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| 型号： | MAX5092BATE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG DL BUCK/LINEAR 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 拓扑： | 降压（降压）（1），线性（LDO）（1） |
| 功能： | 车载 |
| 输出数： | 2 |
| 频率 - 开关： | 1MHz |
| 电压/电流 - 输出 1： | 7V/可调至11V，250mA |
| 电压/电流 - 输出 2： | 5V/1.5 V ~ 9 V，250mA |
| 带 LED 驱动器： | 无 |
| 带监控器： | 无 |
| 带序列发生器： | 无 |
| 电源电压： | 3.5 V ~ 72 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
| 包装： | 管件 |
4V to 72V Input LDOs with Boost Preregulator
Detailed Description
The MAX5092A/MAX5092B/MAX5093A/MAX5093B
include a step-up, switch-mode DC-DC converter and a
linear regulator to provide step-up/-down voltage con-
version over a wide range of input voltages. This combi-
nation of an LDO and a boost converter offers the
advantage of using a single off-the-shelf inductor in
place of the multiple-winding custom magnetics needed
in typical SEPIC or transformer-based flyback topolo-
gies. The boost preregulator is completely turned off
during normal automotive operation (V IN = 14V),
reduces quiescent current to 65μA (typ), and makes the
devices suitable for always-on power supplies.
The devices have an internal UVLO threshold of 3.8V
(max, V IN rising) that must be exceeded before the
device is enabled. When V IN is above V UVLO , the inter-
nal boost converter starts switching and regulates
V BSOUT to the programmed boost output voltage. The
low quiescent-current LDO steps down V BSOUT to the
programmed LDO output voltage. The LDO output is
preset to 3.3V (MAX5092A/MAX5093A) or 5V
(MAX5092B/MAX5093B). Both output voltages can be
adjusted by using external resistor-dividers.
If (V BSOUT - V OUT ) rises above 2.5V (typ), the boost con-
verter is disabled, forcing V BSOUT to follow V IN . If
V BSOUT - V OUT falls below 2V (typ), the boost converter
starts switching and regulates V BSOUT to the pro-
grammed voltage. The boost converter regulates
V BSOUT for V IN down to 3.5V, providing uninterrupted
operation during low cold-crank voltages even if the pro-
grammed LDO output voltage is greater than V IN (but
less than 9V). The boost converter turn-on response time
is less than 10μs, making cold-crank input glitches trans-
parent to the system even at full load.
The boost-converter output is followed by a high PSRR,
low-quiescent-current LDO. The LDO rejects the
switching noise present at BSOUT and provides a
clean, regulated output voltage. The linear regulator
uses an internal p-channel MOSFET pass element.
Additional features include a power-on-reset function
with an externally adjustable timeout, an enable (EN)
input, and a hold ( HOLD ) regulator control input.
Boost Converter
The switch-mode converter uses a minimum off-time,
maximum on-time pulse frequency modulation (PFM)
control scheme. The internal MOSFET turns on whenev-
er V BSOUT falls below the regulation point determined
by V BSFB (see the Setting the Boost Output Voltage
(V BSOUT ) section). The MOSFET turns off when the
inductor current reaches the peak current limit (2.5A
typ) or after 2.25μs maximum on-time, whichever
occurs first. The MOSFET is held off for at least 1μs
after the turn-on phase. A new switching cycle initiates
once V BSOUT falls below the threshold. In this control
scheme, switching frequency and output ripple are
functions of load current and input voltage. No frequen-
cy compensation is needed in the PFM control scheme.
The output of the boost converter is preset to 7V and is
adjustable by using external resistors. See the Setting
the Boost Output Voltage V BSOUT section.
If V BSOUT is programmed greater than (V OUT +
V BST_DIS ), larger ripple is observed on BSOUT. The rea-
son is as V BSOUT rises above V OUT + V BST_DIS , the
boost converter is disabled, causing V BSOUT to fall. As
V BSOUT falls to V OUT + V BST_EN , the boost converter
turns back on, and V BSOUT rises. For the lowest V BSOUT
ripple, program V BSOUT within the boost disable thresh-
old. See the Typical Operating Characteristics for the
Switching Waveforms.
Due to the integrated blocking diode in the MAX5092_,
V BSOUT is limited to 11V. Use the MAX5093_ for higher
boost output voltages (or to reduce the power dissipa-
tion in to the package). The MAX5093_ requires an
external diode for the boost converter. Select the exter-
nal diode according to the Schottky Diode Selection
(MAX5093_) section.
Linear Regulator
The MAX5092_/MAX5093_ contain an internal p-chan-
nel MOSFET used as the pass transistor for the LDO.
The output of the boost regulator is connected to the
source of the p-MOSFET. The LDO starts up 200μs
after the boost regulator starts up. The LDO supplies
up to 250mA with a typical dropout voltage of 0.9V. The
maximum LDO output current is determined by the
package power-dissipation limit as well as the internal
current limit. The LDO is designed to be a low-quies-
cent-current type. During normal operation when the
battery voltage is > 9V, the MAX5092_/MAX5093_ con-
sume only 75μA (max) at +85°C and 100μA load.
The output voltage of the LDO is set using the SET
input. Connect SET to SGND to use the factory-preset
output voltage. Connect SET to the center of an exter-
nal resistor-divider connected from OUT to SGND to
program a different output voltage. See the Setting the
LDO Output Voltage (V OUT ) section.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5092BATE+ | 功能描述:低压差稳压器 - LDO 4V to 72V LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX5092BATE+T | 功能描述:低压差稳压器 - LDO 4V to 72V LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX5092EVKIT+ | 功能描述:电源管理IC开发工具 MAX5092A-B/93A-B Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX5093 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:4V to 72V Input LDOs with Boost Preregulator |
| MAX5093AATE+ | 功能描述:低压差稳压器 - LDO 4V to 72V LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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