AIC1899
1.0MHz Current-Mode Step-Up DC/DC Converter
FEATURES
Fixed Frequency 1.0MHz Current-Mode PWM
Operation.
Adjustable Output Voltage up to 24V.
2.5V to 5.5V Input Range.
Maximum 0.1µA Shutdown Current.
Programmable Soft-Start.
Tiny Inductor and Capacitors are allowed.
Space-Saving TSOT-23-6 and SOT-23-6
Package.
The high switching frequency allows the use of
small external components. The Soft-Start function
is programmable with an external capacitor, which
sets the input current ramp rate.
The AIC1899 is available in a space-saving
TSOT-23-6 and SOT-23-6 package.
DESCRIPTION
The current-mode pulse-width modulation, AIC1899,
step up converter is designed for MP3 player. The
built-in high voltage N-channel MOSFET allows
AIC1899 for step-up applications with up to 24V
output voltage, and other low-side switching DC/DC
converter.
APPLICATIONS
OLED Driver for MP3 Player
White LED Backlight
TYPICAL APPLICATION CIRCUIT
L1
22uH
Vin=3V
+
U1 AIC1899
IN
LX
D1
SS0540
+
15V/15mA
Cin
33uF/6.3V
SHDN FB
SS GND
R2
1k
R1
11k
Cout
10uF/25V
Co
0.1uF
CF 1nF
C2
33nF
Fig. 1
Typical Step up Application Circuit
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1899G-01
121208
1
AIC [ ANALOG INTERGRATIONS CORPORATION ]
