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参数资料
| 型号： | MAX16922ATPB/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/17页 |
| 文件大小： | 0K |
| 描述： | IC DCDC CONV STPDN DL LDO 20TQFN |
| 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： | 60 |
| 应用： | 车载系统 |
| 电源电压： | 3.7 V ~ 28 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 管件 |
MAX16922
2.2MHz, Dual, Step-Down DC-DC
Converters, Dual LDOs, and RESET
Typical Applications Circuit
VBAT
0.1 μ F
220 μ F
4.7 μ F
PV1
EN
OUTS2
LX2
2.2 μ H
V OUT2
V OUT1
PWM
PGND2
10 μ F
PV3
4.7 μ F
OUT3
MAX16922
PV2
BST
4.7 μ F
0.1 μ F
4.7 μ F
V OUT2
GND1
GND3
PV4
LX1
OUTS1
4.7 μ H
V OUT1
10 μ F
4.7 μ F
4.7 μ F
OUT4
GND
GND2
EP
LSUP
RESET
1 μ F
V OUT1
20k Ω
Applications Information
Power-On Sequence
When the EN input is pulled high and PV1 is greater
than 3.7V (typ), the 5V LSUP linear regulator turns on.
Once LSUP exceeds 2.5V, the internal reference and
bias are enabled. When the internal bias has stabilized
OUT1, soft-start is initiated. After completion of soft-start
on OUT1 (2.8ms typ), OUT2 soft-start is initiated. OUT3
soft-start is enabled when PV3 is greater than or equal
to 1.25V (typ), and OUT4 soft-start is enabled when PV4
is greater than or equal to 1.5V (typ).
Care must be taken when driving the EN pin. Digital
input signals deliver a fast edge that is properly detect-
ed by the MAX16922. If driving the EN pin with an ana-
log voltage that has a slew rate of less than 1V/ms or a
voltage-divider from PV1, then the input voltage on PV1
must always be less than 6V when the voltage at EN is
near the turn-off threshold of 1.6V. If this cannot be
guaranteed, then a 1k Ω resistor or 5.6V zener diode
must be placed in parallel with the LSUP output capaci-
tor to prevent possible damage to the device.
Power-Down and Restart Sequence
The MAX16922 can be shut down by thermal shut-
down, enable low (EN), LSUP regulator undervoltage,
Maxim Integrated
or when PV1 falls below 3.0V (typ). When a shutdown
occurs, all outputs discharge through an internal resis-
tor connected between each output and ground. When
enable is high, the die temperature is okay, the LSUP
linear regulator is greater than 2.5V (typ), and OUT1 is
less than 1.25V (typ); a complete soft-start power-on
sequence is reinitiated.
Inductor Selection
The OUT1 step-down converter operates with a 4.7μH
inductor and the OUT2 step-down converter operates
with a 2.2μH inductor. The inductor’s DC current rating
must be high enough to account for peak ripple current
and load transients. The step-down converter’s archi-
tecture has minimal current overshoot during startup
and load transients. In most cases, an inductor capable
of 1.3 times the maximum load current is acceptable.
For optimum performance choose an inductor with DC-
series resistance in the 50m Ω to 150m Ω range. For
higher efficiency at heavy loads (above 400mA) and
minimal load regulation, the inductor resistance should
be kept as small as possible. For light-load applications
(up to 200mA), higher resistance is acceptable with
very little impact on performance.
13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16922ATPC/V+ | 功能描述:直流/直流开关转换器 2.2MHz Dual Step-Dwn DC/DC 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 |
| MAX16922ATPC/V+T | 功能描述:直流/直流开关转换器 2.2MHz Dual Step-Dwn DC/DC 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 |
| MAX16922ATPD/V+ | 功能描述:直流/直流开关转换器 2.2MHz Dual Step-Dwn DC/DC 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 |
| MAX16922ATPD/V+T | 功能描述:直流/直流开关转换器 2.2MHz Dual Step-Dwn DC/DC 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 |
| MAX16922ATPE/V+ | 功能描述:直流/直流开关转换器 2.2MHz Dual Step-Dwn DC/DC 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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