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参数资料
| 型号： | MAX1760EUB |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/14页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 3.3V/ADJ 10UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 升压（升压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 3.3V，2.5 V ~ 5.5 V |
| 输入电压： | 0.7 V ~ 5.5 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-µMAX |
0.8A, Low-Noise, 1MHz,
Step-Up DC-DC Converter
3.3 μ H
V IN = 2.4V
33 μ F
CLK/SEL
ON
LX
MAX1760
POUT
V OUT
ISET
REF
OUT
4.7 ?
100 μ F
(
)
0.22 μ F
PGND GND
FB
R1
R2
0.68 μ F
R1 = R2
VOUT
VFB
- 1
V FB = 1.24V
Figure 3. Connecting Resistors for External Feedback
(
0.22 μ F
R SS
REF
MAX1760
I LIM = 1.25A
t SS = R SS C SS
0.22 μ F
R SS1
REF
MAX1760
R SS2
I LIM = 1.25A
R SS1 + R SS2
t SS = ( R SS1 II R SS2 ) C SS
)
ISET
ISET
C SS
R SS2
C SS
I LIM = 1.25A ? ISET ?
R1 = R2 ? OUT ? 1 ?
R SS ≥ 470k ?
Figure 4. Soft-Start with Maximum Switch Limit Current
Reference
The MAX1760 has an internal 1.250V ±1% reference.
Connect a 0.22μF ceramic bypass capacitor from REF
to GND within 0.2in (5mm) of the REF pin. REF can
source up to 50μA of external load current.
Design Procedure
Setting the Output Voltages
For a fixed 3.3V output, connect FB to GND. To set
other output voltages between 2.5V and 5.5V, connect
a resistor voltage-divider to FB from OUT to GND
(Figure 3). The input bias current into FB is <20nA,
allowing large-value divider resistors without sacrificing
accuracy. Connect the resistor voltage-divider as close
to the IC as possible, within 0.2in (5mm) of FB. Choose
R2 of 270k ? or less, then calculate R1 using:
? V ?
? V FB ?
R SS1 ≥ 470k ?
Figure 5. Soft-Start with Reduced Switch Current Limit
where V FB , the boost-regulator feedback set point, is
1.24V.
Setting the Switch Current Limit
and Soft-Start
The ISET pin adjusts the inductor current limit and
implements soft-start. With ISET connected to REF, the
inductor current limits at 1.25A. With ISET connected to
a resistive divider set from REF to GND, the current limit
is reduced according to:
? V ?
? 1.25V ?
Implement soft-start by placing a resistor from ISET to
REF and a capacitor from ISET to GND. In shutdown,
ISET is discharged to GND through an on-chip 100k ?
resistor. At power-up, ISET is 0V and the LX current is
zero. As the capacitor voltage rises, the current
increases and the output voltage rises. The soft-start
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1760EUB+ | 功能描述:直流/直流开关转换器 0.8A Low-Noise 1MHz Step-Up 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 |
| MAX1760EUB+T | 功能描述:直流/直流开关转换器 0.8A Low-Noise 1MHz Step-Up 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 |
| MAX1760EUB-T | 功能描述:直流/直流开关转换器 0.8A Low-Noise 1MHz Step-Up 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 |
| MAX1760EVKIT | 功能描述:直流/直流开关转换器 Evaluation Kit for the MAX1760 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 |
| MAX1760HETB | 制造商:Maxim Integrated Products 功能描述:0.8A, LOW-NOISE, 1MHZ, STEP-UP DC-DC CONVERTE - Rail/Tube |
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