- 您現(xiàn)在的位置：買(mǎi)賣(mài)IC網(wǎng) > PDF目錄385553 > MAX8864R (Maxim Integrated Products, Inc.) Low-Dropout, 100mA Linear Regulators(100mA,低壓差線性穩(wěn)壓器,SOT23封裝) PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX8864R |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Dropout, 100mA Linear Regulators(100mA,低壓差線性穩(wěn)壓器,SOT23封裝) |
| 中文描述： | 低壓差、120mA線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 129K |
| 代理商： | MAX8864R |
M
Low-Dropout, 100mA Linear Regulators
_______________________________________________________________________________________
7
Internal P-Channel Pass Transistor
The MAX8863/MAX8864 feature a 1.1
typical P-chan-
nel MOSFET pass transistor. This provides several
advantages over similar designs using PNP pass tran-
sistors, including longer battery life.
The P-channel MOSFET requires no base drive current,
which reduces quiescent current considerably. 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 MAX8863/MAX8864 do not suffer from these prob-
lems, and consume only 80μA of quiescent current,
whether in dropout, light load, or heavy load applica-
tions (see Typical Operating Characteristics).
Output V oltage S elec tion
The MAX8863/MAX8864 feature Dual Mode operation:
they operate in either a preset voltage mode or an
adjustable mode.
In preset voltage mode, internal, trimmed feedback
resistors set the MAX886_R output to 2.80V, the
MAX886_S output to 2.84V, and the MAX886_T output to
3.15V. Select this mode by connecting SET to ground.
In adjustable mode, select an output between 1.25V
and 5.5V using two external resistors connected as a
voltage divider to SET (Figure 2). The output voltage is
set by the following equation:
V
OUT
= V
SET
(1 + R1 / R2)
where V
SET
= 1.25V. To simplify resistor selection:
Choose R2 = 100k
to optimize power consumption,
accuracy, and high-frequency power-supply rejection.
The total current through the external resistive feedback
and load resistors should not be less than 10μA. Since
the V
SET
tolerance is typically less than ±25mV, the out-
put can be set using fixed resistors instead of trim pots.
Connect a 10pF to 25pF capacitor across R1 to com-
pensate for layout-induced parasitic capacitances.
In preset voltage mode, impedances between SET and
ground should be less than 100k
. Otherwise, spurious
conditions could cause the voltage at SET to exceed
the 60mV Dual Mode threshold.
S hutdown
A low input on the SHDN pin shuts down the
MAX8863/MAX8864. In shutdown mode, the pass tran-
sistor, control circuit, reference, and all biases are
turned off, reducing the supply current to typically
0.08nA. Connect SHDN to IN for normal operation. The
MAX8864 output voltage is actively discharged to
ground when the part is placed in shutdown (see
Typical Operating Characteristics).
Current Limit
The MAX8863/MAX8864 include a current limiter that
monitors and controls the pass transistor’s gate volt-
age, estimating the output current and limiting it to
about 220mA. For design purposes, the current limit
should be considered 120mA (min) to 320mA (max).
The output can be shorted to ground for an indefinite
time period without damaging the part.
T hermal Overload Protec tion
Thermal overload protection limits total power dissipa-
tion in the MAX8863/MAX8864. When the junction tem-
perature exceeds T
J
= +170°C, the thermal sensor
sends a signal to the shutdown logic, turning off the
pass transistor and allowing the IC to cool. The thermal
sensor will turn the pass transistor on again after the
IC’s junction temperature typically cools by 20°C,
resulting in a pulsed output during continuous thermal
overload conditions.
Thermal overload protection is designed to protect the
MAX8863/MAX8864 in the event of fault conditions.
Stressing the device with high load currents and high
input-output differential voltages (which result in die tem-
peratures above +125°C) may cause a momentary over-
shoot (2% to 8% for 200ms) when the load is completely
removed. This can be remedied by raising the minimum
load current from 0μA (+125°C) to 100μA (+150°C). For
continuous operation, do not exceed the absolute maxi-
mum junction temperature rating of T
J
= +150°C.
MAX8863
MAX8864
SHDN
OUT
SET
GND
IN
C
OUT
1
μ
C
IN
1μF
BATTERY
OUTPUT
VOLTAGE
R1 20pF
R2
R
L
Figure 2. Adjustable Output Using External Feedback
Resistors
R1
R2
V
V
1
OUT
SET
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX8864S | Low-Dropout, 100mA Linear Regulators(100mA,低壓差線性穩(wěn)壓器,SOT23封裝) |
| MAX8864T | Low-Dropout, 100mA Linear Regulators(100mA,低壓差線性穩(wěn)壓器,SOT23封裝) |
| MAX8865 | Dual, Low-Dropout, 100mA Linear Regulators(雙組,低輸出壓降,100mA線性穩(wěn)壓器) |
| MAX8866 | Dual, Low-Dropout, 100mA Linear Regulators(雙組,低輸出壓降,100mA線性穩(wěn)壓器) |
| MAX8875EUK30-T | 150mA, Low-Dropout Linear Regulator with Power-OK Output |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8864REUK | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8864REUK+ | 制造商:Maxim Integrated Products 功能描述:LDO REG 1.225V TO 6.5V/2.8V 0.12A 5PIN SOT-23 - Rail/Tube |
| MAX8864REUK+T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8864REUK-T | 功能描述:低壓差穩(wěn)壓器 - LDO 120mA 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MAX8864SEUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。