ISL6420BIRZ-TK Intersil, ISL6420BIRZ-TK Datasheet

IC CTRLR PWM SYNC BUCK 20-QFN

ISL6420BIRZ-TK

Manufacturer Part Number
ISL6420BIRZ-TK
Description
IC CTRLR PWM SYNC BUCK 20-QFN
Manufacturer
Intersil
Datasheet

Specifications of ISL6420BIRZ-TK

Pwm Type
Voltage Mode
Number Of Outputs
1
Frequency - Max
1.4MHz
Duty Cycle
100%
Voltage - Supply
4.5 V ~ 28 V
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Operating Temperature
-40°C ~ 85°C
Package / Case
20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
Frequency-max
1.4MHz
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Advanced Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller
ISL6420B
The ISL6420B simplifies the implementation of a
complete control and protection scheme for a
high-performance DC/DC buck converter. It is designed
to drive N-Channel MOSFETs in a synchronous rectified
buck topology. The ISL6420B integrates control, output
adjustment, monitoring and protection functions into a
single package. Additionally, the IC features an external
reference voltage tracking mode for externally
referenced buck converter applications and DDR
termination supplies, as well as a voltage margining
mode for system testing in networking DC/DC converter
applications.
The ISL6420B provides simple, single feedback loop,
voltage mode control with fast transient response. The
output voltage of the converter can be precisely
regulated to as low as 0.6V.
The operating frequency is fully adjustable from 100kHz
to 1.4MHz. High frequency operation offers cost and
space savings.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate that enables high converter
bandwidth for fast transient response. The PWM duty
cycle ranges from 0% to 100% in transient conditions.
Selecting the capacitor value from the ENSS pin to
ground sets a fully adjustable PWM soft-start. Pulling the
ENSS pin LOW disables the controller.
The ISL6420B monitors the output voltage and
generates a PGOOD (power good) signal when soft-start
sequence is complete and the output is within regulation.
A built-in overvoltage protection circuit prevents the
output voltage from going above typically 115% of the
set point. Protection from overcurrent conditions is
provided by monitoring the r
to inhibit the PWM operation appropriately. This approach
simplifies the implementation and improves efficiency by
eliminating the need for a current sensing resistor.
December 4, 2009
FN6901.1
1
DS(ON)
of the upper MOSFET
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Operates From:
• 0.6V Internal Reference Voltage
• Resistor-Selectable Switching Frequency
• Voltage Margining and External Reference Tracking
• Output can Sink or Source Current
• Lossless, Programmable Overcurrent Protection
• Programmable Soft-Start
• Drives N-Channel MOSFETs
• Simple Single-Loop Control Design
• Fast Transient Response
• Extensive Circuit Protection Functions
• Diode Emulation during Startup for Pre-Biased Load
• Offered in 20 Ld QFN and QSOP Packages
• QFN (4x4) Package
• Pb-Free (RoHS Compliant)
Applications
• Power Supplies for Microprocessors/ASICs
• Ethernet Routers and Switchers
• High-Power DC/DC Regulators
• Distributed DC/DC Power Architecture
• Personal Computer Peripherals
• Externally Referenced Buck Converters
- 4.5V to 5.5V Input
- 5.5V to 28V Input
- ±2.0% Reference Accuracy
- 100kHz to 1.4MHz
Modes
- Uses Upper MOSFET’s r
- Voltage-Mode PWM Control
- High-Bandwidth Error Amplifier
- Full 0% to 100% Duty Cycle
- PGOOD, Overvoltage, Overcurrent, Shutdown
Applications
- QFN compliant to JEDEC PUB95 MO-220
- QFN Near Chip Scale Package Footprint; Improves
- Embedded Controllers
- DSP and Core Processors
- DDR SDRAM Bus Termination
All other trademarks mentioned are the property of their respective owners.
QFN -Quad Flat No Leads - Product Outline
PCB Efficiency, Thinner in Profile
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
DS(ON)

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ISL6420BIRZ-TK Summary of contents

Page 1

... Externally Referenced Buck Converters CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. | 1-888-INTERSIL or 1-888-468-3774 Intersil (and design registered trademark of Intersil Americas Inc. All other trademarks mentioned are the property of their respective owners. DS(ON) Copyright Intersil Americas Inc. 2009. All Rights Reserved ...

Page 2

... MARKING ISL6420BIAZ 6420B IAZ ISL6420BIAZ-TK (Note 1) 6420B IAZ ISL6420BIRZ 64 20BIRZ ISL6420BIRZ-TK (Note 1) 64 20BIRZ NOTES: 1. Please refer to TB347 for details on reel specifications. 2. These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations) ...

Page 3

Block Diagram REFOUT INTERNAL 0.6V GPIO1/REFIN SSDONE VOLTAGE GPIO2 MARGINING CONTROL VMSET/MODE CDEL FB COMP PGOOD PGOOD COMP VCC5 ENSS 10µA POWER-ON ENSS RESET (POR) SSDONE FAULT LOGIC PWM SS COMP V REF EA OSCILLATOR OV/UV COMP SGND RT VIN ...

Page 4

Typical 5V Input DC/DC Application Schematic 5V ±10 VIN ENSS RT PGOOD 0.1µF CDEL C 8 SGND Typical 5.5V to 28V Input DC/DC Application Schematic 5.5V to ...

Page 5

Typical 5V Input DC/DC Application Schematic 5V ±10 VIN ENSS RT CDEL PGOOD REF SGND CONFIGURATION FOR DDR TERMINATION/EXTERNALLY REFERENCED TRACKING APPLICATIONS Typical ...

Page 6

Typical 5V Input DC/DC Application Schematic 5V ±10 VIN ENSS RT PGOOD CDEL 0.1µ SGND Typical 5.5V to 28V Input DC/DC Application Schematic ...

Page 7

... Maximum Storage Temperature Range . . . -65°C to +150°C Ambient Temperature Range . -40°C to +85°C (for “I” suffix) Junction Temperature Range . . . . . . . . . . -40°C to +125°C Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp TEST CONDITIONS ENSS = GND VIN = VCC5 for 5V configuration VIN = 5.6V to 28V, I ...

Page 8

Electrical Specifications Operating Conditions: VIN = 12V, PVCC shorted with VCC5, T apply over the operating temperature range, -40°C to +85°C. (Continued) PARAMETER SYMBOL Ramp Amplitude (Note 10) ΔV REFERENCE AND SOFT-START/ENABLE Internal Reference Voltage V Soft-Start Current Soft-Start Threshold ...

Page 9

Electrical Specifications Operating Conditions: VIN = 12V, PVCC shorted with VCC5, T apply over the operating temperature range, -40°C to +85°C. (Continued) PARAMETER SYMBOL Buffered Output Voltage - V REFOUT External Reference Buffered Output Voltage - V REFOUT External Reference ...

Page 10

Typical Performance Curves 0.604 0.602 0.600 0.598 0.596 0.594 -40 -15 10 TEMPERATURE (°C) FIGURE TEMPERATURE REF 1.15 1.05 0.95 0.85 -40 -15 10 TEMPERATURE (°C) FIGURE TEMPERATURE OCSET +25°C, VIN = 28V, I ...

Page 11

Typical Performance Curves FIGURE 7. EFFICIENCY vs LOAD CURRENT (V Pin Descriptions VIN This pin powers the controller and must be decoupled to ground using a ceramic capacitor as close as possible to the VIN pin. TABLE 1. INPUT SUPPLY ...

Page 12

CDEL The PGOOD signal can be delayed by a time proportional to a CDEL current of 2µA and the value of the capacitor connected between this pin and ground. A 0.1µF will typically provide 125ms delay. When in the Voltage ...

Page 13

TABLE 3. VOLTAGE MARGINING CONTROLLED BY GPIO1 AND GPIO2 GPIO1 GPIO2 Functional Description Initialization The ISL6420B automatically initializes upon receipt of power. The Power-On Reset (POR) function monitors the internal bias voltage ...

Page 14

The maximum r at the highest junction DS(ON) temperature. 2. Determine > I for OUT MAX where ΔI is the output inductor ripple current. A small ceramic capacitor should be placed in parallel with ...

Page 15

The slew time of the current is set by an external capacitor on the CDEL pin, which is charged and discharged with a 100µA current source. The change in voltage on the capacitor is 2.5V. This same capacitor is used ...

Page 16

V = 12V 3.3V at 25mA LOAD IN OUT FIGURE 14. PREBIASED OUTPUT AT 25mA LOAD Application Guidelines Layout Considerations As in any high frequency switching converter, layout is very important. Switching current from one power device to ...

Page 17

VIN OSC DRIVER PWM COMPARATOR DRIVER - + ΔV OSC E REFERENCE ERROR AMP DETAILED COMPENSATION COMPONENTS COMP ISL6420B REF ⎛ × ...

Page 18

The compensation gain uses external impedance networks Z and Z to provide a stable, high FB IN bandwidth (BW) overall loop. A stable control loop has a gain crossing with -20dB/decade slope and a phase margin greater than 45°. Include ...

Page 19

– RMS MAX For a through hole design, several electrolytic capacitors (Panasonic HFQ series or Nichicon PL series or Sanyo MV-GX ...

Page 20

Package Outline Drawing L20.4x4 20 LEAD QUAD FLAT NO-LEAD PLASTIC PACKAGE Rev 1, 11/06 4.00 6 PIN 1 INDEX AREA 0.15 (4X) TOP VIEW ( 3. 6 TYP ) ( TYPICAL RECOMMENDED LAND PATTERN 20 ISL6420B 16X ...

Page 21

... 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; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries ...

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