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參數(shù)資料
| 型號(hào)： | MAX8866 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual, Low-Dropout, 100mA Linear Regulators(雙組,低輸出壓降,100mA線性穩(wěn)壓器) |
| 中文描述： | 雙路、低壓差、100mA線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 195K |
| 代理商： | MAX8866 |
M
Dual, Low-Dropout, 100mA Linear Regulators
_______________________________________________________________________________________
7
_______________Detailed Desc ription
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 T ransistor
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 V oltage S elec tion
The MAX8865/MAX8866 feature Dual Mode operation:
they operate in either a preset voltage mode or an
adjustable mode.
______________________________________________________________Pin Desc ription
Regulator 1 Output. Fixed or adjustable from 1.25V to 5.5V. Sources up to 100mA. Bypass with a 1μF
capacitor to GND.
OUT1
1
PIN
FUNCTION
NAME
IN
2
Regulator Input. Supply voltage can range from +2.5V to +5.5V. Bypass with 2μF to GND.
3
Ground. Solder to large pads or the circuit board ground plane to maximize thermal dissipation.
OUT2
4
Regulator 2 Output. Fixed or adjustable from 1.25V to 5.5V. Sources up to 100mA. Bypass with a 1μF
capacitor to GND.
GND
SET2
5
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.
SET1
6
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.
SHDN1
7
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.
8
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.
SHDN2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8866REUA | 功能描述:低壓差穩(wěn)壓器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8866REUA+ | 功能描述:低壓差穩(wěn)壓器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8866REUA+T | 功能描述:低壓差穩(wěn)壓器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8866REUA-T | 功能描述:低壓差穩(wěn)壓器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8866SEUA | 功能描述:低壓差穩(wěn)壓器 - LDO 100mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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