参数资料
| 型号： | LT3023IMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .1A 10-MSOP |
| 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： | 1.22 V ~ 20 V |
| 输入电压： | 1.8 V ~ 20 V |
| 电压 - 压降（标准）： | 0.3V @ 100mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 110mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
LT3023
APPLICATIONS INFORMATION
( )( )
R 1 ? ?
V OUT = 1 . 22 V ? 1 + + I ADJ R 2
The LT3023 is a dual 100mA low dropout regulator with
micropower quiescent current and shutdown. The device
is capable of supplying 100mA per channel at a dropout
voltage of 300mV. Output voltage noise can be lowered
to 20μV RMS over a 10Hz to 100kHz bandwidth with the
addition of a 0.01μF reference bypass capacitor. Addition-
V IN
IN
OUT1/OUT2
LT3023
ADJ1/ADJ2
GND
+
R2
R1
3023 F01
V OUT
? R2 ?
?
V ADJ = 1 . 22 V
I ADJ = 30 nA AT 25 ° C
OUTPUT RANGE = 1.22V TO 20V
ally, the reference bypass capacitor will improve transient
response of the regulator, lowering the settling time for
transient load conditions. The low operating quiescent
current (20μA per channel) drops to less than 1μA in
shutdown. In addition to the low quiescent current, the
LT3023 regulator incorporates several protection features
which make it ideal for use in battery-powered systems.
The device is protected against both reverse input and
reverse output voltages. In battery backup applications
where the output can be held up by a backup battery when
the input is pulled to ground, the LT3023 acts like it has a
diode in series with its output and prevents reverse current
?ow. Additionally, in dual supply applications where the
regulator load isreturned to a negative supply, the output
can be pulled below ground by as much as 20V and still
allow the device to start and operate.
Adjustable Operation
The LT3023 has an output voltage range of 1.22V to 20V.
The output voltage is set by the ratio of two external resis-
tors as shown in Figure 1. The device servos the output
to maintain the corresponding ADJ1/ADJ2 pin voltage
at 1.22V referenced to ground. The current in R1 is then
equal to 1.22V/R1 and the current in R2 is the current in
R1 plus the ADJ1/ADJ2 pin bias current. The ADJ1/ADJ2
pin bias current, 30nA at 25°C, ?ows through R2 into the
ADJ1/ADJ2 pin. The output voltage can be calculated us-
ing the formula in Figure 1. The value of R1 should be no
greater than 250k to minimize errors in the output voltage
caused by the ADJ1/ADJ2 pin bias current. Note that in
shutdown the output is turned off and the divider current will
be zero. Curves of ADJ1/ADJ2 Pin Voltage vs Temperature
Figure 1. Adjustable Operation
The device is tested and speci?ed with the ADJ1/ADJ2
pin tied to the corresponding OUT1/OUT2 pin for an out-
put voltage of 1.22V. Speci?cations for output voltages
greater than 1.22V will be proportional to the ratio of the
desired output voltage to 1.22V: V OUT /1.22V. For example,
load regulation for an output current change of 1mA to
100mA is –1mV typical at V OUT = 1.22V. At V OUT = 12V,
load regulation is:
(12V/1.22V)(–1mV) = – 9.8mV
Bypass Capacitance and Low Noise Performance
The LT3023 regulator may be used with the addition of a
bypass capacitor from V OUT to the corresponding BYP1/
BYP2 pin to lower output voltage noise. A good quality
low leakage capacitor is recommended. This capacitor
will bypass the reference of the regulator, providing a
low frequency noise pole. The noise pole provided by this
bypass capacitor will lower the output voltage noise to
as low as 20μV RMS with the addition of a 0.01μF bypass
capacitor. Using a bypass capacitor has the added bene?t
of improving transient response. With no bypass capacitor
and a 10μF output capacitor, a 10mA to 100mA load step
will settle to within 1% of its ?nal value in less than 100μs.
With the addition of a 0.01μF bypass capacitor, the output
will stay within 1% for a 10mA to 100mA load step (see
Transient Reponse in Typical Performance Characteristics
section). However, regulator start-up time is proportional
to the size of the bypass capacitor, slowing to 15ms with
a 0.01μF bypass capacitor and 10μF output capacitor.
and ADJ1/ADJ2 Pin Bias Current vs Temperature appear
in the Typical Performance Characteristics.
3023fa
9
相关PDF资料 |
PDF描述 |
|---|---|
| LT1521CST-3#TR | IC REG LDO 3V .3A SOT223-3 |
| LT1521CST-5#TR | IC REG LDO 5V .3A SOT223-3 |
| LT1521CST-3.3#TR | IC REG LDO 3.3V .3A SOT223-3 |
| LT1763CS8-3#TR | IC REG LDO 3V .5A 8SOIC |
| MIC5371-PMYMT TR | IC REG LDO 3V/2.8V .15A 6TMLF |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3024 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulator |
| LT3024_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual 100mA/500mA Low Dropout, Low Noise,Micropower Regulator |
| LT3024EDE | 功能描述:IC REG LDO ADJ .5A/.1A 12DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:800 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:最高 16V 电压 - 压降（标准）:0.7V @ 4A 稳压器数量:1 电流 - 输出:4A 电流 - 限制（最小）:4.2A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-6，D²Pak（5 引线+接片），TO-263BA 供应商设备封装:TO-263-5 包装:带卷 (TR) 其它名称:AP1184K525L-13AP1184K525LDITR |
| LT3024EDE#PBF | 功能描述:IC REG LDO ADJ .5A/.1A 12-DFN 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 |
| LT3024EDE#TR | 功能描述:IC REG LDO ADJ .5A/.1A 12DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:800 系列:- 稳压器拓扑结构:正，固定式 输出电压:2.5V 输入电压:最高 16V 电压 - 压降（标准）:0.7V @ 4A 稳压器数量:1 电流 - 输出:4A 电流 - 限制（最小）:4.2A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-263-6，D²Pak（5 引线+接片），TO-263BA 供应商设备封装:TO-263-5 包装:带卷 (TR) 其它名称:AP1184K525L-13AP1184K525LDITR |
发布紧急采购，3分钟左右您将得到回复。