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PDF ISL85418 Data sheet ( Hoja de datos )
| Número de pieza | ISL85418 | |
| Descripción | 800mA Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
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DATASHEET
Wide VIN 800mA Synchronous Buck Regulator
ISL85418
Features
The ISL85418 is a 800mA 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 ISL85418 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 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 ISL85418 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 an operation temperature range of -40°C to
+125°C.
Related Literature
• 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 800mA
• 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
• AN1905, “ISL85410EVAL1Z, ISL85418EVAL1Z Wide VIN 1A,
800mA Synchronous Buck Regulator”
• AN1908, “ISL85410DEMO1Z, ISL85418DEMO1Z Wide VIN
1A, 800mA Synchronous Buck Regulator”
CBOOT
100nF
COUT
10µF
VOUT
L1
22µH
CVIN
10µF
1 SS
2
SYNC
3 BOOT
4 VIN
5 PHASE
6 PGND
GND
FS 12
COMP 11
10
FB
9
VCC
PG
EN
R2
CVCC
1µF
R3
CFB
INTERNAL DEFAULT PARAMETER SELECTION
FIGURE 1. TYPICAL APPLICATION
100
95 VIN = 12V
VIN = 5V
90
85
80
75
VIN = 15V
VIN = 33V
70
65
60 VIN = 24V
55
50
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7
OUTPUT LOAD (A)
FIGURE 2. EFFICIENCY vs LOAD, PFM, VOUT = 3.3V
0.8
March 13, 2015
FN8369.5
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2013-2015. All Rights Reserved
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.
1 page  
Functional Block Diagram
ISL85418
FB
FS
SYNC
OSCILLATOR
PFM
5M CURRENT
SET
gm
INTERNAL = 50µA/V
EXTERNAL = 230µA/V
EN/SOFT-START
POWER
GOOD
LOGIC
600mV VREF
FAULT
LOGIC
PWM/PFM
SELECT LOGIC
FB
5M
500mV/A
CURRENT
SENSE
sQ
RQ
BIAS
LDO
PWM
GATE
DRIVE
AND
PWM DEADTIME
450mV/T SLOPE
COMPENSATION
(PWM ONLY)
150k
INTERNAL
54pF COMPENSATION
ZERO CURRENT
DETECTION
PACKAGE
PADDLE
VCC
BOOT
PHASE
PGND
Ordering Information
PART NUMBER
(Notes 2, 3, 4)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL85418FRZ
5418
-40 to +125
12 Ld DFN
L12.4x3
ISL85418EVAL1Z
Evaluation Board
ISL85418DEMO1Z
Demonstration Board
NOTES:
2. Add “-T*” suffix for Tape and Reel. Please refer to TB347 for details on reel specifications.
3. 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.
4. For Moisture Sensitivity Level (MSL), please see device information page for ISL85418. For more information on MSL please see techbrief TB363.
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5
FN8369.5
March 13, 2015
5 Page 
ISL85418
Measurements
fSW = 500kHz, VIN = 24V, VOUT = 3.3V, TA = +25°C (Continued)
LX 20V/DIV
VOUT 2V/DIV
LX 20V/DIV
VOUT 2V/DIV
IL 500mA/DIV
PG 2V/DIV
5ms/DIV
FIGURE 23. START-UP AT 800mA, PWM
IL 500mA/DIV
PG 2V/DIV
200µs/DIV
FIGURE 24. SHUTDOWN AT 800mA, PWM
LX 20V/DIV
VOUT 2V/DIV
IL 500mA/DIV
PG 2V/DIV
5ms/DIV
FIGURE 25. START-UP AT 800mA, PFM
LX 20V/DIV
VOUT 2V/DIV
IL 500mA/DIV
200µs/DIV
PG 2V/DIV
FIGURE 26. SHUTDOWN AT 800mA, PFM
LX 5V/DIV
50ns/DIV
FIGURE 27. JITTER AT NO LOAD, PWM
LX 5V/DIV
50ns/DIV
FIGURE 28. JITTER AT 800mA LOAD, PWM
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FN8369.5
March 13, 2015
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet ISL85418.PDF ] | |
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