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參數(shù)資料
| 型號： | MAX5023 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 65V, Low-Quiescent-Current, High-Voltage Linear Regulators with レP Reset and Watchdog Timer |
| 中文描述： | 65V、低靜態(tài)電流、高壓線性穩(wěn)壓器，帶有微處理器復位及看門狗定時器 |
| 文件頁數(shù)： | 8/13頁 |
| 文件大?。?/td> | 371K |
| 代理商： | MAX5023 |
M
Reset Output
The reset supervisor circuit is fully integrated in the
MAX5023/MAX5024 and uses the same reference volt-
age as the regulator.
RESET
asserts during power-
up/down and brownout conditions.
RESET
goes low if
V
OUT
drops below the preset output voltage threshold,
and remains low for 200ms (reset timeout period, t
RP
)
after V
OUT
rises above the reset voltage threshold. For
the MAX5023 only,
RESET
also asserts when WDI does
not transition for 1.6s (watchdog timeout period, t
WD
).
Two supply tolerance reset thresholds, -7.5% and
-12.5%, are available for each device type.
Watchdog Timer (MAX5023 only)
A watchdog timer asserts
RESET
if the watchdog input
(WDI) is not toggled for 1.6s (watchdog timeout period,
t
WD
).
RESET
remains low for 200ms (reset timeout peri-
od, t
RP
). If the watchdog is not updated for lengthy
periods of time, the reset output appears as a pulse
train, asserted for 200ms, deasserted for 1.6s, until WDI
is toggled again. Once
RESET
asserts, it stays low for
the entire reset timeout period ignoring any WDI transi-
tions during the reset timeout period.
Figure 2 shows the Watchdog Operation Timing
Diagram. To prevent the watchdog from asserting
RESET
, toggle WDI with a valid rising or falling edge
prior to t
WD
(min) = 1.12s. The watchdog counter clears
when WDI toggles prior to t
WD
or when
RESET
asserts.
The watchdog resumes counting after
RESET
deasserts.
Enable and Hold Inputs
The MAX5023/MAX5024 support two logic inputs, EN
(active high) and
HOLD
(active low), making these
devices
“
automotive friendly.
”
For example, the ignition
drives EN high, the regulator turns on and remains on
even if EN goes low, as long as
HOLD
is forced low
and stays low after initial regulator power-up. This fea-
ture makes it possible to implement a self-holding
circuit without external components. Release
HOLD
(an
internal current source connects HOLD to OUT) to turn
the regulator off.
Force EN low and
HOLD
high to place the MAX5023/
MAX5024 into shutdown mode. Shutdown mode draws
less than 16μA of supply current. Table 1 shows the state
of the regulator output with respect to the voltage level at
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
8
_______________________________________________________________________________________
V
OUT
WHEN WATCHDOG IS HELD
HIGH AND EN = HIGH
V
WHEN WATCHDOG IS HELD
LOW AND EN = HIGH
BATT
BATT
BATT
BATT
POR
NORMAL OPERATION
WDI HELD HIGH
POR
NORMAL OPERATION
WDI HELD LOW
EN
WDI
RESET
V
OUT
OV
OV
OV
OV
OV
OV
V
IN
EN
WDI
RESET
V
OUT
V
IN
Figure 2. Watchdog Operation Timing Diagram
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX5023_05 | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:65V, Low-Quiescent-Current, High-Voltage Linear Regulators with μP Reset and Watchdog Timer |
| MAX5023_ASA | 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:65V, Low-Quiescent-Current, High-Voltage Linear Regulators with レP Reset and Watchdog Timer |
| MAX5023LASA | 功能描述:線性穩(wěn)壓器 - 標準 65V Low-Q w/uP Reset & Watchdog Timer RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| MAX5023LASA+ | 功能描述:線性穩(wěn)壓器 - 標準 65V Low-Q w/uP Reset & Watchdog Timer RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
| MAX5023LASA+T | 功能描述:線性穩(wěn)壓器 - 標準 65V Low-Q w/uP Reset & Watchdog Timer RoHS:否 制造商:STMicroelectronics 輸出類型: 極性: 輸出電壓:1.8 V 輸出電流:150 mA 負載調(diào)節(jié): 最大輸入電壓:5.5 V 線路調(diào)整率: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SOT-323-5L |
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