Intersil ISL85003EVAL2Z User manual

ISL85003EVAL2Z, ISL85003AEVAL2Z
Evaluation Board User Guide
AN1930 Rev.1.00 Page 1 of 5
Aug 28, 2014
AN1930
Rev.1.00
Aug 28, 2014
USER’S MANUAL
Description
The ISL85003 and ISL85003A kits are intended for use for
point-of-load applications sourcing from 4.5V to 18V. The kits
are used to demonstrate the performance of the ISL85003
and ISL85003A, low quiescent current high efficiency
synchronous buck regulators.
The ISL85003 and ISL85003A are offered in a 4x3mm dual flat
no lead (DFN) package.
Specifications
The boards are designed to operate at the following operating
conditions:
• Input voltage range from 4.5V to 18V
• Resistor programmable output voltage from 0.8V, ±1%
• Up to 3A output current
• Current mode control
- DCM/CCM
- Internal or external compensation options
- 500kHz switching frequency option
- External synchronization up to 2MHz on ISL85003
• Adjustable soft-start time on the ISL85003A
• Operating junction temperature range: -40°C to +125°C
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 (P4)
and the negative return to PGND (P5).
3. Connect the output load to V0, the plus terminal to V0 (P8)
and the negative return to PGND (P9).
4. Verify that the position is PWM or PFM for SW2.
5. Verify that the position is ON for SW1.
6. Turn on the power supply.
7. Verify the output voltage is 5V for VO.
Recommended Equipment
The following materials are recommended to perform testing:
• 0V to 25V power supply with at least 10A source current
capability
• Electronic loads capable of sinking current up to 7A
• Digital multimeters (DMMs)
• 100MHz quad-trace oscilloscope
• Signal generator
Key Board Features
•Small,compactdesign
• Switch selectable EN (enabled/disabled)
• Switch selectable MODE (auto-DCM/forced-PWM)
• Connectors and test points for easy probing
References
•ISL85003, ISL85003A datasheet
Evaluating the Other Output
Voltage
The ISL85003 and ISL85003A kit outputs are preset to 5V for
VOUT; however, the output voltages are programmed using an
external resistor divider that scales the feedback relative to the
internal reference voltage. The output voltage programming
resistor, R2, will depend on the value chosen for the feedback
resistor, R1, and the desired regulator output voltage, VOUT.
The value for the feedback resistor R1is typically between
10kΩand 400kΩas shown in Equation 1.
If the output voltage desired is 0.8V, then R2is left
unpopulated. R1is still required to set the low frequency pole
of the modulator compensation.
Switch Control
The ISL85003 and ISL85003A evaluation boards contain SW1
and SW2 for various controls of the ISL85003 and ISL85003A
circuitries. Table 1 details this function.
Ordering Information
PART NUMBER DESCRIPTION
ISL85003EVAL2Z Evaluation Board for ISL85003FRZ and
ISL85003AFRZ
TABLE 1. SWITCH SETTINGS
SW1 ENABLE FUNCTION
1OFFDisableV0
3ONEnableV0
SW2 MODE FUNCTION
1DCMForceDCM
3 PWM Fixed PWM frequency at light load
R2
R10.8V
VOUT 0.8V–
-------------------------------
=(EQ. 1)

ISL85003EVAL2Z, ISL85003AEVAL2Z
AN1930 Rev.1.00 Page 2 of 5
Aug 28, 2014
Components Selection
VOUT 0.8V 1V 1.2V 1.5V 1.8V 2.5V 3.3V 5V
C1, C210µF 10µF 10µF 10µF 10µF 10µF 10µF 10µF
C522µF 22µF 22µF 47µF 47µF 47µF 47µF 47µF
C622µF 22µF 22µF 22µF 22µF 22µF 22µF 22µF
C4Open Open Open 4.7pF 4.7pF 4.7pF 4.7pF 4.7pF
L11.8µH 2.2µH 2.2µH 3.3µH 3.3µH 3.3µH 4.7µH 4.7µH
R1301kΩ301kΩ301kΩ301kΩ301kΩ301kΩ301kΩ301kΩ
R2Open 1.2MΩ604kΩ344kΩ241kΩ142kΩ96.3kΩ57.6kΩ
NOTE: VIN = 12V, IOUT = 3A; The components selection table is a suggestion for typical application using internal compensation mode. For applications
that require high output capacitance greater than 200µF, R1should be adjusted to maintain a loop response bandwidth about 40kHz.
ISL85003EVAL2Z Evaluation Board
FIGURE 1. TOP VIEW FIGURE 2. BOTTOM VIEW

AN1930 Rev.1.00 Page 3 of 5 Aug 28, 2014
ISL85003EVAL2Z, ISL85003AEVAL2Z
ISL85003EVAL2Z Rev B Schematic
VCC
EN
VOUT
SYNC
PG
OFF
EN
VIN
SYNC
DCM
PWM ON
VCCVCC
VOUT
D2
DNP
C1
10uF
R5
2k
C3
0.1uF
SW2
C4
4.7p
SW1
R9
DNP
P6
ENABLE
C5
47uF
+
C10
150uF
P1
PG
Q1
2N7002
R6
200k
R2
57.1k
C8
DNP
P7
VCC
C6
22uF
P2
SYNC
C2
10uF
R11
0
R3
DNP
R7
200k
C7
DNP P8
VOUT
L1
4.7uH
D1
LTST-C190KGKT
P4
VIN
R14
200k
R1
301k
C9
1uF
P9
GND
R8
DNP
U1
ISL85003
PG
2
EN
3
FB
4
COMP
5
AGND
6PHASE 7
PHASE 8
VIN 9
VIN 10
VDD 11
BOOT 12
EPAD
13
SYNC
1
R4
20
J2
PHASE
1
2
P5
GND
J1
VOUT
1
2

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
AN1930 Rev.1.00 Page 4 of 5
Aug 28, 2014
ISL85003EVAL2Z, ISL85003AEVAL2Z
Bill of Materials
PART NUMBER QTY UNITS
REFERENCE
DESIGNATOR DESCRIPTION MFR MFR PART #
ISL85003FRZ 1 ea U1 IC-3A BUCK REGULATOR, 12P, DFN, 4X3,
ROHS
INTERSIL ISL85003FRZ
ISL85003AFRZ 1 ea U1 IC-3A BUCK REGULATOR PWM, 12P, DFN, 4X3,
ROHS
INTERSIL ISL85003AFRZ
EEE-FK1H151P-T 1 ea C10 CAP, SMD, 10.3mm, 150µF, 50V, 20%, ROHS,
ALUM.ELEC.
PANASONIC EEE-FK1H151P
H1044-004R7-50VR25-T 1 ea C4 CAP, SMD, 0402, 4.7pF, 50V, 0.25pF, NPO,
ROHS
MURATA GRM36COG4R7C050AQ
H1044-DNP 0 ea C7, C8, CSS CAP, SMD, 0402, DNP-PLACE HOLDER, ROHS
H1045-00104-50V10-T 1 ea C3 CAP, SMD, 0603, 0.1µF, 50V, 10%, X7R, ROHS AVX 06035C104KAT2A
H1045-00105-16V10-T 1 ea C9 CAP, SMD, 0603, 1µF, 16V, 10%, X5R, ROHS MURATA GRM188R61C105KA12D
H1065-00106-25V10-T 2 ea C1, C2 CAP, SMD, 1206, 10µF, 25V, 10%, X7R, ROHS VENKEL C1206X7R250-106KNE
H1065-00226-25V10-T 2 ea C5, C6 CAP, SMD, 1206, 22µF, 25V, 10%, X5R, ROHS MURATA GRM31CR61E226KE15L
RLF7030T-4R7M3R4 1 ea L1 COIL-PWR INDUCTOR, SMD, 7.3X6.8mm,
4.7µH, 20%, 3.5A, ROHS
TDK RLF7030T-4R7M3R4
131-4353-00 2 ea J1, J2 CONN-SCOPE PROBE TEST PT, COMPACT, PCB
MNT, ROHS
TEKTRONIX 131-4353-00
1514-2 4 ea P4, P5, P8, P9 CONN-TURRET, TERMINAL POST, TH, ROHS KEYSTONE 1514-2
5002 4 ea P1, P2, P6, P7 CONN-MINI TEST POINT, VERTICAL, WHITE,
ROHS
KEYSTONE 5002
BAT54C-T 1 ea D2 DIODE-RECTIFIER, SMD, SOT23, 3P, 30V,
200mA, ROHS
FAIRCHILD BAT54C
LTST-C190KGKT-T 1 ea D1 LED, SMD, 0603, GREEN CLEAR, 2V, 20mA,
571nm, 35mcd, ROHS
LITEON/VISHAY LTST-C190KGKT
2N7002LT1G-T 1 ea Q1 TRANSISTOR-MOS, N-CHANNEL, SMD, SOT23,
60V, 115mA, ROHS
ON
SEMICONDUCTOR
2N7002LT1G
H2510-00R00-1/16W-T 1 ea R11 RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS VENKEL CR0402-16W-00T
H2510-03013-1/16W1-T 1 ea R1 RES, SMD, 0402, 301k, 1/16W, 1%, TF, ROHS YAGEO RC0402FR-07301KL
H2510-05762-1/16W1-T 1 ea R2 RES, SMD, 0402, 57.6k, 1/16W, 1%, TF, ROHS PANASONIC ERJ-2RKF5762X
H2510-DNP 0 ea R3 RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS
H2511-00200-1/10W1-T 1 ea R4 RES, SMD, 0603, 20Ω, 1/10W, 1%, TF, ROHS PANASONIC ERJ-3EKF20R0V
H2511-02001-1/10W1-T 1 ea R5 RES, SMD, 0603, 2k, 1/10W, 1%, TF, ROHS KOA RK73H1JTTD2001F
H2511-02003-1/10W1-T 3 ea R6, R7, R14 RES, SMD, 0603, 200k, 1/10W, 1%, TF, ROHS VENKEL CR0603-10W-2003FT
H2511-DNP 0 ea R8, R9 RES, SMD, 0603, DNP-PLACE HOLDER, ROHS
GT11MSCBE-T 2 ea SW1, SW2 SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS, ON-
ON, ROHS
ITT INDUSTRIES/
C&K DIVISION
GT11MSCBE
SJ-5003-BLACK 4 ea Bottom four
corners
BUMPONS, 0.44inW x 0.20inH, DOMETOP,
BLACK
3M SJ-5003SPBL
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All trademarks and registered trademarks are the property of their respective owners.

ISL85003EVAL2Z, ISL85003AEVAL2Z
AN1930 Rev.1.00 Page 5 of 5
Aug 28, 2014
PCB Layout
FIGURE 3. TOP LAYER FIGURE 4. INNER LAYER 1
FIGURE 5. INNER LAYER 2 FIGURE 6. BOTTOM LAYER

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