RT9263 Datasheet, PDF (1/10 Pages) Richtek Technology Corporation – HIGH EFFICIENCY LOW SUPPLY CURRENT STEP UP DC/DC CONVERTER

Preliminary
RT9263
High Efficiency, Low Supply Current,
Step-up DC/DC Converter
General Description
The RT9263 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
RT9263 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.
Ordering Information
RT9263… … ……
Package type
X5 : SOT89-5
Operating temperature range
C: Commercial standard
C : Chip enable control
E : Driver for external power devices
Typical Application Circuit
Features
z 1.0V Low Start-up Input Voltage
z High Supply Capability to Deliver 3.3V 100mA
with 1V Input Voltage
z 17µA Quiescent (Switch-off) Supply Current
z 90% Efficiency
z 550KHz Fixed Switching Rate
z Providing Flexibility for Using Internal and
External Power Switches
z SOT89-5 Package
Applications
z PDA
z Portable Instrument
z DSC
Pin Configurations
Part Number
RT9263CCX5
(Plastic SOT89-5)
RT9263ECX5
(Plastic SOT89-5)
Pin Configurations
TOP VIEW
5
4
123
1. CE
2. VDD
3. FB
4. LX
5. GND
5
4
123
TOP VIEW
1. EXT
2. VDD
3. FB
4. LX
5. GND
V_IN ⁺
VDD
CE RT9263CCX5 LX
GND
FB
100pF _R1
1.6M
L1
4.7µH
R2
980K
D1
1N5819
C2
1µF
100µF
3.3V
V_{OU T1}
C1
100µF
Fig. 1 RT9263CCX5 Typical Application for Portable Instruments below 400mA
DS9263-00 November 2001
www.richtek-ic.com.tw
1