DC/DC Converter. RT9266B Datasheet

RT9266B Converter. Datasheet pdf. Equivalent

RT9266B Datasheet
Recommendation RT9266B Datasheet
Part RT9266B
Description Step-Up DC/DC Converter
Feature RT9266B; RT9266B Tiny Package, High Efficiency, Step-Up DC/DC Converter General Description The RT9266B is .
Manufacture Richtek
Datasheet
Download RT9266B Datasheet




Richtek RT9266B
RT9266B
Tiny Package, High Efficiency, Step-Up DC/DC Converter
General Description
The RT9266B is a compact, high efficiency, and low
voltage step-up DC/DC converter with an Adaptive
Current Mode PWM control loop, includes an error
amplifier, ramp generator, comparator, switch pass
element and driver in which providing a stable and high
efficient operation over a wide range of load currents. It
operates in stable waveforms without external
compensation.
The low start-up input voltage below 1V makes RT9266B
suitable for 1 to 4 battery cells applications with a 500mA
internal switch. The 550kHz high switching rate minimized
the size of external components. Besides, the 25μA low
quiescent current together with high efficiency maintains
long battery lifetime.
Ordering Information
RT9266B
Package Type
E : SOT-23-6
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Note :
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.
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Features
z 1V Low Start-up Input Voltage at 1mA Load
z 25μA Quiescent (Switch-off) Supply Current
z Zero Shutdown Mode Supply Current
z 90% Efficiency
z 550kHz Switching Frequency at 3.3V VDD
z Providing Flexibility for Using Internal and External
Power Switches
z Small SOT-23-6 Package
z RoHS Compliant and 100% Lead (Pb)-Free
Applications
z PDA
z DSC
z LCD Panel
z RF-Tags
z MP3
z Portable Instrument
z Wireless Equipment
Pin Configurations
(TOP VIEW)
FB VDD LX
654
23
EN EXT GND
SOT-23-6
DS9266B-11 April 2011
www.richtek.com
1



Richtek RT9266B
RT9266B
Typical Application Circuit
L1 D1
VIN C3 3.3 to 10 uH
10uF
SS0520
VOUT
C2 3.3V/5V
1uF
VDD
EN RT9266B LX
R1
1.6M/3M
EXT GND
FB
R2
980k/1M
C1
10uF
Figure 1. RT9266B Typical Application for Portable Instruments
L1 D1
VIN
C3 3.3 to 10 uH
10uF
SS0520
VOUT
3.3V/5V
VDD LX
EN RT9266B EXT
GND FB
C2
1uF
R1
1.6M/3M
Q1
N MOS
R2
980k/1M
C1
10uF
Figure 2. RT9266B for Higher Current Applications
Test Circuit
I (VIN)
VIN A
C3
10uF
L1
10uH
A I (VDD)
VDD
EN RT9266B LX
EXT GND FB
D1
SS0520
VOUT
C2 3.3V/5V
1uF
R1 C4 C5
1.6M/3M 100p 10uF
R2
980k/1M
www.richtek.com
2
DS9266B-11 April 2011



Richtek RT9266B
Functional Pin Description
Pin Name Pin Function
EN Chip Enable (Active High)
EXT Output Pin for Driving External NMOS
GND
Ground
LX Pin for Switching
VDD
Input Positive Power Pin of RT9266B
FB Feedback Input Pin
Internal Reference Voltage for the Error Amplifier is 1.25V.
RT9266B
Function Block Diagram
VDD
FB
EN
RT9266B
1.25V
VDD
-
+
Loop Control Circuit
Q1
N MOS
R1
R2
Q3
N MOS
Over Temp.
Detector
Shut Down
EXT
LX1
GND
DS9266B-11 April 2011
www.richtek.com
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