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参数资料
| 型号： | MAX1763EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC 3.3V/ADJ 16QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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： | 1.5A |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QSOP |
1.5A, Low-Noise, 1MHz, Step-Up
DC-DC Converter
The output capacitance can be determined by the
function:
C OUT ≥ [ (V REF / V OUT ) ? G M ? G FS ? C G ? (R G ? 2) ]
OUT
and
C OUT ≥ 10 ? [ (V REF / [V OUT ? GBP]) ? G M ? G FS ? R G ]
MAX1763
FB
R1
where V REF is the 0.983V reference voltage, G M is the
10mS internal amplifier transconductance, G FS is the
external MOSFET transconductance, R G is the gate-
source resistor, and GBP is the gain-bandwidth prod-
R2
( V V - 1 ) , V
FB = 1.245V, R2 ≤ 30k
uct of the internal gain block, 63Mrad/s.
___________________Design Procedure
R1 = R2
OUT
FB
Setting the Output Voltage
For a fixed 3.3V output, connect FB to GND. To set the
Figure 6. Connecting Resistors for External Feedback
output voltage between 2.5V and 5.5V, connect a resis-
tor voltage-divider to FB from OUT to GND (Figure 6).
The input bias current into FB is less than 100nA, allow-
ing 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 30k Ω or less, then calculate R1 using:
R1 = R2((V OUT / V FB ) - 1)
where V FB , the boost-regulator feedback set point, is
1.245V.
0.22 μ F
R SS
C SS
REF
ISET
MAX1763
I LIM = 2.5A
t SS = R SS C SS
Setting the Switch Current Limit
and Soft-Start
The ISET pin adjusts the inductor peak current and can
Figure 7. Soft-Start with Maximum Switch Limit Current
also be used to implement soft-start. With ISET con-
nected to REF, the inductor current limits at 2.5A. With
ISET connected to a resistive divider set from REF to
GND, the current limit is reduced according to:
I LIM = 2.5(V ISET / 1.25) [A]
0.22 μ F
R SS1
REF
ISET
MAX1763
( R
I LIM = 2.5A
Implement soft-start by placing a resistor from ISET to
REF (>300k Ω ) and a capacitor from ISET to GND. In
shutdown, ISET is discharged to GND through an inter-
nal 100k Ω resistor. As the capacitor voltage rises, the
output current is allowed to increase, and the output
R SS2
C SS
R SS2
SS1 + R SS2
t SS = (R SS1 R SS2 ) C SS
)
voltage rises. The speed at which the output rises is
determined by the soft-start time constant:
Figure 8. Soft-Start with Reduced Switch Limit Current
where R SS ≥ 300k.
t SS = R SS C SS
has excellent efficiency, most applications are well
served by the QSOP package. If the application
requires high power dissipation, or operation in a high
Both features may be implemented simultaneously by
placing a capacitor across the lower resistor of the cur-
rent-limiting resistive divider (Figures 7 and 8).
Package Selection
The MAX1763 is available in two packages, a 16-pin
QSOP and a 16-pin TSSOP-EP. Since the MAX1763
ambient temperature, choose the TSSOP-EP package.
The TSSOP-EP is equipped with an exposed metal pad
on its underside for soldering to grounded circuit board
copper. This reduces the junction-to-case thermal
resistance of the package from +115°C/W for QSOP to
+53°C/W for the TSSOP-EP.
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1763EUE | 功能描述:直流/直流开关转换器 1.5A 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 |
| MAX1763EUE+ | 功能描述:直流/直流开关转换器 1.5A 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 |
| MAX1763EUE+T | 功能描述:直流/直流开关转换器 1.5A 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 |
| MAX1763EUE+TG069 | 制造商:Maxim Integrated Products 功能描述: |
| MAX1763EUE-T | 功能描述:直流/直流开关转换器 1.5A 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 |
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