参数资料
| 型号： | ADP3338AKC-3-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V 1A SOT223 |
| 标准包装： | 1 |
| 系列： | anyCAP® |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 最高 8V |
| 电压 - 压降（标准）： | 0.19V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223-3 |
| 包装： | 标准包装 |
| 其它名称： | ADP3338AKC-3-RLDKR |
ADP3338
THEORY OF OPERATION
The ADP3338 anyCAP LDO uses a single control loop for
regulation and reference functions. The output voltage is sensed
by a resistive voltage divider, consisting of R1 and R2, which is
varied to provide the available output voltage option. Feedback
is taken from this network by way of a series diode (D1) and a
second resistor divider (R3 and R4) to the input of an amplifier.
A very high gain error amplifier is used to control this loop. The
amplifier is constructed in such a way that equilibrium produces
a large, temperature-proportional input offset voltage that is
repeatable and very well controlled. The temperature-propor-
tional offset voltage is combined with the complementary diode
voltage to form a virtual band gap voltage that is implicit in the
network, although it never appears explicitly in the circuit.
Ultimately, this patented design makes it possible to control the
loop with only one amplifier. This technique also improves the
noise characteristics of the amplifier by providing more flexi-
bility on the trade off of noise sources that leads to a low noise
design.
The R1, R2 divider is chosen in the same ratio as the band gap
voltage to the output voltage. Although the R1, R2 resistor
divider is loaded by Diode D1 and a second divider consisting
of R3 and R4, the values can be chosen to produce a tempera-
include the load capacitor in a pole-splitting arrangement to
achieve reduced sensitivity to the value, type, and ESR of the
load capacitance.
Most LDOs place very strict requirements on the range of ESR
values for the output capacitor because they are difficult to
stabilize due to the uncertainty of load capacitance and resis-
tance. Moreover, the ESR value required to keep conventional
LDOs stable changes depending on load and temperature.
These ESR limitations make designing with LDOs more
difficult because of their unclear specifications and extreme
variations over temperature.
With the ADP3338 anyCAP LDO, this is no longer true. It can
be used with virtually any good quality capacitor, with no
constraint on the minimum ESR. This innovative design
provides circuit stability with just a small 1 μF capacitor on the
output. Additional advantages of the pole-splitting scheme
include superior line noise rejection and very high regulator
gain to achieve excellent line and load regulation. An impressive
±1.4% accuracy is guaranteed over line, load, and temperature.
Additional features of the circuit include current limit and
thermal shutdown.
ture-stable output. This unique arrangement specifically corrects
for the loading of the divider, thus avoiding the error resulting
from base current loading in conventional circuits.
V IN
C1
1 μ F
IN
OUT
GND
C2
1 μ F
V OUT
The patented amplifier controls a new and unique noninverting
ADP3338
driver that drives the pass transistor, Q1. The use of this special
noninverting driver enables the frequency compensation to
Figure 20. Typical Application Circuit
INPUT
OUTPUT
Q1
COMPENSATION
CAPACITOR
ATTENUATION
(V BANDGAP /V OUT )
R1
NONINVERTING
WIDEBAND
g m
PTAT
V OS
R3
D1
(a)
C LOAD
DRIVER
ADP3338
R4
PTAT
CURRENT
R2
R LOAD
GND
Figure 21. Functional Block Diagram
Rev. B | Page 9 of 16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3338AKC-3-RL7 | 制造商:Analog Devices 功能描述:LDO Regulator Pos 3V 1.6A 4-Pin(3+Tab) SOT-223 T/R |
| ADP3338AKC-5 | 制造商:AD 制造商全称:Analog Devices 功能描述:High-Accuracy Ultralow IQ, 1 A, anyCAP Low Dropout Regulator |
| ADP3338AKC-5-REEL | 制造商:AD 制造商全称:Analog Devices 功能描述:High Accuracy, Ultralow IQ, 1A, anyCAP Low Dropout Regulator |
| ADP3338AKC-5-REEL7 | 功能描述:IC REG LDO 5V 1A SOT-223 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式和可调式 输出电压:3.3V，1.25 V ~ 5.7 V 输入电压:4.5 V ~ 7 V 电压 - 压降（标准）:1.1V @ 1A 稳压器数量:2 电流 - 输出:1A 电流 - 限制（最小）:1A 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-5，DPak（4 引线 + 接片），TO-252AD 供应商设备封装:PPAK 包装:管件 其它名称:497-3576-5 |
| ADP3338AKCZ-1.5-R7 | 功能描述:IC REG LDO 1.5V 1A SOT-223 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 产品培训模块:MIC5365/66 Ultra-small LDO Regulators 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:最高 5.5V 电压 - 压降（标准）:0.155V @ 150mA 稳压器数量:1 电流 - 输出:150mA 电流 - 限制（最小）:200mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:4-UDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1x1） 包装:Digi-Reel® 其它名称:576-3192-6 |
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