RT9262AGS RICHTEK [Richtek Technology Corporation], RT9262AGS Datasheet

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RT9262AGS

Manufacturer Part Number
RT9262AGS
Description
High Efficiency, Low Supply Current, Step-up DC/DC Converter
Manufacturer
RICHTEK [Richtek Technology Corporation]
Datasheet
High Efficiency, Low Supply Current, Step-up DC/DC Converter
General Description
The RT9262/A is a compact, high efficient, step-up
DC/DC converter with an adaptive current mode PWM
control loop, providing a stable and high efficient operation
over a wide range of load currents. It operates in both
continuous and discontinuous current modes in stable
waveforms without external compensation.
The low start-up input voltage below 1V makes
RT9262/A suitable for 1 to 4 battery cell applications
providing up to 400mA output current. The 550kHz high
switching rate minimized the size of external components.
Besides, the 17μA low quiescent current together with
high efficiency maintains long battery lifetime.
The 1.8V to 5V output voltage is set with 2 external
resistors. Both internal 2A switch and driver for driving
external power devices (NMOS or NPN) are provided.
A 300mA LDO is included in RT9262 to provide a
secondary low noise output as well as an output current
stop in the shutdown mode. Similarly, a 1.8V to 5V LDO
output voltage can be set with 2 external resistors. For
RT9262A, a low battery detector with 0.86V detection
voltage is included. RT9262/A are provided in SOP-8
packages.
Ordering Information
Note :
RichTek Pb-free and Green products are :
DS9262/A-11 March 2007
RT9262/A
RoHS compliant and compatible with the current require-
Suitable for use in SnPb or Pb-free soldering processes.
100%matte tin (Sn) plating.
ments of IPC/JEDEC J-STD-020.
Package Type
S : SOP-8
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
Include Low Battery Detector
Include LDO
cial Standard)
Preliminary
Pin Configurations
Features
Applications
1.0V Low Start-up Input Voltage
High Supply Capability to Deliver 3.3V 100mA with
1V Input Voltage
17μ μ μ μ μ A Quiescent (Switch-off) Supply Current
90% Efficiency
550kHz Fixed Switching Rate
Providing Flexibility for Using Internal and External
Power Switches
Built-in 300mA LDO, also for the Zero-Output-
Current Shutdown Mode (RT9262)
Boost DC-DC Integrating LDO for Up-Down
Regulation (RT9262)
Built-in 0.86V Voltage Detector (RT9262A)
8-Pin SOP Package
RoHS Compliant and 100% Lead (Pb)-Free
PDA
Portable Instrument
Wireless Equipment
DSC
LCD Back Bias Circuit
RF-Tags
LDO O
GND
GND
EXT
EXT
LBO
LFB
LBI
(TOP VIEW)
RT9262ACS
RT9262CS
2
3
4
2
3
4
SOP-8
8
7
6
5
8
7
6
5
RT9262/A
EN
LX
VDD
FB
EN
LX
VDD
FB
www.richtek.com
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RT9262AGS Summary of contents

Page 1

High Efficiency, Low Supply Current, Step-up DC/DC Converter General Description The RT9262 compact, high efficient, step-up DC/DC converter with an adaptive current mode PWM control loop, providing a stable and high efficient operation over a wide range of ...

Page 2

RT9262/A Typical Application Circuit OUT2 1.3M C6 10uF R3 680K Figure 1. RT9262 Typical Application for Portable Instruments below 400mA V IN Low Battery Warning Output (Open Collector) Figure 2. RT9262A Typical Application for Portable ...

Page 3

OUT2 1.3M C6 10uF R3 680K 100uF 2. OUT2 1.3M C6 10uF R3 680K Figure 5. High Voltage Application (Rm should be added when IL > 100mA) DS9262/A-11 March ...

Page 4

RT9262/A Functional Pin Description Pin No. Pin Name RT9262 RT9262A 1 1 GND 2 2 EXT 3 -- LFB 4 -- LDOO -- 3 LBO -- 4 LBI VDD ...

Page 5

VDD LBI LBO Q2 N MOS FB EN Absolute Maximum Ratings Supply Voltage ----------------------------------------------------------------------------------------------------- LX Pin Switch Voltage -------------------------------------------------------------------------------------------- LDO Output Voltage ---------------------------------------------------------------------------------------------- Other I/O Pin Voltages ------------------------------------------------------------------------------------------- LX Pin Switch Current -------------------------------------------------------------------------------------------- 2.5A EXT Pin Driver Current -------------------------------------------------------------------------------------------- 30mA ...

Page 6

RT9262/A Electrical Characteristics (V = 1.5V, VDD set to 3.3V, Load Current = Parameter Start-UP Voltage Operating VDD Range No Load Current Switch-off Current I (VDD) Shutdown Current Feedback ...

Page 7

Typical Operating Characteristics Efficiency 100 Refet to Application Circuit Figure 1 and Figure 3.3V 25°C OUT A 20 0.01 0 LOAD No Load Current 90 80 ...

Page 8

RT9262/A Applications Information Output Voltage Setting Referring to application circuits Figure 1 to Figuer 5 the output voltage of the switching regulator (V set with Equation (1). The LDO output voltage (V OUT2 with Equation (2 ...

Page 9

DS9262/A-11 March 2007 Preliminary First Layer RT9262/A Second Layer (Full GND Plane) RT9262/A www.richtek.com 9 ...

Page 10

RT9262/A Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com 10 Preliminary ...

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