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| 型号： | MAX1951AESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5.5 V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
1MHz, 2A, 2.6V to 5.5V Input, PWM DC-DC
Step-Down Regulator with Enable
POSITIVE AND NEGATIVE CURRENT LIMITS
V CC
OSC
CLOCK
IN
CURRENT SENSE
PWM
CONTROL
LX
RAMP GEN
SLOPE
COMP
PREBIAS
CLAMP
ERROR
SIGNAL
THERMAL
SHUTDOWN
ZERO-
CROSSING
PGND
DETECTOR
FB
COMP
SOFT-START/
UVLO
BANDGAP
DAC
g m
EN
REF
1.25V
MAX1951A
GND
Figure 1. Functional Diagram
V CC Decoupling
Due to the high switching frequency and tight output
tolerance (1.5%), decouple V CC with a 0.1μF capacitor
connected from V CC to GND, and a 10 ? resistor con-
nected from V CC to IN. Place the capacitor as close as
possible to V CC .
Soft-Start
The MAX1951A employs digital soft-start circuitry to
reduce supply inrush current during startup conditions.
When the device exits undervoltage lockout (UVLO)
shutdown mode, or restarts following a thermal-over-
load event, or EN is driven high, the digital soft-start cir-
cuitry slowly ramps up the voltage to the error-amplifier
noninverting input.
Undervoltage Lockout
If V CC drops below 2.07V, the UVLO circuit inhibits
switching. Once V CC rises above 2.19V, the UVLO
clear and the soft-start sequence activates.
Shutdown Mode
Use the enable input, EN, to turn on or off the MAX1951A.
Connect EN to V CC for normal operation. Connect EN to
GND to place the device in shutdown. Shutdown causes
the internal switches to stop switching and forces LX into
a high-impedance state. In shutdown, the MAX1951A
draws 500μA of supply current. The device initiates a
soft-start sequence when brought out of shutdown.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation
in the device. When the junction temperature exceeds
T J = +165°C, a thermal sensor forces the device into
shutdown, allowing the die to cool. The thermal sensor
turns the device on again after the junction temperature
cools by 9°C, resulting in a pulsed output during continu-
ous overload conditions. Following a thermal-shutdown
condition, the soft-start sequence begins.
Safe Startup into Prebiased Output
The MAX1951A can start up safely even with a prebi-
ased output. A zero crossover detection (ZCD) circuit
turns on the switches only after the soft-start ramping
voltage equals the prebiased output voltage. If the pre-
biased output voltage is greater than the set voltage,
the ZCD circuit turns on the low-side switch (after the
soft-start period is over) to discharge the output capac-
itor until its voltage equals the set voltage.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1951ESA | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1951ESA+ | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1951ESA+T | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1951ESA+TW | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX1951ESA+W | 功能描述:直流/直流开关调节器 1MHz 2A 2.6-5.5V PWM DC/DC Step-Down RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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