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參數(shù)資料
| 型號： | MCP1827 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| 中文描述： | 1.5安培的電流，低電壓，低靜態(tài)電流LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 695K |
| 代理商： | MCP1827 |
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MCP1827/MCP1827S
DS22001C-page 18
2007 Microchip Technology Inc.
the 30 μs delay, the LDO output enters its soft-start
period as it rises from 0V to its final regulation value. If
the SHDN input signal is pulled low during the 30 μs
delay period, the timer will be reset and the delay time
will start over again on the next rising edge of the
SHDN input. The total time from the SHDN input going
high (turn-on) to the LDO output being in regulation is
typically 100 μs. See Figure 4-4 for a timing diagram of
the SHDN input.
FIGURE 4-4:
Diagram.
Shutdown Input Timing
4.7
Dropout Voltage and Undervoltage
Lockout
Dropout voltage is defined as the input-to-output
voltage differential at which the output voltage drops
2% below the nominal value that was measured with a
V
R
+
0.6V
differential
MCP1827/MCP1827S LDO has a very low dropout
voltage specification of 330 mV (typical) at 1.5A of out-
put current. See
Section 1.0 “Electrical Characteris-
tics”
for maximum dropout voltage specifications.
applied.
The
The MCP1827/MCP1827S LDO operates across an
input voltage range of 2.3V to 6.0V and incorporates
input Undervoltage Lockout (UVLO) circuitry that keeps
the LDO output voltage off until the input voltage
reaches a minimum of 2.18V (typical) on the rising
edge of the input voltage. As the input voltage falls, the
LDO output will remain on until the input voltage level
reaches 2.04V (typical).
Since the MCP1827/MCP1827S LDO undervoltage
lockout activates at 2.04V as the input voltage is falling,
the dropout voltage specification does not apply for
output voltages that are less than 1.9V.
For high-current applications, voltage drops across the
PCB traces must be taken into account. The trace
resistances can cause significant voltage drops
between the input voltage source and the LDO. For
applications with input voltages near 2.3V, these PCB
trace voltage drops can sometimes lower the input
voltage enough to trigger a shutdown due to
undervoltage lockout.
4.8
Overtemperature Protection
The
ture-sensing circuitry to prevent the junction tempera-
ture from exceeding approximately 150
°
C. If the LDO
junction temperature does reach 150
°
C, the LDO
output will be turned off until the junction temperature
cools to approximately 140
°
C, at which point the LDO
output will automatically resume normal operation. If
the internal power dissipation continues to be
excessive, the device will again shut off. The junction
temperature of the die is a function of power
dissipation, ambient temperature and package thermal
resistance. See
Section 5.0 “Application Cir-
cuits/Issues”
for more information on LDO power
dissipation and junction temperature.
MCP1827/MCP1827S LDO has
tempera-
SHDN
V
OUT
30 μs
70 μs
T
OR
400 ns (typ)
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| MCP1827-0802E/AT | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1827-0802E/ET | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1827-1202E/AT | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1827-1202E/ET | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1827-1802E/AT | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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