MIC94300YCS EV Micrel, MIC94300YCS EV Datasheet - Page 2

• Manufacturer Part Number: MIC94300YCS EV
• Description: Power Management IC Development Tools 200mA Ripple Blocker Voltage Follower in 0.88mm x 0.88mm Chip Scale Pkg - Evaluation Board
• Manufacturer: Micrel
• Type: Linear Regulators - Standardr

Specifications of MIC94300YCS EV

• Product: Evaluation Boards
• Tool Is For Evaluation Of: MIC94300
• Input Voltage: 1.8 V to 3.6 V
• Description/function: Evaluation Board
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Output Current: 200 mA
• For Use With: MIC94300

February 2012
Power Supply Ripple Rejection (PSRR)
Measurements
Figure 1 illustrates the frequency response of the
MIC94300.
For high-frequency measurements (above 1MHz),
careful attention must be made to the test set-up
configuration as it is easy to introduce noise into the
grounds which will give inaccurate measurements as
shown in Figure 2.
The inductance of test probes connected to the
evaluation board at higher frequencies becomes a
factor which can create a differential between the
device under test and test measurement system
grounds. Adding a low-value resistor (2Ω) in series
with the input capacitor to ground and utilizing a test
measurement system capable of making differential
measurements will help to reduce these affects.
Figure 1. MIC94300 Ripple Blocker™
-100
Figure 2. High-Frequency Noise on
-10
-20
-30
-40
-50
-60
-70
-80
-90
1.E+01 1.E+02 1.E+03 1.E+04 1.E+05 1.E+06 1.E+07
0
10
V
IN
Measurement System
= 3.6V + 40mVpp
Frequency Response
100
PSRR C
I
OUT
FREQUENCY (Hz)
= 100mA
1K
OUT
I
OUT
10K
= 10mA
= 1µF
100K
I
OUT
= 200mA
1M
10M
2
PSRR measurements may be made using either
dedicated PSRR test equipment or with a PSRR
interface board and a network analyzer. The network
analyzer can sweep the AC frequency and perform a
comparison measurement of the amplitude on the
input and output. With this method, the network
analyzer is configured for an A/R measurement. The
difficulty arises when trying to impose the network
analyzer’s AC signal with the DC input voltage to the
MIC94300.
accomplishes this by using the MIC911 as a summing
amplifier. The summing amplifier adds the V
(DC voltage) and the network analyzers AC signal. As
the network analyzers source is 50Ω impedance it
may be neglected, the DC voltage seen at the non-
inverting side is half of the V
is gained up by 2 with the 1kΩ resistor divider to the
non-inverting side. This sums the AC and DC voltages
with an overall gain of 1.
Figure 3. Network Analyzer Set-Up
The
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voltage. The output
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M9999-020812
Figure
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