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參數(shù)資料
| 型號： | MAX764 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ DC-DC Inverters |
| 中文描述： | -5V/-12V/-15V或可調(diào)、高效率、低IQ、DC-DC反相器 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 132K |
| 代理商： | MAX764 |
M
-5V /-12V /-15V or Adjustable,
High-Effic ienc y, Low I
Q
DC-DC Inverters
8
_______________________________________________________________________________________
_______________Detailed Desc ription
Operating Princ iple
The MAX764/MAX765/MAX766 are BiCMOS, inverting,
switch-mode power supplies that provide fixed outputs
of -5V, -12V, and -15V, respectively; they can also be
set to any desired output voltage using an external
resistor divider. Their unique control scheme combines
the advantages of pulse-frequency modulation (pulse
skipping) and pulse-width modulation (continuous puls-
ing). The internal P-channel power MOSFET allows
peak currents of 0.75A, increasing the output current
capability over previous pulse-frequency-modulation
(PFM) devices. Figure 1 shows the MAX764/MAX765/
MAX766 block diagram.
The MAX764/MAX765/MAX766 offer three main
improvements over prior solutions:
1) They can operate with miniature (less than 5mm
diameter) surface-mount inductors, because of their
300kHz switching frequency.
2) The current-limited PFM control scheme allows efficien-
cies exceeding 80% over a wide range of load currents.
3) Maximum quiescent supply current is only 120μA.
Figures 2 and 3 show the standard application circuits
for these devices. In these configurations, the IC is
powered from the total differential voltage between the
input (V+) and output (V
OUT
). The principal benefit of
this arrangement is that it applies the largest available
signal to the gate of the internal P-channel power MOS-
FET. This increased gate drive lowers switch on-resis-
tance and increases DC-DC converter efficiency.
Since the voltage on the LX pin swings from V+ (when the
switch is ON) to
I
V
OUT
I
plus a diode drop (when the
MAX764
MAX765
MAX766
P
TRIG
Q
ONE-SHOT
TRIG
Q
ONE-SHOT
S
R
Q
CURRENT
CONTROL CIRCUITS
1.5V
REFERENCE
N
FROM OUT
FROM V+
FROM V+
0.1V
(HALF
CURRENT)
0.2V
(FULL
CURRENT)
GND
LX
V+
OUT
V+
REF
SHDN
ERROR
COMPARATOR
COMPARATOR
CURRENT
COMPARATOR
FB
Figure 1. Block Diagram
相關(guān)PDF資料 |
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| MAX766CPA | -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ DC-DC Inverters |
| MAX766CSA | -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ DC-DC Inverters |
| MAX766EPA | -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ DC-DC Inverters |
| MAX767EAP | 5V-to-3.3V, Synchronous, Step-Down Power-Supply Controller |
| MAX767TCAP | 5V-to-3.3V, Synchronous, Step-Down Power-Supply Controller |
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| MAX7645ACPP+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-Bit Buffered DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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| MAX7645ACWP | 功能描述:數(shù)模轉(zhuǎn)換器- DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
| MAX7645ACWP+ | 功能描述:數(shù)模轉(zhuǎn)換器- DAC 12-Bit Buffered DAC RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換器數(shù)量:1 DAC 輸出端數(shù)量:1 轉(zhuǎn)換速率:2 MSPs 分辨率:16 bit 接口類型:QSPI, SPI, Serial (3-Wire, Microwire) 穩(wěn)定時間:1 us 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-14 封裝:Tube |
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