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参数资料
| 型号： | MAX797CSE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 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，混合 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 96% |
| 电源电压： | 4.5 V ~ 30 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： | 0°C ~ 70°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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Step-Down Controllers 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
SECFB
(MAX796/
MAX799)
SKIP
(MAX797)
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.
Secondary winding Feedback input. Normally connected to a resistor divider from an auxiliary output.
Don’t leave SECFB unconnected.
? MAX796: SECFB regulates at VSECFB = 2.505V. Tie to VL if not used.
? MAX799: SECFB regulates at VSECFB = 0V. Tie to a negative voltage through a high-value current-limit-
ing resistor (I MAX = 100μA) if not used.
Disables pulse-skipping mode when high. Connect to GND for normal use. Don’t leave SKIP unconnected.
With SKIP grounded, the device will automatically change from pulse-skipping operation to full PWM opera-
tion when the load current exceeds approximately 30% of maximum. (See Table 3.)
Reference voltage output. Bypass to GND with 0.33μF minimum.
Low-noise analog Ground and feedback reference point.
Oscillator Synchronization and frequency select. Tie 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 the
Electrical Characteristics table for V IH and V IL specifications). SYNC capture range is 190kHz to 340kHz
guaranteed.
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 FB to a resistor divider for adjustable mode. FB can be driven with +5V rail-to-rail logic in order 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. 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. VL 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. Normally drives the synchronous-rectifier MOSFET. Swings 0V to VL.
Boost capacitor connection for high-side gate drive (0.1μF).
Switching node (inductor) connection. Can swing 2V below ground without hazard.
High-side gate-drive output. Normally drives the main buck switch. DH 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.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX797EPE | 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 |
| MAX797EPE+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX797ESE | 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 |
| MAX797ESE/GG8 | 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 |
| MAX797ESE/GG8-T | 制造商:Maxim Integrated Products 功能描述:STEP DOWN CONTROLLER - Tape and Reel |
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