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PDF IA3220 Datasheet ( Hoja de datos )

Número de pieza IA3220
Descripción 1.3A Synchronous Step-Down Converter
Fabricantes TGW 
Logotipo TGW Logotipo

Total 7 Páginas
		
IA3220 Hoja de datos, Descripción, Manual
FEATURES
High Efficiency: Up to 96%
1.5MHz Constant Frequency Operation
1300mA Output Current
No Schottky Diode Required
2.3V to 6V Input Voltage Range
Adjustable Output Voltage Range
Options from 0.6V to Vin
100% Duty Cycle Low Dropout Operation
Low Quiescent Current: 35µA
Slope Compensated Current Mode Control for
Excellent Line and Load Transient Response
Short Circuit Protection
Thermal Fault Protection
Inrush Current Limit and Soft Start
<1µA Shutdown Current
Tiny SOT23-5 Package
APPLICATIONS
Cellular and Smart Phones
Wireless and DSL Modems
PDAs
Digital Still and Video Cameras
MP3 Players
IA3220
1.5MHz, 1.3A Synchronous
Step-Down Converter
GENERAL DESCRIPTION
The IA3220 L are high-efficiency, high frequency
synchronous step-down DC-DC regulator ICs capable
of delivering up to 1.3A output currents. The IA3220
can operate over a wide input voltage range from 2.3V
to 6V and integrates main switch and synchronous
switch with very low RDS(ON) to minimize the
conduction loss.
It is ideal for powering portable equipment that runs
from a single cell Lithium-Ion (Li+) battery. The output
voltage can be regulated as low as 0.6V. The
IA3220 L can also run at 100% duty cycle for low
dropout operation, extending battery life in portable
system. This device offers two operation modes, PWM
mode and PFM Mode switching control, which allows
a high efficiency over the wider range of the load.
The IA3220 L is offered in a low profile (1mm) 5-pin,
thin SOT package, and is available in an adjustable
version.
TYPICAL APPLICATION
Figure 1. Typical Application Circuit
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IA3220 pdf
FUNCTIONAL BLOCK DIAGRAM
IA3220
Figure 2. IA32200 Block Diagram
FUNCTIONAL DESCRIPTION
IA3220 L is a synchronous buck regulator IC that
integrates the PWM/PFM control, high-side and
low-side MOSFETs on the same die to minimize the
switching transition loss and conduction loss. With
ultra low RDS(ON) power switches and proprietary
PWM control, this regulator IC can achieve the
highest efficiency and the highest switch frequency
simultaneously to minimize the external inductor and
capacitor size, and thus achieving the minimum
solution footprint.
The IA3220 L requires only three external power
components (Cin, Cout and L). The adjustable
version can be programmed with external feedback
to any voltage, ranging from 0.6V to the input
voltage.
At dropout operation, the converter duty cycle
increases to 100% and the output voltage tracks
the input voltage minus the Rdson drop of the
high-side MOSFET.
The internal error amplifier and compensation
provides excellent transient response, load, and line
regulation. Soft start function prevents input inrush
current and output overshoot during start up.
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