isl6520acrz-t Intersil Corporation, isl6520acrz-t Datasheet

isl6520acrz-t

Manufacturer Part Number

isl6520acrz-t

Description

Single Synchronous Buck Pulse-width Modulation Pwm Controller Isl6520a

Manufacturer

Intersil Corporation

Datasheet

1.ISL6520ACRZ-T.pdf (12 pages)

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Single Synchronous Buck Pulse-Width

Modulation (PWM) Controller

The ISL6520A 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 ISL6520A

integrates the control, output adjustment, monitoring and

protection functions into a single 8-Lead package.

The ISL6520A 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/ms slew rate which enables high converter

bandwidth for fast transient performance. The resulting

PWM duty cycles range from 0% to 100%.

Protection from overcurrent conditions is provided by

monitoring the r

operation appropriately. This approach simplifies the

implementation and improves efficiency by eliminating the

need for a current sense resistor.

Pinouts

UGATE

BOOT

GND

UGATE

LGATE

DS(ON)

BOOT

GND

of the upper MOSFET to inhibit PWM

(16 LD QFN)

(6 LD SOIC)

TOP VIEW

ISL6520A

Data Sheet

8 8

PHASE

COMP/SD

VCC

COMP/OCSET

1-888-INTERSIL or 1-888-468-3774

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

Features

• Operates from +5V Input

• 0.8V to V

• Drives N-Channel MOSFETs

• Simple Single-Loop Control Design

• Fast Transient Response

• Lossless, Programmable Overcurrent Protection

• Small Converter Size

• QFN Package:

• Pb-Free Plus Anneal Available (RoHS Compliant)

Applications

• Power Supplies for Microprocessors

• Subsystem Power Supplies

• 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

- 0.8V Internal Reference

- ±1.5% Over Line Voltage and Temperature

- Voltage-Mode PWM Control

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Cycle

- Uses Upper MOSFET’s r

- 300kHz Fixed Frequency Oscillator

- Internal Soft-Start

- 8 Ld SOIC or 16 Ld 4mmx4mm QFN

- Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat

- Near Chip Scale Package footprint, which improves

- PCs

- Embedded Controllers

- PCI/AGP/GTL+ Buses

- ACPI Power Control

- SSTL-2 and DDR SDRAM Bus Termination Supply

No Leads - Package Outline

PCB efficiency and has a thinner profile

March 28, 2007

All other trademarks mentioned are the property of their respective owners.

Intersil (and design) is a registered trademark of Intersil Americas Inc.

Output Range

DS(ON)

ISL6520A

FN9016.5

Related parts for isl6520acrz-t

isl6520acrz-t Summary of contents

Page 1

Data Sheet Single Synchronous Buck Pulse-Width Modulation (PWM) Controller The ISL6520A 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 ...

Page 2

... ISL6520ACBZA* 6520 ACBZ (Note) ISL6520AIB* 6520 AIB ISL6520AIBZ* 6520 AIBZ (Note) ISL6520ACR* 65 20ACR ISL6520ACRZ* 65 20ACRZ (Note) ISL6520AIR* 65 20AIR ISL6520AIRZ * 65 20AIRZ (Note) ISL6520EVAL1 Evaluation Board *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 ...

Page 3

Block Diagram + 0. COMP/OCSET 20μA Typical Application R OCSET COMP/OCSET OFFSET 3 ISL6520A + SAMPLE AND - OC HOLD COMPARATOR PWM ERROR COMPARATOR AMP + + - - OSCILLATOR FIXED 300kHz V ...

Page 4

Absolute Maximum Ratings Supply Voltage +6.0V CC ...

Page 5

Functional Pin Description VCC This pin provides the bias supply for the ISL6520A, as well as the lower MOSFET’s gate. Connect a well-decoupled 5V supply to this pin. FB This pin is the inverting input of the internal error amplifier. ...

Page 6

OUTPUT INDUCTOR CURRENT 5A/DIV. TIME (5ms/DIV.) FIGURE 1. OVERCURRENT OPERATION The overcurrent function will trip at a peak inductor current (I determined by: PEAK OCSET OCSET I = ---------------------------------------------------- - PEAK where ...

Page 7

V IN ISL6520A UGATE Q 1 PHASE Q 2 LGATE RETURN FIGURE 3. PRINTED CIRCUIT BOARD POWER AND GROUND PLANES OR ISLANDS Figure 3 shows the critical power components of the converter. To minimize the voltage overshoot, the interconnecting wires ...

Page 8

ND 5. Place 2 Pole at Half the Switching Frequency. 6. Check Gain against Error Amplifier’s Open-Loop Gain. 7. Estimate Phase Margin - Repeat if Necessary. Compensation Break Frequency Equations ----------------------------------- - F = -------------------------------------------------------- - Z1 ...

Page 9

TRAN RISE FALL OUT where the transient load current step, t TRAN ...

Page 10

ISL6520A DC/DC Converter Application Circuit Figure 8 shows an application circuit of a DC/DC Converter. Detailed information on the circuit, including a complete +5V 6.19kΩ COMP/OCSET 10.0kΩ 470pF 8200pF FB 1.00kΩ Component Selection Notes Each 330mF 6.3WVDC, Sanyo ...

Page 11

Small Outline Plastic Packages (SOIC) N INDEX 0.25(0.010) H AREA E - SEATING PLANE - -C- α 0.10(0.004) 0.25(0.010 NOTES: 1. Symbols are defined in the ...

Page 12

... Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use ...

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