NCP511SN25T1G ON Semiconductor, NCP511SN25T1G Datasheet - Page 9

• Manufacturer Part Number: NCP511SN25T1G
• Description: IC REG LDO 150MA 2.5V SOT23-5
• Manufacturer: ON Semiconductor

Specifications of NCP511SN25T1G

• Regulator Topology: Positive Fixed
• Voltage - Output: 2.5V
• Voltage - Input: Up to 6V
• Voltage - Dropout (typical): 0.11V @ 100mA
• Number Of Regulators: 1
• Current - Output: 150mA (Min)
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-5, TSOT-5, TSOP-5
• Number Of Outputs: 1
• Polarity: Positive
• Input Voltage Max: 6 V
• Output Voltage: 2.5 V
• Output Type: Fixed
• Dropout Voltage (max): 0.2 V at 100 mA
• Output Current: 150 mA
• Line Regulation: 3.5 mV / V
• Load Regulation: 0.8 mV / mA
• Voltage Regulation Accuracy: 2 %
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Limit (min): -
• Lead Free Status / Rohs Status: Details
• Other names: NCP511SN25T1GOSTR

Input
Enable
The NCP511 series can be current boosted with a PNP transist‐
or. Resistor R in conjunction with V
when the pass transistor begins conducting; this circuit is not
short circuit proof. Input/Output differential voltage minimum is
increased by V
If a delayed turn-on is needed during power up of several
voltages then the above schematic can be used. Resistor R,
and capacitor C, will delay the turn-on of the bottom regulator.
A few values were chosen and the resulting delay can be seen
in Figure 21.
R
1.0 mF
Input
Figure 18. Current Boost Regulator
Q1
Figure 20. Delayed Turn-on
BE
R
of the pass resistor.
1.0 mF
1.0 mF
C
1
2
3
1
2
3
1
2
3
Input
BE
R
A regulated output can be achieved with input voltages that
exceed the 6.0 V maximum rating of the NCP511 series with
the addition of a simple pre-regulator circuit. Care must be
taken to prevent Q1 from overheating when the regulated
output (V
of the PNP determines
5.6 V
Figure 22. Input Voltages Greater than 6.0 V
5
4
5
4
5
4
out
Q1
) is shorted to GND.
1.0 mF
1.0 mF
APPLICATION CIRCUITS
Output
1.0 mF
1.0 mF
Output
Output
http://onsemi.com
Input
NCP511
Q2
9
Short circuit current limit is essentially set by the V
R1. I
1
2
3
4
3
2
1
0
3
2
1
0
R1
R2
0
0
SC
The graph shows the delay between the enable signal and
output turn-on for various resistor and capacitor values.
= ((V
Figure 19. Current Boost Regulator
20
20
BEQ2
1.0 mF
R3
5
4
with Short Circuit Limit
No Delay
No Delay
Figure 21. Delayed Turn-on
40
40
- ib * R2) / R1) + I
R = 1.0 MW
R = 1.0 mW
C = 0.1 mF
C = 0.1 mF
Q1
1.0 mF
60
60
Output
Time (ms)
Time (ms)
1
2
3
80
80
O(max) Regulator
R = 1.0 MW
R = 1.0 MW
C = 1.0 mF
C = 1.0 mF
100
100
T
V
V
A
out
in
120
120
5
4
= 25°C
= 3.5 V
BE
= 3.0 V
of Q2 and
140
140
1.0 mF
Output
160
160