Application Circuit Characteristics: continued
The graph provided below show typical RDS(ON) perfor-
Test Descriptions
mance for the PFET. The data is provided as VDS vs IOUT
The startup and supply transition waveforms shown in fig-
ures 1 through 4b were obtained using the application cir-
cuit board with a resistive load of 8.8Ω. This provides a DC
load of 375mA when the regulated output voltage is 3.3V.
A standard 2A bench supply was used to provide power to
the application circuit. The transient response waveforms
shown in the Typical Performance Characteristics section
were obtained by switching a 6.3Ω resistor across the out-
put.
for different values of VAUX
.
160
140
120
100
80
V
= 3.135V
AUX
V
= 3.300V
AUX
V
= 3.465V
AUX
400
Temperature Performance
60
40
The graph below shows thermal performance for the
CS5231-3 across the normal operating output current range.
20
0
0
100
200
300
500
55
I
(mA)
50
45
40
Figure 8: PFET Vds vs IOUT
35
30
25
20
0
50
100 150 200 250 300 350 400 450 500
Load Current (mA)
Figure 7: Package Temperature vs Load Current (VIN = 5V, TA =23 C°)
PFET RDS(ON) Performance
Application Circuit Bill of Materials
Refdes
Description
Part Number
Manufacturer
AVX Corp
Motorola
Contact Information
C1, C2
33µF, 16V tantalum capacitors
TAJ336K016
www.avxcorp.com
1-843-448-9411
www.mot-sps.com
Q1
U1
p-channel FET transistor
Linear regulator with auxiliary
MGSF1P02ELT1
CS5231-3DPS
Cherry Semiconductor
www.cherry-sem.com
1-800-272-3601
T1-T6
Turret pins
40F6023
Newark Electronics
www.newark.com
1-800-463-9275
10
CHERRY [ CHERRY SEMICONDUCTOR CORPORATION ]
