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| 型号： | HIP6501ACBZ-T |
| 厂商： | Intersil |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CONTROLLER 16SOIC |
| 标准包装： | 2,500 |
| 应用： | 电源控制器 |
| 电源电压： | 5V，12V |
| 电流 - 电源： | 20mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SOIC |
| 包装： | 带卷 (TR) |
HIP6501A
undergoes a new soft-start cycle and resumes normal
operation in accordance to the ATX supply and control pins
FAULT/MSEL
status.
Layout Considerations
R SEL
MEM VOLTAGE
SELECT COMP
The typical application employing a HIP6501A is a fairly
straight-forward implementation. Similar to any other linear
R SEL
V MEM
40 μ A
+
-
+
0.2V
-
regulators, attention has to be paid to a few potentially
sensitive small signal components, such as those connected
to high-impedance nodes or those supplying critical by-pass
currents.
1k ?
2.5V
10k ?
3.3V
+12V IN
+5V SB
FIGURE 11. 2.5/3.3V MEM OUTPUT VOLTAGE SELECTION
CIRCUITRY DETAILS
C 12V
12V
C 5VSB
5VSB
C IN
Application Guidelines
C SS
SS
5VDLSB
V OUT3
Q4
Soft-Start Interval
5VDL
DLA
The 5VSB output of a typical ATX supply is capable of
725mA. During power-up in a sleep state, it needs to provide
sufficient current to charge up all the output capacitors and
simultaneously provide some amount of current to the output
Q2
C HF1
V OUT1
3V3DLSB
HIP6501A
3V3DL
C BULK3
C HF3
Q5
loads. Drawing excessive amounts of current from the 5VSB
output of the ATX can lead to voltage collapse and induce a
pattern of consecutive restarts with unknown effects on the
system’s behavior or health.
The built-in soft-start circuitry allows tight control of the slew-
Q3
C BULK1
VSEN2
GND DRV2
+5V IN
V OUT2 C HF2
Q1 C BULK2
up speed of the output voltages controlled by the HIP6501A,
thus enabling power-ups free of supply drop-off events.
I COUT = -------------------------------- × Σ ( C OUT × V OUT ) , where
Since the outputs are ramped up in a linear fashion, the
current dedicated to charging the output capacitors can be
calculated with the following formula:
I SS
C SS × V BG
I SS - soft-start current (typically 10 μ A)
C SS - soft-start capacitor
V BG - bandgap voltage (typically 1.26V)
Σ ( C OUT xV OUT ) - sum of the products between the
capacitance and the voltage of an output.
Due to the various system timing events, it is recommended
that the soft-start interval not be set to exceed 30ms.
Additionally, the recommended soft-start capacitor range
spans from 5nF up to 0.22 μ F (0.1 μ F recommended).
Shutdown
In case of a FAULT condition that might endanger the
computer system, or at any other time, the HIP6501A can be
shut down by pulling the SS pin below the specified
shutdown level (typically 0.8V) with an open drain or open
collector device capable of sinking a minimum of 2mA.
Pulling the SS pin low effectively shuts down all the pass
elements. Upon release of the SS pin, the HIP6501A
10
+3.3V IN
KEY
ISLAND ON POWER PLANE LAYER
ISLAND ON CIRCUIT/POWER PLANE LAYER
VIA CONNECTION TO GROUND PLANE
FIGURE 12. PRINTED CIRCUIT BOARD ISLANDS
The power components (pass transistors) and the controller
IC should be placed first. The controller should be placed in
a central position on the motherboard, closer to the memory
load if possible. Ensure the VSEN2 connection is properly
sized to carry 200mA without significant resistive losses. The
pass transistors should be placed on pads capable of
heatsinking, matching the device’s power dissipation. Where
applicable, multiple via connections to a large internal plane
can significantly lower localized device temperature rise.
Placement of the decoupling and bulk capacitors should
follow a placement reflecting their purpose. As such, the
high-frequency decoupling capacitors (C HF ) should be
placed as close as possible to the load they are decoupling;
the ones decoupling the controller (C 12V , C 5VSB ) close to
the controller pins, the ones decoupling the load close to the
load connector or the load itself (if embedded). The bulk
FN4749.6
December 30, 2004
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相关代理商/技术参数 |
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|---|---|
| HIP6501AEVAL1 | 功能描述:电源管理IC开发工具 HIP6501A EVAL BRD FOR ACPI PWR MGT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
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