參數(shù)資料
型號(hào)： XC6211A0AML
廠商： TOREX SEMICONDUCTOR LTD.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： High Speed LDO Regulator
中文描述： 高速LDO穩(wěn)壓器
文件頁(yè)數(shù)： 6/15頁(yè)
文件大?。?/td> 197K
代理商： XC6211A0AML
Preliminary
Operational Explanation
Output voltage control with the XC6211 series:
The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The P-Channel
MOSFET, which is connected to the VOUT pin, is then driven by the subsequent output signal. The output voltage at the VOUT
pin is controlled and stabilized by a system of negative feedback. The current limit circuit and short protect circuit operate in
relation to the level of output current. Further, the IC's internal circuitry can be shutdown via the CE pin's signal.
Low ESR Capacitors
With the XC6211 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase
compensation circuit is built-in. In order to ensure the effectiveness of the phase compensation, we suggest that an
output capacitor (CL) is connected as close as possible to the output pin (V
OUT
) and the VSS pin. Please use an
output capacitor with a capacitance value of at least 1
μ
F. Also, please connect an input capacitor (C
IN
) of 0.1
μ
F
between the V
IN
pin and the V
SS
pin in order to ensure a stable power input.
Current Limiter, Short-Circuit Protection
The XC6211 series includes a combination of a fixed current limiter circuit & a foldback circuit which aid the
operations of the current limiter and circuit protection. When the load current reaches the current limit level, the
fixed current limiter circuit operates and output voltage drops. As a result of this drop in output voltage, the foldback
circuit operates, output voltage drops further and output current decreases. When the output pin is shorted, a
current of about 50mA flows.
CE Pin
The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6211 series. In shutdown
mode, output at the V
OUT
pin will be pulled down to the V
SS
level via R1 & R2. The operational logic of the IC's CE
pin is selectable (please refer to the selection guide on page 3). Note that as the standard XC6211B type's
regulator 1 and 2 are both ' High Active/No Pull Down', operations will become unstable with the CE pin open.
Although the CE pin is equal to an inverter input with CMOS hysteresis, with either the pull-up or pull-down options,
the CE pin input current will increase when the IC is in operation. We suggest that you use this IC with either a V
IN
voltage or a V
SS
voltage input at the CE pin. If this IC is used with the correct specifications for the CE pin, the
operational logic is fixed and the IC will operate normally. However, supply current may increase as a result of
through current in the IC's internal circuitry.
Notes on Use
1
Please use this IC within the stated absolute maximum ratings.
The IC is liable to malfunction should the ratings be exceeded.
2
Where wiring impedance is high, operations may become unstable due to noise and/or phase lag
depending on output current. Please keep the resistance low between V
IN
and V
SS
wiring in particular.
3
Please wire the input capacitor (CIN) and the output capacitor (CL) as close to the IC as possible.
6
XC6211 Series
High Speed LDO Regulator
Low ESR Cap. Compatible, On / Off Switch
Current
Limit
ON/OFF
Control
Voltage
Reference
each circuit
CE
V
SS
V
OUT
V
IN
R2
R1
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