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| 型号： | MAX8866REUA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.8V/ADJ .1A 8UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 2.8V，1.25 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.055V @ 50mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 100mA（最小） |
| 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-uMAX |
| 包装： | 带卷 (TR) |
Dual, Low-Dropout, 100mA Linear Regulators
______________________________________________________________Pin Description
PIN
1
2
3
4
5
6
7
8
NAME
OUT1
IN
GND
OUT2
SET2
SHDN2
SHDN1
SET1
FUNCTION
Regulator 1 Output. Fixed or adjustable from 1.25V to 5.5V. Sources up to 100mA. Bypass with a 1μF
capacitor to GND.
Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 2μF to GND.
Ground. Solder to large pads or the circuit board ground plane to maximize thermal dissipation.
Regulator 2 Output. Fixed or adjustable from 1.25V to 5.5V. Sources up to 100mA. Bypass with a 1μF
capacitor to GND.
Feedback Input for Setting the Output 2 Voltage. Connect to GND to set the output voltage to the preset 2.80V
(MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T). Connect to an external resistor divider for adjustable-
output operation.
Active-Low Shutdown 2 Input. A logic low turns off regulator 2. On the MAX8866, a logic low also causes the
output voltage to discharge to GND. Connect to IN for normal operation.
Active-Low Shutdown 1 Input. A logic low turns off regulator 1. On the MAX8866, a logic low also causes the
output voltage to discharge to GND. Connect to IN for normal operation.
Feedback Input for Setting the Output 1 Voltage. Connect to GND to set the output voltage to the preset 2.80V
(MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T). Connect to an external resistor divider for adjustable-
output operation.
_______________Detailed Description
The MAX8865/MAX8866 are dual, low-dropout, low-qui-
escent-current linear regulators designed primarily for
battery-powered applications. They supply adjustable
1.25V to 5.5V outputs or preselected 2.80V
(MAX886_R), 2.84V (MAX886_S), or 3.15V (MAX886_T)
outputs for load currents up to 100mA. As illustrated in
Figure 1, these devices have a 1.25V reference and two
independent linear regulators. Each linear regulator
consists of an error amplifier, MOSFET driver, P-channel
pass transistor, Dual Mode? comparator, and internal
feedback voltage divider.
The 1.25V bandgap reference is connected to the error
amplifiers’ inverting inputs. Each error amplifier com-
pares this reference with the selected feedback voltage
and amplifies the difference. The MOSFET driver reads
the error signal and applies the appropriate drive to the
P-channel pass transistor. If the feedback voltage is
lower than the reference, the pass-transistor gate is
pulled lower, allowing more current to pass and
increasing the output voltage. If the feedback voltage is
too high, the pass-transistor gate is pulled up, allowing
less current to pass to the output.
The output voltage is fed back through either an inter-
nal resistor voltage divider connected to the OUT_ pin,
or an external resistor network connected to the SET_
pin. The Dual Mode comparator examines the SET_
voltage and selects the feedback path. If SET_ is below
60mV, internal feedback is used and the output voltage
is regulated to 2.80V for the MAX886_R, 2.84V for the
MAX886_S, or 3.15V for the MAX886_T. Both regulators
are preset for the same voltage. The reference and the
thermal sensor are shared between the regulators.
Duplicate blocks exist for current limiters, reverse bat-
tery protection, and shutdown logic.
Internal P-Channel Pass Transistor
The MAX8865/MAX8866 feature 1.1 ? typical P-channel
MOSFET pass transistors. This provides several advan-
tages over similar designs using PNP pass transistors,
including longer battery life.
The P-channel MOSFET requires no base-drive current,
which reduces quiescent current significantly. PNP-
based regulators waste considerable amounts of cur-
rent in dropout when the pass transistor saturates. They
also use high base-drive currents under large loads.
The MAX8865/MAX8866 do not suffer from these prob-
lems, and consume only 145μA of quiescent current,
whether in dropout, light load, or heavy load applica-
tions (see Typical Operating Characteristics).
Output Voltage Selection
The MAX8865/MAX8866 feature Dual Mode operation:
they operate in either a preset voltage mode or an
adjustable mode.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8866SEUA | 功能描述:低压差稳压器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8866SEUA+ | 功能描述:低压差稳压器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8866SEUA+T | 功能描述:低压差稳压器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8866SEUA-T | 功能描述:低压差稳压器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX8866TEUA | 功能描述:低压差稳压器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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