参数资料
型号: XC6221A302MR-G
厂商: Torex Semiconductor Ltd
文件页数: 8/28页
文件大小: 0K
描述: IC REG LDO 3V .2A SOT-25
特色产品: XC6221 LDO Voltage Regulators
标准包装: 1
稳压器拓扑结构: 正,固定式
输出电压: 3V
输入电压: 最高 6V
电压 - 压降(标准): 0.08V @ 100mA
稳压器数量: 1
电流 - 输出: 200mA(最小)
电流 - 限制(最小): 200mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: SC-74A,SOT-753
供应商设备封装: SOT-25
包装: 标准包装
产品目录页面: 1439 (CN2011-ZH PDF)
其它名称: 893-1093-6
XC6221 Series
■ OPERATIONAL EXPLANATION
<Output Voltage Control>
The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The
P-channel MOSFET connected to the V OUT pin, is then driven by the subsequent output signal. The output voltage at the
V OUT pin 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.
CE
ON/OFF
Control
V IN
-
Error
Current
CE
CE/
+
Amp
Limit
each
circuit
R1
Rdischg
V OUT
CE/
R2
Voltage
Reference
V SS
<Input and Output Capacitors>
The XC6221 needs an output capacitor C L for phase compensation. Values required for the phase compensation are
shown in the chart below. If a loss of the capacitance happens, the stable phase compensation may not be obtained.
Please ensure to use a capacitor which does not depend on bias or temperature too much. For a stable power input,
please connect an input capacitor C IN of 1.0 μ F between the V IN pin and the V SS pin.
● Except USPN-4
OUTPUT VOLTAGE (V)
OUTPUT CAPACITOR VALUE
0.80V ~ 1.15V
1.20V ~ 1.35V
1.40V ~ 4.00V
4.05V ~ 5.00V
● USPN-4
C L
C L
C L
C L
≧ 4.7 μ F
≧ 2.2 μ F
≧ 1.0 μ F
≧ 2.2 μ F
OUTPUT VOLTAGE (V)
1.20V ~ 4.00V
4.05V ~ 5.00V
OUTPUT CAPACITOR VALUE
C L ≧ 2.2 μ F
C L ≧ 4.7 μ F
<C L Auto-Discharge Function>
XC6221B/D series can discharge the electric charge in the output capacitor (C L ), when a low signal to the CE pin, which
enables the whole IC circuit to be turned off, is inputted via the N-channel transistor and C L auto-discharge resistance
(R DCHG ) located between the V OUT pin and the V SS pin (cf. BLOCK DIAGRAM). The C L auto-discharge resistance (R DCHG )
value is set at 780 Ω (V OUT =4.0V @ V IN =6.0V at typical). The discharge time of the output capacitor (C L ) is set by the C L
auto-discharge resistance (R DCHG ) and the output capacitor (C L ). By setting the time constant of the C L auto-discharge
resistance value [R DCHG ] and the output capacitor value (C L ) as τ ( τ =C L x R DCHG ), the output voltage after discharge via
the N-channel transistor is calculated by the following formula.
V = V OUT(E) x e –t/ τ , or t= τ In ( V / V OUT(E) )
where
V : Output voltage after discharge
V OUT (E) : Output voltage
t : Discharge time
τ : C L auto-discharge resistance R DCHG × Output capacitor value C L
8/28
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