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  Richtek Technology Electronic Components Datasheet  

RT9277A Datasheet

Low Noise Boost Converter

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RT9277A/B
High Performance, Low Noise Boost Converter
General Description
The RT9277A/B is a high performance, low noise, fixed
frequency step up DC-DC Converter. The RT9277A/B
converters input voltage ranging 2.5V to 5.5V into output
voltage up to 16V. Current mode control with external
compensation network makes it easy to stabilize the
system and keep maximum flexibility. Soft start function
minimizes impact on the input power system. Internal power
MOSFET with very low RDS(ON) provides high efficiency.
The RT9277A/B automatically transits from PWM to PSM
(Pulse Skipping Mode) during light load condition further
increasing efficiency. 640kHz and 1.2MHz operation
frequency options provide flexibiltity of minimum output
inductor size, maximum efficiency and low BOM cost.
The RT9277A/B also provides comprehensive protection
functions such as UVLO, OCP and OTP.
Features
z 90% Efficiency
z VIN Operating Range : 2.5V to 5.5V
z 1.6A, 0.2Ω, 16V Internal Power MOSFET
z 640kHz and 1.2MHz Operation Frequency
z External Compensation Network
z Internal/External Programmable Soft Start Function
z Small MSOP8 Package
z OCP and OTP Function are Included
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z TFT LCD panel
z OLEDDisplay
z PCMCIA Cards
z Portable Device
Ordering Information
RT9277A/B
Package Type
F : MSOP-8
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
Soft Start Function
A : Internal
B : External Programmable
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)
COMP
FB
EN
GND
18
27
36
45
RT9277A
COMP
FB
EN
GND
18
27
36
45
RT9277B
Marking Information
MSOP-8
For marking information, contact our sales representative
directly or through a RichTek distributor located in your
area.
NC
FREQ
VIN
LX
SS
FREQ
VIN
LX
DS9277A/B-04 April 2011
www.richtek.com
1


  Richtek Technology Electronic Components Datasheet  

RT9277A Datasheet

Low Noise Boost Converter

No Preview Available !

RT9277A/B
Typical Application Circuit
VIN
2.5V to 5.5V
C1
L1
Chip Enable
D1
5 LX
GND 4
6 VIN
EN 3
7 FREQ FB 2
8 NC COMP 1
C2
R3
RT9277A
C4 C3
VOUT
R1
R2
VIN
2.5V to 5.5V
C1
Figure 1
Chip Enable
L1 D1
5 LX
GND 4
6 VIN
EN 3
7 FREQ FB 2
8 SS COMP 1
C2
R3
CSS RT9277B
C4 C3
VOUT
R1
R2
Figure 2
Symbol
(unit)
Application 1
Application 2
Application 3
Table 1. Component Selection
VIN VOUT FOSC C1
(V) (V) (Hz) (uF)
L1
(uH)
C2
(uF)
R3 C3 C4
(k) (pF) (pF)
3.3 9 1.2M 10 4.7(TDK SLF6028) 33 (ceramic) 82 820 10
3.3 12 1.2M 10 4.7(TDK SLF6028) 33 (ceramic) 180 680 22
3.3 12 640K 10 10(TDK SLF6028) 33 (ceramic) 120 1200 22
Function Block Diagram
www.richtek.com
2
EN
COMP
FB
FREQ
LX
VIN Protection
VFB
Internal
Soft-Start
1.24V
Error
Amplifier
-
+
Summing
Comparator
-
+
5uA
Oscillator
Slope
Compen-
sation
Clock
Control
and
Driver
Logic
Current
Sense
RT9277A
N
VIN
LX
GND
DS9277A/B-04 April 2011


Part Number RT9277A
Description Low Noise Boost Converter
Maker Richtek
PDF Download

RT9277A Datasheet PDF






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