- 您现在的位置：买卖IC网 > PDF目录16704 > MAX15048ETJ+T (Maxim Integrated Products)IC CTRLR PWM STP-DN TRIPL 32WQFN PDF资料下载
参数资料
| 型号： | MAX15048ETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/31页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR PWM STP-DN TRIPL 32WQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源控制器，序列发生器 |
| 电源电压： | 4.7 V ~ 23 V |
| 电流 - 电源： | 6mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页当前第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
MAX15048/MAX15049
Triple-Output Buck Controllers
with Tracking/Sequencing
Detailed Description
The MAX15048/MAX15049 are triple-output, PWM, step-
down, DC-DC controllers with tracking and sequencing
options. The devices operate over the 4.7V to 23V or 5V
Q 10% input voltage range. Each PWM controller pro-
vides an adjustable output down to 0.6V and delivers up
to 15A of load current with excellent load and line regu-
lation. The MAX15049 can start into prebiased outputs.
This ensures the glitch-free output voltage power-up in
the case of parallel power modules. The MAX15048/
MAX15049 are optimized for high performance, small-
size power-management solutions.
Each of the MAX15048/MAX15049 PWM sections utilizes
a voltage-mode control scheme for good noise immunity
and offer external compensation, allowing for maximum
flexibility with a wide selection of inductor values and
capacitor types. The devices operate at a fixed switching
frequency that is programmable from 200kHz to 1.2MHz.
Each converter, operating at up to 1.2MHz with 120° out-
of-phase, increases the input capacitor ripple frequency
up to 3.6MHz, reducing the RMS input-ripple current
and the size of the input bypass capacitor requirement
significantly.
The MAX15048 provides either coincident tracking
or ratiometric tracking, and the MAX15049 provides
sequencing. This allows tailoring of the power-up/power-
down sequence depending on the system requirements.
The MAX15048/MAX15049 integrate boost diodes for
additional system cost savings.
The MAX15048/MAX15049 feature lossless valley-mode
current-limit protection through monitoring the voltage
drop across the synchronous MOSFET’s on-resistance.
The internal current source of these devices exhibits a
positive temperature coefficient to help compensate for
the MOSFET’s temperature coefficient.
The MAX15048/MAX15049 include internal UVLO with
hysteresis, digital soft-start, and soft-stop (the MAX15048
only) for glitch-free power-up and power-down of the
converter. The power-good circuitry (PGOOD) monitors
all three outputs and provides a PGOOD signal to a
system controller/processor indicating when all outputs
are within regulation. Protection features include lossless
valley-mode current limit, hiccup mode output short-
circuit protection, and thermal shutdown.
Internal Undervoltage Lockout (UVLO)
V IN must exceed the default UVLO threshold before any
operation can commence. The UVLO circuitry keeps the
16
MOSFET drivers, oscillator, and all the internal circuitry
shut down to reduce current consumption. The UVLO
rising threshold is 4.2V with 300mV hysteresis.
Digital Soft-Start (MAX15048/MAX15049)/
Soft-Stop (MAX15048)/
Prebiased Output (MAX15049)
The soft-start feature of the MAX15048/MAX15049 allows
the load voltage to ramp up in a controlled manner, elimi-
nating output-voltage overshoot. Soft-start begins after
V IN exceeds the UVLO threshold and the enable input
is above 0.6V. The soft-start circuitry gradually ramps up
the reference voltage. This controls the rate of rise of the
output voltage and reduces input surge currents during
startup. The soft-start duration is 2048 clock cycles. The
output voltage is incremented through 64 equal steps.
The output reaches regulation when soft-start is com-
pleted, regardless of output capacitance and load.
For the MAX15048, soft-stop commences when the
enable input falls below 0.55V. The soft-stop circuitry
ramps down the reference voltage controlling the output
voltage rate of fall. The output voltage is decremented
through 64 equal steps in 2048 clock cycles.
The MAX15049 can start into a prebiased load. During
soft-start, both switches are kept off until the PWM com-
parator commands the first PWM pulse. Until then, the
converters do not sink current from the outputs. The first
PWM pulse occurs when the ramping reference voltage
increases above the FB_ voltage.
Internal Linear Regulator (REG)
REG is the output terminal of a 5V LDO powered from
IN, which provides power to the IC. Connect REG
externally to DREG_ to provide power for the low-side
MOSFET gate drivers. Bypass REG to SGND with a
minimum 2.2 F F ceramic capacitor. Place the capacitor
physically close to the MAX15048/MAX15049 to provide
good bypassing. REG is intended for powering only
the internal circuitry and should not be used to supply
power to external loads. REG can source up to 60mA.
This current, I REG , includes quiescent current (I Q ) and
gate-drive current (I DREG_ ):
I REG = I Q + [f SW OC (Q GHS_ + Q GLS_ )]
where Q GHS_ and Q GLS_ equal the total gate charge
of each of the respective high- and low-side external
MOSFETs at V GATE = 5V, f SW is the switching frequency
of the converter, and I Q is the quiescent current of the
device at the switching frequency.
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| H3CCH-2036G | IDC CABLE - HKC20H/AE20G/HKC20H |
| 234A042-25/225-0 | BOOT MOLDED |
| H1BXH-2636M | IDC CABLE - HSR26H/AE26M/X |
| A1BXH-2436G | IDC CABLE - ASR24H/AE24G/X |
| MAX6043BAUT10#TG16 | IC VREF SERIES PREC 10V SOT-6 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15049ETJ+ | 功能描述:DC/DC 开关控制器 1.2MHz Triple Buck w/Tracking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15049ETJ+ | 制造商:Maxim Integrated Products 功能描述:IC BUCK CNTRL TRIPLE 32WQFN 制造商:Maxim Integrated Products 功能描述:IC, BUCK, CNTRL, TRIPLE, 32WQFN |
| MAX15049ETJ+ | 制造商:Maxim Integrated Products 功能描述:IC PWM STEP-DOWN DC/DC CONVER |
| MAX15049ETJ+T | 功能描述:DC/DC 开关控制器 1.2MHz Triple Buck w/Tracking RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX15049EVKIT+ | 功能描述:电源管理IC开发工具 MAX15049 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
发布紧急采购，3分钟左右您将得到回复。