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AN-SY7152 데이터시트 PDF




Silergy에서 제조한 전자 부품 AN-SY7152은 전자 산업 및 응용 분야에서
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부품번호 AN-SY7152 기능
기능 High Efficiency 1MHz 2A Step Up Regulator
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AN-SY7152 데이터시트, 핀배열, 회로
Applications Note: AN_ SY7152
High Efficiency 1MHz, 2A Step Up Regulator
Preliminary Specification
General Description
The SY7152 is a high efficiency boost regulator
targeted for general step-up applications.
Ordering Information
SY7152 (□□)
Temperature Code
Package Code
Optional Spec Code
Temperature Range: -40°C to 85°C
Ordering Number Package type Note
SY7152ABC
SOT23-6
2A
Features
Wide input range: 3-8V bias input, 16Vout max
1MHz switching frequency
Minimum on time: 100ns typical
Minimum off time: 100ns typical
Low RDS(ON): 150m
RoHS Compliant and Halogen Free
Accurate Reference: 0.6VREF
Compact package: SOT23-6
Applications
WLED Drivers
Networking cards powered from PCI or PCI-
express slots
Typical Applications
Figure 1. Schematic Diagram
Figure 2. Efficiency vs Load Current
AN_SY7152 Rev.0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 1




AN-SY7152 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics
AN_SY7152
Load Transient
(VIN=5V, VOUT=12V,Iload=0.1~0.5A)
VOUT(AC)
(0.5V/div)
Io
(0.2A/div)
Time(100us/div)
AN_SY7152 Rev. 0.1 Silergy Corp. Confidential- Prepared for Internal Use Only 4

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AN-SY7152 전자부품, 판매, 대치품
The schottky diode reverse breakdown voltage should
be larger than the output voltage.
Applications with Large Bulk Capacitance
In applications with large bulk capacitance on the
output, a very high inrush current can be seen flow
through the inductor during power on. To avoid this
inrush current flow into the IC and cause any
unexpected damage, a Zener diode connected from
power input to the output or an RC delay circuit added
on EN pin of the IC can be used. Refer to the circuit
below.
Layout Design:
The layout design of SY7152 regulator is relatively
simple. For the best efficiency and minimum noise
AN_SY7152
problems, we should place the following components
close to the IC: CIN, L, R1 and R2.
1) It is desirable to maximize the PCB copper area
connecting to GND pin to achieve the best thermal and
noise performance. If the board space allowed, a
ground plane is highly desirable.
2) CIN must be close to Pins IN and GND. The loop
area formed by CIN and GND must be minimized.
3) The PCB copper area associated with LX pin must
be minimized to avoid the potential noise problem.
4) The components R1 and R2, and the trace
connecting to the FB pin must NOT be adjacent to the
LX net on the PCB layout to avoid the noise problem.
5) If the system chip interfacing with the EN pin has a
high impedance state at shutdown mode and the IN pin
is connected directly to a power source such as a Li-Ion
battery, it is desirable to add a pull down 1Mohm
resistor between the EN and GND pins to prevent the
noise from falsely turning on the regulator at shutdown
mode.
AN_SY7152 Rev. 0.1 Silergy Corp. Confidential- Prepared for Customer Use Only 7

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부품번호상세설명 및 기능제조사
AN-SY7152

High Efficiency 1MHz 2A Step Up Regulator

Silergy
Silergy

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