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參數(shù)資料
| 型號： | MAX771 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| 中文描述： | 5V/12V/15V或可調(diào)、高效率、低IQ、升壓型DC-DC控制器 |
| 文件頁數(shù)： | 9/20頁 |
| 文件大?。?/td> | 204K |
| 代理商： | MAX771 |
Floating the shunt-regulator ground (SGND) disables
the shunt regulator. To enable it, connect SGND to
GND. The shunt regulator requires 1mA minimum cur-
rent for proper operation; the maximum current must
not exceed 20mA. The MAX773 operates in non-boot-
strapped mode when the shunt regulator is used, and
EXT swings between the 6V shunt-regulator voltage
and GND.
When using the shunt regulator, use an N-channel pow-
er FET instead of an NPN power transistor as the power
switch. Otherwise, excessive base drive will collapse
the shunt regulator.
External Power-T ransistor
Control Circ uitry
PFM Control Scheme
The MAX770–MAX773 use a proprietary current-limited
PFM control scheme to provide high efficiency over a
wide range of load currents. This control scheme com-
bines the ultra-low supply current of PFM converters (or
pulse skippers) with the high full-load efficiency of
PWM converters.
Unlike traditional PFM converters, the MAX770–
MAX773 use a sense resistor to control the peak induc-
tor current. They also operate with high switching
M
5V /12V /15V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controllers
_______________________________________________________________________________________
9
V+
EXT
CONTROL
1.5V
REFERENCE
Q
TRIG
Q
S
F/F
R
Q
TRIG
LOW-VOLTAGE
OSCILLATOR
2.5V
0.1V
0.2V
ONE-SHOT
ONE-SHOT
CURRENT-SENSE
AMPLIFIER
DUAL-MODE
COMPARATOR
LBO V15
V12
V5
FB
LBI
REF
200mV
ERROR
COMPARATOR
SHDN
V+
SGND
6V
EXTH
EXTL
EXT
MAX770
MAX771
MAX772
CS
MAX773 ONLY
MAX770
MAX771
MAX772
BIAS
CIRCUITRY
N
N
N
MAX770–MAX773
MAX773
ONLY
Figure 1. Block Diagram
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX772 | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| MAX773 | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| MAX770 | 5V/12V/15V or Adjustable, High-Efficiency, Low IQ, Step-Up DC-DC Controllers |
| MAX773CPD | Quadruple 2-Input Positive-AND Gates 14-CDIP -55 to 125 |
| MAX773CSD | Quadruple 2-Input Positive-AND Gates 14-CFP -55 to 125 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX771C/D | 功能描述:DC/DC 開關(guān)控制器 5V/12V/15V or Adjustable High-Efficiency Low-IQ Step-Up DC-DC Controllers RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| MAX771C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX771C/D+ | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| MAX771CPA | 功能描述:DC/DC 開關(guān)控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| MAX771CPA+ | 功能描述:DC/DC 開關(guān)控制器 5/12/15/AdjV Step Up DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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