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부품번호 | RT8250N 기능 |
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기능 | 340kHz Synchronous Step-Down Converter | ||
제조업체 | Richtek | ||
로고 | |||
전체 12 페이지수
RT8250N
3A, 23V, 340kHz Synchronous Step-Down Converter
General Description
The RT8250N is a high-efficiency synchronous step-down
DC/DC converter that can deliver up to 3A output current
from 4.75V to 23V input supply. The RT8250N's current
mode architecture and external compensation allow the
transient response to be optimized over a wide range of
loads and output capacitors. Cycle-by-cycle current limit
provides protection against shorted outputs and soft-start
eliminates input current surge during start-up. The RT8250N
also provides output under voltage protection and thermal
shutdown protection. The low current (<3μA) shutdown
mode provides output disconnection, enabling easy power
management in battery-powered systems.
Applications
z Industrial and Commercial Low Power Systems
z Computer Peripherals
z LCD Monitors and TVs
z Green Electronics/Appliances
z Point of Load Regulation of High-Performance DSPs,
FPGAs and ASICs.
Pin Configurations
(TOP VIEW)
BOOT
VIN
SW
GND
8
27
GND
36
9
45
SS
EN
COMP
FB
Features
z 4.75V to 23V Input Voltage Range
z 3A Output Current
z Integrated N-MOSFET Switches
z Current Mode Control
z Fixed Frequency Operation : 340kHz
z Output Adjustable from 0.925V to 20V
z Up to 95% Efficiency
z Programmable Soft-Start
z Stable with Low-ESR Ceramic Output Capacitors
z Cycle-by-Cycle Over Current Protection
z Input Under Voltage Lockout
z Output Under Voltage Protection
z Thermal Shutdown Protection
z Thermally Enhanced SOP-8 (Exposed Pad) Package
z RoHS Compliant and Halogen Free
Ordering Information
RT8250N
Package Type
SP : SOP-8 (Exposed Pad-Option 1)
Operating Temperature Range
G : Green (Halogen Free with Commer-
cial Standard)
Note :
Richtek Green products are :
` RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
` Suitable for use in SnPb or Pb-free soldering processes.
SOP-8 (Exposed Pad)
Typical Application Circuit
VIN
4.75V to 23V
REN
100k
2 VIN
CIN
10µFx2
7 EN
BOOT 1
RT8250N
SW 3
8 SS
CSS
0.1uF
4,
Exposed Pad(9)
GND
FB 5
COMP 6
CBOOT L1
10nF 10µH
CC
3.9nF
RC
6.8k
R1
26.1k
R2
10k
VOUT
3.3V/3A
COUT
22µFx2
CP
NC
DS8250N-01 November 2009
www.richtek.com
1
RT8250N
Electrical Characteristics
(VIN = 12V, TA = 25°C unless otherwise specified)
Param eter
Symbol
Test Conditions
Shutdown Supply Current
Supply Current
Feedback Voltage
Error Amplifier Transconductance
High-Side Switch On-Resistance
Low-Side Switch On-Resistance
High-Side Switch Leakage Current
Upper Switch Current Limit
Lower Switch Current Limit
COMP to Current Sense
Trans co nduc tan ce
Oscillation Frequency
Short Circuit Oscillation Frequency
Maximum Duty Cycle
Minimum On Time
EN Logic-High Voltage
Threshold Logic-Low Voltage
Input Under Voltage Lockout
Thres ho ld
Input Under Voltage Lockout
Threshold H ysterisis
Soft-Start Current
Soft-Start Period
Thermal Shutdown
V FB
GEA
RDS(ON)1
RDS(ON)2
GCS
fOSC1
fOSC2
DMAX
tON
V IH
VIL
TSD
VEN = 0V
VEN = 3 V, VFB = 1.0V
4.75V ≤ VIN ≤ 23V
ΔIC = ±10μA
VEN = 0V, VSW = 0V
Min. Duty Cycle
VBOOT – VSW =4.8V
From Drain to Source
VFB = 0V
VFB = 0.8V
VIN Rising
VSS = 0V
CSS = 0.1μF
M in
--
--
0. 900
--
--
--
--
Typ
0.3
0.7
0 .925
125 0
10 0
85
0
Max Units
3 μA
1.2 mA
0.950 V
-- μA/V
-- mΩ
-- mΩ
10 μA
-- 5.5 --
A
-- 1.4 --
A
-- 5.2 -- A/V
300 340 380 kHz
-- 110 -- kHz
-- 90 -- %
-- 200 -- ns
2.7 -- -- V
-- -- 0.4 V
3.8 4.2 4.5
V
-- 200 -- mV
-- 7 -- μA
-- 13 -- ms
-- 150 -- °C
Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for
stress ratings. 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 for extended
periods may remain possibility to affect device reliability.
Note 2. Devices are ESD sensitive. Handling precaution is recommended.
Note 3. The device is not guaranteed to function outside its operating conditions.
Note 4. θJA is measured in the natural convection at TA = 25°C on a high effective four layers thermal conductivity test board of
JEDEC 51-7 thermal measurement standard. The case position of θJA is on the exposed pad of the package.
www.richtek.com
4
To be continued
DS8250N-01 November 2009
4페이지 RT8250N
VOUT
(200mV/Div)
Load Transient Response
VOUT
(200mV/Div)
Load Transient Response
IOUT
(2A/Div)
VIN = 12V, VOUT = 3.3V, IOUT = 0A to 1.5A
Time (100μs/Div)
IOUT
(2A/Div)
VIN = 12V, VOUT = 3.3V, IOUT = 0A to 3A
Time (100μs/Div)
DS8250N-01 November 2009
www.richtek.com
7
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부품번호 | 상세설명 및 기능 | 제조사 |
RT8250 | 340kHz Synchronous Step-Down Converter | Richtek |
RT8250N | 340kHz Synchronous Step-Down Converter | Richtek |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |