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| 型号： | ADP3335ARMZ-3.3-RL2 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.37 V DROPOUT, PDSO8 |
| 封装： | LEAD FREE, MO-187AA, MSOP-8 |
| 文件页数： | 16/16页 |
| 文件大小： | 442K |
| 代理商： | ADP3335ARMZ-3.3-RL2 |
ADP3335
Rev. A | Page 9 of 16
THEORY OF OPERATION
The ADP3335 uses a single control loop for regulation and
reference functions. The output voltage is sensed by a resistive
voltage divider, 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.
INPUT
00147-0-023
OUTPUT
COMPENSATION
CAPACITOR
R2
R1
GND
ADP3335
PTAT
CURRENT
R4
PTAT
VOS
gm
Q1
ATTENUATION
(VBANDGAP/VOUT)
R3 D1
(a)
CLOAD
RLOAD
NONINVERTING
WIDEBAND
DRIVER
Figure 23. Functional Block Diagram
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
proportional offset voltage combines with the complementary
diode voltage to form a virtual band gap voltage implicit in the
network, although it never appears explicitly in the circuit.
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 flexibility in
the trade-off of noise sources that leads to a low noise design.
The R1 and R2 divider is chosen in the same ratio as the band
gap voltage to the output voltage. Although the R1 and R2
resistor divider is loaded by the D1 diode and a second
divider—R3 and R4, the values can be chosen to produce a
temperature 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.
The patented amplifier controls a new and unique noninverting
driver that drives the pass transistor, Q1. This special nonin-
verting driver enables the frequency compensation to 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
resistance. The ESR value required to keep conventional LDOs
stable, moreover, 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 ADP3335, ESR limitations are no longer a source of
design constraints. The ADP3335 can be used with virtually any
good quality capacitor and with no constraint on the minimum
ESR. This innovative design allows the circuit to be stable with
just a small 1 F capacitor on the output. Additional advantages
of the pole-splitting scheme include superior line noise reject-
tion and very high regulator gain, which lead to excellent line
and load regulation. Impressive ±1.8% accuracy is guaranteed
over line, load, and temperature.
Additional features of the circuit include current limit, thermal
shutdown, and noise reduction.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3335ARMZ-5-R7 | 功能描述:IC REG LDO 5V .5A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 标准包装:1 系列:anyCAP® 稳压器拓扑结构:正，固定式 输出电压:3.3V 输入电压:最高 6V 电压 - 压降（标准）:0.23V @ 1.5A 稳压器数量:1 电流 - 输出:1.5A 电流 - 限制（最小）:- 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:Digi-Reel® 其它名称:ADP3339AKCZ-3.3-RLDKR |
| ADP3335ARMZ-5-REEL | 功能描述:IC REG LDO 5V .5A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:anyCAP® 标准包装:75 系列:- 稳压器拓扑结构:正，可调式 输出电压:1.2 V ~ 37 V 输入电压:4.2 V ~ 40 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:500mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:TO-252-3，DPak（2 引线+接片），SC-63 供应商设备封装:TO-252-3 包装:管件 产品目录页面:1286 (CN2011-ZH PDF) 其它名称:*LM317AMDT/NOPBLM317AMDT |
| ADP3336 | 制造商:AD 制造商全称:Analog Devices 功能描述:High Accuracy Ultralow IQ, 500 mA anyCAP Adjustable Low Dropout Regulator |
| ADP3336ARM-REEL | 制造商:Analog Devices 功能描述:LDO Regulator Pos 1.5V to 10V 0.8A 8-Pin MSOP T/R |
| ADP3336ARM-REEL7 | 功能描述:IC REG LDO ADJ .5A 8-MSOP 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 |
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