参数资料
| 型号： | LTC1844ES5-SD#TR |
| 厂商： | Linear Technology |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .15A TSOT23-5 |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.25 V ~ 6 V |
| 输入电压： | 1.6 V ~ 6.5 V |
| 电压 - 压降（标准）： | 0.135V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA（最小值） |
| 电流 - 限制（最小）： | 160mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-5 细型，TSOT-23-5 |
| 供应商设备封装： | TSOT-23-5 |
| 包装： | 带卷 (TR) |
LTC1844 Series
APPLICATIO N S I N FOR M ATIO N
temperature and applied voltage. The most common di-
electrics used are Z5U, Y5V, X5R and X7R. The Z5U and
Y5V dielectrics are good for providing high capacitances
in a small package, but exhibit strong voltage and tem-
perature coefficients as shown in Figures 4 and 5. When
used with a 5V regulator, a 10 μ F Y5V capacitor can exhibit
an effective value as low as 1 μ F to 2 μ F over the operating
temperature range. The X5R and X7R dielectrics result in
more stable characteristics and are more suitable for use
as the output capacitor. The X7R type has better stability
across temperature, while the X5R is less expensive and
is available in higher values.
Additionally, some ceramic capacitors have a piezoelectric
response. A piezoelectric device generates voltage across
its terminals due to mechanical stress, similar to the way
a piezoelectric accelerometer or microphone works. For a
ceramic capacitor the stress can be induced by vibrations
in the system or thermal transients. The resulting voltages
produced can cause appreciable amounts of noise, espe-
cially when a ceramic capacitor is used for noise bypass-
ing. A ceramic capacitor produced Figure 6’s trace in
response to light tapping from a pencil. Similar vibration-
induced behavior can masquerade as increased output
voltage noise.
20
0
–20
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10 μ F
X5R
V OUT
500 μ V/DIV
LTC1844-2.8
C OUT = 10 μ F
C BYP = 0.01 μ F
I LOAD = 100mA
–40
–60
Y5V
–80
100ms/DIV
1844 F06
–100
0
2
4
6
8
10
12
14
16
DC BIAS VOLTAGE (V)
1844 F04
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
Figure 4. Ceramic Capacitor DC Bias Characteristics
40
20
Dropout Recovery and Output Overshoot
If the input supply voltage drops too low for the LTC1844
to maintain regulation, the internal feedback loop goes
0
–20
–40
–60
Y5V
X5R
into dropout and the internal pass transistor turns fully on.
If the input supply then suddenly rises, the output may
briefly overshoot the intended output voltage while the
LTC1844 transitions back from dropout to normal opera-
tion. This behavior occurs when the input supply slew rate
is greater than 1V/ms and the output bypass capacitor is
–80
–100
BOTH CAPACITORS ARE 16V,
1210 CASE SIZE, 10 μ F
–50 –25 0 25 50 75
TEMPERATURE ( ° C)
100
125
small. If the input is expected to slew rapidly, an output
bypass capacitor of 10 μ F or greater should be used to
minimize output overshoot. Note that overshoot typically
1844 F05
Figure 5. Ceramic Capacitor Temperature Characteristics
does not occur at start-up since the feedback loop does
not spend a significant amount of time in dropout.
1844fa
9
相关PDF资料 |
PDF描述 |
|---|---|
| LTC1844ES5-1.5#TRPBF | IC REG LDO 1.5V .15A TSOT23-5 |
| GMC25DRXI-S734 | CONN EDGECARD 50POS DIP .100 SLD |
| LTC1844ES5-1.5#TR | IC REG LDO 1.5V .15A TSOT23-5 |
| LTC1844ES5-2.5#TRPBF | IC REG LDO 2.5V .15A TSOT23-5 |
| LTC1844ES5-2.5#TR | IC REG LDO 2.5V .15A TSOT23-5 |
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