AIC1899 Datasheet, PDF (1/10 Pages) Analog Intergrations Corporation – 1.0MHz Current-Mode Step-Up DC/DC Converter

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.
APPLICATIONS
OLED Driver for MP3 Player
White LED Backlight
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.
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.
TYPICAL APPLICATION CIRCUIT
L1 22uH
Vin=3V
+
Cin
33uF/6.3V
U1 AIC1899
IN
LX
SHDN FB
SS GND
C2
33nF
D1 SS0540
15V/15mA
R1
11k
Cout ⁺
10uF/25V
Co
0.1uF
R2 ^{CF 1nF}
1k
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: [phone]
FAX: [phone] www.analog.com.tw
DS-1899G-01 121208
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