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参数资料
| 型号： | MAX748ACPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 3.3V 0.5A 8DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 3.3V |
| 输入电压： | 3.3 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
3.3V, Step-Down,
Current-Mode PWM DC-DC Converters
Table 3. External Component Suppliers
Production Method
Surface Mount
High Performance/
Miniature Through-Hole
Through-Hole
Phone and FAX Numbers:
Sumida
CD105 series
Coiltronics
CTX series
Coilcraft
DT series
Sumida
RCH895 series
Renco
RL1284 series
Inductors
Capacitors
Matsuo
267 series
Sprague
595D/293D series
Sanyo
OS-CON series (very low ESR)
Nichicon
PL series (low ESR)
Coilcraft
Coiltronics
Matsuo
USA:
USA:
USA:
Japan:
(708) 639-6400,
(305) 781-8900,
(714) 969-2491,
(06) 332-0871
FAX: (708) 639-1469
FAX: (305) 782-4163
FAX: (714) 960-6492
Renco
Sanyo
Sprague Elec. Co.
Sumida
USA:
USA:
USA:
USA:
(516) 586-5566,
(0720) 70-1005,
(603) 224-1961,
(708) 956-0666,
FAX:
FAX:
FAX:
FAX:
(516) 586-5562
(0720) 70-1174
(603) 224-1430
(708) 956-0702
Nichicon
USA:
Japan:
(708) 843-7500,
(03) 3607-5111,
FAX: (708) 843-2798
FAX: (03) 3607-5428
Undervoltage Lockout
The undervoltage lockout feature monitors the supply
voltage at V+ and allows operation to start when V+
rises above 2.95V. When V+ falls, operation continues
until the supply voltage falls below 2.7V (typ). When an
undervoltage condition is detected, control logic turns
off the output power FET and discharges the SS capac-
itor to ground. This prevents partial turn-on of the power
MOSFET and avoids excessive power dissipation. The
control logic holds the output power FET off until the
supply voltage rises above approximately 2.95V, at
which time an SS cycle begins. When the input voltage
exceeds the undervoltage lockout threshold, switching
action will occur, but the output will not be regulated
until the input voltage exceeds 3.3V (no load). The
exact input voltage required for regulation depends on
load conditions (see the Output Voltage vs. Supply
Voltage graph in the Typical Operating Characteristics).
Shutdown Mode
The MAX748A/MAX763A are held in shutdown mode
by keeping SHDN at ground. In shutdown mode, the
output drops to 0V and the output power FET is held in
an off state. The internal reference also turns off, which
causes the SS capacitor to discharge. Typical supply
current in shutdown mode is 0.2μA. The actual design
limit for shutdown current is much less than the 100μA
specified in the Electrical Characteristics. However,
testing to tighter limits is prohibitive because the cur-
rent takes several seconds to settle to a final value. For
normal operation, connect SHDN to V+. Coming out of
shutdown mode initiates an SS cycle.
Continuous-/Discontinuous-
Conduction Modes
The input voltage, output voltage, load current, and
inductor value determine whether the IC operates in
continuous or discontinuous mode. As the inductor
value or load current decreases, or the input voltage
increases, the MAX748A/MAX763A tend to operate in
discontinuous-conduction mode (DCM). In DCM, the
inductor current slope is steep enough so it decays to
zero before the end of the transistor off-time. In contin-
uous-conduction mode (CCM), the inductor current
never decays to zero, which is typically more efficient
than DCM. CCM allows the MAX748A/MAX763A to
deliver maximum load current, and is also slightly less
noisy than DCM, because it doesn’t exhibit the ringing
that occurs when the inductor current reaches zero.
Internal Reference
The +1.23V bandgap reference supplies up to 100μA
at REF. A 1000pF bypass capacitor from REF to GND
is required.
Oscillator
The MAX748A/MAX763A’s internal oscillator is guaran-
teed to operate in the 159kHz to 212.5 kHz range over
temperature for V+ = 5V. Temperature stability over the
military temperature range is about 0.04%/°C.
8
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX748ACPA+ | 功能描述:直流/直流开关转换器 3.3V Step-Down DC/DC Converter 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 |
| MAX748ACWE | 功能描述:直流/直流开关转换器 3.3V Step-Down DC/DC Converter 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 |
| MAX748ACWE+ | 功能描述:直流/直流开关转换器 3.3V Step-Down DC/DC Converter 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 |
| MAX748ACWE+T | 功能描述:直流/直流开关转换器 3.3V Step-Down DC/DC Converter 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 |
| MAX748ACWE-T | 功能描述:直流/直流开关转换器 3.3V Step-Down DC/DC Converter 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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