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參數(shù)資料
| 型號(hào)： | 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)： | 11/12頁 |
| 文件大?。?/td> | 129K |
| 代理商： | MAX8862 |
Noise
The MAX8862’s OUT1 exhibits about 2.5mVp-p, and
OUT2 exhibits 1mVp-p of noise under full-load condi-
tions. When using the MAX8862 for applications that
include analog-to-digital converters (ADCs) with resolu-
tions greater than 12 bits, consider the ADC’s power-
supply-rejection specifications.
PS RR and Operation
from S ourc es Other than Batteries
The MAX8862 is designed to achieve low dropout volt-
ages and low quiescent currents in battery-powered
systems. However, to gain these benefits; the device
must trade away power-supply noise rejection, as well
as swift response to supply variations and load tran-
sients. For a 1mA load current, power-supply rejection
typically changes from 58dB to 43dB when the input
frequency is changed from 1Hz to 10kHz. At higher fre-
quencies, the circuit depends primarily on the output
capacitor’s characteristics, and the PSRR increases
(Figure 5).
When operating from sources other than batteries, sup-
ply-noise rejection and transient response can be
improved by increasing the value of the input and out-
put capacitors and employing passive filtering tech-
niques. Do not use power supplies with ripple voltages
exceeding 200mV at 100kHz.
Overshoot and T ransient Considerations
The Typical Operating Characteristics section shows
power-up, line, and load-transient response graphs.
Typical transients for step changes in the load current
from 0mA to 300mA are 100mVp-p. During recovery
from shutdown, overshoot is minimized by the 1μF
input, and output capacitors (3.3μF for OUT1, and
2.2μF for OUT2).
Input-Output (Dropout) V oltage
A regulator’s minimum input-to-output voltage differen-
tial (or dropout voltage) determines the lowest usable
supply voltage. In battery-powered systems, this deter-
mines the useful end-of-life battery voltage. Since
P-channel MOSFETs are used as pass transistors, the
dropout voltage is the product of the R
DS(ON)
and the
load current (see the Electrical Characteristics).
M
Low-Cost, Low-Dropout, Dual Linear Regulator
______________________________________________________________________________________
11
70
20
0.01
1
100
30
M
FREQUENCY (kHz)
P
40
50
60
0.1
10
OUT1
V
IN1
= 1V
p-p
C
IN1
= 1
μ
F
C
OUT1
= 3.3μF
A: I
OUT1
= 1mA
B: I
OUT1
= 10mA
C: I
OUT1
= 100mA
A
B
C
70
20
1
100
30
FREQUENCY (kHz)
P
40
50
60
0.1
10
65
55
45
35
25
1000
M
A: C
OUT1
= 100
μ
F
B: C
OUT1
= 10
μ
F
A
B
OUT1
V
IN1
= 1V
p-p
C
IN1
= 1
μ
F
I
OUT1
= 100mA
Figure 5a. Power-Supply Rejection Ratio vs. Ripple Frequency
for Light and Heavy Loads
Figure 5b. Power-Supply Rejection Ratio vs. Ripple Frequency
for Various Output Capacitors
___________________Chip Information
TRANSISTOR COUNT: 457
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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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