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參數(shù)資料
| 型號(hào)： | MAX1927 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Fixed-Point Digital Signal Processor 288-FCBGA |
| 中文描述： | 低輸出電壓、800mA、PWM降壓型DC-DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 303K |
| 代理商： | MAX1927 |
M
Low-Output-Voltage, 800mA, PWM Step-Down
DC-DC Converters
_______________________________________________________________________________________
7
Pin Description
PIN
NAME
FUNCTION
1
PWM
Forced-PWM Input. Drive to GND to use PWM at medium to heavy loads and pulse-skipping at light loads.
Drive to BATT to force PWM operation at all loads.
2
3
GND
REF
Ground
Internal 1.25V Reference. Bypass to GND with a 0.1μF capacitor.
4
FB
Output Feedback Sense Input. To set the output voltage to the preset voltage (MAX1928), connect FB directly
to the output. To adjust the output voltage (MAX1927R), connect FB to the center of an external resistor-
divider between the output and GND. FB regulation voltage is 0.75V.
5
COMP
Compensation Input. See the
Compensation, Stability, and Output Capacitor
section for compensation
component selection.
6
7
8
9
SHDN
PGND
LX
BATT
Shutdown Control Input. Drive low to shut down the converter. Drive high for normal operation.
Power Ground
Inductor Connection to the drains of the internal power MOSFETs.
Supply Voltage Input. Connect to a 2.6V to 5.5V source. Bypass to GND with a low-ESR 10μF capacitor.
10
POK
Power-OK Open-Drain Output. Once the soft-start routine has completed, POK goes high impedance 20ms
after FB exceeds 90% of its expected final value.
N
N
P
P
SLOPE
COMPENSATION
CONTROL
OSC
BIAS
COMP
BATT
CPWM
RE1.25V
PFM CURRENT
COMPARPWM
PWM
ILIM
COMPARATOR
TO
COMP
N-CHANNEL
PGND
POK
FB
REF
MAX1927R
ONLY
GND
MAX1928
ONLY
LX
SHDN
MAX1927
Figure 1. Simplified Functional Diagram
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1927REUB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1927REUB+ | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1927REUB+T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1927REUB-G05 | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| MAX1927REUB-T | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 800mA PWM Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
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