SP6231 Datasheet, PDF (3/10 Pages) Sipex Corporation – 500mA, 3.3V Linear Regulator with Auxiliary Backup

8 Pin NSOIC 6 Pin DFN
1
4
2
5
3
6
4
1
5-8
3
-
2
PIN DESCRIPTION
PIN NAME
V_SENSE
V_IN
V_OUT
V_AUX
GND
NC
DESCRIPTION
Kelvin connection with 3.3V feedback. Always tiethis pin to
the point of regulation
Main 5V input.
V_OUT = 3.3V when V_IN > 4.5V; V_OUT = V_AUX when V_IN ≤ 4.4V
3.3V auxiliary backup supply that is switched in through an
internal PMOS when V_IN drops below 4.4V typically.
6 pin MLP is grounded.
No connect
FUNCTIONAL DIAGRAM
V_IN
V_AUX
GND
Current
Limit
1.0A
V_{REF -}
ENABLE
+
LDO
M1
R1
Control Logic
Current
Limit
0.8A
R2
ENABLE
+
V_{REF _}
100mV
Hysteresis
V_REF
Bandgap
Reference
Thermal
Shutdown
165°C
M2
+3.3V V_AUX
V_IN
V_OUT
V_SENSE
(Kelvin tied to V_OUT)
R3
R4
GND
Date: 5/25/04
SP6231 500mA, 3.3V Linear Regulator
3
© Copyright 2004 Sipex Corporation