参数资料
| 型号： | SC553ISKTRT |
| 厂商： | Semtech |
| 文件页数： | 5/7页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .15A SOT-23-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 6 V |
| 输入电压： | 2.25 V ~ 6.5 V |
| 电压 - 压降（标准）： | 0.15V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA |
| 电流 - 限制（最小）： | 400mA |
| 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-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 1358 (CN2011-ZH PDF) |
| 其它名称： | SC553ISKDKR |
POWER MANAGEMENT
Marking Information
NOT RECOMMENDED FOR NEW DESIGN
SC553
Top Mark
553
Bottom Mark
yyww
yyww = Datecode (Example: 0108)
Applications Information
Theory Of Operation
The SC553 is intended for applications where very low
dropout voltage, low supply current and low output noise
are critical. It provides a very simple, low cost solution
that uses very little pcb real estate. Only two external
capacitors are required for operation.
The SC553 contains a bandgap reference trimmed for
optimal temperature coefficient which is fed into the
inverting input of an error amplifier. The output voltage
of the regulator is divided down externally using a
resistor divider and compared to the bandgap voltage
via the adjust pin (ADJ). The error amplifier drives the
gate of a low R DS(ON) P-channel MOSFET pass device to
maintain V OUT such that V ADJ = V REF .
An active high enable pin (EN) allows the regulator to be
shut down. Pulling this pin low causes the device to
enter a very low power shutdown mode, where it will draw
typically 0.1μA from the input supply.
The regulator has its own current limit circuitry to
Component Selection - General
Output capacitor - Semtech recommends a minimum
capacitance of 1μF at the output with an equivalent
series resistance (ESR) of < 1 ? over temperature. While
the SC553 has been designed to be used with ceramic
capacitors, it does not have to be used with ceramic
capacitors, allowing the designer a choice. Increasing the
bulk capacitance will further reduce output noise and
improve the overall transient response.
Input capacitor - Semtech recommends the use of a
1μF ceramic capacitor at the input. This allows for the
device being some distance from any bulk capacitance
on the rail. Additionally, input droop due to load transients
is reduced, improving overall load transient response.
External voltage selection resistors - the use of 1%
resistors, and designing for a current flow ≥ 10μA is
recommended to ensure a well regulated output (thus
R2 ≤ 125k ? ). The output voltage (referring to Figure 1
below) will be:
V OUT = 1 . 250 ? ? 1 +
?
ensure that the output current will not damage the
device during output short, overload or start-up. The
current limit is guaranteed to be greater than 400mA to
allow fast charging of the output capacitor and high
?
?
R1 ?
R 2 ?
initial currents for DSP initialization.
VIN
1
U1
IN
SC553
OUT
5
VOUT
The SC553 includes thermal shutdown circuitry to turn
off the device if T J exceeds 150°C (typical), with the
device remaining off until T J drops by 15°C (typical).
Reverse battery protection circuitry ensures that the
C1
1uF
3
EN
GND ADJ
2
4
R1
R2
C2
1uF
device cannot be damaged if the input supply is
accidentally reversed, limiting the reverse current to less
than 1.5mA.
Figure 1
? 2004 Semtech Corp.
5
www.semtech.com
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