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| 型号： | MAX15049ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/31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： | 1 |
| 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： | 管件 |
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MAX15048/MAX15049
Triple-Output Buck Controllers
with Tracking/Sequencing
MOSFET Gate Drivers and
Internal Boost Switch
DREG_ is the supply input for the low-side MOSFET
driver. Connect DREG_ to REG externally. Every time
the low-side MOSFET switches on, high peak current
is drawn from DREG_ for a short time. Adding an RC
filter (1 I to 4.7 I and 220nF ceramic capacitors are
typical) from REG to DREG_ filters out these high-peak
currents. Alternatively, DREG_ can be connected to an
external source (V DREG-EXT ). Note that the DREG_ volt-
age should be high enough to fully enhance the low-side
MOSFET. To avoid partial enhancing of the MOSFETs,
use V DREG-EXT to set the UVLO externally using EN1.
BST_ supplies the power for the high-side MOSFET drivers.
The MAX15048/MAX15049 consist of an internal switch
between DREG_ and BST_ to boost DH_ voltage above
V IN , providing the necessary gate-to-source voltage to
turn on the high-side MOSFET. Connect a bootstrap
0.1 F F or higher ceramic capacitor between BST_ and
LX_.
The high-side (DH_) and low-side (DL_) drivers drive the
gates of the external n-channel MOSFETs. The drivers’
1A peak source-and-sink-current capability provides
ample drive for the fast rise and fall times of the switch-
ing MOSFETs. Faster rise and fall times result in reduced
switching losses.
The gate-driver circuitry also provides a break-before-
make time (35ns typ) to prevent shoot-through currents
during transition.
MAX15048 Coincident/
Ratiometric Tracking (EN_)
The enable input (EN_) in conjunction with digital soft-
start and soft-stop provide coincident/ratiometric track-
ing. Track an output voltage by connecting a resistive
voltage-divider from the output being tracked to the
enable/tracking input. For example, for V OUT2 to coin-
cidentally track V OUT1 , connect the same resistive
voltage-divider used for FB2 from OUT1 to EN2
to SGND. See Figure 2 and the Typical Operating
Characteristics (Coincident Tracking).
Track ratiometrically by connecting EN_ to SGND. This
synchonizes the soft-start and soft-stop of all the control-
lers’ references, and hence their respective output volt-
ages track ratiometrically. See Figure 2 and the Typical
Operating Characteristics (Ratiometric Tracking).
For the MAX15048, the output short-circuit fault situa-
tions at master or slave outputs are handled carefully
Maxim Integrated
so that either the master or slave output does not stay
on when the other outputs are shorted to ground. When
the slave is shorted and enters in hiccup mode, both
the master and the other slave soft-stop. When the
master is shorted and the part enters hiccup mode, the
slaves ratiometrically soft-stop. Coming out of the hic-
cup, all outputs soft-start coincidently or ratiometrically
depending on their initial configuration. See the Typical
Operating Characteristics for the output behavior dur-
ing the fault conditions. During the thermal shutdown or
power-off when the input falls below its UVLO, the output
voltages fall down at a rate depending on the respective
output capacitor and load.
See Figure 1 for a graphical representation of coinci-
dent/ratiometric tracking (MAX15048) or sequencing
(MAX15049).
V OUT1
V OUT2
V OUT3
SOFT-START SOFT-STOP
a) COINCIDENT TRACKING OUTPUTS
V OUT1
V OUT2
V OUT3
SOFT-START SOFT-STOP
b) RATIOMETRIC TRACKING OUTPUTS
V OUT1
V OUT2
V OUT3
SOFT-START
c) SEQUENCED OUTPUTS*
* THE FALLING EDGES OF THE MAX15049 DEPEND ON THE LOAD CURRENT.
Figure 1. Graphical Representation of Coincident Tracking,
Ratiometric Tracking (MAX15048), or Sequencing (MAX15049)
17
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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 |
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