CS8311YDR8 ON Semiconductor, CS8311YDR8 Datasheet - Page 5

• Manufacturer Part Number: CS8311YDR8
• Description: IC REG LDO 100MA 10V MPWR 8SOIC
• Manufacturer: ON Semiconductor

Specifications of CS8311YDR8

• Regulator Topology: Positive Fixed
• Voltage - Output: 10V
• Voltage - Input: 11 ~ 26 V
• Voltage - Dropout (typical): 0.4V @ 100mA
• Number Of Regulators: 1
• Current - Output: 100mA
• Current - Limit (min): 105mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: CS8311YDR8OS

power source, the CS8311 regulator. A SWITCH
(potentially an I/O port on microprocessor) is used to drive
the base of Q1. When Q1 is driven into saturation, the
voltage on the
threshold. The regulator’s output is enabled. When the drive
current is removed, the voltage on the ENABLE lead rises,
the output is switched off and the IC moves into Sleep mode
where it draws 50 A (max).
the system has added flexibility. Once the system is running,
the state of the SWITCH is irrelevant as long as the I/O port
continues to drive Q1. The microprocessor can turn off its
own power by withdrawing drive current, once the
SWITCH is open. This software control at the I/O port
allows the microprocessor to finish key housekeeping
functions before power is removed.
50 A to Q1. In automotive applications the SWITCH is
connected to the ignition switch.
Microprocessor
The circuit depicted in Figure 5 lets the system control its
By coupling these two controls with the ENABLE lead,
The logic options are summarized in Table 1.
The I/O port of the microprocessor typically provides
I/O Drive
OFF
ON
V
Table 1. Logic Control of CS8311 Output
BAT
Figure 5. Microprocessor Control of CS8311 Using External Switching Transistor Q1
0.1 F
ENABLE lead falls below its lower
Switch
Closed
Closed
Open
Open
SWITCH
ENABLE
500 k
HIGH
LOW
LOW
LOW
Q1
500 k
APPLICATION NOTES
Output
ENABLE
OFF
V
ON
ON
ON
IN
http://onsemi.com
CS8311
CS8311
GND
5
100 k
three main characteristics of a linear regulator: start–up
delay, load transient response and loop stability.
availability, size and temperature constraints. A tantalum or
aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause
instability. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low
temperatures (–25 C to –40 C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturers data sheet usually provides this information.
6 should work for most applications, however it is not
necessarily the optimized solution.
RESET
V
0.1 F
*C
IN
*C
minimum temperature expected.
V
The output or compensation capacitor helps determine
The capacitor value and type should be based on cost,
The value for the output capacitor C
C
OUT
IN
OUT
IN
required if regulator is located far from the power supply filter
*
Figure 6. Test and Application Circuit Showing
required for stability. Capacitor must operate at
STABILITY CONSIDERATIONS
R
RST
ENABLE
C
RST
Output Compensation
10 V, 100 mA
100 k
CS8311
RESET
V
OUT
C
OUT
OUT
R
To Load
To P
To P
I/O
RST
shown in Figure
C
10 F
.
OUT
**