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参数资料
| 型号： | MAX8564EUB+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 10/15页 |
| 文件大小： | 266K |
| 描述： | IC REG CTRLR DUAL POS ADJ 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 正，可调式 |
| 输出数： | 2 |
| 输出电压： | 0.5 V ~ 1.8 V，0.5 V ~ 3.3 V |
| 电流 - 电源： | 660µA |
| 输入电压： | 5V，12V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-µMAX |
| 包装： | 管件 |
Set R
D
= 100k? The above equations also assume that
V
DD
> V
IN_
> 1V when V
IN_
is on or at a high-voltage
state, and that V
DD
> 3V.
Example: Connect 100k?from EN to V
DD
and 4k?from
EN_ to IN_. Thus, when V
DD
= 12V and V
IN
_ = 0V, then
V
EN
_ = 0.46V. When V
DD
= 12V and V
IN
_ = 1.2V, then
V
EN
_ = 1.6V.
Alternately, to avoid fault shutdown due to the delay of
V
IN
relative to V
DD
, pull EN_ low with a separate control
logic and only drive high when V
IN
reaches a steady-
state value.
Output Voltage
The output voltage range at the source of the n-MOSFET
is from 0.5V to 3.3V when V
DD
is 12V and from 0.5V to
1.8V when V
DD
is 5V. The maximum output voltage is a
function of the minimum gate-to-source voltage (V
GS
) of
the MOSFET and V
DD
.
The external n-MOSFET contains a parasitic diode from
source to drain. If the output is ever anticipated to
exceed the input, current flows from source to drain. If
this is undesirable, external protection is needed. A
simple solution is the placement of a diode in series,
from IN_ to the drain of the n-MOSFET, so that reverse
current is not possible. Due to the forward-voltage drop
of the diode, the maximum output voltage is reduced
and additional power is consumed in the diode.
Enable and POK
The MAX8563/MAX8564/MAX8564A have independent
enable control inputs (EN1, EN2, and EN3). Drive EN1
high to enable output 1. Drive EN2 high to enable out-
put 2. Drive EN3 high to enable output 3. When EN_ is
driven low, the corresponding DRV_ is internally pulled
to GND and POK_ is internally pulled low.
The POK_ is an open-drain output that provides the sta-
tus of the output voltage and pulls low depending upon
circuit conditions. During startup, once the FB_ reaches
the POK_ threshold, the POK_ signal goes high. The
POK_ threshold has 30mV of hysteresis. When the out-
put voltage drops 12% below the nominal regulated
voltage, POK_ pulls low. All POK_ outputs pull low
when UVLO is activated or when the internal VL regula-
tor and reference are not ready.
Output Undervoltage and
Overload Protection
When an overload event or short circuit occurs, the
device that is most vulnerable is the external n-MOSFET.
The MAX8563/MAX8564/MAX8564A monitor the output
voltage to protect the MOSFET. When DRV_ is at its maxi-
mum voltage and the output voltage drops below 80%
but is still greater than 60% of its nominal voltage for
more than 50祍, the MAX8563/MAX8564/MAX8564A
shut down that particular regulator output by pulling
DRV_ to GND. Note that there is an additional inherent
delay in turning off the MOSFET. The delay is a function
of the compensation capacitor and the MOSFET. If the
output recovers to greater than 80% within 50祍, it is not
considered to be in overload and no action is taken.
When the output voltage drops below 60% of its nominal
voltage, the MAX8563/MAX8564/MAX8564A immediately
shut down that particular regulator output by pulling
DRV_ to GND. To restart that particular LDO, V
DD
must
be recycled below the UVLO or the corresponding EN_
must be recycled. The overload protection is shown in
the Typical Operating Characteristics.
Design Procedure
Output Voltage Setting
The minimum output voltage for each controller of the
MAX8563/MAX8564/MAX8564A is typically 0.5V. The
maximum output voltage is adjustable up to 3.3V with
V
DD
= 12V, and up to 1.8V with V
DD
= 5V. To set the out-
put voltage, connect the FB_ pin to the center of a volt-
age-divider between OUT_ and GND (Figure 5). The
resistor-divider current should be at least 1mA per 1A of
maximum output current; i.e., for a 3A maximum output
current, set the resistor-divider bias current to e 3mA:
V
I
V
I
I
B
FB
OUT MIN
FB
OUT MAX
OUT MAX
(
)
(
)
(
)
d
=
?/DIV>
=
1000
500
I
I
OUT MIN
OUT MAX
(
)
(
)
e
1000
1 3
.
_
_
<
+
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
(
)
+
R
R R
V
V
V
E
E
D
DD IN
IN
?%, Ultra-Low Output Voltage, Dual and Triple
Linear n-FET Controllers
10 ______________________________________________________________________________________
MAX8563
MAX8564
MAX8564A
EN_
V
DD
IN_
R
D
R
E
Figure 4. Voltage-Divider on EN_
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8564EUB+ | 功能描述:低压差控制器 - LDO Dual & Triple Linear n-FET Controller RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
| MAX8564EUB+T | 功能描述:低压差控制器 - LDO Dual & Triple Linear n-FET Controller RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
| MAX8564EUB-T | 功能描述:低压差控制器 - LDO RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
| MAX8564EVKIT | 制造商:Maxim Integrated Products 功能描述:1%, ULTRA-LOW OUTPUT-VOLTAGE, DUAL AND TRIPL - Bulk |
| MAX8566ETJ | 功能描述:电压模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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