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.
Features
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
µ
90% Efficiency
550KHz Fixed Switching Rate
Providing Flexibility for Using Internal and
External Power Switches
SOT89-5 Package
Applications
PDA
Portable Instrument
DSC
Ordering Information
RT9263
Package type
X5 : SOT89-5
Operating temperature range
C: Commercial standard
C : Chip enable control
E : Driver for external power devices
Pin Configurations
Part Number
RT9263CCX5
(Plastic SOT89-5)
Pin Configurations
TOP VIEW
5
4
1
2
3
1.
2.
3.
4.
5.
1.
2.
3.
4.
5.
CE
VDD
FB
LX
GND
EXT
VDD
FB
LX
GND
RT9263ECX5
(Plastic SOT89-5)
TOP VIEW
5
4
Typical Application Circuit
1
2
3
V
IN
+
100pF
VDD
CE
RT9263CCX5
LX
GND
FB
R2
980K
D1
1N5819
C2
1µF
+
R1
1.6M
L1
4.7µH
100µF
3.3V
V
OUT1
C1
100µF
Fig. 1 RT9263CCX5 Typical Application for Portable Instruments below 400mA
DS9263-00 November 2001
www.richtek-ic.com.tw
1
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
