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PDF ISL854102 Data sheet ( Hoja de datos )
| Número de pieza | ISL854102 | |
| Descripción | 1.2A Synchronous Buck Regulator | |
| Fabricantes | Intersil | |
| Logotipo |  |
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DATASHEET
Wide VIN 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 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 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
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
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, VOUT = 5V, L1 = 22µH
July 1, 2016
FN8870.0
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 2016. 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  
ISL854102
Functional Block Diagram
SS EN
PG
VIN
FB
FS
SYNC
FB
OSCILLATOR
PFM
5M CURRENT
SET
INTERNAL = 50µA/V
EXTERNAL = 230µA/V
EN/SOFT-
START
POWER-
GOOD
LOGIC
5M
BIAS
LDO
600mV VREF
FAULT
LOGIC 500mV/A
CURRENT SENSE
PWM/PFM
SELECT LOGIC FB
sQ
RQ
PWM GATE
DRIVE AND
PWM DEADTIME
450mV/T SLOPE
COMPENSATION
(PWM ONLY)
150k
INTERNAL
54pF COMPENSATION
ZERO CURRENT
DETECTION
PACKAGE
PADDLE
COMP
GND
FIGURE 5. FUNCTIONAL BLOCK DIAGRAM
VCC
BOOT
PHASE
PGND
Ordering Information
PART NUMBER
(Notes 2, 3, 4)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL854102FRZ
4102
-40 to +125
12 Ld DFN
L12.4x3
NOTES:
2. Add “-T” suffix for 6k unit or “-T7A” suffix for 250 unit Tape and Reel options. 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 ISL854102. For more information on MSL please see techbrief TB363.
PART NUMBER
ISL85412
ISL85413
ISL85415
ISL85418
ISL85410
ISL854102
INPUT VOLTAGE
(V)
3.5 to 40
3.5 to 40
3 to 36
3 to 40
3 to 40
3 to 40
TABLE 2. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
OUTPUT
CURRENT
COMPENSATION
SWITCHING FREQUENCY
150mA
Internal Only
Internal 700kHz
300mA
Internal Only
Internal 700kHz
500mA
Internal/External Internal 500kHz/external 300kHz to 2MHz
800mA
Internal/External Internal 500kHz/external 300kHz to 2MHz
1A Internal/External Internal 500kHz/external 300kHz to 2MHz
1.2A
Internal/External Internal 500kHz/external 300kHz to 2MHz
EXT SYNC SOFT-START
No Internal
No Internal
Yes Internal/External
Yes Internal/External
Yes Internal/External
Yes Internal/External
Submit Document Feedback
5
FN8870.0
July 1, 2016
5 Page 
ISL854102
Measurements fSW = 500kHz, VIN = 24V, VOUT = 3.3V, TA = +25°C (Continued)
LX 20V/DIV
VOUT 10mV/DIV
VOUT 100mV/DIV
IL 200mA/DIV
1µs/DIV
FIGURE 24. LIGHT LOAD OPERATION AT 20mA
IL 1A/DIV
200µs/DIV
FIGURE 25. LOAD TRANSIENT, PFM
VOUT 100mV/DIV
IL 1A/DIV
200µs/DIV
FIGURE 26. LOAD TRANSIENT, PWM
LX 20V/DIV
VOUT 2V/DIV
IL 1A/DIV
PG 5V/DIV
50µs/DIV
FIGURE 27. OVERCURRENT PROTECTION, PWM
LX 20V/DIV
VOUT 2V/DIV
IL 1A/DIV
PG 5V/DIV
10ms/DIV
FIGURE 28. OVERCURRENT PROTECTION HICCUP, PWM
LX 20V/DIV
SYNC 2V/DIV
200ns/DIV
FIGURE 29. SYNC AT 1.2A LOAD, PWM
Submit Document Feedback 11
FN8870.0
July 1, 2016
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL854102.PDF ] | |
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