Intersil ISL8202MEVAL1Z User manual

1CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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May 3, 2016
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ISL8202MEVAL1Z Evaluation Board User Guide
The ISL8202M power module is a single-channel synchronous
step-down complete power supply, capable of delivering up to
3A of continuous current. Operating from a single 2.6V to 5.5V
input power rail and integrating a controller, power inductor
and MOSFETs, ISL8202M can achieve up to 95% conversion
efficiency. It also provides fast transient response with
excellent loop stability as well as deliver output voltage as low
as 0.6V. Switching frequency is also adjustable from 680kHz
to 3.5MHz with either external resistor or SYNC clock option.
Selectable PFM mode can also be enabled to boost up
light-load efficiency to extend battery life. Other features
include programmable soft-start, soft-stop, input undervoltage
lockout, 100% duty cycle operation, over-temperature,
overcurrent/short-circuit with hiccup mode, overvoltage and
negative overcurrent protection. It also has a dedicated enable
pin and power-good flag that allow for easy system power rails
sequencing.
The ISL8202MEVAL1Z evaluation board is designed to
demonstrate the performance of the ISL8202M. The board is
by default set to be 1.2V output voltage with 1.5MHz switching
frequency. Other output voltage values can be easily set by
changing the jumper position. Switching frequency can be
adjusted by changing the FS pin resistor.
References
•ISL8202M datasheet
Key Features
• 2.6V to 5.5V input voltage range
• Adjustable output voltage as low as 0.6V with ±1.6%
accuracy over line/load/temperature
• Default 1.8MHz current mode control operations
- 680kHz to 3.5MHz resistor adjustable
- External synchronization up to 3.5MHz
- Selectable light-load efficiency mode
- 100% duty cycle LDO mode
• Programmable soft-start and soft-stop output discharge
• Dedicated enable pin and power-good flag
• UVLO, over-temperature, overcurrent, overvoltage and
negative overcurrent protections
Specifications/Default Set-Up
•V
IN = 2.6V to 5.5V
•V
OUT options (via jumper selection): 1V, 1.2V, 2.5V, 3.3V
•MAXI
OUT up to 3A
•f
SW = 1.5MHz by default
• Set to PWM mode by default
•1mssoft-starttimebydefault
Ordering Information
PART NUMBER DESCRIPTION
ISL8202MEVAL1Z ISL8202M single 3A power module evaluation
board
FIGURE 1. ISL8202MEVAL1Z BLOCK DIAGRAM
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Recommended Equipment
• 0V to 5.5V power supply with at least 5A source current
capability
• Electronic load capable of sinking current up to 3A
• Digital Multimeters (DMMs)
• 100MHz quad-trace oscilloscope
Functional Description
The ISL8202M is a single 3A step-down high efficiency power
module optimized for FPGA, DSP and Li-ion battery power
devices. The module switches at 1.8MHz by default when the FS
pin is shorted to VIN. The switching frequency is also adjustable
from 680kHz to 3.5MHz through a resistor from FS to SGND. To
boost light-load efficiency, ISL8202M can also be configured to
operate in PFM mode by pulling the SYNC pin to SGND. Peak
current mode control scheme is implemented for fast transient
response. The module utilizes internal compensation to stabilize
the system and optimize transient response, which greatly
simplifies the application. Other excellent features include
external synchronization, 100% duty cycle operation and very low
quiescent current. For further information, please refer to the
ISL8202M datasheet.
Quick Start
The ISL8202MEVAL1Z is set to be VOUT = 1.2V, fSW = 1.5MHz by
default. For other VOUT options, the recommended fSW needs to
be adjusted by changing resistor (R7) connected to the FS pin.
Please refer to Table 1 for more information. The following
operation procedure will be based on default setting.
1. Before applying power to input, ensure one shorting jumper
on J1 across pins 5 and 6 is present. This selects VOUT = 1.2V
option.
2. Set the ENABLE switches SW1 to the “OFF” position.
TABLE 1. ISL8202M COMPONENT SELECTION GUIDE MATRIX
VIN
(V)
VOUT
(V)
fSW
(MHz)
CIN
(µF)
COUT
(µF)
R7
(kΩ)
RSET
(kΩ)
CFF
(pF)
5 0.6 0.8 2x22 3x22 261 OPEN 680
5 0.9 1.2 2x22 3x22 169 200 680
5 1 1.3 2x22 2x22 154 150 820
5 1.2 1.5 2x22 2x22 130 100 680
5 1.5 1.9 2x22 2x22 102 66.5 390
5 1.8 2 2x22 2x22 95.3 49.9 390
5 2.5 2 2x22 2x22 95.3 31.6 220
5 3.3 2 2x22 2x22 95.3 22.1 390
3.3 0.6 0.8 2x22 3x22 261 OPEN 680
3.3 0.9 1.2 2x22 3x22 169 200 680
3.3 1 1.3 2x22 2x22 154 150 820
3.3 1.2 1.5 2x22 2x22 130 100 680
3.3 1.5 1.9 2x22 2x22 102 66.5 390
3.3 1.8 2 2x22 2x22 95.3 49.9 390
3.3 2.5 2 2x22 2x22 95.3 31.6 220
FIGURE 2. TOP OF BOARD FIGURE 3. BOTTOM OF BOARD

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3. Connect the positive of a power supply to the VIN connector
and the negative of the power supply to the PGND connector.
Make sure the power supply is not enabled when making
connections and the input power supply voltage is set to a
value between 2.6V and 5.5V.
4. Turn the power supply on.
5. Turn ENABLE switch SW1 to the “ON” position to enable
module operation.
6. The power-good LED should illuminate in green if the module
is operating properly.
7. Measure output voltage, VOUT, at test points VOUT and PGND.
Module output should be 1.2V.
Programming the Output Voltage
The ISL8202MEVAL1Z evaluation board has several preset
output voltages, 1.0V, 1.2V, 2.5V and 3.3V, which can be selected
in J1 jumper. Other VOUT values other than on-board options can
be set by proper selection of the resistor (RSET) connecting from
FB to SGND. In this case, RSET for default options (R9, R10, R11,
R12) may need to be changed. The output voltage is governed by
Equation 1.
For most popular VOUT values and corresponding RSET values,
please refer to Table 1 on page 2 for more information.
Feed-Forward Capacitor Selection
In typical applications where the output capacitors are all ceramic,
a feed-forward capacitor, CFF (as annotated as C12, C13, C14, C15 in
schematic) is needed to be put in parallel with each RSET to insure
loop stability in extreme operating conditions. With internal
compensation mode enabled, the CFF values for typical operating
conditions are optimized and listed in Table 1. This is how C12,
C13, C14 and C15 default values are selected. Please note that, for
system parameters that are different from Table 1 or external
instead of internal compensation is used, the optimized value of
CFF needs to be adjusted.
Frequency Adjust
The switching frequency of ISL8202M is adjustable ranging from
680kHz to 3.5MHz via a simple resistor RFS (as shown in R7on
ISL8202MEVAL1Z board) across FS to SGND. The switching
frequency setting is based on Equation 2:
When the FS pin is directly tied to VIN, the frequency of operation
is fixed at 1.8MHz. For a recommended switching frequency with
typical operation conditions, refer to Table 1. More detailed
information on recommended switching frequency and fSW
selection range is provided in “Recommended Switching
Frequency”and “Operation Range”.
Recommended Switching Frequency
Selection of switching frequency for each VIN and VOUT
combination needs to take into account a few trade-offs.
Generally, lower switching frequency will lead to higher
efficiency. However, switching frequency should not be
decreased too low due to negative current protection limit.
Moreover, when output voltage is relatively high, low switching
frequency will result in more sub-harmonic oscillation. Therefore,
operating frequency needs to be kept relatively high under high
VOUT conditions. However, again, switching frequency cannot be
increased too much. Otherwise, the minimum on-time limit could
be violated. Based on these considerations, Figure 4 provides the
recommended switching frequency under various typical VIN and
across VOUT ranges.
Operation Range
By default, the ISL8202MEVAL1Z is configured to operate at
VOUT = 1.2V (J1 jumper position is at pins 5 and 6), fSW = 1.5MHz
conditions. The VIN ranges from 2.6V to 5.5V. The board can also
support a wider operating range to meet the requirement of
specific applications. VOUT can be adjusted from 0.6V to 5V. Load
current range is from 0A to 3A. Note that, for continuous
operation at 3A, airflow across the board may be needed. The
fSW can also be tuned. However, to ensure sufficient stability
margins, switching frequency can only be adjusted within the
safe operating regions represented with Figures 5 through 9.
Operating outside of these areas may lead to system instability.
(EQ. 1)
VOUT VREF
RSET 100k+
RSET
----------------------------------------
=
RFS k 220 103

fOSC kHz
------------------------------ 14–= (EQ. 2)
FIGURE 4. SWITCHING FREQUENCY RECOMMENDATION
FIGURE 5. OPERATION REGION VIN = 5.5V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.6 1 1.4 1.8 2.2 2.6 3 3.4 3.8 4.2 4.6 5
OUTPUT VOLTAGE (V)
VIN=5V
VIN=4V
VIN=3.3V
VIN=2.6V
SWITCHING FREQUENCY (MHz)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.6 1 1.4 1.8 2.2 2.6 3 3.4 3.8 4.2 4.6
5
OUTPUT VOLTAGE (V)
SWITCHING FREQUENCY (MHz)

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PWM/PFM Selection
By default, ISL8202MEVAL1Z is set to operate in PWM mode.
This is achieved by connecting SYNC to VIN through R1. Pulling
the SYNC pin LOW, forces the module into PFM mode, which
enables pulse-skipping at light load to minimize the switching
loss by reducing the switching frequency. Refer to ISL8202M
datasheet for more detailed information. For ISL8202MEVAL1Z,
PFM mode can be enabled by removing R1and shorting SYNC to
SGND by putting a 0Ωresistor on R2.
Soft Start-Up
The soft start-up reduces the inrush current during the start up.
For ISL8202MEVAL1Z, the soft start-up time is set to 1ms by
default through C6. However, start-up time can be adjusted by
tuning the C6value. Equation 3 can be used to determine the C6
value for the target soft-start time tSS.
Evaluation Board Information
The ISL8202MEVAL1Z evaluation board is a 2x2 in2four-layer FR-4
board with 2oz. copper on all the layers. The board can be used as a
single 3A reference design. Refer to Figures 11 through 14 for board
layout information. The board is designed with mechanical switches
for ENABLE, power-good LED indicators, several connectors, test
points and jumpers, which make testing the board easy.
Thermal Considerations and
Current Derating
Board layout is very critical in order to make the module operate
safely and deliver maximum allowable power. In order for the board
to operate properly in the high ambient temperature environments
and carry full load currents, the board layout needs to be carefully
designed to maximize thermal performance. To achieve this, select
enough trace width, copper weight and proper connectors.
The ISL8202MEVAL1Z evaluation board is capable of operating at
3A full load current at room temperature with plenty of safety
margin for junction temperature. However, if the board is to operate
at elevated ambient temperatures, then the available output current
may need to be derated. Refer to the derated current curves in the
ISL8202M datasheet to determine the maximum output current
the evaluation board can supply.
FIGURE 6. OPERATION REGION VIN = 5.0V
FIGURE 7. OPERATION REGION VIN = 4.0V
FIGURE 8. OPERATION REGION VIN = 3.3V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.6 1 1.4 1.8 2.2 2.6 3 3.4 3.8 4.2
OUTPUT VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.6 1 1.4 1.8 2.2 2.6 3 3.4
OUTPUT VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6
2.8
OUTPUT VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
FIGURE 9. OPERATION REGION VIN = 2.6V
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.6 0.8 1 1.2 1.4 1.6 1.8
2
OUTPUT VOLTAGE (V)
SWITCHING FREQUENCY (MHz)
C6F 3.1 tSS S=(EQ. 3)

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ISL8202MEVAL1Z Schematic
FIGURE 10. SCHEMATIC
DRAWN BY: DATE: ENGINEER:
PGND
PGND
PGND
ENABLE
PGND
E
E
E
E
IN
IN
OUT
OUT
IN
R11
100K
3300PF
C6
C16
4.7UF
31.6K
R10
BAN2
0
R15
R4
DNP
C11
DNP
C1
DNP
ISL8202MIRZ
U1
1
FB
2
VSENSE
3
PGND
4
VSENSE
5
NC
6
VOUT
7
NC
8
NC
9
SW
10
NC
11
VIN
12
PG
13
SYNC
14
PGND
15
EN
16
FS
17
SS
18
COMP
19
20
PGND
21
SW
22
PGND
TP3
2 4 6 8
1
7 5 3
J1
1 2 3 4 5 6 7 8
BAN1
C12
390PF
BAN4
100K
R13
R16
DNP
C10
DNP
BAN3
C2
22UF
C4
OPEN
R3
200K
22UF
C8
R9
22.1K
SW1
C15
820PF
C3
22UF
R6
DNP
680PF
C14
TP2
TP4
150K
R12
2N7002-7-F
Q1
DNP
R2
C9
DNP
TP1
C13
220PF
C5
OPEN
200K
R1
TP6
C7
22UF
130K
R7
LED1
R5
0
TP8
TP5
TP7
R14
2K
EN
PGOOD
PGOOD
SW
SYNC
UNNAMED_1_CONN8_I67_IN1
UNNAMED_1_CONN8_I67_IN2
UNNAMED_1_CONN8_I67_IN3UNNAMED_1_CONN8_I67_IN5UNNAMED_1_CONN8_I67_IN7
UNNAMED_1_GTSERIES_I4_NC
UNNAMED_1_I SL8202M_I106_16 UNNAMED_1_ISL8202M_I106_17 UNNA MED_1_ISL8202M_I106_18
UNNAMED_1_ISL8202M_I106_2
UNNAMED_1_NCHANNEL_I17_D
UNNAMED_1_SMCAP_I68_A
UNNAMED_1_S MLED_I105_A
VIN
VIN
VIN
VOUT

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Bill of Materials
REFERENCE
DESIGNATOR QTY MANUFACTURER PART NUMBER DESCRIPTION
C16 1 MURATA GRM21BR71A475KA73L CAP, SMD, 0805, 4.7µF, 10V, 10%, X7R, ROHS
C13 1 PANASONIC ECU-E1H221JCQ CAP, SMD, 0402, 220pF, 50V, 5%, C0G, ROHS
C6 1 PANASONIC ECU-E1E332KBQ CAP, SMD, 0402, 3300pF, 25V, 10%, X7R, ROHS
C12 1 YAGEO CC0402JRNPO9BN391 CAP, SMD, 0402, 390pF, 50V, 5%, NP0, ROHS
C14 1 YAGEO CC0402JRNPO9BN681 CAP, SMD, 0402, 680pF, 50V, 5%, NP0, ROHS
C15 1 SAMSUNG CL05C821JB5NNNC CAP, SMD, 0402, 820pF, 50V, 5%, NP0, ROHS
C4, C5 0 CAP, SMD, 0402, DNP-PLACE HOLDER, ROHS
C2, C3, C7, C8 4 TAIYO YUDEN LMK316AB7226KL-TR CAP, SMD, 1206, 22µF, 10V, 10%, X7R, ROHS
C1, C9 2 CAP, SMD, 1206, DNP-PLACE HOLDER, ROHS
TP1-TP8 8 KEYSTONE 5002 CONN-MINI TEST POINT, VERTICAL, WHITE,
ROHS
BAN1-BAN4 4 KEYSTONE 575-4 CONN-JACK, MINI BANANA, 0.175 PLUG,
NICKEL/BRASS, ROHS
J1 1 BERG/FCI 68000-236HLF CONN-HEADER, 1x8, BRKAWY 1x36, 2.54mm,
ROHS
J1-Pins 5-6 1 SULLINS SPC02SYAN CONN-JUMPER, SHORTING, 2PIN, BLACK, GOLD,
ROHS
LED1 1 LITEON/VISHAY LTST-C190KGKT LED, SMD, 0603, GREEN CLEAR, 2V, 20mA,
571nm, 35mcd, ROHS
U1 1 INTERSIL ISL8202MIRZ IC-3A PWR MODULE, ANALOG DC/DC, 22P, QFN,
4.5x7.5, ROHS
Q1 1 DIODES, INC. 2N7002-7-F TRANSISTOR, N-CHANNEL, 3LD, SOT-23, 60V,
115mA, ROHS
R7 1 TE CONNECTIVITY 3-1879216-1 RES, SMD, 0402, 130k, 1/16W, 0.1%, TF, ROHS
R12 1 TE CONNECTIVITY 3-1879216-2 RES, SMD, 0402, 150k, 1/16W, 0.1%, TF, ROHS
R9 1 TE CONNECTIVITY 6-1879215-6 RES, SMD, 0402, 22.1k, 1/16W, 0.1%, TF, ROHS
R11 1 TE CONNECTIVITY 9-1879208-7 RES, SMD, 0402, 100k, 1/16W, 0.1%, TF, ROHS
R4 0 RES, SMD, 0603, 0.1%, MF, DNP-PLACE
HOLDER
R5, R15 2 VENKEL CR0402-16W-00T RES, SMD, 0402, 0Ω, 1/16W, 5%, TF, ROHS
R1 1 ROHM MCR01MZPF2003 RES, SMD, 0402, 200k, 1/16W, 1%, TF, ROHS
R2, R6, R16 0 RES, SMD, 0402, DNP, DNP, DNP, TF, ROHS
R13 1 VENKEL CR0603-10W-1003FT RES, SMD, 0603, 100k, 1/10W, 1%, TF, ROHS
R14 1 KOA RK73H1JTTD2001F RES, SMD, 0603, 2k, 1/10W, 1%, TF, ROHS
R3 1 VENKEL CR0603-10W-2003FT RES, SMD, 0603, 200k, 1/10W, 1%, TF, ROHS
R10 1 YAGEO RT0402BRD0731K6L RES, SMD, 0402, 31.6k, 1/16W, 0.1%, TF, ROHS
SW1 1 ITT INDUSTRIES/C&K
DIVISION
GT11MSCBE SWITCH-TOGGLE, SMD, 6PIN, SPDT, 2POS,
ON-NONE-ON, ROHS
C10 0 CAP, TANT, SMD, 2917, 10V, DNP-PLACE
HOLDER
C11 0 CAP, TANT POLY, SMD, 2917, 10V, DNP-PLACE
HOLDER

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Board Layout
FIGURE 11. TOP LAYER (TOP VIEW) FIGURE 12. INNER LAYER 1 (TOP VIEW)
FIGURE 13. INNER LAYER 2 (TOP VIEW) FIGURE 14. BOTTOM LAYER (BOTTOM VIEW)

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ISL8202MEVAL1Z Performance Data The following data was acquired using a ISL8202MEVAL1Z evaluation
board at +25°C ambient and free air 0LFM.
FIGURE 15. EFFICIENCY TA= +25°C, VIN = 3.3V PFM MODE FIGURE 16. EFFICIENCY TA= +25°C, VIN = 5V PFM MODE
FIGURE 17. EFFICIENCY TA= +25°C, VIN = 3.3V PWM MODE FIGURE 18. EFFICIENCY TA= +25°C, VIN = 5V PWM MODE
FIGURE 19. LOAD TRANSIENT VIN = 5V, VOUT = 1.2V, IOUT = 0 TO 3A,
fSW = 1.5MHz, COUT = 2 x 22µF CERAMIC CAPACITORS
LOAD CURRENT SLEW RATE: 1A/µs
FIGURE 20. LOAD TRANSIENT VIN = 5V, VOUT = 3.3V, IOUT = 0 TO 3A,
fSW = 2MHz, COUT = 2 x 22µF CERAMIC CAPACITORS,
LOAD CURRENT SLEW RATE: 1A/µs
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
00.511.522.53
LOAD CURRENT (A)
Vout = 1V , Fsw = 1.3MHz
Vout=1.2V , Fsw = 1.5MHz
Vout = 2.5V, Fsw = 2MHz
EFFICIENCY (%)
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
0 0.5 1 1.5 2 2.5 3
LOAD CURRENT (A)
Vout = 1V , Fsw = 1.3MHz
Vout=1.2V , Fsw = 1.5MHz
Vout = 2.5V, Fsw = 2MHz
Vout = 3.3V, Fsw = 2MHz
EFFICIENCY (%)
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
0 0.5 1 1.5 2 2.5 3
LOAD CURRENT (A)
Vout = 1V , Fsw = 1.3MHz
Vout=1.2V , Fsw = 1.5MHz
Vout = 2.5V, Fsw = 2MHz
EFFICIENCY (%)
60.0
65.0
70.0
75.0
80.0
85.0
90.0
95.0
100.0
00.511.522.53
LOAD CURRENT (A)
Vout = 1V , Fsw = 1.3MHz
Vout=1.2V , Fsw = 1.5MHz
Vout = 2.5V, Fsw = 2MHz
Vout = 3.3V, Fsw = 2MHz
EFFICIENCY (%)
VOUT 50mV/DIV
IOUT 1A/DIV
100µs/DIV
100µs/DIV100µs/DIV
VOUT 50mV/DIV
IOUT 1A/DIV

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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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FIGURE 21. THERMAL IMAGE AT VIN = 5V, VOUT = 1.2V, IOUT = 3A, fSW = 1.5MHz, TA = +25°C, FREE AIR 0 LFM
ISL8202MEVAL1Z Performance Data The following data was acquired using a ISL8202MEVAL1Z evaluation
board at +25°C ambient and free air 0LFM. (Continued)
MAX=37.1°C

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