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参数资料
| 型号： | MAX1954AEUB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 360kHz |
| 占空比： | 93% |
| 电源电压： | 3 V ~ 13.2 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
Low-Cost, Current-Mode PWM Buck
Controller with Foldback Current Limit
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
HSD
COMP
FB
GND
IN
DL
PGND
DH
LX
BST
FUNCTION
High-Side Drain Current-Sense Input. HSD senses the voltage at the drain of the high-side, N-channel MOSFET.
Connect to the high-side MOSFET drain using a Kelvin connection.
Compensation and Shutdown Control Pin. Connect appropriate RC networks to compensate the control loop.
Pull to GND to shut down the IC. See the Compensation Design section for instructions on calculating the RC
values.
Feedback Input. Regulates at V FB = 0.8V. Connect FB to the center tap of a resistor-divider from the output to
GND to set the output voltage.
Ground
IC Supply Voltage. Provides power for the IC. Connect to a 3V to 5.5V power supply. Bypass to GND with a
0.22μF ceramic capacitor and to PGND with a 1μF ceramic capacitor.
Low-Side Gate-Drive Output. Drives the synchronous-rectifier MOSFET. Swings from 0 to V IN . DL is low in
shutdown and UVLO.
Power Ground
High-Side Gate-Drive Output. Drives the high-side N-channel MOSFET. DH is a floating driver output that swings
from V LX to V BST . DH is low in shutdown and UVLO.
Controller Current-Sense Input. Connect LX to the junction of the MOSFETs and inductor. LX is the reference
point for the current limit.
High-Side MOSFET Supply Input. Connect a 0.1μF ceramic capacitor from BST to LX to supply the necessary
gate drive for the high-side N-channel MOSFET.
Detailed Description
The MAX1954A single-output, current-mode, PWM, step-
down DC-DC controller features foldback current limit
and switches at 300kHz for high efficiency. The
MAX1954A is designed to drive a pair of external N-
channel power MOSFETs in a synchronous buck topolo-
gy to improve efficiency and cost compared with a
P-channel power-MOSFET topology. The on-resistance
of the low-side MOSFET is used for short-circuit current-
limit sensing, while the high-side MOSFET’s on-resis-
tance is used for current-mode feedback, thus
eliminating the need for current-sense resistors. The
short-circuit current limit is fixed at 135mV. The foldback
current scheme reduces the input current during short-
circuit and severe-overload conditions. The MAX1954A
is configured with a high-side drain input (HSD) allowing
an extended input voltage range of 3V to 13.2V that is
independent of the IC input supply (Figure 1).
DC-DC Converter Control Architecture
The MAX1954A step-down converter uses a PWM, cur-
rent-mode control scheme. An internal transconductance
amplifier establishes an integrated error voltage. An
open-loop comparator compares the integrated voltage-
feedback signal against the amplified current-sense sig-
nal plus the slope compensation ramp, which is summed
into the main PWM comparator to preserve inner-loop sta-
bility and eliminate inductor staircasing. At each rising
edge of the internal clock, the high-side MOSFET turns on
until the PWM comparator trips or the maximum duty
cycle is reached. During this on-time, current ramps up
through the inductor, storing energy in a magnetic field
and sourcing current to the output. The current-mode
feedback system regulates the peak inductor current as a
function of the output-voltage error signal. The circuit acts
as a switch-mode transconductance amplifier because
the average inductor current is close to the peak inductor
current (assuming the inductor is large enough to provide
a reasonably small ripple current). This pushes the output
inductance-capacitance filter pole normally found in a
voltage-mode PWM to a higher frequency.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1954AEUB-TG05 | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1954AEUB-TG077 | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1954AEVKIT | 功能描述:电流型 PWM 控制器 Evaluation Kit for the MAX1954A RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1954BEUB | 功能描述:电流型 PWM 控制器 RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX1954BEUB+ | 功能描述:电流型 PWM 控制器 Current-Mode PWM Buck Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
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