XC6501A12ANL TOREX [Torex Semiconductor], XC6501A12ANL Datasheet - Page 7

• Manufacturer Part Number: XC6501A12ANL
• Description: Output Capacitor-Less, Low Power Consumption, High Speed LDO Regulator
• Manufacturer: TOREX [Torex Semiconductor]

■OPERATIONAL EXPLANATION
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 V
is controlled & 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.
<C
The XC6501B/D series can discharge the electric charge in the output capacitor C
enables a whole IC circuit turn off, is inputted via the N-channel transistor located between the V
shown in the BLOCK DIAGRAM. The C
The discharge time of the output capacitor C
setting time constant of a C
Rdischg), the output voltage after discharge via the N-channel transistor is calculated by the following formulas.
<Current Limiter, Short-Circuit Protection>
The XC6501 series’ fold-back circuit operates as an output current limiter and a short protection of the output pin. When the
load current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. When the
output voltage is shorted to the V
<CE Pin>
The IC's internal circuitry can be shutdown via the signal from the CE pin with the XC6501 series. In shutdown mode output at
the V
resistor is connected in parallel to R1 and R2 while the power supply is applied to the V
reaches the V
the correct output voltage for the CE pin, the 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 when medium voltage is input.
■NOTES ON USE
where V : Output voltage after discharge, V
τ: C
1
2. This IC achieves stable operation without an output capacitor C
L
.
High Speed Auto-Discharge Function>
Please use this IC within the stated absolute maximum ratings. The IC is liable to malfunction should the ratings be
exceeded.
impedance is high, operations may become unstable due to noise and/or phase lag depending on output current.
Please wire the input capacitor C
OUT
V = V
L
auto-discharge resistance Rdischg x Output capacitor C
pin will be pulled down to the V
OUT(E)
SS
level becomes short. The output voltage becomes unstable, when the CE pin is open. If this IC is used with
x e
–t/τ
, or t=
L
auto-discharge resistance value Rdischg and an output capacitor value C
τ
x In (V
SS
, its current flow reached and minimized to about 25mA.
OUT
IN
OUT(E)
L
SS
and the output capacitor C
auto-discharge resistance value is set at 400Ω(V
pin is then driven by the subsequent output signal. The output voltage at the V
level via R1 & R2. However, as for the XC6501B/D series, the C
L
/ V )
OUT(E)
is set by the C
: Output voltage, t : Discharge time,
L
auto-discharge resistance R and the output capacitor C
L
L
as close to the IC as possible.
L
by internal phase compensation. However, wiring
L
, when a low signal to the CE pin, which
IN
pin. Therefore, time until the V
OUT
=5.0V @ V
OUT
pin and the V
L
as τ (τ=C x
IN
=6.0V at typical).
L
auto-discharge
SS
pin as
XC6501
L
. By
OUT
OUT
Series
7/21
pin
pin