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Part: ISL6520CR
Category:
Power Management
-> Desktop
Description: Single Synchronous Buck Pulse-width Modulation (PWM) Controller
Company: Intersil Corporation
Datasheet: Download ISL6520CR datasheet File size : 402 kB
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Datasheet text preview:
®
ISL6520
D a ta Sheet M ar c h 2003 FN9009.2
Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
The ISL6520 makes simple work out of implementing a complete control and protection scheme for a DC-DC stepdown converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, the ISL6520 integrates the control, output adjustment, monitoring and protection functions into a single 8-pin package. The ISL6520 provides simple, single feedback loop, voltagemode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency. The error amplifier features a 15MHz gain-bandwidth product and 8V/µs slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%. Protection from over-current conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor.
Features
· Operates from +5V Input · 0.8V to VIN Output Range - 0.8V Internal Reference - ±1.5% Over Line Voltage and Temperature · Drives N-Channel MOSFETs · Simple Single-Loop Control Design - Voltage-Mode PWM Control · Fast Transient Response - High-Bandwidth Error Amplifier - Full 0% to 100% Duty Cycle · Lossless, Programmable Over-Current Protection - Uses Upper MOSFET's rDS(on) · Small Converter Size - 300kHz Fixed Frequency Oscillator - Internal Soft Start - 8 Ld SOIC or 16Ld 4x4mm QFN · QFN Package: - Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline - Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
Ordering Information
PART NUMBER ISL6520 CB ISL6520 IB ISL6520 CR ISL6520 IR ISL6520EVAL1 TEMP. RANGE (oC) 0 to 70 -40 to 85 0 to 70 -40 to 85 PACK AGE 8 Ld SOIC 8 Ld SOIC PKG. NO. M8.15 M8.15
Applications
· Power Supplies for Microprocessors - PCs - Embedded Controllers · Subsystem Power Supplies - PCI/AGP/GTL+ Buses - ACPI Power Control · Cable Modems, Set Top Boxes, and DSL Modems · DSP and Core Communications Processor Supplies · Memory Supplies · Personal Computer Peripherals · Industrial Power Supplies · 5V-Input DC-DC Regulators · Low-Voltage Distributed Power Supplies
16 Ld 4x4mm QFN L16.4x4 16 Ld 4x4mm QFN L16.4x4
Evaluation Board
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved All other trademarks mentioned are the property of their respective owners.
ISL6520 Pinouts
SOIC TOP VIEW
BOOT 1 UGATE 2 GND 3 LGATE 4 8 PHASE 7 COMP/SD 6 FB 5 VCC BOOT 1 UGATE 2 GND 3 NC 4 5 LG ATE 6 NC 7 VCC 8 NC
BOOT UGATE PHASE + 0.8V ERROR AMP + PWM COMPARATOR + INHIBIT LGATE 20µA OSCILLATOR FIXED 300kHz GND
QFN TOP VIEW
PHASE NC NC NC 1 2 NC GND 11 COMP/OCSET 1 0 NC 9 FB
16 15 14 13
Block Diagram
VCC
SAMPLE AND HOLD
+ OC COMPARATOR
-
POR AND SOFTSTART
-
-
-
GATE CONTROL LOGIC PWM
VCC
FB COMP/OCSET
Typical Application
VCC
CDCPL VCC ROCSET 5
CBULK DBOOT 1 BOOT CBOOT LOUT
CHF
ISL6520
COMP/OCSET RF CI CF 6 FB 3 GND 4 7 2 8
UGATE PHASE LGATE
+VO
COUT
ROFFSET RS
2
ISL6520
Absolute Maximum Ratings
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +6.0V Absolute Boot Voltage, VBOOT . . . . . . . . . . . . . . . . . . . . . . . +15.0V Upper Driver Supply Voltage, VBOOT - VPHASE . . . . . . . . . . . +6.0V Input, Output or I/O Voltage . . . . . . . . . . . GND -0.3V to VCC +0.3V ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2
Thermal Information
Thermal Resistance JA (oC/W) JC (oC/W) SOIC Package (Note 1) . . . . . . . . . . . . . . 95 N/A QFN Package (Note 2, 3). . . . . . . . . . . . . . 45 7 Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150oC Maximum Storage Temperature Range . . . . . . . -65oC to 150oC Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300oC (SOIC - Lead Tips Only)
Recommended Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±10% Ambient Temperature Range - ISL6520C . . . . . . . . . . . 0oC to 70oC Ambient Temperature Range - ISL6520I . . . . . . . . . . -40oC to 85oC Junction Temperature Range . . . . . . . . . . . . . . . . . -40oC to 125oC
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.
NOTES: 1. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details. 2. JA 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. 3. For JC, the "case temp" location is the center of the exposed metal pad on the package underside.
Electrical Specifications
PARAMETER VCC SUPPLY CURRENT Nominal Supply POWER-ON RESET Rising VCC POR Threshold VCC POR Threshold Hysteresis OSCILL ATOR Frequency Ramp Amplitude REF E RENCE Reference Voltage Tolerance Nominal Reference Voltage ERROR AMPLIFIER DC Gain Gain-Bandwidth Product Slew Rate GATE DRIVERS Upper Gate Source Current Upper Gate Sink Current Lower Gate Source Current Lower Gate Sink Current PROTECTION / DISABLE OCSET Current Source Disable Threshold
Recommended Operating Conditions, Unless Otherwise Noted. SYMBOL I VCC POR TEST CONDITIONS UGATE and LGATE Open MIN 2.6 4.19 fOSC VOSC I SL6520C ISL6520I VREF Guaranteed By Design GBWP SR IUGATESRC
T YP 3. 2 4.30 0. 25 300 300 1. 5 0. 80 0 88 15 8 -1 1 -1 2 20 20 0. 8
MAX 3 .8 4 .5 340 340 +1.5 +2.5 22 24 -
UNITS mA V V kHz kHz VP-P % % V dB M Hz V /µ s A A A A µA µA V
ISL6520C, VCC = 5V ISL6520I, VCC = 5V
250 230 -1.5 -2.5 -
IUGATE-SNK ILGATE-SRC ILGATE-SNK IOCSET VDISABLE ISL6520C ISL6520I
17 14 -
3
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