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PDF 8502A Data sheet ( Hoja de datos )
| Número de pieza | 8502A | |
| Descripción | ISL8502A | |
| Fabricantes | Intersil Corporation | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 8502A (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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2A Synchronous Buck Regulator with Integrated
MOSFETs
ISL8502A
The ISL8502A is a synchronous buck controller with internal
MOSFETs packaged in a small 4mmx4mm QFN package. The
ISL8502A can support a continuous load of 2A and has a very
wide input voltage range. With the switching MOSFETs
integrated into the IC, the complete regulator footprint can be
very small and provide a much more efficient solution than a
linear regulator.
The ISL8502A is capable of stand-alone operation or it can be
used in a master slave combination for multiple outputs that
are derived from the same input rail. Multiple slave channels
(up to six) can be synchronized. This method minimizes the
EMI and beat frequencies effect with multi-channel operation.
The switching PWM controller drives two internal N-Channel
MOSFETs in a synchronous-rectified buck converter topology.
The synchronous buck converter uses voltage-mode control
with fast transient response. The switching regulator provides
a maximum static regulation tolerance of ±1% over line, load,
and temperature ranges. The output is user-adjustable by
means of external resistors down to 0.6V.
The output is monitored for undervoltage events. The switching
regulator also has overcurrent protection. Thermal shutdown is
integrated. The ISL8502A features a bi-directional Enable pin
that allows the part to pull the enable pin low during fault
detection.
PGOOD delay for ISL8502A has been decreased to 1ms typical
(at 500kHz switching frequency) compared to 250ms (at
500kHz) for ISL8502.
Features
• Up to 2A Continuous Output Current
• Integrated MOSFETs for Small Regulator Footprint
• Adjustable Switching Frequency, 500kHz to 1.2MHz
• Tight Output Voltage Regulation, ±1% Over-temperature
• Wide Input Voltage Range, 5V ±10% or 5.5V to 14V
• Wide Output Voltage Range, from 0.6V
• Simple Single-Loop Voltage-Mode PWM Control Design
• Input Voltage Feed-Forward for Constant Modulator Gain
• Fast PWM Converter Transient Response
• Lossless rDS(ON) High Side and Low Side Overcurrent
Protections
• Undervoltage Detection
• Integrated Thermal Shutdown Protection
• Power-Good Indication
• Adjustable Soft-Start
• Start-Up with Pre-Bias Output
• Pb-free (RoHS Compliant)
Applications
www.DataSheet.co.kr
• Point of Load Applications
• Graphics Cards - GPU and Memory Supplies
• ASIC Power Supplies
• Embedded Processor and I/O Supplies
• DSP Supplies
POWER GOOD
ENABLE
PGOOD
EN
VIN
+
VIN
5.5V TO 14V
POWER GOOD
ENABLE
SYNCH
M/S
BOOT
VCC
PVCC
SS
ISL8502A
PHASE
VOUT
+
PGND
FS
FB
SGND
COMP
PGOOD
EN
PVCC
VCC
SS
SYNCH
M/S
FS
SGND
VIN
BOOT
ISL8502A
PHASE
PGND
FB
COMP
4.5V TO 5.5VVIN
+
VOUT
+
FIGURE 1. STAND-ALONE REGULATOR: VIN 5.5V TO 14V
FIGURE 2. STAND-ALONE REGULATOR: VIN 4.5V TO 5.5V
October 21, 2011
FN7940.0
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 Inc. 2011. 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.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
ISL8502A
ISL8502A With Multiple Slaved Channels
VIN
MASTER
M/S PVCC VIN
SS
FS
SYNCH PHASE
RT EN
GND
VOUT1
+
ISL8502A
ENABLE
5k
RT
M/S VIN
FS
SYNCH PHASE
EN
GND
ISL8502A
SLAVE
VOUT2
+
www.DataSheet.co.kr
5k
RT
M/S VIN
FS
SYNCH PHASE
EN
GND
ISL8502A
SLAVE
VOUTN
+
5 FN7940.0
October 21, 2011
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
ISL8502A
Typical Performance Curves VIN = 12V, VOUT = 2.5V, IO = 2A, fs = 500kHz, L = 4.7µH, CIN = 20µF,
COUT = 100µF + 22µF, TA = +25° C, unless otherwise noted. (Continued)
0P.H5µAsSE1
5V/DIV
PHASE2
5V/DIV
VOUT1 RIPPLE
20mV/DIV
VOUT2 RIPPLE
20mV/DIV
FIGURE 23. MASTER TO SLAVE OPERATION
PHASE1
5V/DIV
IL1
0.5A/DIV
VOUT1 RIPPLE
20mV/DIV
SYNCH1
2V/DIV
FIGURE 24. MASTER OPERATION AT NO LOAD
PHASE1
5V/DIV
VOUT1 RIPPLE
20mV/DIV
IL1
1A/DIV
SYNCH1
5V/DIV
FIGURE 25. MASTER OPERATION WITH FULL LOAD
www.DataSheet.co.kr
PHASE1
10V/DIV
IL1
1A/DIV
VOUT1 RIPPLE
20mV/DIV
SYNCH1
5V/DIV
FIGURE 26. MASTER OPERATION WITH NEGATIVE LOAD
EN1
5V/DIV
VOUT1
1V/DIV
IL1
2A/DIV
SS1
2V/DIV
FIGURE 27. SOFT-START AT NO LOAD
11
EN1
5V/DIV
2V PRE-BIASED
IL1
1A/DIV
VOUT1
0.5V/DIV
SS1
2V/DIV
FIGURE 28. START-UP WITH PRE-BIASED
FN7940.0
October 21, 2011
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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| PDF Descargar | [ Datasheet 8502A.PDF ] | |
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