RT9262ACS Richtek Technology Corporation, RT9262ACS Datasheet

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RT9262ACS

Manufacturer Part Number
RT9262ACS
Description
high efficiency, low supply current, step-up DC/DC converter
Manufacturer
Richtek Technology Corporation
Datasheet

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RT9262ACS
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RT9262ACS
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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
RT9262A
DS9262/A-05 October 2002
Operating temperature range
Package type
S : SOP-8
C: Commercial standard
A : Include low battery detector
Default : Include LDO
High Efficiency, Low Supply Current,
Preliminary
Features
Applications
Pin Configurations
Part Number
RT9262CS
(Plastic SOP-8)
RT9262ACS
(Plastic SOP-8)
1.0V Low Start-up Input Voltage
High Supply Capability to Deliver 3.3V 100mA
with 1V Input Voltage
17µA 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
PDA
Portable Instrument
Wireless Equipment
DSC
LCD Back Bias Circuit
RF-Tags
Step-up DC/DC Converter
LDOO
GND
GND
EXT
LFB
LBO
EXT
Pin Configurations
LBI
1
2
3
4
1
2
3
4
TOP VIEW
TOP VIEW
RT9262/A
www.richtek.com
8
7
6
5
8
7
6
5
CE
LX
VDD
FB
CE
LX
VDD
FB
1

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RT9262ACS Summary of contents

Page 1

... Regulation (RT9262) Built-in 0.86V Voltage Detector (RT9262A) 8-Pin SOP Package Applications PDA Portable Instrument Wireless Equipment DSC LCD Back Bias Circuit RF-Tags Pin Configurations Part Number RT9262CS (Plastic SOP-8) RT9262ACS (Plastic SOP-8) RT9262/A Pin Configurations TOP VIEW CE GND 1 8 EXT LFB ...

Page 2

... RT9262/A Marking Information Part Number Marking RT9262CS RT9262CS RT9262ACS RT9262ACS Typical Application Circuit OUT2 1. 10µF 680K Fig. 1 RT9262 Typical Application for Portable Instruments below 400mA V IN Low Battery Warning Output (Open Collector) Fig. 2 RT9262A Typical Application for Portable Instruments below 400mA www ...

Page 3

V IN Chip Enable Input 3.3V V OUT + 10µF Fig. 3 Application Circuit with Zero-Output-Current Shutdown Mode Control OUT2 1. 10µF 680K 100µF 2. OUT2 1.3M ...

Page 4

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

Page 5

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 Reference ...

Page 6

RT9262/A Function Block Diagram VDD Q2 PMOS LDOO LFB FB VDD CE VDD LBI LBO Q2 NMOS FB VDD CE www.richtek.com 6 Preliminary VDD RT9262 _ 0.86V _ Loop Control Circuit 1.25V R2 Shut Down Q3 Over Temp. NMOS Detector ...

Page 7

Typical Operating Charateristics Efficiency V OUT No Load Current Refer to Application Circuit Fig.1 and Fig 1.2 1.5 Input Voltage (V) Start Up Voltage 1 25°C A ...

Page 8

RT9262/A Application Note Output Voltage Setting Referring to application circuits Fig.1 to Fig.5, the output voltage of the switching regulator (V be set with Eq.1. The LDO output voltage (V OUT2 set with Eq. × V ...

Page 9

DS9262/A-05 October 2002 Preliminary First Layer RT9262/A Second Layer (Full GND Plane) RT9262/A www.richtek.com 9 ...

Page 10

RT9262/A Package Information J B Symbol www.richtek.com 10 Preliminary Dimensions In Millimeters Min Max 4.801 5.004 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1.346 0.178 0.254 ...

Page 11

DS9262/A-05 October 2002 Preliminary RT9262/A www.richtek.com 11 ...

Page 12

RT9262/A RICHTEK TECHNOLOGY CORP. Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com 12 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, ...

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