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ISL8002AFRZ-T Datasheet(PDF) 1 Page - Renesas Technology Corp |
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ISL8002AFRZ-T Datasheet(HTML) 1 Page - Renesas Technology Corp |
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1 / 23 page  FN7888 Rev 4.00 Page 1 of 23 July 31, 2014 FN7888 Rev 4.00 July 31, 2014 ISL8002, ISL8002A, ISL80019, ISL80019A Compact Synchronous Buck Regulators DATASHEET The ISL8002, ISL8002A, ISL80019 and ISL80019A are highly efficient, monolithic, synchronous step-down DC/DC converters that can deliver up to 2A of continuous output current from a 2.7V to 5.5V input supply. They use peak current mode control architecture to allow very low duty cycle operation. They operate at either 1MHz or 2MHz switching frequency, thereby providing superior transient response and allowing for the use of small inductors. They also have excellent stability and provide both internal and external compensation options. The ISL8002, ISL8002A, ISL80019 and ISL80019A integrate very low rDS(ON) MOSFETs in order to maximize efficiency. In addition, since the high-side MOSFET is a PMOS, the need for a Boot capacitor is eliminated, thereby reducing external component count. They can operate at 100% duty cycle (at 1MHz) with a dropout of 200mV at 2A output current. These devices can be configured for either PFM (discontinuous conduction) or PWM (continuous conduction) operation at light load. PFM provides high efficiency by reducing switching losses at light loads and PWM reduces noise susceptibility and RF interference. These devices are offered in a space saving 8 pin 2mmx2mm TDFN lead free package with exposed pad for improved thermal performance. The complete converter occupies less than 0.10in2 area. Features •VIN range 2.7V to 5.5V •VOUT range is 0.6V to VIN •IOUT maximum is 1.5A or 2A (see Table 1 on page 3) • Switching frequency is 1MHz or 2MHz (see Table 1 on page 3) • Internal or external compensation option • Selectable PFM or PWM operation option • Overcurrent and short circuit protection • Over-temperature/thermal protection •VIN Undervoltage Lockout and VOUT Overvoltage Protection • Up to 95% peak efficiency Applications • General purpose point of load DC/DC • Set-top boxes and cable modems •FPGA power • DVD, HDD drives, LCD panels, TV Related Literature • See AN1803, “1.5A/2A Low Quiescent Current High Efficiency Synchronous Buck Regulator” FIGURE 1. TYPICAL APPLICATION CIRCUIT CONFIGURATION (INTERNAL COMPENSATION OPTION) FIGURE 2. EFFICIENCY vs LOAD FSW = 1MHz, VIN = 3.3V, MODE = PFM, TA = +25°C VIN EN MODE PG PHASE COMP PGND FB 1 3 2 4 8 6 7 5 R2 VOUT 100k 1% L1 200k 1% C1 22 μF 1.2 μH 22 μF 22 μF C5 C6 R1 +0.6V GND VIN GND EN PG ISL8002 PAD 9 +2.7V …+5.5V +1.8V/2A R1 R2 VO VFB ------------ 1 – = (EQ. 1) 40 50 60 70 80 90 100 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT LOAD (A) 1.2VOUT 1.5VOUT 1.8VOUT 2.5VOUT 0.8VOUT 0.9VOUT |
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