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参数资料
| 型号： | IRU1502-33CHTR |
| 厂商： | International Rectifier |
| 文件页数： | 9/11页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V 1A 6-MLPM |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 3V @ 1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1A |
| 电流 - 限制（最小）： | 1A |
| 工作温度： | 0°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-MLPM |
| 供应商设备封装： | 6-MLPM（3x3） |
| 包装： | 剪切带 (CT) |
| 其它名称： | *IRU1502-33CHTR IRU1502-33CHCT |
IRU1502-33
The thermal pad of MLPM is connected to a 1 inch square
copper through vias for a four layer PCB board design.
From the datasheet, this thermal junction-to-ambient re-
sistance is given as:
Θ JA =42 8 C/W
Where:
Θ JC ? 2.3 8 C
Θ CH ? 1 8 C
Θ HA ? 38.7 8 C
Layout Consideration
The IRU1502-33, like many other high-speed regulators,
requires that the output capacitors be close to the de-
vice for stability. For power consideration, a ground plane
pad of approximately one-inch square on the compo-
nent side must be dedicated to the device where all
ground pins are connected to dissipate the power. If a
multilayer board is used, it is recommended that the
inner layers of the board are also dedicated to the size
of the pad for better thermal characteristics.
For IRU1502-33, the thermal design needs to be con-
sider so that the resultant junction temperature is lower
than the maximum operating temperature, which is 125 8 C.
Therefore:
T J = Θ JA 3 P D +T A [ 125 8 C
Assuming, the following conditions:
V OUT = 3.3V
V IN = 5V
I OUT = 1A (DC Avg)
Calculate the maximum power dissipation using the fol-
lowing equation:
P D = I OUT 3 (V IN - V OUT )
P D = 1 3 (5 - 3.3) = 1.7W
For MLPM package, we have:
u JA = 42 8 C/W
T A = 45 8 C
D T = P D 3u JA = 1.7 3 42 = 71.4
T J = T A + D T = 116.4 8 C
IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105
TAC Fax: (310) 252-7903
Visit us at www.irf.com for sales contact information
Data and specifications subject to change without notice. 02/01
Rev. 1.0
07/17/03
www.irf.com
9
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