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Application Note 1365
ISL8013AEVAL2Z: 3A Low Quiescent Current 1MHz
High Efficiency Synchronous Buck Regulator
? R 1 ?
V OUT = 0.8 ? 1 + ------- ?
R 2 = -------------------------------
V OUT
? ---------------- ? – 1
Description
The ISL8013AEVAL2Z kit is intended for use by
individuals with requirements for Point-of-Load
applications sourcing from 2.7V to 5.5V. The
ISL8013AEVAL2Z evaluation board is used to
demonstrate the performance of the ISL8013A low
quiescent current mode converter.
The ISL8013A is offered in a 4mmx4mm 16 Ld QFN
package with 1mm maximum height. The complete
converter occupies less than 0.4in 2 area. The ISL8014A
is pin-to-pin compatible with the ISL8013A.
Key Features
? High Efficiency Synchronous Buck Regulator with up
to 95% Efficiency
? Power-Good (PG) Output with 1ms Delay
? 2.7V to 5.5V Supply Voltage
? 3% Output Accuracy Over-Temperature/Load/Line
? 3A Guaranteed Output Current
? Start-up with Pre-biased Output
? Internal Digital Soft-Start - 1ms
? Soft-Stop Output Discharge During Disabled
? 35μA Quiescent Supply Current in PFM Mode
? Selectable Forced PWM Mode and PFM Mode
? External Synchronization up to 4MHz
? Less than 1μA Logic Controlled Shutdown Current
? 100% Maximum Duty Cycle for Lowest Dropout
? Internal Current Mode Compensation
? Peak Current Limiting and Hiccup Mode Short Circuit
Protection
? Over-Temperature Protection
Quick Setup Guide
1. Ensure that the circuit is correctly connected to the
supply and loads prior to applying any power.
2. Connect the bias supply to VIN. Plus terminal to P4
(VIN) and negative return to P5 (GND).
3. Verify that position is ON for SW1.
4. Turn on the power supply.
5. Verify the output voltage is 1.8V for V OUT
Evaluating the Other Output Voltage
The ISL8013AEVAL2Z kit output is preset to 1.8V;
however, output voltages can be adjusted from 0.8V to
3.3V using Equations 1 and 2:
(EQ. 1)
? R 2 ?
Let’s set R 1 = 124k Ω
( R 1 )
(EQ. 2)
? 0.8 ?
Note: If desired output is 0.8V, then short R 1 and open
R 2 .
Mode Control
The ISL8013A has a SKIP pin that controls the operation
mode. When the SKIP pin is driven to low or shorted to
ground, the regulator operates in a PFM mode. Set SKIP
pin high forced PWM mode. The controller remains in the
fixed PWM frequency at light load instead of entering the
skip mode. In an application where a situation requires
the ISL8013A regulator to sink more than 2A valley
inductor current, it is recommended to operate in PFM to
avoid any possible over stress.
TABLE 1. SWITCH 1 SETTINGS
Recommended Equipment
The following materials are recommended to perform
testing:
? 0V to 10V Power Supply with at least 5A source
current capability or 5V battery
? Electronic Loads capable of sinking current up to 5A
? Digital Multimeters (DMMs)
? 100MHz quad-trace oscilloscope
SW1
1
3
SW2
1
3
ENABLE
OFF
ON
SKIP
PWM
PFM
ON/OFF CONTROL
Disable V OUT
Enable V OUT
FUNCTION
Fixed PWM frequency at light load
Force continuous mode
? Signal generator
December 16, 2009
AN1365.3
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. 2007, 2008, 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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