- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383422 > MAX4834 (Maxim Integrated Products, Inc.) 3.3/5-V RS-485 Transceiver 8-SOIC -40 to 85 PDF資料下載
參數(shù)資料
| 型號(hào)： | MAX4834 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 3.3/5-V RS-485 Transceiver 8-SOIC -40 to 85 |
| 中文描述： | 250mA LDO線性穩(wěn)壓器，帶有限流開關(guān) |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 350K |
| 代理商： | MAX4834 |
Detailed Description
The MAX4834/MAX4835 are ultra-low quiescent current,
low-dropout linear regulators with an integrated current
limiter. These devices guarantee up to 250mA drive
capabilities and regulate the preset output voltage.
The MAX4834 has a flag output that asserts low when
the load current exceeds the current limit for more than
the blanking time (t
BLANK
). The MAX4835 has a reset
output that asserts low when the regulator output volt-
age is below the reset threshold voltage (V
RESET
).
V
RESET
is 87.5% of the nominal output voltage. Figure 1
shows the simplified functional diagram and Figure 2
shows the typical application circuits.
FLAG
Output (MAX4834)
The open-drain
FLAG
output goes low and the LDO’s
pass transistor is latched off when the current in the
pass transistor is at its output current limit for more than
the blanking time (t
BLANK
). Cycling IN or
SHDN
(high to
low to high) brings the device out of its latched-off state
and back into normal operation.
RESET
Output (MAX4835)
The
RESET
output asserts when one of the following
conditions occurs:
The input voltage (V
IN
) is below the input undervolt-
age lockout threshold (V
UVLO
).
The output voltage (V
OUT
) is below the reset thresh-
old (V
RESET
).
SHDN
is pulled low.
The device is in thermal shutdown.
When V
OUT
> V
IN.
RESET
remains low for the reset timeout period (t
RESET
)
after reset conditions are terminated. There are four
RESET
timeout periods available as shown in the
Electrical Characteristics
table.
RESET
is available in a
push-pull configuration as shown in the
Selector Guide
.
Shutdown
Pull
SHDN
low to shut down the LDO and reduce the
quiescent current consumption of the device from 90μA
to 0.1μA. In shutdown mode, the pass transistor, con-
trol circuit, and reference circuit are turned off. Connect
SHDN
to a supply voltage greater than V
IH
to turn on
the LDO.
M
250mA LDO Linear Regulators with
Current-Limiting Switch
_______________________________________________________________________________________
7
Pin Description
PIN
SOT23
TDFN
NAME
FUNCTION
1
1
IN
Regulator Power Input. Bypass IN to GND with a 0.1μF ceramic capacitor. Install the bypass
capacitor as close to the device as possible.
2
2
GND
Ground
3
3
SHDN
Active-Low Shutdown Input. Drive
SHDN
low to shutdown the regulator. Drive
SHDN
high or
connect to IN for normal operation.
FLAG
(MAX4834)
Overcurrent Flag. Open-drain
FLAG
goes low when the device senses sustained current
exceeding the current-limit threshold for a duration longer than the blanking time.
FLAG
is high
when
SHDN
is low or the device is in thermal shutdown.
4
4
RESET
(MAX4835)
Active-Low Reset Output. Push-pull
RESET
goes low when the voltage at OUT is below the reset
threshold or when the voltage at OUT is greater than IN.
RESET
is low when
SHDN
is low or the
device is in thermal shutdown. After the reset condition terminates,
RESET
remains low for the
duration of the reset timeout period.
5
5
SS
Soft-Start Control. Connect a capacitor, C
SS
, from SS to GND to program the output rise time at
startup. No capacitor from SS to GND gives 1ms output rise time at startup. See the soft-start
response time plots in the
Typical Operating Characteristics
.
6
6
OUT
Regulator Output. Bypass OUT to GND with a 3.3μF or larger ceramic capacitor. The capacitor’s
ESR should be less than 0.2
for stable operation.
—
EP
EP
Exposed Pad. EP is internally connected to GND. Externally connect EP to GND to provide a low
thermal resistance path from the IC junction to the PC board.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4835 | 3.3/5-V RS-485 Transceiver 8-SOIC -40 to 85 |
| MAX4834ETT25C-T | CONECTOR |
| MAX4834ETT28C-T | 250mA LDO Linear Regulators with Current-Limiting Switch |
| MAX4834ETT30C-T | 250mA LDO Linear Regulators with Current-Limiting Switch |
| MAX4834ETT33C-T | 250mA LDO Linear Regulators with Current-Limiting Switch |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4834ETT18C | 制造商:Maxim Integrated Products 功能描述:250MA LDOS WITH CURRENT-LIMITING SW - Rail/Tube |
| MAX4834ETT18C+T | 功能描述:低壓差穩(wěn)壓器 - LDO 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 |
| MAX4834ETT18C-T | 功能描述:低壓差穩(wěn)壓器 - LDO 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 |
| MAX4834ETT25C | 制造商:Maxim Integrated Products 功能描述:250MA LDOS WITH CURRENT-LIMITING SW - Rail/Tube |
| MAX4834ETT25C+T | 功能描述:低壓差穩(wěn)壓器 - LDO 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。