ISL6420IAZ

Series: -
PWM Type: Voltage Mode
Buck: Yes
Inverting: No
Doubler: No
Divider: No
Cuk: No
Isolated: No
Number of Outputs: 1
Duty Cycle: 100%
Operating Temperature: -40°C ~ 85°C
Packaging: Tube
Boost: No
Flyback: No
Voltage - Supply: 4.5 V ~ 16 V
Manufacturer: Intersil
Frequency - Max: 1.4MHz
Package / Case: 20-SSOP (0.154", 3.90mm Width)


Features:

•Operates from 4.5V to 16V Input
•Excellent Output Voltage Regulation  -0.6V Internal Reference  -±1.0% Reference Accuracy Over Line and Temperature
•Resistor-Selectable Switching Frequency  -100kHz to 1.4MHz
•Voltage Margining and External Reference Tracking Modes
•Output Can Sink or Source Current
•Lossless, Programmable Overcurrent Protection -Uses Upper MOSFET's rDS(ON)
•Programmable Soft-Start
•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
•Extensive Circuit Protection Functions -PGOOD, overvoltage, overcurrent, Shutdown
•QFN (4x4) Package -QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad  Flat No Leads - Product Outline  -QFN Near Chip Scale Package Footprint; Improves  PCB Efficiency, Thinner in Profile
•Also Available in QSOP Package
•Pb-Free Plus Anneal Available (RoHS Compliant)


Application

•Power Supplies for Microprocessors/ASICs  -Embedded Controllers -DSP and Core Processors  -DDR SDRAM Bus Termination
•Ethernet Routers and Switchers
•High-Power DC/DC Regulators
•Distributed DC/DC Power Architecture
•Personal Computer Peripherals
•Externally Referenced Buck Converters


Pinout




Specifications

Absolute Maximum Ratings (Note 1)
Bias Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+18V
BOOT and Ugate Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +24V
ESD Classification
Human Body Model (Per MIL-STD-883 Method 3015.7) . . 1500V
Charged Device Model (Per EOS/ESD DS5.3, 4/14/93) . . 2000V

Thermal Information
Thermal Resistance (Typical)                   JA (°C/W)       JC (°C/W)
QFN Package (Notes 2, 3). . . . . . . . . .47                               8.5
QSOP Package (Note 2) . . . . . . . . . . .90                               NA
Maximum Junction Temperature (Plastic Package)  . . . . . . . .150°C
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

Description

  The ISL6420IAZ makes simple work out of implementing a complete control and protection scheme for a high-performance DC/DC buck converter. Designed to drive N-channel MOSFETs in a synchronous rectified buck topology, the ISL6420IAZ 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 ISL6420IAZ 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, with a maximum tolerance of ±1.0% over temperature and line voltage variations.

   The operating frequency of ISL6420IAZ  is fully adjustable from 100kHz to 1.4MHz. High frequency operation offers cost and space savings.

   The error amplifier ISL6420IAZ  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 ISL6420IAZ  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 providedbymonitoring the rDS(ON) of the upper MOSFET to inhibit the PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sensing resistor.  

Parameters:

Technical/Catalog Information	ISL6420IAZ
Vendor	Intersil
Category	Integrated Circuits (ICs)
PWM Type	Voltage Mode
Number of Outputs	1
Package / Case	20-QSOP (SSOP)
Packaging	Tube
Duty Cycle	100%
Voltage - Supply	4.5 V ~ 18 V
Frequency-Max	1.4MHz
Buck	Yes
Boost	No
Flyback	No
Inverting	No
Doubler	No
Divider	No
Cuk	No
Isolated	No
Drawing Number	*
Lead Free Status	Lead Free
RoHS Status	RoHS Compliant
Other Names	ISL6420IAZ ISL6420IAZ