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參數(shù)資料
| 型號： | MAX8862 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, Low-Dropout, Dual Linear Regulator |
| 中文描述： | 低成本、低壓差、雙線性穩(wěn)壓器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 129K |
| 代理商： | MAX8862 |
Referenc e
The MAX8862 provides a precision 1.25V reference at
REF2. Bypass REF2 with a 0.1μF capacitor to ground.
Larger bypassing capacitors will further reduce the
secondary regulator’s wideband noise.
S hutdown
The MAX8862’s regulators have individual shutdown
controls. A logic low on either
SHDN1
or
SHDN2
turns
off the corresponding internal reference, error com-
parator, and pass transistors’ control logic, reducing
quiescent current to less than 1μA.
Current Limiting
The MAX8862 features a current limit for each regula-
tor. It monitors and controls the pass transistor’s gate
voltage, limiting the output current to 580mA for the
main regulator and 250mA for the secondary regulator.
The current limits apply to all input and output voltage
conditions. The outputs can be shorted to ground for
an indefinite period of time if the package can dissipate
(V
IN1
x I
LIM1
+ V
IN2
x I
LIM2
) without exceeding T
J
=
+150°C (see the Power Dissipation and Operating
Region section).
T hermal Overload Protec tion
Thermal overload protection limits the MAX8862’s total
power dissipation. When the junction temperature
exceeds T
J
= +160°C, the thermal sensor sends a sig-
nal to the shutdown logic, turning off the pass transis-
tors and allowing the device to cool down. The thermal
sensor turns the pass transistors on again after the IC’s
junction temperature decreases by 20°C. If the thermal
overload condition persists, OUT1 and OUT2 pulse on
and off.
Thermal overload protection is designed to protect the
MAX8862 during fault conditions. For continuous oper-
ation, the absolute maximum junction temperature rat-
ing of T
J
= +150°C should not be exceeded.
Reverse-Battery Protec tion
This feature protects the MAX8862 against polarity
reversal at the supply inputs. The inputs can handle
negative voltages up to -12V without suffering any ill
effects. When the input polarity is reversed, the output
will be at the same potential as ground, and no current
will flow from the output back to the input. This feature
protects both the device and the supply-voltage
source. The reverse currents that flow back to the input
are due to R
PWROK1
, R
SHDN1
, and R
SHDN2
. These
currents are approximately: I
REV1
=
|
V
IN1
|
/ (R
SHDN1
+
R
PWROK1
) and I
REV2
=
|
V
IN2
|
/ R
SHDN2
. When operat-
ing the MAX8862 in continuous mode (V
SHDN1
= V
IN1
and V
SHDN2
= V
IN2
) place a resistor (>20k
) between
shutdown and supply inputs to limit the current flow in
case the battery is reversed.
M
Low-Cost, Low-Dropout, Dual Linear Regulator
_______________________________________________________________________________________
9
MAX8862
R2
R1
OUTPUT
OUT_
SET_
GND
Figure 2. Adjustable Output Voltage
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8862LESE | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 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 |
| MAX8862LESE+ | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 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 |
| MAX8862LESE+T | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 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 |
| MAX8862LESE-T | 功能描述:低壓差穩(wěn)壓器 - LDO Dual 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 |
| MAX8862RCSE | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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