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参数资料
| 型号： | MAX5024TASA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 8/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V/ADJ .15A 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 3.3V，2.5 V ~ 11 V |
| 输入电压： | 6.5 V ~ 65 V |
| 电压 - 压降（标准）： | 0.9V @ 150mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
65V, Low-Quiescent-Current, High-Voltage Linear
Regulators with μP Reset and Watchdog Timer
BATT
V IN
EN
BATT
V OUT WHEN WATCHDOG IS HELD
WDI OV
HIGH AND EN = HIGH
RESET OV
V OUT OV
POR
NORMAL OPERATION
WDI HELD HIGH
BATT
V IN
EN
BATT
V OUT WHEN WATCHDOG IS HELD
LOW AND EN = HIGH
WDI OV
RESET OV
V OUT OV
POR
Figure 2. Watchdog Operation Timing Diagram
NORMAL OPERATION
WDI HELD LOW
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
8
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