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參數(shù)資料
| 型號： | MAX8863 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Pin-Compatible, Low-Dropout, 120 mA Linear Regulator |
| 中文描述： | 低壓差、120mA線性穩(wěn)壓器 |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 86K |
| 代理商： | MAX8863 |
MAX8863
http://onsemi.com
4
DETAILED DESCRIPTION
The MAX8863 is a fixed output, low–dropout,
low–quiescent current linear regulator designed specifically
for portable, battery–operated equipment such as cellular
phones, cordless phones, and modems. A 1.20 V reference,
error amplifier, MOSFET driver, P–channel pass transistor,
comparator, and internal feedback voltage divider comprise
the MAX8863 (see Figure 3).
The bandgap reference is connected to the error
amplifier’s inverting input. The error amplifier then
compares the reference with the selected feedback voltage
and amplifies the difference. The MOSFET driver, reading
the error signal, applies the correct drive to the P–channel
pass transistor. If the feedback voltage is lower than the
reference, the pass–transistor is pulled lower to allow more
current through, and to increase the output voltage.
Conversely, if the feedback voltage is higher than the
reference, the pass–transistor is pulled up, which allows less
current through to the output.
Turn On Response
The turn on response is defined as two separate response
categories,
Wake Up Time (t
WK
)
and
Settling Time (t
S
)
.
The MAX8863 has a fast Wake Up Time (10
μ
sec typical)
when released from shutdown. See Figure 2 for the
Wake
Up Time
designated as
t
WK
. The
Wake Up Time
is defined
as the time it takes for the output to rise to 2.0% of the V
OUT
value after being released from shutdown.
V
OUT
SHDN
V
IL
t
WK
98%
2%
t
S
V
IH
Figure 2. Wake Up Response Time
The total turn on response is defined as the
Settling Time
(t
S
)
, see Figure 2.
Settling Time
(inclusive with t
WK
) is
defined as the condition when the output is within 2.0% of
its fully enabled value (140
μ
sec typical) when released
from shutdown. The settling time of the output voltage is
dependent on load conditions and output capacitance on
V
OUT
(RC response).
Internal P–Channel Pass Transistor
Featuring a 1.1
P–channel MOSFET pass transistor, the
MAX8863 offers longer battery life than similar designs
using PNP pass transistors, which waste current in dropout
when the pass transistor saturates. PNP–based regulators
also use high base–drive currents under large loads. The
P–channel MOSFET, however, does not require a base drive
current, which reduces quiescent current. The MAX8863
uses only 50
μ
A of quiescent current.
SHDN
–
+
MOS DRIVER
WITH I
LIMIT
THERMAL
SENSOR
1.2 V
REF
SHUTDOWN
LOGIC
IN
GND
GND
OUT
P
N
(MAX8863 Only)
Figure 3. Functional Block Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX8863QEUK-T | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MAX8863REUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX8863REUK+ | 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 |
| MAX8863REUK+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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(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 |
| MAX8863REUK-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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(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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