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RT7280 데이터시트(PDF) 10 Page - Richtek Technology Corporation

부품명 RT7280
상세설명  2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter
PDF  22 Pages
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제조업체  RICHTEK [Richtek Technology Corporation]
홈페이지  http://www.richtek.com
Logo RICHTEK - Richtek Technology Corporation

RT7280 데이터시트(HTML) 10 Page - Richtek Technology Corporation

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RT7274/79/80/81
10
DS7274/79/80/81-01 February 2013
www.richtek.com
©
Copyright 2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
Note 1.
Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in
the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may
affect device reliability.
Note 2.
θJA is measured at TA = 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
measured at the exposed pad of the package. The PCB copper area of exposed pad is 70mm2.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
VPVCC Output
VPVCC Output Voltage
VPVCC
6V
≤ VIN ≤ 18V, 0 < IPVCC < 5mA
4.7
5.1
5.5
V
Line Regulation
6V
≤ VIN ≤ 18V, IPVCC = 5mA
--
--
20
mV
Load Regulation
0
< IPVCC < 5mA
--
--
100
mV
Output Current
IPVCC
VIN = 6V, VPVCC = 4V
--
110
--
mA
RDS(ON)
High Side
RDS(ON) _H
--
150
--
Switch On
Resistance
Low Side
RDS(ON) _L
--
105
--
m
Ω
Current Limit
Current Limit
ILIM
LSW = 2μH
2.5
3.5
4.7
A
Thermal Shutdown
Thermal Shutdown Threshold TSD
--
150
--
°C
Thermal Shutdown
Hysteresis
ΔTSD
--
25
--
°C
On-Time Timer Control
On-Time
tON
VIN = 12V, VOUT = 1.05V
--
145
--
ns
Minimum Off-Time
tOFF(MIN)
--
230
--
ns
Soft-Start
SS Charge Current
VSS = 0V
1.4
2
2.6
μA
SS Discharge Current
VSS = 0.5V
0.05
0.1
--
mA
UVLO
Wake up VPVCC
3.55
3.85
4.15
UVLO Threshold
Hysteresis
--
0.3
--
V
Power Good (RT7279/80)
FB Rising
85
90
95
PGOOD Threshold
FB Falling
--
85
--
%
PGOOD Sink Current
PGOOD = 0.5V
--
5
--
mA
Output Under Voltage and Over Voltage Protection (RT7279/80)
OVP Trip Threshold
OVP Detect
115
120
125
%
OVP Delay Time
--
5
--
μs
UVP Detect
65
70
75
UVP Trip Threshold
Hysteresis
--
10
--
%
UVP Delay Time
--
250
--
μs



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