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参数资料
| 型号： | MAX765ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG INV -12V/ADJ 0.12A 8SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 反相 |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | -12V，-1 V ~ -16 V |
| 输入电压： | 3 V ~ 16 V |
| 频率 - 开关： | 300kHz |
| 电流 - 输出： | 120mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low I Q DC-DC Inverters
switch is OFF), the range of input and output voltages is
limited to a 21V absolute maximum differential voltage.
When output voltages more negative than -16V are
required, substitute the MAX764/MAX765/MAX766 with
Maxim’s MAX774/MAX775/MAX776 or MAX1774, which
use an external switch.
V IN
PFM Control Scheme
The MAX764/MAX765/MAX766 use a proprietary, cur-
rent-limited PFM control scheme that blends the best
features of PFM and PWM devices. It combines the
ultra-low supply currents of traditional pulse-skipping
PFM converters with the high full-load efficiencies of
current-mode pulse-width modulation (PWM) convert-
ers. This control scheme allows the devices to achieve
high efficiencies over a wide range of loads, while the
current-sense function and high operating frequency
C1
120 μ F
20V
C2
0.1 μ F
1
3
OUT
SHDN
MAX764
MAX765
V+
V+
7
6
allow the use of miniature external components.
As with traditional PFM converters, the internal power
MOSFET is turned on when the voltage comparator
senses that the output is out of regulation (Figure 1).
However, unlike traditional PFM converters, switching is
MAX766
accomplished through the combination of a peak cur-
2
FB
LX
8
D1
1N5817
V OUT
rent limit and a pair of one-shots that set the maximum
on-time (16μs) and minimum off-time (2.3μs) for the
C3
0.1 μ F
4
REF
GND
5
L1
47 μ H
C4
68 μ F
20V
switch. Once off, the minimum off-time one-shot holds
the switch off for 2.3μs. After this minimum time, the
switch either 1) stays off if the output is in regulation, or
2) turns on again if the output is out of regulation.
The MAX764/MAX765/MAX766 limit the peak inductor
current, which allows them to run in continuous-con-
PRODUCT
MAX764
MAX765
MAX766
OUTPUT
VOLTAGE (V)
-5
-12
-15
INPUT
VOLTAGE (V)
3 to 15
3 to 8
3 to 5
duction mode and maintain high efficiency with heavy
loads. (See the photo Continuous Conduction at Full
Current Limit in the Typical Operating Characteristics.)
This current-limiting feature is a key component of the
control circuitry. Once turned on, the switch stays on
until either 1) the maximum on-time one shot turns it off
Figure 2. Fixed Output Voltage Operation
V IN
(16μs later), or 2) the current limit is reached.
To increase light-load efficiency, the current limit is set to
half the peak current limit for the first two pulses. If those
pulses bring the output voltage into regulation, the volt-
C1
120 μ F
20V
C2
0.1 μ F
1
OUT
V+
7
age comparator holds the MOSFET off and the current
limit remains at half the peak current limit. If the output
voltage is still out of regulation after two pulses, the cur-
rent limit is raised to its 0.75A peak for the next pulse.
R2
3
SHDN MAX764
MAX765
V+
6
(See the photo Discontinuous Conduction at Half and Full
Current Limit in the Typical Operating Characteristics.)
R1
C3
0.1 μ F
2
4
FB
REF
MAX766
GND
5
LX
8
L1
47 μ H
D1
1N5817
C4
68 μ F
20V
V OUT
-1V to
-16V
Shutdown Mode
When SHDN is high, the MAX764/MAX765/MAX766
enter a shutdown mode in which the supply current
drops to less than 5μA. In this mode, the internal biasing
circuitry (including the reference) is turned off and OUT
discharges to ground. SHDN is a TTL/CMOS-logic level
input. Connect SHDN to GND for normal operation.
With a current-limited supply, power-up the device while
unloaded or in shutdown mode (hold SHDN high until V+
exceeds 3.0V) to save power and reduce power-up cur-
rent surges. (See the Supply Current vs. Supply Voltage
Figure 3. Adjustable Output Voltage Operation
graph in the Typical Operating Characteristics.)
_______________________________________________________________________________________
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相关代理商/技术参数 |
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| MAX765MJA | 功能描述:直流/直流开关调节器 RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX7663AC/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX766C/D | 功能描述:直流/直流开关调节器 -15V or Adjustable High-Efficiency Low IQ DC-DC Inverters RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX766C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX766CPA | 功能描述:直流/直流开关调节器 Integrated Circuits (ICs) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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