ISL85410 Datasheet, PDF (1/21 Pages) Intersil Corporation – Wide VIN 1A Synchronous Buck Regulator

Wide V_IN 1A Synchronous Buck Regulator
ISL85410
Features
The ISL85410 is a 1A Synchronous buck regulator with an
input range of 3V to 36V. It provides an easy to use, high
efficiency low BOM count solution for a variety of applications.
The ISL85410 integrates both high-side and low-side NMOS
FET's and features a PFM mode for improved efficiency at light
loads. This feature can be disabled if forced PWM mode is
desired. The part switches at a default frequency of 500kHz
but may also be programmed using an external resistor from
300kHz to 2MHz. The ISL85410 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 an operation temperature range of -40°C to
+125°C
• Wide input voltage range 3V to 36V
• 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 1A
• 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
Related Literature
• See AN1905, “ISL85410EVAL1Z, ISL85410AEVAL1Z,
ISL85418EVAL1Z Wide VIN 1A, 800mA Synchronous Buck
Regulator”
• See AN1908, “ISL85410DEMO1Z, ISL85418DEMO1Z Wide
VIN 1A, 800mA Synchronous Buck Regulator”
CBOOT
100nF
VOUT
COUT
10µF
L1
22µH
CVIN
10µF
1 SS
2
SYNC
3 _BOOT
4 _VIN
5 _PHASE
6
PGND
GND
FS ¹²
11
COMP
10
FB
9
VCC
PG
EN
R2
R3
CVCC
1µF
CFB
INTERNAL DEFAULT PARAMETER SELECTION
FIGURE 1. TYPICAL APPLICATION
100
95
V_IN = 5V
90
V_IN = 12V
85
80
V_IN = 15V
75
70
65
V_IN = 24V
V_IN = 33V
60
55
50
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, PFM, V_OUT = 3.3V
November 22, 2013
1
FN8375.2
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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