Intersil ISL8014AEVAL2Z Installation and operating instructions

1
Application Note 1366
ISL8014AEVAL2Z: 4A Low Quiescent Current 1MHz
High Efficiency Synchronous Buck Regulator
Description
The ISL8014AEVAL2Z kit is intended for use by
individuals with requirements for Point-of-Load
applications sourcing from 2.7V to 5.5V. The
ISL8014AEVAL2Z evaluation board demonstrates the
performance of the ISL8014A low quiescent current
mode converter.
The ISL8014A is offered in a 4mmx4mm 16 Ld QFN
package with 1mm maximum height. The ISL8014A is
pin-to-pin compatible to the ISL8013A. The complete
converter occupies less than 0.4in2area.
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
• 4A 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
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
• 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 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 VOUT
Evaluating the Other Output Voltage
The ISL8014AEVAL2Z kit output is preset to 1.8V;
however, output voltages can be adjusted from 0.8V to
3.3V using Equations 1 and 2:
Let’s set R1 = 124kΩ
Note: If desired output is 0.8V, then short R1and open
R2.
Mode Control
The ISL8014A 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 situations require the
ISL8014A 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
SW1 ENABLE ON/OFF CONTROL
1OFFDisableV
OUT
3ONEnableV
OUT
SW2 SKIP FUNCTION
1 PWM Fixed PWM frequency at light load
3 PFM Force continuous mode
VOUT 0.8 1 R1
R2
-------
+
⎝⎠
⎜⎟
⎛⎞
=(EQ. 1)
R2R1
()
VOUT
0.8
----------------
⎝⎠
⎛⎞
1–
-------------------------------
=(EQ. 2)
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.
December 16, 2009
AN1366.3

2AN1366.3
December 16, 2009
ISL8014AEVAL2Z Schematic
VIN
OFFPFM
PWM
SW2
D1
SW1
VIN
J1
2
1
1
VDD
A
A
VIN
R5
2k
2
21
31 2N7002
Q1
2
PG1
P3
R4
100k
1
2
2
R6
100k
SYNCH
P2 1
1
2
R9
OPEN
3
1
A
1
2
VIN
2
R7
100k
EN 1
1
P6 2
R8
OPEN
3ON
1
A
1
P4
P5
1
C1
22µF C2 22µF
1
1
22
1
A
2
1
2
3
4
EN PG
SYNCH
VIN
VIN
SYNCH
6
A
PGND
PGND
SGND
SGND
1
2
43
U1
A
12
11
10
9
LX
A
L1
2
1.5µH
2
R1
124k
1
C4
47pF
1
2
1
C5
22µF
2
R2
100k
1
A
J2
P7
P8
1
1
C6
22µF
2
43
NC LX LX NC
VOUT
1
578
13141516
NC FB
C3
OPEN2
1
1
2
A
EP
17
R10
NOTE: Pins 13 and 16 are no connect pins which can tie to VIN, SGND, or LX.
Recommend connecting pin 13 to LX for compatibility to ISL8013.
ISL8014AIRZ
Application Note 1366

3AN1366.3
December 16, 2009
ISL8014AEVAL2Z Bill of Materials
PART NUMBER QTY REFERENCE DESIGNATOR DESCRIPTION MANUFACTURER MANUFACTURER PART
ISL8014AEVAL2Z 1 PWB-PCB, ISL8014AEVAL2Z,
REVA, ROHS ISL8014AEVAL2ZREVAPCB
H1045-00470-50V5-T 1 C4 CAP, SMD, 0603, 47pF, 50V, 5%,
NPO, ROHS AVX 06035A470JAT2A
PHILLIPS 0603X7R500-562KNE
H1045-DNP 0 C3 CAP, SMD, 0603, DNP-PLACE
HOLDER, ROHS
H1065-00226-6R3V10-T 4 C1, C2, C5, C6 CAP, SMD, 1206, 22µF, 6.3V,
10%, X5R, ROHS MURATA GRM31CR60J226KE19L
KEMET C1206C226K9PACTU
AVX 12066D226KAT2A
DR73-1R5-R 1 L1 COIL-PWR INDUCTOR, SMD,
7.5mm, 1.5µH, 20%, 6.52A,
ROHS
COOPER ELECTRONIC
TECH. DR73-1R5-R
131-4353-00 2 J1, J2 CONN-SCOPE PROBE TEST PT,
COMPACT, PCB MNT, ROHS TEKTRONIX 131-4353-00
1514-2 4 P4, P5, P7, P8 CONN-TURRET, TERMINAL POST,
TH, ROHS KEYSTONE 1514-2
5002 3 P2, P3, P6 CONN-MINI TEST POINT,
VERTICAL, WHITE, ROHS KEYSTONE 5002
LTST-C170CKT 1 D1 LED-GaAs RED, SMD,
2mmx1.25mm, 100mW, 40mA,
10mcd, ROHS
LITEON/VISHAY LTST-C170CKT
ROHM SML-210LTT86
STANLEY ELECTRIC BR112H-TR
ISL8014AIRZ 1 U1 IC-4A, 1MHz, BUCK REGULATOR,
16P, QFN, 4x4, ROHS INTERSIL ISL8014AIRZ
2N7002-7-F-T 1 Q1 TRANSISTOR, N-CHANNEL, 3LD,
SOT-23, 60V, 115mA, ROHS DIODES, INC. 2N7002-7-F
ON SEMICONDUCTOR 2N7002LT1G
H2511-00R00-1/10W-T 1 R10 RESISTOR, SMD, 0603, 0Ω,
1/10W, TF, ROHS
H2511-01003-1/10W1-T 4 R2, R4, R6, R7 RES, SMD, 0603, 100k, 1/10W,
1%, TF, ROHS
H2511-01243-1/10W1-T 1 R1 RES, SMD, 0603, 124k, 1/10W,
1%, TF, ROHS YAGEO 9C06031A1243FKHFT
PANASONIC ERJ-3EK1243V
H2511-02001-1/10W1-T 1 R5 RES, SMD, 0603, 2k, 1/10W, 1%,
TF, ROHS KOA RK73H1JTTD2001F
VENKEL CR0603-10W-2001FT
H2511-DNP 0 R8, R9 RES, SMD, 0603, DNP-PLACE
HOLDER, ROHS
GT11MSCBE-T 2 SW1, SW2 SWITCH-TOGGLE, SMD,
ULTRAMINI, 1P, SPST MINI C&K COMPONENTS GT11MSCKE
LABEL-SERIAL NUMBER 1 LABEL, FOR SERIAL NUMBER
AND BOM REV #
Application Note 1366

4AN1366.3
December 16, 2009
ISL8014AEVAL2Z Board Layout
FIGURE 1. TOP COMPONENTS
FIGURE 2. TOP LAYER ETCH
ISL8014AEVAL2Z
Application Note 1366

5AN1366.3
December 16, 2009
FIGURE 3. 2ND LAYER ETCH
FIGURE 4. 3RD LAYER ETCH
ISL8014AEVAL2Z Board Layout (Continued)
Application Note 1366

6
Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the
reader is cautioned to verify that the Application Note or Technical Brief is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
AN1366.3
December 16, 2009
FIGURE 5. BOTTOM LAYER COMPONENTS (MIRRORS)
FIGURE 6. BOTTOM LAYER ETCH (MIRROR)
ISL8014AEVAL2Z Board Layout (Continued)
Application Note 1366