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| 型号： | MAX5089ATE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 16TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 20 V |
| 输入电压： | 4.5 V ~ 23 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 312kHz ~ 2.1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 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 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TQFN-EP（5x5） |
2.2MHz, 2A Buck Converters with an
Integrated High-Side Switch
125 × 10 8
At high input-to-output differential, and high switching
frequency, the on-time drops to the order of 100ns.
Even though the MAX5088/MAX5089 can control the
on-time as low as 100ns, the internal current-limit circuit
may not detect the overcurrent within this time. In that
case, the output current during the fault may exceed the
current limit specified in the Electrical Characteristics
table. The MAX5088/MAX5089 may still be protected
against the output short-circuit fault through the
overtemperature shutdown. However, the output cur-
rent may be as high as 5.5A. If the minimum on-time for
a given frequency and duty cycle is less than 200ns,
choose the inductor with a saturation current of greater
than 5.5A.
Power-on Reset ( RESET )
(MAX5088 Only)
RESET is an active-low open-drain output that pulls low
when V OUT falls below 92.5% of its nominal set point.
RESET goes high impedance when V OUT rises above
92.5% of its nominal set point, the soft-start period is
complete, and the 200ms (typ) timeout period has
elapsed. Connect a pullup resistor from RESET to a
logic voltage or to V L . The internal open-drain MOSFET
at RESET can sink 3mA while providing a TTL-compati-
ble logic-low signal. Connect RESET to SGND or leave
unconnected when not used.
Power-Good (PGOOD)
(MAX5089 Only)
PGOOD is an open-drain, active-high output that pulls
low when V OUT is below 92.5% of its nominal set point
and goes high impedance when V OUT goes above
92.5% its nominal set point. Connect a pullup resistor
from PGOOD to a logic voltage or to V L . PGOOD can sink
up to 3mA while still providing a TTL-compatible logic-low
output. Pulling EN low forces PGOOD low. Connect
PGOOD to SGND or leave unconnected when not used.
Thermal-Overload Protection
During a continuous output short-circuit or overload
condition, the power dissipation in the MAX5088/
MAX5089 can exceed its limit. The MAX5088/MAX5089
provide an internal thermal shutdown to turn off the
device when the die temperature reaches +170°C. A
thermal sensor monitors the die temperature and turns
the device on again when the die temperature reduces
by +25°C. During thermal shutdown, the internal power
MOSFET shuts off, DL pulls to SGND, V L shuts down,
RESET (MAX5088)/PGOOD (MAX5089) pulls low, and
soft-start resets.
Applications Information
Setting the Switching Frequency
The controller generates the switching frequency (f SW )
through the internal oscillator or the signal at SYNC
(f SYNC ), when driven by an external oscillator. The
switching frequency is equal to f SW or f SYNC .
A resistor, R OSC , from OSC to SGND sets the internal
oscillator. The relationship between f SW and R OSC is:
R OSC =
f SW
where f SW is in Hertz, and R OSC is in ohms. For exam-
ple, a 1.25MHz switching frequency is set with R OSC =
10k ? . Higher frequencies allow designs with lower
inductor values and less output capacitance.
Consequently, peak currents and I 2 R losses are lower
at higher switching frequencies, but core losses, gate-
charge currents, and switching losses increase.
Rising clock edges on SYNC are interpreted as a syn-
chronization input. If the SYNC signal is lost, the internal
oscillator takes control of the switching rate, returning
the switching frequency to that set by R OSC . This main-
tains output regulation even with intermittent SYNC sig-
nals. When using an external synchronization signal, set
R OSC so that (0.2 x f SYNC ) ≤ f SW ≤ (1.2 x f SYNC ).
Buck Converter
Use the internal n-channel power MOSFET as a high-
side switch to configure the MAX5088/MAX5089 as a
buck converter. In this configuration, SOURCE is con-
nected to the inductor, DRAIN is connected to the
input, and BST/VDD connects to the cathode of the
bootstrap diode and capacitor. Figures 5 and 6 show
the typical application circuits for MAX5088/MAX5089,
respectively, in a buck configuration.
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相关代理商/技术参数 |
参数描述 |
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| MAX5089ATE+ | 功能描述:直流/直流开关转换器 2.2MHz 2A Buck Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5089ATE+T | 功能描述:直流/直流开关转换器 2.2MHz 2A Buck Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX5089EVKIT | 功能描述:直流/直流开关转换器 MAX5089 Evaluation Kit RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX508ACPP | 功能描述:数模转换器- DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
| MAX508ACPP+ | 功能描述:数模转换器- DAC 12-Bit Precision DAC RoHS:否 制造商:Texas Instruments 转换器数量:1 DAC 输出端数量:1 转换速率:2 MSPs 分辨率:16 bit 接口类型:QSPI, SPI, Serial (3-Wire, Microwire) 稳定时间:1 us 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-14 封装:Tube |
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