参数资料
| 型号： | LTC3026EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/18页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1.5A 10-DFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 121 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 0.4 V ~ 2.6 V |
| 输入电压： | 1.14 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.1V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-DFN（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3026
OPERATION
The LTC3026 operates at a relatively high gain of
270μV/A referred to the ADJ input. Thus, a load current
change of 1mA to 1.5A produces a 400μV drop at the ADJ
input. To calculate the change in the output, simply mul-
tiply by the gain of the feedback network (i.e. 1 + R2/R1).
For example, to program the output for 1.2V choose
R2/R1 = 2. In this example an output current change of
1mA to 1.5A produces –400μV ? (1 + 2) = 1.2mV drop at
the output.
Power Good Operation
The LTC3026 includes an open-drain power good (PG)
output pin with hysteresis. If the chip is in shutdown or
under UVLO conditions (V BST < 4.25V), PG is low im-
pedance to ground. PG becomes high impedance when
V OUT rises to 93% of its regulation voltage. PG stays high
impedance until V OUT falls back down to 91% of its regula-
tion value. A pull-up resistor can be inserted between PG
and a positive logic supply (such as IN, OUT, BST, etc.)
to signal a valid power good condition. V IN should be the
minimum operating voltage (1.14V) or greater for PG to
function correctly.
Output Capacitance and Transient Response
The LTC3026 is designed to be stable with a wide range
of ceramic output capacitors. The ESR of the output
capacitor affects stability, most notably with small ca-
pacitors. An output capacitor of 10μF or greater with an
ESR of 0.05Ω or less is recommended to ensure stability.
The LTC3026 is a micropower device and output transient
response will be a function of output capacitance. Larger
values of output capacitance decrease the peak deviations
and provide improved transient response for larger load
current changes. Note that bypass capacitors used to
decouple individual components powered by the LTC3026
will increase the effective output capacitor value. High
ESR tantalum and electrolytic capacitors may be used,
but a low ESR ceramic capacitor must be in parallel at the
output. There is no minimum ESR or maximum capacitor
size requirements.
Extra consideration must be given to the use of ceramic
capacitors. Ceramic capacitors are manufactured with a
variety of dielectrics, each with different behavior across
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 2V regulator, a 10μF Y5V capacitor can exhibit
an effective value as low as 1μF to 2μF 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.
A minimum capacitance of 5μF must be maintained at all
times on the LTC3026 LDO output.
20
0
BOTH CAPACITORS ARE 10μF,
6.3V, 0805 CASE SIZE
20
0
X5R
X5R
–20
–40
–60
Y5V
–20
–40
–60
Y5V
–80
–100
0
1
2 3 4
5
6
–80
BOTH CAPACITORS ARE 10μF,
6.3V, 0805 CASE SIZE
–100
–50 –25 0 25
50
75
DC BIAS VOLTAGE (V)
3026 F04
TEMPERATURE (°C)
3026 F05
Figure 4. Ceramic Capacitor DC Bias Characteristics
Figure 5. Ceramic Capacitor Temperature Characteristics
3026ff
11
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| LTC3026EDDTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A Low Input Voltage VLDO Linear Regulator |
| LTC3026EDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A Low Input Voltage VLDO Linear Regulator |
| LTC3026EMSE | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.4V to 2.6V 1.5A 10-Pin MSOP EP |
| LTC3026EMSE#PBF | 功能描述:IC REG LDO ADJ 1.5A 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:8V 输入电压:10.5 V ~ 23 V 电压 - 压降（标准）:1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA（最小值） 电流 - 限制（最小）:- 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1 |
| LTC3026EMSE#PBF | 制造商:Linear Technology 功能描述:Linear Voltage Regulator IC |
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