous output Power input voltage range variable 3.8V to 18V current from a 3.8V to 18V input supply. The device uses current mode control architecture with a fast transient PWM output voltage adjustable from 0.6V response and excellent loop stability. Up to 14A output load The ISL85014 integrates very low ON-resistance high-side and Prebias start-up, fixed 3ms soft-start low-side FETs to maximize efficiency and minimize external Selectable f of 300kHz, 600kHz, and external SW component count. The minimum BOM and easy layout synchronization up to 1MHz footprint are extremely friendly to space constraint systems. Peak current mode control The operation frequency of this device can be set using the - DCM/CCM FREQ pin: 600kHz (FREQ = float) and 300kHz (FREQ = GND). - Thermally compensated current limit The device can also be synchronized to an external clock up to 1MHz. - Internal/external compensation Both high-side and low-side MOSFET current limit, along with Open-drain PG window comparator reverse current limit, fully protects the regulator in an Output overvoltage and thermal protection overcurrent event. Selectable OCP schemes can fit various Input overvoltage protection applications. Other protections, such as input/output overvoltage and over-temperature, are also integrated into the Integrated boot diode with undervoltage detection device and provide required system level safety in the event of Selectable OCP schemes fault conditions. -Hiccup OCP The ISL85014 is offered in a space saving 15 Ld 3.5mmx3.5mm -Latch-off Pb-free TQFN package with great thermal performance and Compact size 3.5mmx3.5mm, 15 Ld TQFN 0.8mm maximum height. Applications Related Literature Servers and cloud infrastructure POLs For a full list of related documents, visit our website - ISL85014 product page IPCs, factory automation, PLCs Telecom and networking systems Storage systems Test measurement R 2 C 1 C VIN 100 R 3 90 R 1 80 15 14 13 12 11 10 VIN EN DNC DNC COMP FB V IN PVIN 9 70 L 1 V OUT 4.5-18V PHASE 8 C 60 IN GND 7 C 50 OUT SYNC MODE FREQ PG VDD BOOT Vout = 5.0V, fsw = 600kHz 12 3 4 5 6 40 Vout = 3.3V, fsw = 600kHz 30 C VDD C 02 46 8 10 12 14 BOOT 2.2F 100nF OUTPUT CURRENT (A) FIGURE 1. TYPICAL APPLICATION SCHEMATIC FOR INTERNAL FIGURE 2. EFFICIENCY (V = 12V) IN COMPENSATION FN8925 Rev.1.00 Page 1 of 21 Mar 17, 2017 EFFICIENCY (%)ISL85014 Typical Application Schematic C 1 C 2 C VIN R 3 R 1 R 2 15 14 13 12 11 10 VIN EN DNC DNC COMP FB V IN PVIN 9 V L OUT 4.5 TO 18V 1 PHASE 8 C IN GND 7 C OUT SYNC MODE FREQ PG VDD BOOT 12 3 4 5 6 C VDD C BOOT 2.2F 100nF FIGURE 3. TYPICAL APPLICATION SCHEMATIC FOR EXTERNAL COMPENSATION TABLE 1. DESIGN TABLE FOR DIFFERENT OUTPUT VOLTAGE USING INTERNAL COMPENSATION (SEE Figure 1) V (V) 1 1.2 1.8 3.3 5 OUT V (V) 4.5 to 18 4.5 to 18 4.5 to 18 4.5 to 18 6.5 to 18 IN FREQ (kHz) 300 300 600 600 600 Compensation Internal Internal Internal Internal Internal C (F) 3x22 3x22 3x22 3x22 3x22 IN (F) 1000 + 4x100 1000 + 3x100 4x100 4x100 4x100 C OUT L (H) 0.68 1 0.68 1 1.5 1 R (k ) 200 300 200 365 365 1 (k ) 300 300 100 80.6 49.9 R 2 C (pF) DNP DNP DNP 4.7 8.2 1 NOTES: 1. The design table is referencing the schematic shown in Figure 1. 2. Ceramic capacitors are selected for 22F and 100F in the table. 3. 1000F (5m ) are selected for low ESR conductive polymer aluminum solid capacitors. 4. Recommend to keep the inductor peak-to-peak current less than 6A. FN8925 Rev.1.00 Page 2 of 21 Mar 17, 2017