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参数资料
| 型号： | MAX5081ATE+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1A 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： | 1.23 V ~ 32 V |
| 输入电压： | 7.5 V ~ 40 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 250kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 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） |
1A, 40V, MAXPower Step-Down
DC-DC Converters
ON/OFF
IN
LDO
>1.23V ON
REG
EN
1.23V
1.23V
<1.11V OFF
MAX5081
SGND
I SS
REF
V REF
THERMAL
SHDN
EN
OVERL
OVERLOAD
MANAGEMENT
ILIM
CLK
REGOK
SS
1.23V
E/A
SSA
ILIM
REF_ILIM
IN
FB
COMP
V REF
PFM
REF_PFM
HIGH-SIDE
CURRENT
SENSE
BST
IN
CPWM
LOGIC
LX
SYNC
EN
OSC
RAMP
DVREG
0.3V
CLK
ILIM
BOOTSTRAP
CONTROL
PCLK
SCLK
PGND
Figure 2. MAX5081 Simplified Block Diagram
Soft-Start and Reference (SS)
SS is the 1.23V reference bypass connection for the
MAX5080/MAX5081 and also controls the soft-start
period. At startup, after V IN is applied and the internal
and external UVLO thresholds are reached, the device
enters soft-start. During soft-start, 15μA is sourced into
the capacitor (C SS ) connected from SS to SGND caus-
ing the reference voltage to ramp up slowly. When V SS
reaches 1.23V the output becomes fully active. Set the
soft-start time (t SS ) using following equation:
Internal Charge Pump (MAX5080)
The MAX5080 features an internal charge pump to
enhance the turn-on of the internal MOSFET, allowing
for operation with input voltages down to 4.5V. Connect
a flying capacitor (C F ) between C+ and C-, a boost
diode from C+ to BST, as well as a bootstrap capacitor
(C BST ) between BST and LX to provide the gate drive
voltage for the high-side n-channel DMOS switch.
During the on-time, the flying capacitor is charged to
V DVREG . During the off-time, the positive terminal of the
t SS =
1.23 V × C SS
15 μ A
flying capacitor (C+) is pumped to two times V DVREG
and charge is dumped onto C BST to provide twice the
regulator voltage across the high-side DMOS driver.
where t SS is in seconds and C SS is in Farads.
Use a ceramic capacitor of at least 0.1μF for C BST and
C F located as close to the device as possible.
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX5081ATE+ | 功能描述:直流/直流开关转换器 1A 40V MAXPower 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 |
| MAX5081ATE+T | 功能描述:直流/直流开关转换器 1A 40V MAXPower 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 |
| MAX5081ATE-T | 功能描述:直流/直流开关转换器 1A 40V MAXPower 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 |
| MAX5082 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1.5A, 40V, MAXPower Step-Down DC-DC Converters |
| MAX5082ATE | 功能描述:直流/直流开关转换器 1A 40V MAXPower 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 |
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