ISL8500IRZ Intersil, ISL8500IRZ Datasheet

IC PWM REG 2A BUCK 12-DFN

ISL8500IRZ

Manufacturer Part Number
ISL8500IRZ
Description
IC PWM REG 2A BUCK 12-DFN
Manufacturer
Intersil
Type
Step-Down (Buck), PWM - Voltage Moder
Datasheet

Specifications of ISL8500IRZ

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
0.6 ~ 19 V
Current - Output
2A
Frequency - Switching
500kHz
Voltage - Input
4.5 ~ 25 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
*
Package / Case
12-DFN
Voltage - Supply
4.5 V ~ 25 V
Frequency-max
550kHz
Duty Cycle
94%
Pwm Type
Voltage Mode
Buck
Yes
Boost
No
Flyback
No
Inverting
No
Doubler
No
Divider
No
Cuk
No
Isolated
No
Rohs Compliant
YES
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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2A Standard Buck PWM Regulator
The ISL8500 is a high-performance, simple output controller
that provides a single, high frequency power solution for a
variety of point-of-load applications. The ISL8500 integrates
a 2A standard buck PWM controller and switching MOSFET.
The PWM controller in the ISL8500 drives an internal
switching N-Channel power MOSFET and requires an
external Schottky diode to generate an output voltage from
0.6V to 19V. The integrated power switch is optimized for
excellent thermal performance up to 2A of output current.
The standard buck input voltage range supports a fixed 5V
or variable 5.5V to 25V range. The PWM regulator switches
at a fixed frequency of 500kHz and utilizes simple voltage
mode control with input voltage feed forward to provide
flexibility in component selection and minimize solution size.
Protection features include overcurrent, undervoltage and
thermal overload protection integrated into the IC. The
ISL8500 power good signal output indicates loss of
regulation on the PWM output.
ISL8500 is available in a small 4mmx3mm Dual Flat No-Lead
(DFN) package.
Ordering Information
ISL8500IRZ
ISL8500IRZ-T* 500Z
*Please refer to TB347 for details on reel specifications.
NOTE: 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. Intersil Pb-free products are MSL
classified at Pb-free peak reflow temperatures that meet or exceed
the Pb-free requirements of IPC/JEDEC J STD-020.
NUMBER
(Note)
PART
500Z
MARKING
PART
RANGE (°C)
®
-40 to +85
-40 to +85
TEMP.
1
Data Sheet
12 Ld DFN
12 Ld DFN
PACKAGE
(Pb-free)
L12.4x3
L12.4x3
DWG. #
PKG.
1-888-INTERSIL or 1-888-468-3774
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
Features
• Standard Buck Controller with Integrated Switching Power
• Integrated Boot Diode
• Input Voltage Range
• PWM Output Voltage Adjustable from 0.6V to 19V with
• ±1% VFB Tolerance
• Voltage Mode Control with Voltage Feed Forward
• Fixed 500kHz Switching Frequency
• Externally Adjustable Soft-Start Time
• Output Undervoltage Protection
• Enable Inputs
• PGOOD Output
• Overcurrent Protection
• Thermal Overload Protection
• Internal 5V LDO regulator
Applications
• General Purpose
• WLAN Cards-PCMCIA, Cardbus32, MiniPCI Cards-Compact
• Hand-Held Instruments
• LCD Panel
• Set-top Box
Pinout
December 10, 2007
MOSFET
- Fixed 5V ±10%
- Variable 5.5V to 25V
Continuous Output Current up to 2A
Flash Cards
All other trademarks mentioned are the property of their respective owners.
COMP
|
GND
Intersil (and design) is a registered trademark of Intersil Americas Inc.
EN
PG
FB
SS
1
2
3
4
5
6
Copyright © Intersil Americas Inc. 2007. All Rights Reserved
GND
(12 LD DFN)
TOP VIEW
ISL8500
DFN 4x3
12
10
11
9
8
7
ISL8500
VIN
VIN
PHASE
PHASE
BOOT
VDD
FN6611.0

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ISL8500IRZ Summary of contents

Page 1

... MARKING RANGE (°C) ISL8500IRZ 500Z -40 to +85 ISL8500IRZ-T* 500Z -40 to +85 *Please refer to TB347 for details on reel specifications. NOTE: 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 2

Typical Application Schematic EN PG GND 2 ISL8500 R3 C3 301 100pF 10k 2.2nF 3.16k C1 10pF R2 C5 51.1k 0.1 μ F VIN PHASE ISL8500 BOOT VDD FIGURE 1. VIN RANGE FROM 5.5V TO 25V VOUT ...

Page 3

Functional Block Diagram VDD SOFT-START CONTROL 30µ VIN LDO VDD PG 3 ISL8500 VOLTAGE - + MONITOR EA 0.6V RAMP REFERENCE GENERATOR FAULT THERMAL MONITOR MONITOR OSCILLATOR +150°C OC MONITOR VDD POWER-ON RESET MONITOR EPAD GND VDD OC ...

Page 4

... Thermal Information Thermal Resistance QFN Package (Notes 1, 2 Ambient Temperature Range .-40°C to +85°C Junction Temperature Range .-40°C to +125°C Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . .see link below http://www.intersil.com/pbfree/Pb-FreeReflow.asp SYMBOL TEST CONDITIONS VIN VIN connected to VDD I Note 3 ...

Page 5

Electrical Specifications Unless Otherwise Noted, All Parameter Limits are Established Over the Recommended Operating Conditions and the Typical Specifications are Measured at the Following Conditions 5.5V to 25V, Unless Otherwise Noted. Typical Values are ...

Page 6

Pin Descriptions FB (Pin 1) and COMP (Pin 2) The standard buck regulator employs a single voltage control loop the negative input to the voltage loop error amplifier. COMP is the output of the error amplifier. The output ...

Page 7

Typical Performance Curves 100 1.5V OUT 1.2V OUT 3.3V OUT 30 20 0.0 0.5 1.0 OUTPUT LOAD (A) FIGURE 2. EFFICIENCY vs LOAD, 5V 100 12V OUT 90 5V OUT 1.5V ...

Page 8

Typical Performance Curves 1.814 1.813 25V IN 12V 1.812 IN 1.811 1.810 1.809 5V 1.808 IN 1.807 1.806 0.0 0.5 1.0 OUTPUT LOAD (A) FIGURE 8. V REGULATION vs LOAD, 1.8V OUT 3.330 3.328 25V IN 12V IN 3.326 3.324 ...

Page 9

Typical Performance Curves PHASE 10V/DIV IL 1A/DIV FIGURE 14. LOAD TRANSIENT (200µs/DIV) EN 5V/DIV IL 1A/DIV FIGURE 16. SOFT-START AT FULL LOAD (2ms/DIV) VOUT 1V/DIV IL 2A/DIV PG 5V/DIV FIGURE 18. OUTPUT SHORT CIRCUIT (5µs/DIV) 9 ISL8500 Unless otherwise noted, ...

Page 10

Detailed Description The ISL8500 combines a standard buck PWM controller with an integrated switching MOSFET. The buck controller drives an internal N-Channel MOSFET and requires an external diode to deliver load current up to 2A. A Schottky diode is recommended ...

Page 11

Output Voltage Selection The regulator output voltages can be programmed using external resistor dividers that scale the voltage feedback relative to the internal reference voltage. The scaled voltage is fed back to the inverting input of the error amplifier; refer ...

Page 12

These requirements are generally met with a mix of capacitors and careful layout. Embedded processor systems are capable of producing transient load rates above 1A/ns. High frequency capacitors initially supply the transient and slow the current load ...

Page 13

These capacitors must be capable of handling the surge-current at power-up. Some capacitor series available from reputable manufacturers are surge current tested. DRIVER OSC PWM COMPARATOR - ΔV + OSC ...

Page 14

A more detailed explanation of voltage mode control of a buck regulator can be found in TB417, entitled “Designing Stable Compensation Networks for Single Phase Voltage Mode Buck Regulators.” Layout Considerations Layout is very important in high frequency switching converter ...

Page 15

... 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 ...

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