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参数资料
| 型号： | MAX1655 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
| 中文描述： | 高效率、PWM、降压型DC-DC控制器，16引脚QSOP封装 |
| 文件页数： | 9/28页 |
| 文件大小： | 265K |
| 代理商： | MAX1655 |
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M
High-Effic ienc y, PWM, S tep-Down
DC-DC Controllers in 16-Pin QS OP
_______________________________________________________________________________________
9
Pin Desc ription
Dual Mode is a trademark of Maxim Integrated Products.
SKIP
(MAX1653/
MAX1655)
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 (Table 3).
16
DH
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.
15
LX
Switching Node (inductor) Connection. Can swing 2V below ground without hazard.
14
BST
Boost Capacitor Connection for High-Side Gate Drive (0.1μF)
13
DL
Low-Side Gate-Drive Output. Normally drives the synchronous-rectifier MOSFET. Swings from 0V to VL.
NAME
FUNCTION
1
SS
Soft-Start Timing Capacitor Connection. Ramp time to full current limit is approximately 1ms/nF.
2
SECFB
(MAX1652/
MAX1654)
Secondary Winding Feedback Input. Normally connected to a resistor divider from an auxiliary output.
Don’t leave SECFB unconnected.
MAX1652: SECFB regulates at VSECFB = 2.50V. Tie to VL if not used.
MAX1654: SECFB regulates at VSECFB = 0V. Tie to a negative voltage through a high-value current-
limiting resistor (I
MAX
= 100μA) if not used.
PIN
3
REF
Reference Voltage Output. Bypass to GND with 0.33μF minimum.
7
FB
Feedback Input. Regulates at the feedback voltage 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 CMOS logic in order to
change the output voltage under system control.
6
SHDN
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.
5
SYNC
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 0 to 5V logic levels (see the
Electrical Characteristics table for V
IH
and V
IL
specifications). SYNC capture range is 190kHz to 340kHz.
4
GND
Low-Noise Analog Ground and Feedback Reference Point
12
PGND
Power Ground
11
VL
5V Internal Linear-Regulator Output. VL is also the supply voltage rail for the chip. VL is switched to the out-
put 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.
10
V+
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.
9
CSL
Current-Sense Input, low side. Also serves as the feedback input in fixed-output modes.
8
CSH
Current-Sense Input, high side. Current-limit level is 100mV referred to CSL.
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|---|---|
| MAX1655EEE | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1655EEE | 功能描述:DC/DC 开关控制器 PWM Step-Down 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 |
| MAX1655EEE+ | 功能描述:DC/DC 开关控制器 PWM Step-Down 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 |
| MAX1655EEE+T | 功能描述:DC/DC 开关控制器 PWM Step-Down 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 |
| MAX1655EEE-T | 功能描述:DC/DC 开关控制器 PWM Step-Down 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 |
| MAX1655ESE | 功能描述:DC/DC 开关控制器 PWM Step-Down 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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