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参数资料
| 型号： | MAX15011ATJ+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 15/24页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V/ADJ .3A 32TQFN |
| 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： | 5V，1.8 V ~ 11 V |
| 输入电压： | 5 V ~ 40 V |
| 电压 - 压降（标准）： | 0.8V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小） |
| 电流 - 限制（最小）： | 330mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
Automotive 300mA LDO Regulators with
Switched Output and Overvoltage Protector
Table 1. EN_LDO/ H O L D Truth/State Table
OPERATION STATE
EN_LDO
HOLD
OUT_LDO
COMMENT
EN_LDO is pulled to SGND through an internal pulldown. HOLD
Initial State
Low
Don’t care
OFF
is unconnected and is internally pulled up to OUT_LDO. The
regulator is disabled.
Turn-On State
Hold Setup State
Hold State
Off State
High
High
Low
Low
Don’t care
Low
Low
High or
unconnected
ON
ON
ON
OFF
EN_LDO is externally driven high turning regulator on. HOLD is
pulled up to OUT_LDO.
HOLD is externally pulled low while EN_LDO remains high
(latches EN_LDO state).
EN_LDO is driven low or left unconnected. HOLD remains
externally pulled low keeping the regulator on.
HOLD is driven high or left unconnected while EN_LDO is low.
The regulator is turned off and EN_LDO/ HOLD logic returns to the
initial state.
Applications Information
Load Dump
Most automotive applications run off a multicell 12V
V IN
IN
OUT_LDO
lead-acid battery with a nominal voltage that swings
between 9V and 16V, depending on load current,
charging status, temperature, and battery age, etc. The
battery voltage is distributed throughout the automobile
and is locally regulated down to voltages required by
the different system modules. Load dump occurs when
the alternator is charging the battery and the battery
becomes disconnected. Power in the alternator (behav-
ing now essentially as an inductor) flows into the dis-
tributed power system and elevates the voltage seen at
each module. The voltage spikes have rise times typi-
cally greater than 5ms and decay within several hun-
MAX15009
MAX15011
FB_LDO
SGND
R1
R2
dred milliseconds but can extend out to 1s or more
depending on the characteristics of the charging sys-
tem. These transients are capable of destroying semi-
conductors on the first fault event.
The MAX15009/MAX15011 feature load-dump transient
protection up to +45V.
Setting the Output Voltage
The MAX15009/MAX15011 feature dual-mode opera-
tion: these devices operate in either a preset voltage
mode or an adjustable mode. In preset voltage mode,
internal feedback resistors set the linear regulator out-
put voltage (V OUT_LDO ) to 5V. To select the preset 5V
output voltage, connect FB_LDO to SGND.
To select an adjustable output voltage between 1.8V
and 11V, use two external resistors connected as a
voltage-divider to FB_LDO (Figure 3). Set the output
voltage using the following equation:
Figure 3. Setting the LDO Output Voltage
V OUT_LDO = V FB_LDO x (R 1 + R 2 ) / R 2
where V FB_LDO = 1.235V and R 2 ≤ 50k Ω .
Setting the RESET Timeout Period
The reset timeout period is adjustable to accommodate
a variety of applications. Set the reset timeout period by
connecting a capacitor, C RESET , between CT and
SGND. Use the following formula to select the reset
timeout period, t RESET :
t RESET = C RESET x V CT_TH / I CT
where t RESET is in seconds and C RESET is in μF.
V CT_TH is the CT ramp threshold in volts and I CT is the
CT ramp current in μA, as described in the Electrical
Characteristics table.
______________________________________________________________________________________
15
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