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Part: ISL6520BIR
Category:
Power Management
-> Desktop
Description: Single Synchronous Buck Pulse-width Modulation (PWM) Controller
Company: Intersil Corporation
Datasheet: Download ISL6520BIR datasheet File size : 402 kB
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Datasheet text preview:
®
ISL6520B
D a ta Sheet A p r i l 2003 FN9083.1
Single Synchronous Buck Pulse-Width Modulation (PWM) Controller
The ISL6520B makes simple work out of implementing a complete control scheme for a DC-DC stepdown converter. Designed to drive N-channel MOSFETs in a synchronous buck topology, the ISL6520B integrates the control, output adjustment and monitoring functions into a single 8-Lead package. The ISL6520B provides simple, single feedback loop, voltage-mode 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%.
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 · 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 ISL6520BCB ISL6520BIB ISL6520BCR ISL6520BIR 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 - SSTL-2 and DDR SDRAM Bus Termination Supply · 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
16 Ld 4x4mm QFN L16.4x4 16 Ld 4x4mm QFN L16.4x4
Evaluation Board
Pinouts
ISL6520B (8 LD SOIC) TOP VIEW
BOOT 1 UGATE 2 GND 3 LGATE 4 8 PHASE 7 COMP/SD 6 FB 5 VCC
ISL6520B (16 LD QFN) TOP VIEW
PHASE NC NC NC
16 15 14 13 BOOT 1 UGATE 2 GND 3 NC 4 5 LG ATE 6 NC 7 VCC 8 NC GND 1 2 NC 11 COMP/SD 1 0 NC 9 FB
· Low-Voltage Distributed Power Supplies
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.
ISL6520B Block Diagram
VCC
POR AND SOFTSTART
BOOT UGATE
PHASE + 0.8V ERROR AMP + PWM COMPARATOR + INHIBIT
-
-
-
GATE CONTROL LOGIC PWM
VCC
FB COMP/SD 20µA OSCILLATOR FIXED 300kHz GND LG ATE
Typical Application
5V CDCPL RPULLUP 5 VCC 1 BOOT CBOOT UGATE PHASE LGATE DBOOT
VI N
CHF
CBULK
ISL65 20B
COMP/SD SHUTDOWN RF CI CF 6 FB 3 GND 4 7 2 8
QU LOUT QL VOUT
COUT
ROFFSET RS
2
ISL6520B
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)
Operating Conditions
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5V ±10% Ambient Temperature Range - ISL6520BC . . . . . . . . . . 0oC to 70oC Ambient Temperature Range - ISL6520BI . . . . . . . . . -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
PARAMET ER VCC SUPPLY CURRENT Nominal Supply POWER-ON RESET Rising VCC POR Threshold VCC POR Threshold Hysteresis OSCILLATOR Fr equency
Recommended Operating Conditions, Unless Otherwise Noted. SYMB OL TEST CONDITIONS M IN T YP M AX UN ITS
IVCC
2.6
3. 2
3.8
mA
P OR
4.19 -
4.3 0 0. 2 5
4.50 -
V V
fOSC VOSC
ISL6520BC, VCC = 5V ISL6520BI, VCC = 5V
250 230 -
300 300 1. 5
340 340 -
kHz kHz VP-P
Ramp Amplitude REFERENCE Reference Voltage Tolerance
ISL6520BC ISL6520BI
-1.5 -2.5 -
-
+1.5 +2.5
% % V
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 DISABL E Disable Threshold
V REF
0. 8 00
-
Guaranteed By Design GBWP SR
-
88 15 8
-
dB MHz V/µ s
IUGATESRC
VBOOT - VPHASE = 5V, VUGATE = 4V
-
-1 1 -1 2
-
A A A A
IUGATE-SNK ILGATE-SRC VVCC = 5V, VLGATE = 4V ILGATE-SNK
VDISABLE
-
0. 8
-
V
3
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