an1606

Application Note 1606
ISL8033EVAL1Z, ISL8033AEVAL1Z Dual 3A Low
Quiescent Current High Efficiency Synchronous Buck
Regulator
Description
Quick Setup Guide
The ISL8033EVAL1Z, ISL8033AEVAL1Z evaluation boards are
intended for use by individuals with requirements for
point of load applications sourcing from 2.85V to 6V. The
ISL8033EVAL1Z and ISL8033AEVAL1Z boards are used to
demonstrate the performance of the ISL8033 and ISL8033A
low quiescent current mode converters.
The ISL8033 and ISL8033A are offered in a 4mmx4mm 24 Ld
QFN package with 1mm maximum height. The complete
converter occupies less than 5.46cm2 area.
1. Ensure that the circuit is correctly connected to the supply
and loads prior to applying any power.
2. Connect the bias supply to VIN1, the plus terminal to VIN1
and the negative return to PGND1.
3. Verify that position is ON for SW2 and SW3.
4. Turn on the power supply.
5. Verify the output voltage is 1.8V for VOUT1 and 1.8V for
VOUT2.
Evaluating the Other Output Voltage
Key Features
• 2.85V to 6V supply voltage
The ISL8033EVAL1Z and ISL8033AEVAL1Z outputs are preset
to 1.8V for VOUT1 and 1.8V for VOUT2; however, output voltages
can be adjusted from 0.8V to 3.3V. The output voltage
programming resistor, R2 (or R5 in Channel 2), will depend on
the desired output voltage of the regulator. The value for the
feedback resistor is typically between 0Ω and 750kΩ as shown
in Equation 1.
• 2% output accuracy over temperature/load/line
Let’s set R3/R6 = 100kΩthen R2/R5 will be:,
• Start-up with pre-biased output
VOUT
R 2 = R 3  ------------------ – 1
 VFB

• Dual 3A high efficiency synchronous buck regulator with up
to 95% efficiency
• 180° out-of-phase
• Power-Good (PG) output with 1ms delay
• Internal digital soft-start - 1.5ms
• Soft-stop output discharge during disabled
(EQ. 1)
• Typical 8µA logic controlled shutdown current
If the output voltage desired is 0.8V, then leave R3
unpopulated and short R2. For faster response performance,
add 47pF in parallel to R2.
• 100% maximum duty cycle for lowest dropout
Mode Control
• Internal current mode compensation
The ISL8033 and ISL8033A have a SYNC pin. Connect to logic
high or input voltage VIN for PWM internal synchronization.
Connect to an external function generator for external
synchronization. Negative edge trigger. Do not leave this pin
floating. Do not tie this pin low (or to GND).
• External synchronization up to 6MHz
• Peak current limiting, hiccup mode short-circuit protection
and over-temperature protection
• Negative current detection and protection
Recommended Equipment
TABLE 1. SWITCH SETTINGS
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
May 12, 2016
AN1606.1
1
SW2, SW3
ENABLE
ON/OFF CONTROL
1
OFF
Disable VOUT
3
ON
Enable VOUT
Ordering Information
PART NUMBER
DESCRIPTION
ISL8033EVAL1Z
Dual 1MHz, 3A per channel non-current
sharing regulator evaluation board
ISL8033AEVAL1Z
Dual 2.25MHz, 3A per channel non-current
sharing regulator evaluation board
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, 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.
LX2_S
LX1_S
LX2B
VIN2
VIN2
VIN1
R_IN
LX1B
A
VIN2
A
VIN1
VIN1
VIN2A
VIN1A
0
CIN1
CIN2
22UF
PGND
19
20
21
22
PGND
A
23
A
22UF
24
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ISL8033EVAL1Z, ISL8033AEVAL1Z Schematics
PGND11A
2
L2
3
1.5UH
FBA
22UF
22UF
PFM
PGND1
#
PGND1
LX1
C11
C6
22UF
22UF
OPEN
C7
VOUT1B
OPEN
C1
C2
OPEN
OPEN
OPEN
A
CDC
OPEN
R7
OPEN
C_PH
PGND
A
12
11
10
9
A
100K
VOUT1_S
A
CD1
RF12
OPEN
124K
PGND1A
47PF
PGND
A
A
COMP
PGND2A
A
A
C10
A
FB1
RF21
A
8
7
A
124K
SYNC
PG1
A
R3
OPEN
A
VOUT1A
C9
FB1
PWM
UNNAMED_1_GT11MSCKE_I116_NC
A
R9
1
VOUT1
VOUT1
EN1
DNP
0
S1
ISET
EP
25
COMP
3
2
14
13
EN1
RF22
47PF
SYNC
R_PH
UNNAMED_1_SMRES_I163_A
SYNC
15
VDD
UNNAMED_1_ISL8033_I100_8
C5
SYNC
ISET
FB2
VOUT2
1.5UH
OPEN
VDD
ISL8033IRZ
PG2
NC
C4
EN2
R_OUT
L1
VIN1
16
VIN1
RF11
COMPA
100K
A
VDD
VDD
VIN_PG
A
R13
VIN_PG
R11
VIN1
OPEN
0
UNNAMED_1_SMCAP_I174_A
R4
R6
R8
100K
100K
2K
R12
3
EN1
2
SGND
S2
ON/EX
3
UNNAMED_1_GT11MSCKE_I115_NC
1
EN2
2
OFF
S3
1
2K
C8
UNNAMED_1_LTSTC170CKT_I83_A
OPEN
UNNAMED_1_LTSTC170CKT_I77_A
R10
ON/EX
UNNAMED_1_GT11MSCKE_I117_NC
OPEN
R14
D1
OPEN
A
OFF
D2
3
3
UNNAMED_1_2N7002_I85_D
SGND
PG2
EN2
EN1
EN1
EN2
EN1
A
Q1
1
PG2
EN2
UNNAMED_1_2N7002_I79_D
PG1
2
A
Q2
1
PG1
2
A
A
DRAWN BY:
NOTE:
PAUL ORFANU
RELEASED BY:
A
DATE:
ENGINEER:
03/06/2008
DATE:
UPDATED BY:
PLEASE KEEP COMP PIN TRACES SHORT (TO C8, R13)
TIM KLEMANN
ISL8033
DATE:
05/06/2008
TESTER
FIGURE 1. ISL8033EVAL1Z SCHEMATIC
1/19/08
TITLE:
TU BUI / PAUL ORFANU
PLEASE KEEP FB1, FB2 PINS TRACES SHORT
DATE:
PAUL ORFANU
DUAL 3A LOW IQ BUCK
USES: ISL8033_36EVAL1ZA
Application Note 1606
VOUT2_S
C3
CD2
VOUT2B
6
OPEN
ISET
SS
5
FB2
VOUT2A
VDD
4
PG2
VOUT2
VOUT2
0
0
R5
17
VIN1
U1
VIN2
SYNC
#
FB
R2
R1
100K
EN2
VIN2
PG1
VIN1
SGND
VDD
LX1
18
LX1
FB1
VDD
A
LX2
#
#
1
NC
2
LX2
PGND2
LX2
A
PGND2
PGND22A
AN1606.1
May 12, 2016
LX2_S
LX1_S
LX2B
VIN2
VIN2
VIN1
R_IN
LX1B
A
VIN2
A
VIN1
VIN1
VIN2A
VIN1A
0
CIN1
CIN2
22UF
PGND
19
20
21
24
PGND
A
22
A
22UF
23
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ISL8033EVAL1Z, ISL8033AEVAL1Z Schematics (Continued)
PGND11A
#
2
VIN1
3
L2
22UF
22UF
CD2
C4
1
PWM
C1
C2
OPEN
OPEN
OPEN
124K
A
CDC
OPEN
R7
OPEN
C_PH
PGND
A
LX1
PGND1
PGND1
12
11
10
9
A
C11
C6
22UF
22UF
OPEN
VOUT1B
C7
OPEN
SYNC
100K
VOUT1_S
CD1
RF12
OPEN
124K
A
C10
PGND1A
47PF
PGND
A
A
COMP
PGND2A
A
A
A
FB1
RF21
A
8
7
A
A
PG1
A
R3
OPEN
A
VOUT1A
C9
UNNAMED_1_ISL8033_I100_8
UNNAMED_1_GT11MSCKE_I116_NC
PFM
VOUT1
VOUT1
FB1
S1
ISET
EN1
DNP
0
VDD
14
EP
25
R9
3
2
15
13
EN1
COMP
SYNC
ISET
FB2
RF22
47PF
R_PH
UNNAMED_1_SMRES_I163_A
SYNC
OPEN
VDD
ISL8033AIRZ
PG2
NC
VOUT2_S
C3
6
EN2
VOUT2
L1
RF11
COMPA
100K
A
VDD
VDD
VIN_PG
A
R13
VIN_PG
R11
VIN1
OPEN
0
UNNAMED_1_SMCAP_I174_A
R4
R6
100K
100K
R8
R12
2K
3
EN1
2
SGND
S2
1
ON/EX
3
UNNAMED_1_GT11MSCKE_I115_NC
EN2
2
OFF
S3
1
2K
C8
UNNAMED_1_LTSTC170CKT_I83_A
OPEN
UNNAMED_1_LTSTC170CKT_I77_A
R10
ON/EX
UNNAMED_1_GT11MSCKE_I117_NC
OPEN
R14
D1
OPEN
A
OFF
D2
3
3
UNNAMED_1_2N7002_I85_D
SGND
EN2
EN1
EN1
EN2
EN1
A
PG2
Q1
1
PG2
EN2
UNNAMED_1_2N7002_I79_D
PG1
2
A
Q2
1
PG1
2
A
A
DRAWN BY:
A
DATE:
PAUL ORFANU
NOTE:
RELEASED BY:
ENGINEER:
03/06/2008
DATE:
UPDATED BY:
ISL8033A
DATE:
TIM KLEMANN
PLEASE KEEP COMP PIN TRACES SHORT (TO C8, R13)
05/06/2008
TESTER
FIGURE 2. ISL8033AEVAL1Z SCHEMATIC
1/19/08
TITLE:
TU BUI / PAUL ORFANU
PLEASE KEEP FB1, FB2 PINS TRACES SHORT
DATE:
PAUL ORFANU
DUAL 3A LOW IQ BUCK
USES: ISL8033_36EVAL1ZA
Application Note 1606
VOUT2B
C5
SYNC
5
OPEN
ISET
SS
4
PG2
FB2
VOUT2A
VDD
EN2
R_OUT
VIN1
16
VIN1
SYNC
FBA
VOUT2
VOUT2
0
0
R5
17
VIN1
U1
VIN2
PG1
#
FB
R2
R1
100K
VIN2
SGND
VDD
LX1
18
LX1
FB1
VDD
A
LX2
#
1
#
LX2
NC
3
A
PGND2
PGND2
LX2
PGND22A
AN1606.1
May 12, 2016
Application Note 1606
TABLE 2. BILL OF MATERIALS
PART
NUMBER
REFERENCE
DESIGNATOR
QTY UNITS
DESCRIPTION
MANUFACTURER
PART
MANUFACTURER
ISL8033_36EVAL1ZREVAPCB
1
ea.
a) PUT “X” IN
ISL8033 BOX ON
PCB
PWB-PCB,
ISL8033_36EVAL1Z,
REVA, ROHS
IMAGINEERING INC.
ISL8033_36EVAL1ZREVAPCB
ISL8033_36EVAL1ZREVAPCB
0
ea.
b) SEE
LABEL-RENAME
BOARD
PWB-PCB,
ISL8033_36EVAL1Z,
REVA, ROHS
IMAGINEERING INC.
ISL8033_36EVAL1ZREVAPCB
C2012X5R0J226M-T
6
ea.
C3, C4, C9, C11,
CIN1, CIN2
CAP, SMD, 0805, 22µF,
6.3V, 20%, X5R, ROHS
TDK
C2012X5R0J226M
H1045-00120-50V5-T
2
ea.
C5, C10
CAP, SMD, 0603, 12pF,
50V, 5%, COG, ROHS
AVX
06035A120JAT2A
H1045-DNP
0
ea.
C1, C2, C8, CD1,
CD2, CDC, C_PH
CAP, SMD, 0603,
DNP-PLACE HOLDER,
ROHS
H1046-DNP
0
ea.
C6, C7
CAP, SMD, 0805,
DNP-PLACE HOLDER,
ROHS
DR73-1R5-R (ISL8033)
2
ea.
L1, L2
COIL-PWR INDUCTOR,
SMD, 7.5mm, 1.5µH,
20%, 6.52A, ROHS
FDV0630-R60M (ISL8033A)
2
ea.
L1, L2
TOKO
Iron Powder Inductor,
SMD, 7.4X6.7mm, 0.6µH,
20%, 10A, ROHS
131-4353-00
4
ea.
LX1, LX2, VOUT1_S, CONN-SCOPE PROBE
VOUT2_S
TEST PT, COMPACT, PCB
MNT, ROHS
1514-2
8
ea.
a) PGND1, PGND2, CONN-TURRET, TERMINAL KEYSTONE
PGND11, PGND22, POST, TH, ROHS
VIN1, VIN2
1514-2
1514-2
0
ea.
b) VOUT1, VOUT2
CONN-TURRET, TERMINAL KEYSTONE
POST, TH, ROHS
1514-2
5000
6
ea
a) EN1, EN2, PG1,
PG2, SS, SYNC
CONN-MINI TEST PT,
VERTICAL, RED, ROHS
KEYSTONE
5000
5000
0
ea.
b) SYNC located
left of C_PH
CONN-MINI TEST PT,
VERTICAL, RED, ROHS
KEYSTONE
5000
5001
1
ea.
SGND
CONN-MINI TEST PT,
VERTICAL, BLK, ROHS
KEYSTONE
5001
5002
2
ea.
COMP, FB
CONN-MINI TEST PT,
VERTICAL, WHITE, ROHS
KEYSTONE
5002
LTST-C170CKT
2
ea.
D1, D2
LITEON/VISHAY
LED-GaAs RED, SMD,
2mmX1.25mm, 100mW,
40mA, 10mcd, ROHS
ISL8033IRZ (ISL8033EVAL1Z)
1
ea.
U1
IC-DUAL 3A BUCK
REGULATOR, 24P, QFN,
4X4, ROHS
2N7002-7-F-T
2
ea.
Q1, Q2
DIODES, INC.
TRANSISTOR,
N-CHANNEL, 3LD, SOT-23,
60V, 115mA, ROHS
H2509-DNP
1
ea.
R9
RES, SMD, 0201, 0Ω,
1/20W, 0%, TF
H2511-00R00-1/10W-T
4
ea.
R2, R5, R13, R_PH
RES, SMD, 0603, 0Ω,
1/10W, TF, ROHS
H2511-01003-1/10W1-T
5
ea.
R1, R4, R6, RF11,
RF21
RES, SMD, 0603, 100k,
1/10W, 1%, TF, ROHS
ISL8033AIRZ (ISL8033AEVAL1Z)
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4
COOPER ELECTRONIC DR73-1R5-R
TECH
TEKTRONIX
INTERSIL
VENKEL
FDV0630-R60M
131-4353-00
LTST-C170CKT
ISL8033IRZ
2N7002-7-F
CR0603-10W-000T
AN1606.1
May 12, 2016
Application Note 1606
TABLE 2. BILL OF MATERIALS (Continued)
PART
NUMBER
REFERENCE
DESIGNATOR
QTY UNITS
DESCRIPTION
MANUFACTURER
MANUFACTURER
PART
H2511-01243-1/10W1-T
2
ea.
RF12, RF22
RES, SMD, 0603, 124k,
1/10W, 1%, TF, ROHS
YAGEO
9C06031A1243FKHFT
H2511-02001-1/10W1-T
2
ea.
R8, R12
RES, SMD, 0603, 2k,
1/10W, 1%, TF, ROHS
KOA
RK73H1JTTD2001F
H2511-DNP
0
ea.
R3, R7, R11, R10,
R14
RES, SMD, 0603,
DNP-PLACE HOLDER,
ROHS
H2514-00R00-1/4W-T
1
ea.
R_IN
RES, SMD, 1210, 0Ω,
1/4W, TF, ROHS
VENKEL
CR1210-4W-000
H2514-DNP
0
ea.
R_OUT
RES, SMD, 1210, DNP,
DNP, DNP, TF, ROHS
GT11MSCBE-T
3
ea.
S1-S3
ITT INDUSTRIES/C&K
SWITCH-TOGGLE, SMD,
6PIN, SPDT, 2POS, ON-ON, DIVISION
ROHS
SJ-5003-BLACK
4
ea.
Bottom four corners BUMPONS, 0.44inW x
0.20inH, DOMETOP,
BLACK
5X8-STATIC-BAG
1
ea.
Place assy in bag
BAG, STATIC, 5X8, ZIP LOC INTERSIL
212403-013
LABEL-RENAME BOARD
1
ea.
RENAME PCB TO:
ISL8033EVAL1Z
LABEL, TO RENAME
BOARD
LABEL-RENAME BOARD
LABEL-SERIAL NUMBER
1
ea.
3M
INTERSIL
GT11MSCBE
SJ-5003SPBL
LABEL, FOR SERIAL
NUMBER AND BOM REV #
ISL8033EVAL1Z, ISL8033AEVAL1Z Board Layout
FIGURE 3. TOP COMPONENTS
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5
FIGURE 4. TOP LAYER ETCH
AN1606.1
May 12, 2016
Application Note 1606
ISL8033EVAL1Z, ISL8033AEVAL1Z Board Layout
(Continued)
FIGURE 5. 2ND LAYER ETCH
FIGURE 6. 3RD LAYER ETCH
FIGURE 7. BOTTOM LAYER ETCH
FIGURE 8. BOTTOM COMPONENTS (MIRROR)
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 document is current before proceeding.
For information regarding Intersil Corporation and its products, see www.intersil.com
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6
AN1606.1
May 12, 2016
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