SP6231EB Datasheet, PDF (1/4 Pages) Sipex Corporation – Evaluation Board Manual

SP6231EB
Evaluation Board Manual
ƒ Easy Evaluation for the SP6231 Linear
Regulator with Auxiliary Backup.
ƒ Evaluation Board provides complete,
ready to use solutions ideal for Digital
Still Camera (DSC) with USB port.
ƒ 5.0 In, 3.3V Out, 500mA LDO.
ƒ Integrated Auxiliary Voltage Switch 0.2Ω.
ƒ Glitch Free Transition between Two
Supplies: Battery or USB downloading.
ƒ Current Limit and Thermal Shutdown
Protection.
ƒ Fast Transient Response.
ƒ Applications: DSC, PCMCIA/PCI cards,
NIC Cards, Dual Power Systems.
DESCRIPTION
The SP6231 Evaluation Board is designed to help the user evaluate the performance of
the SP6231 for use as a dual power source for applications like a DSC with USB port
power for downloading. The Evaluation Board operates from a 5V main supply which
can be from the on-board USB connector, providing a regulated 3.3V output at 500mA
or if that input is not present then from a 3.3V AUX switch input. The 3.3V AUX input is
available from an on-board option: Sipex’s SP6641B 2 Cell Battery Boost Converter to
3.3V auxiliary supply.
The SP6231 Evaluation Board can be used to provide glitch free transition between two
supplies. When the main power 5.0V input drops below 4.4V the auxiliary 3.3V is
switched to the output through the internal PFET. Thus, the SP6231 guarantees 3.3V
output “glitch free” operation.
SP6231REB SCHEMATIC
SP6231 500MA LDO WITH AUX SWITCH
J2
USB CONNECTOR
1 _+5V
2
3
4 _GND
VIN 5V
VBATT
1.8V to 3.3V
A MP# 7876 16
J1 SHDN
SP6641B 2 CELL BOOST ^{6641 3.3V}
VAUX
U2 SP6231
U1 SP6641B
1
1uF Cer.
2
3
4 _SHDN
V OUT ³
C6
GND ²
5 _{V BATT}
LX ¹
L2 SM Bead
C2
100uF
C5
0.1uF
1 _{V A UX}
2 _GND
3 _GND
V out ⁶
V in ⁵
V sense ⁴
80mohm
L1 10uH
D1
C1
100uF
80mohm
SCHOTTKY DIODE
C3
2.2uF Cer.
VOUT 3.3V
C4
10uF Cer.
Rev 09/24/02
SP6231 Evaluation Board Manual Copyright Sipex Corporation