ISL8540 Datasheet, PDF (1/16 Pages) Intersil Corporation – DC/DC Power Switching Regulator

®
Data Sheet
September 9, 2008
ISL8540
FN6495.5
DC/DC Power Switching Regulator
The ISL8540 is a step down DC/DC power switching
regulator which accepts 9.0V to 40V input and provides a 2A
output current. The output voltage can be set in the range
between 1.21V and 35V by means of an external divider.
The device uses an internal power DMOS transistor with a
typical r_DS(ON) of 0.19Ω to obtain very high efficiency and
high switching speed. A switching frequency in the range of
100kHz to 600kHz can be realized (the maximum power
dissipation of the various packages must be observed).
Notable features of this next generation of DC/DC converter
include pulse-by-pulse current limit for FET protection,
hiccup mode for short circuit protection, voltage feedforward
regulation, Frequency SYNC, soft-start, low standby current
of 60µA typical in the disabled state, and thermal shut-down.
The device is available in a 20 Ld HTSSOP package.
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL8540IVEZ ISL85 40IVEZ -40 to +85 20 Ld HTSSOP MDP0048
ISL8540IVEZ-T* ISL85 40IVEZ -40 to +85 20 Ld HTSSOP MDP0048
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach materials,
and 100% matte tin plate plus anneal (e3 termination finish, which is
RoHS compliant and compatible with both SnPb and Pb-free soldering
operations). Intersil Pb-free products are MSL classified at Pb-free
peak reflow temperatures that meet or exceed the Pb-free
requirements of IPC/JEDEC J STD-020.
Features
• Voltage feedforward mode
• Step down DC/DC supporting up to 2A
• Input voltage range of 9.0V to 40V
• Internal reference of 1.21V ±1%
• Adjustable output voltage range of 1.21V to 35V
• Adjustable switching frequency 100kHz to 600kHz
• Frequency SYNC pin
• Zero load current operation
• Pulse-by-pulse mode current limit and Hiccup mode
• Low standby current of 60µA typical
• Thermal shut-down
• Load dump to 100V for 400ms
• Pb-free (RoHS compliant)
Applications
• Non-isolated telecom power supply
• Industrial and automotive power supplies
• Portable computers
• Battery chargers
• Distributed power systems
Related Literature
• Technical Brief TB363 “Guidelines for Handling and
Processing Moisture Sensitive Surface Mount Devices
(SMDs)”
Pinout
ISL8540
(20 LD HTSSOP)
TOP VIEW
VIN 1
VIN 2
LX 3
LX 4
BOOT 5
EN 6
VCC5 7
SYNC 8
RTCT 9
SGND 10
20 VIN
19 VIN
18 LX
17 LX
16 SS
15 PGND
14 PGOOD
13 REF
12 COMP
11 FB
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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