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Analog Intergrations Corporation

AIC1576 Datasheet Preview

AIC1576 Datasheet

Step-Down DC/DC Controller

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AIC1576
High-Efficiency, Step-Down DC/DC Controller
FEATURES
High Efficiency (up to 95%).
Low Quiescent Current at 90µA.
Pulse-Skipping and Pulse-Frequency
Modulation.
Inputs-Uncommitted Current Sense
Comparator.
Duty Cycle Adjustable.
90KHz to 280KHz Oscillator Frequency.
Power-Saving Shutdown Mode (8µA Typical).
Push-Pull Driver Output.
APPLICATIONS
LCD Monitors
Notebook Computers
Step-Down DC/DC Controller Module.
Constant Current Source for Battery
Chargers.
DESCRIPTION
The AIC1576 is a high performance step-down
DC/DC controller, designed to drive an external
P-channel MOSFET to generate programmable
output voltages. Two main schemes of
Pulse-Skipping and Pulse-Frequency
Modulation are employed to maintain low
quiescent current and high conversion efficiency
under wide ranges of input voltage and loading
condition. The AIC1576 delivers 10mA to 2A of
output current with 87%~93% efficiency at
VIN=9V, VOUT=5V condition. A current sense
comparator with both inverting and non-inverting
input uncommitted is included to provide the
crucial function of either current limit protection
or constant output current control. The efficiency
of AIC1576 is typically greater than 90%.
Quiescent current is about 90µA and can be
reduced to 8µA in shutdown mode. Switching
frequency being in around 90KHz to 280KHz
range, small size switching components are
ideal for battery powered portable equipment.
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-1576P-02 041806
1




Analog Intergrations Corporation

AIC1576 Datasheet Preview

AIC1576 Datasheet

Step-Down DC/DC Controller

No Preview Available !

AIC1576
TYPICAL APPLICATION CIRCUIT
VIN 6.4~18V
* RS
Q1
CEM4435
D1 L1 33µH
SS32
1 VIN
+
C1
100µF
C2
0.1µF VSHDN must be
2 NC
3 SHDN
NC 8
CS 7
DRI 6
C3 +
200µF
**R7
smaller than 15V 4 FB
GND 5
AIC1576
VOUT
5V
R1
12k
R2
3.9K
* RS should not be omitted so that inrush current won’t be too high.
IP
=
IO,MAX
+
VOUT(VIN VOUT)
2VIN × fS × L
RS
=
0.9 × VTH,MIN
IP
=
45mV
IP
=
0.09VINfSL
2VINfSLIO,MAX + VINVOUT
VO2UT
VIN: Input voltage
VOUT: Output voltage
fS: Working frequency
L= Inductor value
IO,MAX: Maximum Output current
VTH,MIN: Minimum Current Limit Sense Threshold
**VIN>15V, R7=15
VIN15V, R7=0
DC/DC Buck Converter
ORDERING INFORMATION
AIC1576XXXX
PACKING TYPE
TR: TAPE & REEL
TB: TUBE
PACKAGING TYPE
S: SMALL OUTLINE
N: PLASTIC DIP
C: Commercial
P: Lead Free Commercial
PIN CONFIGURATION
SO-8 / DIP-8
TOP VIEW
VIN 1
NC 2
SHDN 3
FB 4
8 NC
7 CS
6 DRI
5 GND
Exam ple:
AIC1576CSTR
in SO-8 Package & Taping & Reel Packing Type
(CN is not available in TR packing)
AIC1576PSTR
in SO-8 Lead Free Package & Taping & Reel
Packing Type
2


Part Number AIC1576
Description Step-Down DC/DC Controller
Maker Analog Intergrations Corporation
Total Page 14 Pages
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