Intersil ISL8202MEVAL1Z, User Manual

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User Guide 071
UG071.0
May 3, 2016
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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 V
OUT
= 1.2V, f
SW
= 1.5MHz by
default. For other V
OUT
options, the recommended f
SW
needs to
be adjusted by changing resistor (R
7
) 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 V
OUT
= 1.2V
option.
2. Set the ENABLE switches SW1 to the “OFF” position.
TABLE 1. ISL8202M COMPONENT SELECTION GUIDE MATRIX
V
IN
(V)
V
OUT
(V)
f
SW
(MHz)
C
IN
(µF)
C
OUT
(µF)
R
7
(k Ω )
R
SET
(k Ω )
C
FF
(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