MC33263NW-30R2 ON Semiconductor, MC33263NW-30R2 Datasheet - Page 6

• Manufacturer Part Number: MC33263NW-30R2
• Description: IC, LDO VOLT REG, 3V, 150mA, 6-SOT-23
• Manufacturer: ON Semiconductor

Specifications of MC33263NW-30R2

• Primary Input Voltage: 12V
• Output Voltage Fixed: 3V
• Dropout Voltage Vdo: 180mV
• No. Of Pins: 6
• Output Current: 150mA
• Operating Temperature Range: -40°C to +85°C
• Peak Reflow Compatible (260 C): No
• Rohs Compliant: No

applications, an immediate response to an enable signal is
vital. If noise is not of concern, the MC33263 without a
bypass capacitor settles in nearly 20
65
bypass capacitor to decrease the noise down to 25
between 100 Hz and 100 kHz. With the adjunction of the
10 nF capacitor, the wake–up time expands up to 1 ms as
shown on the data–sheet curves. If an immediate response
is wanted, following figure’s circuit gives a solution to
charge the bypass capacitor with the enable signal without
degrading the noise response of the MC33263.
sends its wake–up signal by going to a high level, the PNP
base is momentarily tight to ground. The PNP switch closes
and immediately charges the bypass capacitor C1 toward its
operating value. After a few
totally transparent to the regulator.
which drops from 1 ms down to 30
to be tweaked in order to avoid any bypass capacitor
overload during the wake–up transient.
MC33263 Wake–up Improvement – In portable
In ultra low–noise systems, the designer needs a 10 nF
At power–on, C4 is discharged. When the control logic
This circuit improves the response time of the regulator
m
VRMS between 100 Hz and 100 kHz.
Figure 5. MC33263 Wake–up Improvement with Small PNP Transistor
m
s, the PNP opens and becomes
m
m
s. The value of C4 needs
s and typically delivers
m
VRMS
http://onsemi.com
MC33263
6
30
m
Input
s
1 ms
+
Figure 4. A PNP Transistor Drives the
Bypass Pin when Enable Goes High
C3
1.0
On/Off
470 pF
Wake–up Improvement
Wake–up Improvement
m
F
(Typical Response)
(Typical Response)
C4
MC33263 Without
MC33263 With
R2
220 k
MMBT2902LT1
Q1
6
1
MC33263
5
2
4
3
C1
10 nF
+
Output
C2
1.0
m
F