900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




  Richtek Technology Electronic Components Datasheet  

RT2855A Datasheet

Synchronous Step-Down Converter

No Preview Available !

®
RT2855A/B
4A, 18V, 650kHz, ACOTTM Synchronous Step-Down Converter
General Description
The RT2855A/B are high-performance 650kHz 4A step-
down regulators with internal power switches and
synchronous rectifiers. They feature quick transient
response using their Advanced Constant On-Time
(ACOTTM) control architecture that provides stable
operation with small ceramic output capacitors and without
complicated external compensation, among other benefits.
The input voltage range is from 4.5V to 18V and the output
is adjustable from 0.765V to 7V.
The proprietary ACOTTM control improves upon other fast-
response constant on-time architectures, achieving nearly
constant switching frequency over line, load, and output
voltage ranges. Since there is no internal clock, response
to transients is nearly instantaneous and inductor current
can ramp quickly to maintain output regulation without
large bulk output capacitance. The RT2855A/B are stable
with and optimized for ceramic output capacitors
With internal 70mΩ switches and 30mΩ synchronous
rectifiers, the RT2855A/B display excellent efficiency and
good behavior across a range of applications, especially
for low output voltages and low duty cycles. Cycle-by-
cycle current limit, input under-voltage lock-out, externally-
adjustable soft-start, output under- and over-voltage
protection, and thermal shutdown provide safe and smooth
operation in all operating conditions.
The RT2855A and RT2855B are each available in
WQFN-16L 3x3 package, with exposed thermal pads. The
RT2855B switches continuously even at light loads to
avoid low-frequency interference while the RT2855A
features a power-saving discontinuous operating mode at
light loads.
Features
Fast Transient Response
Steady 650kHz Switching Frequency at all Load
Current (RT2855B)
Discontinuous operating mode at Light Load
(RT2855A)
4A Output Current
Advanced Constant On-Time (ACOTTM) Control
Optimized for Ceramic Output Capacitors
4.5V to 18V Input Voltage Range
Internal 70mΩ Switch and 30mΩ Synchronous
Rectifier
0.765V to 7V Adjustable Output Voltage
Externally-adjustable, Pre-biased Compatible Soft-
Start
Cycle-by-Cycle Current Limit
Optional Output Discharge Function
Output Over- and Under-voltage Shut-down
Latched (RT2855ALGQW/RT2855BLGQW Only)
Hiccup Mode (RT2855AHGQW/RT2855BHGQW
Only)
Input Under Voltage Lockout
Thermal Shutdown
Simplified Application Circuit
VIN
Power Good
VREG5
Input Signal
RT2855A/B
VIN SW
VCC
BOOT
PGOOD
VS
EN FB
SS VREG5
GND PGND
VOUT
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
DS2855A/B-01 September 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT2855A Datasheet

Synchronous Step-Down Converter

No Preview Available !

RT2855A/B
Applications
Industrial and Commercial Low Power Systems
Computer Peripherals
LCD Monitors and TVs
Green Electronics/Appliances
Point of Load Regulation for High-Performance DSPs,
FPGAs, and ASICs
Marking Information
RT2855AHGQW
4G= : Product Code
4G=YM
DNN
YMDNN : Date Code
RT2855ALGQW
4F=YM
DNN
4F= : Product Code
YMDNN : Date Code
Ordering Information
RT2855A/B
Package Type
QW : WQFN-16L 3x3 (W-Type)
Lead Plating System
G : Green (Halogen Free and Pb Free)
H : Hiccup Mode OVP & UVP
L : Latched OVP & UVP
Note :
A : PSM
B : PWM
Richtek 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.
Pin Configurations
(TOP VIEW)
RT2855BHGQW
4E=YM
DNN
4E= : Product Code
YMDNN : Date Code
16 15 14 13
FB
VREG5
SS
GND
1
2
3
4
GND
17
12 BOOT
11 SW
10 SW
9 SW
5 678
RT2855BLGQW
4D=YM
DNN
4D= : Product Code
YMDNN : Date Code
WQFN-16L 3x3
Copyright ©2015 Richtek Technology Corporation. All rights reserved.
www.richtek.com
2
is a registered trademark of Richtek Technology Corporation.
DS2855A/B-01 September 2015


Part Number RT2855A
Description Synchronous Step-Down Converter
Maker Richtek
Total Page 16 Pages
PDF Download

RT2855A Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 RT2855A Synchronous Step-Down Converter
Richtek
2 RT2855B Synchronous Step-Down Converter
Richtek





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy