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参数资料
| 型号： | HMC976LP3E |
| 厂商： | Hittite Microwave Corporation |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 4.8V/ADJ .4A 16QFN |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式或可调式 |
| 输出电压： | 4.8V，1.8 V ~ 5.1 V |
| 输入电压： | 3.3 V ~ 5.5 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 400mA（最小值） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-VQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | 1127-1080-6 |
HMC976LP3E
v02.1112
400mA LOW NOISE, HIGH PSRR
LINEAR VOLTAGE REGULATOR
Output Voltage Adjustment
The default output voltage is 4.8V this configuration “HMC976LP3E 4.8V User Application Schematic” .
The output voltage can be set to 5V by a ground on HV pin 5 “HMC976LP3E 5V User Application Schematic”.
The output voltage can be set from 1.8V to <4.8V by a resistor from pin 2 to the output pin 11 shown in
“HMC976LP3E 3.3V User Application Schematic”. The value of the resistor is given by the equation below.
? ? 1 ? * 18 . 9
? ? Vout ? ?
? 1 . 17 ?
R 1 = ?
1 ? 0 . 32 * ? ?
? ? 1 ?
??
?
? ? Vout ? ?
? ? 1 . 17 ? ?
(Kohms)
If the temperature stability performance similar to that shown in the plot “Vout=5V and Vref vs. Temperature” is
required, then any external resistor temperature coefficient is a critical parameter and should be better than 50ppm
and 1% tolerance. Please note that the temperature coefficient of the internal resistor feedback divider is 270ppm/°C.
Layout of PCB
The layout of the PCB should follow these guide lines, the PADDLE should be connected to ground with at least 5 vias
directly under the paddle to the bottom side ground plane. To ensure the noise and PSRR specifications are met,
the capacitors connecting to Pins 15, 11, 3 (see user application schematics), should be placed as close as possible
to the relevant pin and the ground connection should be as short as possible. Trace widths and via sizes should be
scaled to match the current drawn. The use of a large ground plane is recommended with a large number of ground
vias near the device to carry the ground.
Thermal Protection
The HMC976LP3E includes an integrated thermal protection circuit. If the junction temperature of the HMC976LP3E
reaches the maximum operating junction temperature (115°C max, 130°C typical) then the thermal protection circuit
temporarily disables the HMC976LP3E outputs (with ~500uA output current) until the junction temperature cools down
by approximately 10°C.
A typical reason for the increase of the junction temperature is an unexpected increase in current draw. By disabling
the outputs, the HMC976LP3E is in this case protecting the other devices on the PCB that it is supplying with current.
The thermal protection circuitry will also indirectly protect against a short circuit at the output. After the overload or the
fault condition is removed or changed, the regulator output returns to the nominal operation
For reliable long term operation the “Recommended Operating Condition” must be followed and the maximum junc-
tion temperature must not be exceeded. The junction temperature for a given dissipation can be calculated from the
T = T a + ?? P × θ ??
equation below:
j ?? d ja ??
? ?
? ?
? ?
Where Tj=Junction Temperature (°C), Ta=Ambient Temperature (°C), Pd=Dissipated Power (W) θ ja =Thermal
Resistivity Junction to Ambient (°C/W). Please refer to Table 2 for thermal resistance values.
For price, delivery and to place orders: Hittite Microwave Corporation, 2 Elizabeth Drive, Chelmsford, MA 01824
9
978-250-3343 tel ? 978-250-3373 fax ? Order On-line at www.hittite.com
Application Support: apps@hittite.com
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| HMC976LP3ETR | 制造商:Hittite Microwave Corp 功能描述:IC REG LDO 4.8V/ADJ 0.4A 16QFN 制造商:Hittite Microwave Corp 功能描述:HMC976 Series 400 mA 1.8 - 5.1 Vout Linear Voltage Regulator - 3x3 mm QFN-16 |
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