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PDF ISL8011 Data sheet ( Hoja de datos )
| Número de pieza | ISL8011 | |
| Descripción | High Efficiency Synchronous Buck Regulator | |
| Fabricantes | Intersil Corporation | |
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®
Data Sheet
August 4, 2009
ISL8011
FN9254.2
1.2A Integrated FETs, High Efficiency
Synchronous Buck Regulator
ISL8011 is an integrated FET, 1.2A synchronous buck
regulator for general purpose point-of load applications. It is
optimized for generating low output voltages down to 0.8V.
The supply voltage range is from 2.7V to 5.5V allowing the
use from common 3.3V or 5V supply rails and Lithium ion
battery inputs. It has guaranteed minimum output current of
1.2A. 1.5MHz pulse-width modulation (PWM) switching
frequency allowing the use of small external components.
The ISL8011 includes a pair of low ON-resistance P-Channel
and N-Channel internal MOSFETs to maximize efficiency
and minimize external component count. 100% duty-cycle
operation allows less than 200mV dropout voltage at 1.2A.
The ISL8011 offers a 200ms Power-On-Reset (POR) timer
at power-up. When shutdown, the ISL8011 discharges the
output capacitor. Other features include internal digital
soft-start, enable for power sequence, overcurrent
protection, and thermal shutdown.
The ISL8011 is offered in a 10 Ld 3mmx3mm DFN package
with 1mm maximum height. The complete converter
occupies less than 1cm2 area.
Ordering Information
PART
NUMBER
(Note)
TEMP.
PART RANGE
MARKING (°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL8011IRZ 011Z
-40 to +85 10 Ld 3x3 DFN L10.3x3C
ISL8011IRZ-T* 011Z
-40 to +85 10 Ld 3x3 DFN L10.3x3C
Tape and Reel
*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.
Features
• High Efficiency Synchronous Buck Regulator with Up to
95% Efficiency
• 2.7V to 5.5V Supply Voltage
• 1.2A Output Current
• 100% Maximum Duty Cycle
• Peak Current Limiting, Short Circuit Protection
• 200ms Power-On Reset
• 3% Output Accuracy Over-Temperature/Load/Line
• Less than 1µA Logic Controlled Shutdown Current
• Internal Loop Compensation
• Internal Digital Soft-Start
• Over-Temperature Protection
• Enable
• Small 10 Ld 3mmx3mm DFN
• Pb-Free (RoHS Compliant)
Applications
• DC/DC POL Modules
• µC/µP, FPGA and DSP Power
• Plug-in DC/DC Modules for Routers and Switchers
• Portable Instruments
• Test and Measurement Systems
Pinout
ISL8011
(10 LD 3x3 DFN)
TOP VIEW
PVIN 1
VCC 2
EN 3
POR 4
GND 5
10 PHASE
9 PGND
8 SGND
7 FB
6 N/C
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2006, 2007, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL8011
Typical Operating Performance (Continued)
VOUT
VPHASE
IO
IL
FIGURE 9. LOAD TRANSIENT (VIN = 3.6V; VO = 1.6V; IO = 0A TO ~1A)
Pin Descriptions
PVIN
Input supply voltage. Connect a 10µF ceramic capacitor to
power ground.
VCC
Supply voltage for internal analog and digital control circuits,
delivered from PVIN. Bypass with 0.1µF ceramic capacitor to
signal ground.
EN
Regulator enable pin. Force this pin above 1.4V enable the
chip. Force this pin below 0.4V shutdown the chip and
discharge output capacitor when driven to low. Do not leave
this pin floating.
POR
200ms timer output. At power-up or EN HI, this output is a
200ms delayed Power-Good signal for the output voltage.
GND
Ground. Connect this pin to the exposed pad and SGND.
PHASE
Switching node connection. Connect to one terminal of
inductor.
PGND
Power ground. Connect all power grounds to this pin.
SGND
Analog ground. SGND and PGND should only have one
point connection.
FB
Buck regulator output feedback. Connect to the output
through a resistor divider for adjustable the output voltage.
Exposed Pad
The exposed pad must be connected to the PGND pin for
proper electrical performance and optimal thermal
performance.
NC
NC is the No Connect pin. Tie this pin to SGND to prevent
noise.
5 FN9254.2
August 4, 2009
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ISL8011.PDF ] | |
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