- 您现在的位置：买卖IC网 > PDF目录14545 > MAX1951ESA+T (Maxim Integrated Products)IC REG BUCK SYNC ADJ 2A 8SOIC PDF资料下载
参数资料
| 型号： | MAX1951ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/15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, All-Ceramic, 2.6V to 5.5V Input,
2A PWM Step-Down DC-to-DC Regulators
V CC
OSC
POSITIVE AND NEGATIVE CURRENT LIMITS
CLOCK
IN
CURRENT SENSE
RAMP GEN SLOPE
COMP
PWM
CONTROL
LX
COMP
CLAMP
ERROR
SIGNAL
SOFT-START/
UVLO
THERMAL
SHUTDOWN
REF
DAC
2V
g m
PGND
FB
REF
BANDGAP
REF
1.25V
MAX1951
GND
Figure 1. Functional Diagram
through the high-side MOSFET body diode, back to the
input, until the beginning of the next cycle or until the
inductor current drops to zero. The MAX1951/MAX1952
utilize a pulse-skip mode to prevent overheating during
short-circuit output conditions. The device enters pulse-
skip mode when the FB voltage drops below 300mV, lim-
iting the current to 3A (typ) and reducing power
dissipation. Normal operation resumes upon removal of
the short-circuit condition.
V CC Decoupling
Due to the high switching frequency and tight output
tolerance (1%), decouple V CC with a 0.1μF capacitor
connected from V CC to GND, and a 10 Ω resistor con-
nected from V CC to IN. Place the capacitor as close to
V CC as possible.
Soft-Start
The MAX1951/MAX1952 employ digital soft-start circuitry
to reduce supply inrush current during startup conditions.
When the device exits undervoltage lockout (UVLO), shut-
down mode, or restarts following a thermal-overload
event, or the external pulldown on COMP is released, the
digital soft-start circuitry slowly ramps up the voltages at
REF and FB (see the Soft-Start Waveforms in the Typical
Operating Characteristics) .
Undervoltage Lockout
If V CC drops below 2.25V, the UVLO circuit inhibits
switching. Once V CC rises above 2.35V, the UVLO
clears, and the soft-start sequence activates.
Compensation
and Shutdown Mode
The output of the internal transconductance voltage
error amplifier connects to COMP. The normal operation
voltage for COMP is 1V to 2.2V. To shut down the
MAX1951/MAX1952, use an NPN bipolar junction
transistor or a very low output capacitance open-drain
MOSFET to pull COMP to GND. Shutdown mode causes
the internal MOSFETs to stop switching, forces LX to a
high-impedance state, and shorts REF to GND.
Release COMP to exit shutdown and initiate the soft-
start sequence.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation
in the device. When the junction temperature exceeds T J
= +160°C, a thermal sensor forces the device into shut-
down, allowing the die to cool. The thermal sensor turns
the device on again after the junction temperature cools
by 15°C, resulting in a pulsed output during continuous
overload conditions. Following a thermal-shutdown condi-
tion, the soft-start sequence begins.
8
_______________________________________________________________________________________
相关PDF资料 |
PDF描述 |
|---|---|
| GMC20DRTN | CONN EDGECARD 40POS DIP .100 SLD |
| GSC20DRTH | CONN EDGECARD 40POS DIP .100 SLD |
| GMC20DRTH | CONN EDGECARD 40POS DIP .100 SLD |
| GCC31DRTF | CONN EDGECARD 62POS DIP .100 SLD |
| EMC15DRYS | CONN EDGECARD 30POS DIP .100 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1951ESA-TG05 | 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 |
| MAX1951EVKIT | 功能描述:直流/直流开关调节器 Evaluation Kit for the MAX1951 MAX1952 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 |
| MAX19526EVKIT+ | 制造商:Maxim Integrated Products 功能描述:ANALOG TO DIGITAL CONVERTER - Boxed Product (Development Kits) |
| MAX19526EXE+ | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) Analog to Digital Converters - IC ADC 12BIT 8CH 40MSPS 144CTBGA RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX19526EXE+T | 功能描述:模数转换器 - ADC Integrated Circuits (ICs) Analog to Digital Converters - IC ADC 12BIT 8CH 40MSPS 144CTBGA RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
发布紧急采购，3分钟左右您将得到回复。