AIC1639
1-Cell, 3-Pin, Step-Up DC/DC Controller
FEATURES
A Guaranteed Start-Up from less than 0.9 V.
High Efficiency.
Low Quiescent Current.
Less Number of External Components needed.
Low Ripple and Low Noise.
Fixed Output Voltage: 2.7, 3.0V, 3.1V, 3.3V,
3.6V , 5V and 5.5V .
Driver for External Transistor.
Space Saving package: SOT-23, SOT-89 and
TO-92.
DESCRIPTION
The AIC1639 is a high efficiency step-up
DC/DC controller for applications using 1 to 4
battery cells. Only three external components
are required to deliver a fixed output voltage of
2.7, 3.0V, 3.1V, 3.3V, 3.6V , 5V or 5.5V. The
AIC1639 starts up from less than 0.9V input
with 1mA load. Pulse Frequency Modulation
scheme brings optimized performance for ap-
plications with light output loading and low input
voltages. The output ripple and noise are lower
compared with the circuits operating in PSM
mode.
The PFM control circuit operating in 100KHz
(max.) switching rate results in smaller passive
components. The space saving SOT-23, SOT-
89 and TO-92 packages make the AIC1639 an
ideal choice of DC/DC controller for space con-
scious applications, like pagers, electronic
cameras, and wireless microphones.
Provided with an external transistor driver pin
(EXT), the AIC1639 is recommended for appli-
cations requiring current as large as several
tens to several hundreds of milli-amperes.
APPLICATIONS
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
TYPICAL APPLICATION CIRCUIT
VIN
D1
L1
33µH
R1
V
OUT
GS SS14
+
C1
47µF
*Q1
2SD1803
300
EXT
AIC1639
VOUT
+
C3
100µF
C2
10nF
*Q1: Sanyo 25D1803S-TC 60V/5A/20W
GND
100mA Load Current Step-Up Converter
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-1639G-01 121608
1
AIC1639
ABSOLUATE MAXIMUM RATINGS
Supply Voltage (VOUT Pin) ……………….………………………………………………….6V
EXT pin Voltage …………………………………………………………….-0.3V to Vout+0.3V
EXT pin Current ………………………………………………………………………….± 50mA
Operating Temperature Range
Maximum Junction Temperature
……………………………………………….-40°C to 85°C
125°C
Storage Temperature Range ………………………………………………… -65°C to 150
°C
Lead Temperature (Soldering 10 Sec.) …………………………………………………260°C
Thermal Resistance Junction to Case
SOT-23
TO-92
SOT-89
Thermal Resistance Junction to Ambient
SOT-23
SOT-89
(Assume no ambient airflow, no heatsink) TO-92
130°C/W
120°C/W
30°C/W
180°C/W
150°C/W
160°C/W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
AIC1639
2.5V
VOUT
GND
EXT
F
OUT
Oscillator Test Circuit
4
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