Wide VIN 1.2A Synchronous Buck Regulator
The ISL854102 is a 1.2A synchronous buck regulator with an
input range of 3V to 40V. It provides an easy to use, high
efficiency, low BOM count solution for a variety of applications.
The ISL854102 integrates both high-side and low-side NMOS
FETs and features a PFM mode for improved efficiency at light
loads. This feature can be disabled if a forced PWM mode is
desired. The part switches at a default frequency of 500kHz,
however, may also be programmed using an external resistor
from 300kHz to 2MHz. The ISL854102 has the ability to utilize
internal or external compensation. By integrating both NMOS
devices and providing internal configuration options, minimal
external components are required, reducing BOM count and
complexity of design.
With the wide VIN range and reduced BOM, the part provides
an easy to implement design solution for a variety of
applications while giving superior performance. It will provide
a very robust design for high voltage industrial applications as
well as an efficient solution for battery powered applications.
The part is available in a small Pb-free 4mmx3mm DFN plastic
package with a full-range industrial temperature of -40°C to
• Wide input voltage range 3V to 40V
• Synchronous operation for high efficiency
• No compensation required
• Integrated high-side and low-side NMOS devices
• Selectable PFM or forced PWM mode at light loads
• Internal fixed (500kHz) or adjustable switching frequency
300kHz to 2MHz
• Continuous output current up to 1.2A
• Internal or external soft-start
• Minimal external components required
• Power-good and enable functions available
• Industrial control
• Medical devices
• Portable instrumentation
• Distributed power supplies
• Cloud infrastructure
INTERNAL DEFAULT PARAMETER SELECTION
FIGURE 1. TYPICAL APPLICATION
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, PFM, VOUT = 5V, L1 = 22µH
July 1, 2016
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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