AIC1642
3-Pin One-Cell Step-Up DC/DC Converter
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: 2.2V, 2.7V, 2.8V, 3.0V,
3.1V, 3.3V, 3.7V, 4.5V and 5V.
Space Saving Packages: SOT-89, TO-92 (3 pin)
and SOT-23 (3 & 5 pin).
DESCRIPTION
The AIC1642 is a high efficiency step-up DC/DC
converter for applications using 1 to 4 NiMH bat-
tery cells. Only three external components are re-
quired to deliver a fixed output voltage of 2.2V,
2.7V, 2.8V, 3.0V, 3.1V, 3.3V, 3.7V, 4.5V or 5V.
The AIC1642 starts up from less than 0.9V input
with 1mA load. Pulse Frequency Modulation
scheme brings optimized performance for applica-
tions with light output loading and low input volt-
ages. The output ripple and noise are lower com-
pared with the circuits operating in PSM mode.
APPLICATIONS
Pagers.
Cameras.
Wireless Microphones.
Pocket Organizers.
Battery Backup Suppliers.
Portable Instruments.
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 AIC1642 an
ideal choice of DC/DC converter for space con-
scious applications, like pagers, electronic cam-
eras, and wireless microphones.
■
TYPICAL APPLICATION CIRCUIT
V
IN
L1
100μH
D1
GS SS12
V
OUT
V
IN
L1
100μH
+
C1
22μF SW
EN
D1
GS SS12
V
OUT
AIC1642
VOUT
+ C2
47μF
AIC1642
+
C1
SW
22μF
GND
VOUT
+ C2
47μF
ENABLE
GND
One Cell Step-Up DC/DC Converter
One Cell Step-Up DC/DC Converter with Enable Control
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-1642G-05 20101029
1
AIC1642
■
ABSOLUATE MAXIMUM RATINGS
Supply Voltage (VOUT pin)
SW pin Voltage
SW pin Switch Current
EN pin Voltage
Operating Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering 10 Sec.)
Thermal Resistance Junction to Case
TO-92
SOT-23
SOT-23-5
SOT-89
Thermal Resistance Junction to Ambient
TO-92
SOT-23-5
SOT-89
(Assume no ambient airflow, no heatsink) SOT-23
6V
6V
0.6A
6V
-40°C to 85°C
125°C
-65°C to 150
°C
260°C
120°C/W
115°C/W
115°C/W
45°C/W
150°C/W
250°C/W
250°C/W
160°C/W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
■
TEST CIRCUIT
V
IN
I
IN
L1
100μH
D1
SS12
V
OUT
IS
AIC1642
VOUT
GND
SW
VSW
AIC1642
+ C2
22μF SW
GND
VOUT
+ C1
47μF
VS
Fig. 1 Test Circuit 1
Fig. 2 Test Circuit 2
AIC1642
100
V
S
VOUT
GND
SW
F
OSC
Fig. 3 Test Circuit 3
4
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