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| 型号： | MAX797HESE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 5/8页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 混合物 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 96% |
| 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 ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
High-Voltage, Step-Down Controller with
Synchronous Rectifier for CPU Power
______________________________________________________________Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
NAME
SS
SKIP
REF
GND
SYNC
SHDN
FB
CSH
CSL
V+
VL
PGND
DL
BST
LX
DH
FUNCTION
Soft-Start Timing Capacitor Connection. Ramp time to full current limit is approximately 1ms/nF.
Disables pulse-skipping mode when high. Connect SKIP to GND for normal use. Do not leave unconnected.
With SKIP grounded, the device automatically changes from pulse-skipping operation to full PWM operation
when the load current exceeds approximately 30% of maximum.
Reference Voltage Output. Bypass REF to GND with 0.33μF minimum.
Low-noise Analog Ground and Feedback Reference Point
Oscillator Synchronization and Frequency Select. Tie SYNC to GND or VL for 150kHz operation; tie to REF for
300kHz operation. A high-to-low transition begins a new cycle. Drive SYNC with 0V to 5V logic levels (see
Electrical Characteristics for V IH and V IL specifications). SYNC capture range is guaranteed to be 190kHz to
340kHz.
Shutdown Control Input, Active Low. Logic threshold is set at approximately 1V (V TH of an internal N-channel
MOSFET). Tie SHDN to V+ for automatic start-up.
Feedback Input. Regulates at FB = REF (approximately 2.505V) in adjustable mode. FB is a Dual Mode TM
input that also selects the fixed-output voltage settings as follows:
? Connect to GND for 3.3V operation.
? Connect to VL for 5V operation.
? Connect to a resistor divider for adjustable mode. FB can be driven with 5V Rail-to-Rail? logic to change
the output voltage under system control.
Current-Sense Input, High Side. Current-limit level is 100mV referred to CSL.
Current-Sense Input, Low Side. CSL also serves as the feedback input in fixed-output modes.
Battery Voltage Input (4.5V to 30V). Bypass V+ to PGND close to the IC with a 0.1μF capacitor. Connects to a
linear regulator that powers VL.
5V Internal Linear-Regulator Output. VL is also the supply-voltage rail for the chip. It is switched to the output
voltage via CSL (V CSL > 4.5V) for automatic bootstrapping. Bypass to GND with 4.7μF. VL can supply up to
5mA for external loads.
Power Ground
Low-Side Gate-Drive Output. DL normally drives the synchronous-rectifier MOSFET. Swings 0V to VL.
Boost Capacitor Connection for High-Side Gate Drive (0.1μF)
Switching Node (inductor) Connection. LX can swing 2V below ground without hazard.
High-Side Gate-Drive Output. DH normally drives the main buck switch. It is a floating driver output that
swings from LX to BST, riding on the LX switching-node voltage.
Dual Mode is a trademark of Maxim Integrated Products.
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX797MJE | 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 |
| MAX797MSA/PR | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX797MSE/R70874 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX798ESE | 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 |
| MAX798ESE+ | 功能描述:直流/直流开关转换器 Step-Down Controller for CPU Power RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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