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ISL8088EVAL2Z Evaluation Board User Guide
Dual 800mA Low Quiescent Current High Efficiency
Synchronous Buck Regulator-Small Form Factor
Description
The ISL8088EVAL2Z is intended for use by individuals with
requirements for Point-of-Load applications sourcing from
2.75V to 5.5V. The ISL8088EVAL2Z board is used to
demonstrate the performance of the ISL8088
low quiescent
current mode converter.
The ISL8088 is offered in a 3mmx3mm 10 Ld DFN package
with 1mm maximum height. The complete converter occupies
less than 77.419mm
2
area.
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, plus terminal to VIN and
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.
Key Features
• Dual 800mA high efficiency synchronous buck regulator
with up to 97% efficiency
• 800mA guaranteed output current per channel
• Power-Goods (PG) output with 1ms delay
• 2.75V to 5.5V supply voltage
• 3% output accuracy over temperature/load/line
• Start-up with prebiased output
• Internal digital soft-start - 2ms
• Soft-stop output discharge while disabled
• 30µA quiescent supply current in PFM mode
• Selectable forced PWM mode and PFM mode
• External synchronization up to 4MHz
• Typical 6.5µA logic controlled shutdown current
• 100% maximum duty cycle for lowest dropout
• Internal current mode compensation
• Peak current limiting
• Over temperature protection
• Independent enable
Ordering Information
PART NUMBER DESCRIPTION
ISL8088EVAL2Z ISL8088 small form factor evaluation
board
Note: Please keep FB1, FB2 pins traces short
FIGURE 1. ISL8088EVAL2Z SCHEMATIC
NC
VIN
PFM
R1
100k
SYNC
R9
OPEN
PWM
VOUT1
P2
PGND1
R3
100k
R2
316k
C2
10µF
2.2µH
12
L1
C3
10PF
A
A
R6
100k
R5
200k
C5
10PF
C4
10µF
C7
OPEN
VOUT2
P1
VIN
FB1
FB2
EN1
EN2
VIN
PG
LX1
LX2
SYNCH
EP
U1
1
2
3
4
5
11
10
9
8
7
6
VOUT2
C8
10µF
A
A
A
A
A
L2
12
2.2µH
ISL8088IRZ
C5
OPEN
C1
10µF
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Copyright Intersil Americas LLC 2010, 2013, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
July 15, 2016
AN1600.2
User Guide AN1600
Verzeichnis
