参数资料
| 型号： | MC34268D |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/6页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 800MA 2.85V 8SOIC |
| 产品变化通告： | Product Discontinuation 27/Jun/2007 |
| 标准包装： | 98 |
| 应用： | 转换器，SCSI-2 |
| 输入电压： | 15V |
| 输出数： | 1 |
| 输出电压： | 2.85V |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 其它名称： | MC34268DOS |
MC34268
5.0V
V in
MC34268
SCSI
V O
110 W
1N5819
10
Regulator
GN
D
C O
10
To SCSI Bus
Figure 3. Typical SCSI Application
Figure 3 is a circuit of a typical SCSI terminator
application. The MC34268 is designed specifically to
provide 2.85 V required to drive a SCSI ? 2 bus. The output
current capability of the regulator is in excess of 800 mA;
enough to drive standard SCSI ? 2, fast SCSI ? 2, and some
wide SCSI ? 2 applications. The typical dropout voltage is
less than 1.0 V, allowing the IC to regulate to input voltages
less than 4.0 V. Internal protective features include current
and thermal limiting.
180
P.C. Board Heatsink Example
The MC34268 requires an external 10 m F capacitor with
an ESR of less than 10 W for stability over temperature.
With economical electrolytic capacitors, cold temperature
operation can pose a stability problem. As temperature
decreases, the capacitance also decreases and the ESR
increases, which could cause the circuit to oscillate.
Tantalum capacitors may be a better choice if small size is
a requirement. Also, the capacitance and ESR of a tantalum
capacitor is more stable over temperature.
90
P.C. Board Heatsink Example
160
L
2.0 oz
Copper
80
L
2.0 oz
Copper
120
L
9.0 mm
L
70
L
80
40
60
50
0
0
10
20 30 40 50
60
70
40
0
10
20 30
40
L, LENGTH OF COPPER FLAGS (mm)
Figure 4. SOIC ? 8 Thermal Resistance versus
P.C.B. Copper Length
ORDERING INFORMATION
L, LENGTH OF COPPER (mm)
Figure 5. DPAK ? 3 Thermal Resistance
versus P.C.B. Copper Length
Device
MC34268D
MC34268DG
MC34268DR2
MC34268DR2G
MC34268DT
MC34268DTG
MC34268DTRK
MC34268DTRKG
MC34268STT3
Package
SOIC ? 8
SOIC ? 8
(Pb ? Free)
SOIC ? 8
SOIC ? 8
(Pb ? Free)
DPAK ? 3
DPAK ? 3
(Pb ? Free)
DPAK ? 3
DPAK ? 3
(Pb ? Free)
SOT ? 223
Shipping Information ?
98 Units / Rail
98 Units / Rail
2500 Units / Tape & Reel
2500 Units / Tape & Reel
75 Units / Rail
75 Units / Rail
2500 Units / Tape & Reel
2500 Units / Tape & Reel
4000 Units / Tape & Reel
?For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging
Specifications Brochure, BRD8011/D.
http://onsemi.com
3
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MC34268DG | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-3 Active Terminator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC34268DR2 | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-4 RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC34268DR2G | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-5 Active Terminator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC34268DT | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-6 RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MC34268DTG | 功能描述:低压差稳压器 - LDO 2.85V 800mA SCSI-7 Active Terminator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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