- 您现在的位置：买卖IC网 > PDF目录22074 > ADP3336ARM-REEL7 (Analog Devices Inc)IC REG LDO ADJ .5A 8-MSOP PDF资料下载
参数资料
| 型号： | ADP3336ARM-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .5A 8-MSOP |
| 设计资源： | Analog Audio Input, Class-D Output with ADAU1701, SSM2306, and ADP3336 (CN0162) |
| 标准包装： | 1 |
| 系列： | anyCAP® |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.5 V ~ 10 V |
| 输入电压： | 2.6 V ~ 12 V |
| 电压 - 压降（标准）： | 0.2V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 剪切带 (CT) |
| 其它名称： | ADP3336ARMREEL7CT |
ADP3336
THEORY OF OPERATION
The new anyCAP LDO ADP3336 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.
superior line noise rejection and very high regulator gain, which
leads to excellent line and load regulation. An impressive ± 1.8%
accuracy is guaranteed over line, load, and temperature.
Additional features of the circuit include current limit and ther-
mal shutdown.
APPLICATION INFORMATION
Capacitor Selection
INPUT
OUTPUT
Output Capacitors: as with any micropower device, output
Q1
V OS
CURRENT
COMPENSATION
CAPACITOR
PTAT
NONINVERTING
WIDEBAND g m
DRIVER
ADP3336
ATTENUATION
(V BANDGAP /V OUT )
R3 D1
FB
PTAT
R4
R1
(a)
R2
C LOAD
R LOAD
transient response is a function of the output capacitance. The
ADP3336 is stable with a wide range of capacitor values, types
and ESR (anyCAP). A capacitor as low as 1 μ F is all that is
needed for stability; larger capacitors can be used if high output
current surges are anticipated. The ADP3336 is stable with
extremely low ESR capacitors (ESR ≈ 0), such as multilayer
ceramic capacitors (MLCC) or OSCON. Note that the effective
capacitance of some capacitor types may fall below the mini-
GND
Figure 2. 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 pro-
duces a large, temperature-proportional input, “offset voltage”
that is repeatable and very well controlled. The temperature-
proportional offset voltage is combined with the complementary
diode voltage to form a “virtual bandgap” voltage, 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 flexibil-
ity 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 bandgap
voltage to the output voltage. Although the R1, R2 resistor divider
is loaded by the diode D1 and a second divider consisting of 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. The use of this special
noninverting driver enables the frequency compensation to
include the load capacitor in a pole-splitting arrangement to
mum at cold temperature. Ensure that the capacitor provides
more than 1 μ F at minimum temperature.
Input Bypass Capacitor
An input bypass capacitor is not strictly required but is advisable
in any application involving long input wires or high source
impedance. Connecting a 1 μ F capacitor from IN to ground
reduces the circuit's sensitivity to PC board layout. If a larger
value output capacitor is used, then a larger value input capaci-
tor is also recommended.
Noise Reduction
A noise reduction capacitor (C NR ) can be placed between
the output and the feedback pin to further reduce the noise by
6 dB–10 dB (TPC 18). Low leakage capacitors in 100 pF–500 pF
range provide the best performance. Since the feedback pin (FB)
is internally connected to a high impedance node, any connection
to this node should be carefully done to avoid noise pickup from
external sources. The pad connected to this pin should be as
small as possible and long PC board traces are not recommended.
When adding a noise reduction capacitor, maintain a mini-
mum load current of 1 mA when not in shutdown.
It is important to note that as C NR increases, the turn-on time
will be delayed. With C NR values greater than 1 nF, this delay
may be on the order of several milliseconds.
achieve reduced sensitivity to the value, type, and ESR of the
load capacitance.
IN
ADP3336
OUT
Most LDOs place very strict requirements on the range of ESR
V IN
C IN
IN
OUT
values for the output capacitor because they are difficult to stabilize
due to the uncertainty of load capacitance and resistance. More-
over, the ESR value, required to keep conventional LDOs stable,
changes depending on load and temperature. These ESR limita-
1 F
OFF
ON
SD
GND
OUT
FB
C NR
R1
V OUT
C OUT
1 F
tions make designing with LDOs more difficult because of their
unclear specifications and extreme variations over temperature.
With the ADP3336 anyCAP LDO, this is no longer true. It can
be used with virtually any good quality capacitor, with no con-
straint on the minimum ESR. This innovative design allows the
circuit to be stable with just a small 1 μ F capacitor on the out-
put. Additional advantages of the pole-splitting scheme include
–6 –
R2
Figure 3. Typical Application Circuit
REV. A
相关PDF资料 |
PDF描述 |
|---|---|
| HSM36DSES-S243 | CONN EDGECARD 72POS .156 EYELET |
| HMM36DSES-S243 | CONN EDGECARD 72POS .156 EYELET |
| RW2-2415S | CONV DC/DC 2W 18-36VIN 15VOUT |
| ADP3330ART-3.3-RL7 | IC REG LDO 3.3V .2A SOT-23-6 |
| 1N5404G-T | RECTIFIER GPP 400V 3A DO-201AD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3336ARMZ | 制造商:Analog Devices 功能描述:LDO 2.6-12V 0.5A 1.5-10V 8 制造商:Analog Devices 功能描述:LDO, 2.6-12V, 0.5A, 1.5-10V, 8MSOP; Primary Input Voltage:12V; Dropout Voltage Vdo:200mV; Voltage Regulator Case Style:MSOP; No. of Pins:8; Output Current:500mA; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:-;;RoHS Compliant: Yes |
| ADP3336ARMZ-REEL | 制造商:Analog Devices 功能描述:LDO Regulator Pos 1.5V to 10V 0.8A 8-Pin MSOP T/R 制造商:Analog Devices 功能描述:LDO ADJ 0.5A SMD MSOP8 3336 |
| ADP3336ARMZ-REEL7 | 功能描述:IC REG LDO ADJ .5A 8-MSOP 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 |
| ADP3336ARMZ-REEL7 | 制造商:Analog Devices 功能描述:IC, ADJ LDO REG, 1.5V TO 10V 0.5A 8-SOIC |
| ADP3338 | 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 |
发布紧急采购，3分钟左右您将得到回复。