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RT7257DLZSP 数据手册 - Richtek（立锜）
制造商:
Richtek（立锜）
分类:
稳压芯片
封装:
SOP-8
描述:
RICHTEK RT7257DLZSP 直流-直流开关降压(逐步递减)稳压器, 可调, 4.5V-18V输入, 800mV-12V输出, 3A输出, SOP-8
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RT7257DLZSP数据手册
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RT7257D
4
DS7257D-04 September 2012www.richtek.com
©
Copyright 2012 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Electrical Characteristics
(V
IN
= 12V, T
A
= 25°C, unless otherwise specified)
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------- −0.3V to 20V
Switch Voltage, SW ------------------------------------------------------------------------------------------------ −0.3V to (V
IN
+ 0.3V)
V
BOOT
− V
SW
---------------------------------------------------------------------------------------------------------- −0.3V to 6V
Other Pins Voltage -------------------------------------------------------------------------------------------------- −0.3V to 20V
Power Dissipation, P
D
@ T
A
= 25°C
SOP-8 (Exposed Pad) --------------------------------------------------------------------------------------------- 1.333W
Package Thermal Resistance (Note 2)
SOP-8 (Exposed Pad), θ
JA
---------------------------------------------------------------------------------------- 75°C/W
SOP-8 (Exposed Pad), θ
JC
--------------------------------------------------------------------------------------- 15°C/W
Lead Temperature (Soldering, 10 sec.)------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model)---------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------- 4.5V to 18V
Junction Temperature Range -------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range-------------------------------------------------------------------------------------- −40°C to 85°C
Parameter Symbol Test Conditions Min Typ Max Unit
Shutdown Supply Current V
EN
= 0V -- 0.5 3 μA
Supply Current V
EN
= 3V, V
FB
= 0.9V -- 0.8 1.2 mA
Reference Voltage V
REF
4.5V ≤ V
IN
≤ 18V 0.788 0.8 0.812 V
Error Amplifier
Transconductance
G
EA
ΔI
C
= ±10μA -- 940 -- μA/V
High Side Switch
On-Resistance
R
DS(ON)1
-- 110 -- mΩ
Low Side Switch
On-Resistance
R
DS(ON)2
-- 90 -- mΩ
High Side Switch Leakage
Current
V
EN
= 0V, V
SW
= 0V -- 0 10 μA
Upper Switch Current Limit Min. Duty Cycle, V
BOOT
− V
SW
= 4.8V -- 5.1 -- A
COMP to Current Sense
Transconductance
G
CS
-- 4.7 -- A/V
Oscillation Frequency f
OSC1
1 1.2 1.4 MHz
Short Circuit Oscillation
Frequency
f
OSC2
V
FB
= 0V -- 270 -- kHz
Maximum Duty Cycle D
MAX
V
FB
= 0.7V -- 78 -- %
Minimum On Time t
ON
-- 100 -- ns
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