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PDF ISL8502 Data sheet ( Hoja de datos )
| Número de pieza | ISL8502 | |
| Descripción | 2.5A Synchronous Buck Regulator | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
January 17, 2007
ISL8502
FN6389.0
2.5A Synchronous Buck Regulator with
Integrated MOSFETs
The ISL8502 is a synchronous buck controller with internal
MOSFETs packaged in a small 4mmx4mm QFN package.
The ISL8502 can support a continuous load of 2.5A 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 ISL8502 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 ISL8502 features a bidirectional
Enable pin that allows the part to pull the enable pin low
during fault detection.
Pinout
ISL8502
(24 LD QFN)
TOP VIEW
24 23 22 21 20 19
PGOOD 1
18 VIN
SGND 2
17 PHASE
EN 3
SYNCH 4
M/S 5
GND
25
16 PHASE
15 PHASE
14 PHASE
FS 6
13 PGND
7 8 9 10 11 12
Features
• Over 2.5A Continuous Output Current
• Integrated MOSFETs for Small Regulator Footprint
• Adjustable Switching Frequency, 500kHz - 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
Protection
• Undervoltage Detection
• Integrated Thermal Shutdown Protection
• Power Good Indication
• Adjustable Soft-Start
• Pb-Free Plus Anneal Available (RoHS Compliant)
Applications
• Point of Load Applications
• Graphics Cards - GPU and Memory Supplies
• ASIC Power Supplies
• Embedded Processor and I/O supplies
• DSP Supplies
Ordering Information
PART
PART
TEMP.
NUMBER MARKING RANGE (°C) PACKAGE
PKG.
DWG. #
ISL8502IRZ* 85 02IRZ -40 to +85 24 Ld 4x4 QFN L24.4x4D
(Note)
(Pb-free)
*Add “-T” suffix for tape and reel.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
material sets; molding compounds/die attach materials and 100% matte
tin plate termination finish, which are 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.
1 b CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright © Intersil Americas Inc. 2006, 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL8502
Absolute Maximum Ratings
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +16.5V
VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +6.0V
Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +22.0V
Upper Driver Supply Voltage, VBOOT - VPHASE . . . . . . . . . . . +6.0V
All other Pins . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC + 0.3V
Recommended Operating Conditions
Supply Voltage on VIN . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5V to 14V
Ambient Temperature Range . . . . . . . . . . . . . . . . . . -40°C to +85°C
Junction Temperature Range. . . . . . . . . . . . . . . . . -40°C to +125°C
Thermal Information
Thermal Resistance
θJA (°C/W) θJC (°C/W)
QFN Package (Notes 1, 2) . . . . . . . . .
39
2.5
Maximum Junction Temperature (Plastic Package) . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . -65°C to +150°C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . +300°C
(SOIC - Lead Tips Only)
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
150°C max junction temperature is intended for short periods of time to prevent shortening the lifetime. Operation close to 150°C junction may trigger the shutdown of
the device even before 150°C, since this number is specified as typical.
NOTE:
1. θJA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See
Tech Brief TB379.
2. For θJC, the “case temp” location is the center of the exposed metal pad on the package underside.
3. Not production tested.
4. Minimum VIN can operate below 5.5V as long as VCC is greater than 4.5V.
5. Maximum VIN can be higher than 14V voltage stress across the upper and lower do not exceed 15.5V in all conditions.
6. Circuit requires 100ns minimum on time to detect over current condition.
Electrical Specifications
PARAMETER
Refer to Block and Simplified Power System Diagrams and Typical Application Schematics. Operating
Conditions Unless Otherwise Noted: Vin = 12V, or VCC = 5V ±10%, TA = -40°C to +85°C. Typical are at
TA = +25°C.
SYMBOL
TEST CONDITIONS
MIN TYP MAX UNITS
VIN SUPPLY
Input Voltage Range
Input Operating Supply Current
Input Standby Supply Current
SERIES REGULATOR
IQ
IQ_SBY
VIN
VIN tied to VCC
VFB = 1.0V
EN tied to GND, VIN = 14V
5.54 145
4.5 5.5
7
1.25 2
V
V
mA
mA
VCC Voltage
Maximum Output Current
VCC Current Limit
POWER-ON RESET
VPVCC
IPVCC
VIN > 5.6V
4.5 5.0 5.5
VIN = 12V
50
VIN = 12V, VCC shorted to PGND. Note 3
300
V
mA
mA
Rising VCC POR Threshold
4.2 4.4 4.49
V
Falling VCC POR Threshold
3.85 4.0 4.10
V
ENABLE
Rising Enable Threshold Voltage
Falling Enable Threshold Voltage
Enable Sinking Current
OSCILLATOR
VEN_Rising
VEN_Fall
IEN
2.7
2.3
500
V
V
μA
PWM Frequency
fOSC
RT = 96kΩ
RT = 40kΩ
FS pin tied to VCC
400 500 600
960 1200 1440
800
kHz
kHz
kHz
Ramp Amplitude
ΔVOSC
VIN = 14V
1.0 V
5 FN6389.0
January 17, 2007
5 Page 
ISL8502
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)
PHASE1
5V/DIV
IL1
0.5A/DIV
VOUT1 RIPPLE
20mV/DIV
SYNCH1
2V/DIV
FIGURE 25. MASTER OPERATION AT NO LOAD
PHASE1
5V/DIV
VOUT1 RIPPLE
20mV/DIV
IL1
1A/DIV
SYNCH1
5V/DIV
FIGURE 26. MASTER OPERATION WITH FULL LOAD
PHASE1
10V/DIV
IL1
1A/DIV
VOUT1 RIPPLE
20mV/DIV
SYNCH1
5V/DIV
FIGURE 27. MASTER OPERATION WITH NEGATIVE LOAD
EN1
5V/DIV
VOUT1
1V/DIV
IL1
2A/DIV
SS1
2V/DIV
FIGURE 28. SOFT-START AT NO LOAD
EN1
5V/DIV
VOUT1
1V/DIV
IL1
1A/DIV
SS1
2V/DIV
FIGURE 29. SOFT-START AT FULL LOAD
11
PHASE1
10V/DIV
VOUT1
1V/DIV
IL1
1A/DIV
PGOOD1
5V/DIV
FIGURE 30. POSITIVE OUTPUT SHORT CIRCUIT
FN6389.0
January 17, 2007
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet ISL8502.PDF ] | |
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