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Application Note 1587
Author: Huong Doan
ISL8022EVAL2Z Dual 2A/1.7A Low Quiescent
Current 2.25MHz High Efficiency Synchronous Buck
Regulator
Description
TABLE 1. BILL OF MATERIALS
The ISL8022EVAL2Z kit is intended for use by
individuals with requirements for Point-of-Load
applications sourcing from 2.8V to 5.5V. The
ISL8022EVAL2Z evaluation board is used to demonstrate
the performance of the ISL8022 low quiescent current
REFERENCE
DESIGNATOR DESCRIPTION
PWB-PCB,
ISL8022EVAL2Z,
REVA, ROHS
MFR
TBD
MFR PART
ISL8022EVAL2ZREVAPCB
mode converter.
The ISL8022 is offered in a 4mmx3mm 12 Ld DFN
package with 1mm maximum height. The complete
converter occupies less than 0.175in 2 area.
Key Features
C2, C4
C1, C8
CAP, SMD, 0805, TDK
22μF, 6.3V, 20%,
X5R, ROHS
CAPACITOR, MURATA
SMD, 0805,
10μF, 6.3V, 10%,
X5R
C2012X5R0J226M
GRM21BR60J106KE01L
? Dual 2A/1.7A High Efficiency Synchronous Buck
Regulator with up to 97% Efficiency
? 180° Out-of-Phase
? Power-Goods (PG) Output with 1ms Delay
? 2.8V to 5.5V Supply Voltage
? 3% Output Accuracy Over-temperature/Load/Line
C6, C7
C3, C5
CAP, SMD, 0805,
DNP-PLACE
HOLDER, ROHS
CAP-RF HIQ,
SMD, 0402,
10pF, 50V, 5%,
COG, ROHS
JOHANSON 500R07S100JV4T
TECH.
? Start-up with Pre-biased Output
? 40μA Quiescent Supply Current in PFM Mode
? Selectable Forced PWM Mode and PFM Mode
? External Synchronization up to 8MHz
L1, L2
COIL-PWR
INDUCTOR, WW,
SMD, 4mm,
1.2μH, 30%,
2.7A, ROHS
TDK
VLCF4028T-1R2N2R7-2
YAGEO
RC0402FR-07200KL
VENKEL CR0402-16W-3163FT
? Typical 6.5μA Logic Controlled Shutdown Current
? 100% Maximum Duty Cycle for Lowest Dropout
? Internal Current Mode Compensation
? Peak Current Limiting, Hiccup Mode Short Circuit
Protection and Over-temperature Protection
? Negative Current Detection and Protection
Recommended Equipment
The following materials are recommended to perform
testing:
? 0V to 10V Power Supply with at least 3A source
current capability or 5V battery
? Electronic Loads capable of sinking current up to 3A
? Digital Multimeters (DMMs)
? 100MHz quad-trace oscilloscope
? Signal generator
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, the plus terminal to
VIN and the negative return to P1.
3. Turn on the power supply.
4. Verify the output voltage is 2.5V for V OUT1 and 1.8V
for V OUT2.
U1
R1, R3, R6
R5
R2
R9
IC-2A/1.7A INTERSIL ISL8022IRZ
BUCK
REGULATOR,
12P, DFN, 4X3,
ROHS
RES, SMD, 0402, PANASONIC ERJ2RKF1003
100k, 1/16W,
1%, TF, ROHS
RES, SMD, 0402, ROHM MCR01MZPF2003
200k, 1/16W,
1%, TF, ROHS
VISHAY/ CRCW0402200KFKED
DALE
VENKEL CR0402-16W-2003FT
RES, SMD, 0402, PANASONIC ERJ-2RKF3163X
316k, 1/16W,
1%, TF, ROHS
RES, SMD, 0402,
DNP, DNP, DNP,
TF, ROHS
August 10, 2010
AN1587.1
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. 2010. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
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