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参数资料
| 型号： | MAX15046BAEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.1MHz |
| 占空比： | 87.5% |
| 电源电压： | 4.5 V ~ 40 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 ~ 125°C |
| 封装/外壳： | 16-LSSOP（0.154"，3.90mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX15046
40V, High-Performance, Synchronous
Buck Controller
to function properly. The stray impedance in the gate
discharge path can cause the sense circuitry to interpret
the MOSFET gate as “off” while the V GS of the MOSFET
is still high. To minimize stray impedance, use very short,
wide traces.
Synchronous rectification reduces conduction losses in
the rectifier by replacing the normal low-side Schottky
catch diode with a low-resistance MOSFET switch. The
MAX15046 features a robust internal pulldown transistor
with a typical 1 I R DS(ON) to drive DL low. This low on-
resistance prevents DL from being pulled up during the
fast rise time of the LX node, due to capacitive coupling
from the drain to the gate of the low-side synchronous
rectifier MOSFET.
High-Side Gate-Drive Supply (BST)
An external Schottky diode between BST and DH is
required to boost the gate voltage above LX providing
the necessary gate-to-source voltage to turn on the high-
side MOSFET. The boost capacitor connected between
BST and LX holds up the voltage across the gate driver
during the high-side MOSFET on-time.
The charge lost in the boost capacitor for delivering the
gate charge is replenished when the high-side MOSFET
turns off and the LX node goes to ground. When LX is
low, the external diode between V DRV and BST recharg-
es the boost capacitor. See the Boost Capacitor and
Diode Selection section in the Applications Information
to choose the right boost capacitor and diode.
Enable Input (EN), Soft-Start, and Soft-Stop
Drive EN high to turn on the MAX15046. A soft-start
sequence starts to increase (step-wise) the reference
voltage of the error amplifier. The duration of the soft-
start ramp is 2048 switching cycles and the resolution is
1/64th of the steady-state regulation voltage allowing a
smooth increase of the output voltage. A logic-low on EN
initiates a soft-stop sequence by stepping down the ref-
erence voltage of the error amplifier. After the soft-stop
sequence is completed, the MOSFET drivers are both
turned off. See Figure 1. Soft-stop operation is disabled
for the MAX15046C.
Connect EN to V CC for always-on operation. Owing to
the accurate turn-on/-off thresholds, EN can be used
as a UVLO adjustment input, and for power sequencing
together with the PGOOD outputs.
UVLO
A
B
C
D
E
F
G
H
I
V CC
EN
V OUT
DAC_VREF
DH
DL
2048 CLOCK
CYCLES
2048 CLOCK
CYCLES
SYMBOL
UVLO
V CC
EN
V OUT
DAC_VREF
DH
DL
A
DEFINITION
Undervoltage threshold value is provided in
the Electrical Characteristics table.
Internal 5.25V linear regulator output.
Active-high enable input.
Regulator output voltage.
Regulator internal soft-start and soft-stop signal.
Regulator high-side gate-driver output.
Regulator low-side gate-driver output.
V CC rising while below the UVLO threshold.
EN is low.
SYMBOL
B
C
D
E
F
G
H
I
DEFINITION
V CC is higher than the UVLO threshold. EN is low.
EN is pulled high. DH and DL start switching.
Normal operation.
V CC drops below UVLO.
V CC goes above the UVLO threshold. DH and DL
start switching. Normal operation.
EN is pulled low. V OUT enters soft-stop.
EN is pulled high. DH and DL start switching.
Normal operation.
V CC drops below UVLO.
Figure 1. Power On-Off Sequencing
Maxim Integrated
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX15046BEEE+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX15046BEVKIT+ | 功能描述:电源管理IC开发工具 MAX15046B 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 |
| MAX15046CAEE+ | 功能描述:DC/DC 开关控制器 40V Synch Buck Controller 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 |
| MAX15046CAEE+T | 功能描述:DC/DC 开关控制器 40V Synch Buck Controller 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 |
| MAX15046EEE+ | 功能描述:DC/DC 开关控制器 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 |
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