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参数资料
| 型号： | MAX16975BAEE/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 5V/ADJ 16QSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1 V ~ 10 V |
| 输入电压： | 3.5 V ~ 28 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 220kHz ~ 1MHz |
| 电流 - 输出： | 1.2A |
| 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-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 16-QSOP |
MAX16975
28V, 1.2A Automotive Step-Down Converter
with Low Operating Current
V OUT
Applications Information
MAX16975
RESETI
R FB1
R FB2
Output Voltage/Reset Threshold
Resistive Divider Network
Although the device’s output voltage and reset threshold
can be set individually, Figure 1 shows a combined resis-
tive divider network to set the desired output voltage and
FB
R FB3
the reset threshold using three resistors. Use the follow-
ing formula to determine the R FB3 of the resistive divider
network:
R FB3 =
R TOTAL × V REF
V OUT
Figure 1. Output Voltage/Reset Threshold Resistive Divider
Network
Overvoltage Protection
The device includes overvoltage protection circuitry that
protects the device when there is an overvoltage condi-
tion at the output. If the output voltage increases by more
than 12% of its set voltage, the device stops switching.
The device resumes regulation once the overvoltage
where V REF = 1V, R TOTAL = selected total resistance of
R FB1 , R FB2 , and R FB3 in ohms, and V OUT is the desired
output voltage in volts.
Use the following formula to calculate the value of R FB2
of the resistive divider network:
Overload Protection
R FB2
condition is removed.
=
The overload protection circuitry is activated when the
R TOTAL × V REF_RES
V RES
? R FB3
device is in current limit and V OUT is below the reset
threshold. Under these conditions, the device enters
a soft-start mode. When the overcurrent condition is
removed before the soft-start mode is over, the device
regulates the output voltage to the set value. Otherwise,
the soft-start cycle repeats until the overcurrent condition
is removed.
Skip Mode
During light-load operation, I INDUCTOR P 200mA, the
device enters skip-mode operation. Skip mode turns off
the internal switch and allows the output to drop below
regulation voltage before the switch is turned on again.
The lower the load current, the longer it takes for the
regulator to initiate a new cycle effectively increasing
light-load efficiency. During skip mode, the device qui-
escent current drops to as low as 45 F A.
Overtemperature Protection
Thermal-overload protection limits the total power dis-
sipation in the device. When the junction temperature
exceeds +175 N C (typ), an internal thermal sensor shuts
down the step-down controller, allowing the device to
cool. The thermal sensor turns on the device again after
the junction temperature cools by +15 N C.
Maxim Integrated
where V REF_RES is 1.25V (see the Electrical Characteristics
table) and V RES is the desired reset threshold in volts.
The precision of the reset threshold function is depen-
dent on the tolerance of the resistors used for the divider.
BST Capacitor Selection
for Dropout Operation
The device includes an internal boost capacitor refresh
algorithm for dropout operation. This is required to ensure
proper boost capacitor voltage that delivers power to the
gate-drive circuitry. When the HSFET is on consecutively
for 3.65 clock cycles, the internal counter detects this
and turns off the HSFET for 0.35 clock cycles. This is of
particular concern when V IN is falling and approaching
V OUT at the minimum switching frequency (220kHz).
The worst-case condition for boost capacitor refresh time
is with no load on the output. For the boost capacitor
to recharge completely, the LX node must be pulled to
ground. If there is no current through the inductor then
the LX node does not go to ground. To solve this issue,
an internal load of about 100mA turns on at the sixth
clock cycle, which is determined by a separate counter.
In the worst-case condition with no load, the LX node
does not go below ground during the first detect of the
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16976AEE/V+ | 功能描述:直流/直流开关转换器 28V 600Ma 2MHz Step-Down 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 |
| MAX16976AEE/V+T | 功能描述:直流/直流开关转换器 28V 600Ma 2MHz Step-Down 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 |
| MAX16977EVKIT# | 功能描述:直流/直流开关转换器 36V 2A 2.2MHz Step-Down Converter with Low Operating Current 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 |
| MAX16977RATE/V+ | 功能描述:直流/直流开关转换器 36V 2A 2.2MHz Step-Down 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 |
| MAX16977RATE/V+T | 功能描述:直流/直流开关转换器 36V 2A 2.2MHz Step-Down 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 |
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