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AIC2359 Datasheet دیتاشیت PDF دانلود

دیتاشیت - Analog Intergrations Corporation - Step-Down DC/DC Converter

شماره قطعه AIC2359
شرح مفصل Step-Down DC/DC Converter
تولید کننده Analog Intergrations Corporation 
آرم Analog Intergrations Corporation 


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AIC2359 شرح
AIC2359
1A Dual Synchronous Step-down DC/DC Converter
FEATURES
Dual 1A Output
2.5V to 5.5V Input Range
Accurate Reference 0.6V Provides Low Output
Voltages
Adjustable Output Voltage
Up to 95% Efficiency
Stable with Low ESR Output Ceramic Capaci-
tors
No Schottky Diode Required.
65µA Quiescent Current per Channel.
100% Duty Cycle in Low Dropout Operation.
1.5MHz Fixed-Frequency PWM Operation
APPLICATIONS
Digital Still Cameras
Cellular Phones
Wireless and DSL Modems
Notebook Chipset Supplies.
PDAs and Handy-Terminals.
Battery-Operated Devices (1 Li-Ion or 3 NiMH/
NiCd).
DESCRIPTION
The AIC2359 is a dual output, low-noise,
pulse-width-modulated (PWM), DC-DC step-
down converter. It powers logic and transmit-
ters in small wireless systems such as cellular
phones, communicating PDAs, and handy-
terminals.
The device features an internal synchronous
rectifier for high efficiency; it requires no exter-
nal Schottky diode. Internally fixed-frequency
1.5MHz operation provides easy post-filtering
and allows the use of small inductors and ca-
pacitors. The AIC2359 is ideally suited for Li-
Ion battery applications. PWM/PSM mode ex-
tends battery life by switching to a pulse-
skipping-modulated mode during light loads.
Shutdown mode places the device in standby,
reducing supply current to under 1µA..
Other features of the AIC2359 include high ef-
ficiency, soft start, over temperature protection,
and over current protection. It is available in a
space-saving
12-pin
DFN.
TYPICAL APPLICATIONS CIRCUIT
Vin2
Vout1
2.2uH
L2
R12
10uF
Cout1
1 VIN2
4.7uF
Cin2
2
LX2
3 GND
4 FB1
5 NC1
6
22pF R11
EN1
C11 AIC2359
EN2
NC2
FB2
GND
LX1
VIN1
2.2uH
L1
12
11
10
9
8
7
Vout2
10uF
Cout2
R21
22pF
C21
R22
4.7uH
Cin1
Vin1
Fig. 1 Adjustable Output Voltage Step-Down DC/DC 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
DS-2359G-02 20120209
www.analog.com.tw
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