ISL854102 Datasheet, PDF (1/19 Pages) Intersil Corporation – Wide VIN 1.2A Synchronous Buck Regulator

DATASHEET
Wide V_IN 1.2A Synchronous Buck Regulator
ISL854102
Features
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 V_IN 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
+125°C.
• 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
Applications
• Industrial control
• Medical devices
• Portable instrumentation
• Distributed power supplies
• Cloud infrastructure
1 _SS
FS ¹²
2
SYNC
COMP ¹¹
R2
CFB
CBOOT
100nF
COUT
10µF
VOUT
L1
22µH
CVIN
10µF
3 _BOOT
4 _VIN
5 _PHASE
6 _PGND
GND
10
FB
9
VCC
PG
EN
R3
CVCC
1µF
INTERNAL DEFAULT PARAMETER SELECTION
FIGURE 1. TYPICAL APPLICATION
100
95
90
85
80
75
70
65
VIN=12V
60
VIN=15V
55
VIN=24V
50
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, V_OUT = 5V, L₁ = 22µH
July 1, 2016
1
FN8870.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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