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参数资料
| 型号： | MAX1775EEE-T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| PWM 型： | 控制器 |
| 输出数： | 2 |
| 频率 - 最大： | 1.25MHz |
| 占空比： | 100% |
| 电源电压： | 2.7 V ~ 28 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
Dual-Output Step-Down
DC-DC Converter for PDA/Palmtop Computers
IN 2.7V TO 28V
C1
6
8
1 μ F
IN
CVH
M1
C6
10 μ F
ON
OFF
1
SHDNM
PDRV
7
R1
21m ?
MAIN
3.3V
ON
OFF
2
SHDNC
NDRV
4
L M
10 μ H
R2
2A
C4
47 μ F
PGND
GND
INC
C5
C2
1 μ F
C3
0.22 μ F
5 CVL
9
REF
3
14
MAX1775
11
CS+
12
CS-
15
10
FBM
LXC 16
M2
L C
5.4 μ H
R4
CORE
1.8V
22 μ F 1.5A
R3
FBC
13
R5
Figure 4. High Input Voltage Cascaded Configuration
R 1 =
(
)
Design Procedure
Low-Voltage Configuration
To improve efficiency and conserve board space, the
core regulator operates from low input voltages, taking
advantage of internal low-voltage, low-on-resistance
MOSFETs. When the input voltage remains below 5.5V,
run the core converter directly from the input by con-
necting INC to IN (Figure 1). This configuration takes
advantage of the core ’s low-voltage design and
improves efficiency.
High-Voltage Configuration
For input voltages greater than 5.5V, cascade the main
and core converters by connecting INC to the main out-
put voltage. In this configuration (Figure 4), the core
converter is powered from the main output. Ensure that
the main output can simultaneously supply its load and
the core input current. In this configuration, the main
output voltage must be set above the 2.6V minimum
input voltage of the core converter.
Setting the Output Voltages
The main output voltage may be set from +1.25V and
+5.5V with two external resistors connected as a volt-
age-divider to FBM (Figure 1). Resistor values can be
calculated by the following equation:
R2 = R3 [(V OUTM / V FBM ) - 1]
where V FBM = +1.25V. Choose R3 to be 40k ? or less.
The core regulator output is adjustable from +1.0V to
+5.0V through two external resistors connected as a
voltage-divider to FBC (Figure 1). Resistor values can
be calculated through the following equation:
R4 = R5 [(V OUTC / V FBC ) - 1]
where V FBC = +1.0V. Choose R5 to be 30k ? or less.
Setting the Current Limit
The main regulator current limit is set externally through
a small current-sense resistor, R1 (Figure 1). The value
of R1 can be calculated by the following equation:
V CLM
1 . 3 I OUT
where V CLM = 80mV is the current-sense threshold,
and I OUT is the current delivered to the output. The
core converter current limit is set internally and cannot
be modified.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1775EEE-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1775EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1775 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1776EUA | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1776EUA+ | 功能描述:直流/直流开关转换器 24V 600mA 100% Duty Cycle Step-Down RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1776EUA+ | 制造商:Maxim Integrated Products 功能描述:SEMICONDUCTOR ((NW)) |
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