DATASHEET
9A, 3.8V to 18V Input, Synchronous Buck Regulator
ISL85009
Features
The ISL85009 is a highly efficient, monolithic, synchronous
buck regulator that can deliver 9A of continuous output current
from a 3.8V to 18V input supply. The device uses current mode
control architecture with a fast transient response and
excellent loop stability.
• Power input voltage range variable 3.8V to 18V
• PWM output voltage adjustable from 0.6V
• Up to 9A output load
• Prebias start-up, fixed 3ms soft-start
• Selectable f
synchronization up to 1MHz
of 300kHz, 600kHz, and external
The ISL85009 integrates very low ON-resistance high-side and
low-side FETs to maximize efficiency and minimize external
component count. The minimum BOM and easy layout
footprint are extremely friendly to space constraint systems.
SW
• Peak current mode control
- DCM/CCM
The operation frequency of this device can be set using the
FREQ pin: 600kHz (FREQ = float) and 300kHz (FREQ = GND).
The device can also be synchronized to an external clock up to
1MHz.
- Thermally compensated current limit
- Internal/external compensation
• Open-drain PG window comparator
• Output overvoltage and thermal protection
• Input overvoltage protection
Both high-side and low-side MOSFET current limit along with
reverse current limit, fully protect the regulator in an
overcurrent event. Selectable OCP schemes can fit various
applications. Other protections, such as input/output
overvoltage and over-temperature, are also integrated into the
device which give required system level safety in the event of
fault conditions.
• Integrated boot diode with undervoltage detection
• Selectable OCP schemes
- Hiccup OCP
- Latch-off
The ISL85009 is offered in a space saving 15 Ld 3.5mmx3.5mm
Pb-free TQFN package with great thermal performance and
0.8mm maximum height.
• Compact size 3.5mmx3.5mm, 15 Ld TQFN
Applications
• Servers and cloud infrastructure POLs
• IPCs, factory automation, PLCs
• Telecom and networking systems
• Storage systems
Related Literature
• For a full list of related documents please visit our web page
- ISL85009 product page
• Test measurement
R
2
C
1
C
VIN
R
3
100
90
80
70
60
50
R
1
15
14
13
12
11
10
VIN EN DNC DNC COMP FB
VIN
9
8
L
1
PVIN
VOUT
4.5V TO
18V
PHASE
C
IN
7
GND
C
OUT
SYNC MODE FREQ PG VDD BOOT
1
2
3
4
5
6
Vout = 5V, fsw = 600kHz
Vout = 3.3V, fsw = 600kHz
40
30
C
2.2µF
VDD
C
BOOT
100nF
0
1
2
3
4
5
6
7
8
9
OUTPUT CURRENT (A)
FIGURE 1. TYPICAL APPLICATION SCHEMATIC FOR INTERNAL COMPENSATION
FIGURE 2. EFFICIENCY (V = 12V)
IN
February 13, 2017
FN8918.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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