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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
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage ……-0.3V to 6.5V
RUN,FB Voltages……... -0.3V to 6.5V
SW Voltage …………-0.3V to (Vin+0.3V)
Peak SW Sink and Source Current...2.5A
Operating Temperature Range … -40°C to +85°C
Junction Temperature(Note2) ……………..125°C
Storage Temperature Range ..…-65°C to 150°C
Lead Temperature(Soldering,10s) ….…..+300°C
PACKAGE/ORDER INFORMATION
RUN 1
5 FB
GND 2
Part Number
IA3220L
SW 3
4 VIN
SWICHING
FREQUENCY
1.5MHz
SOT23-5
(SMOTT3243-150)
IA3220
Temperature
Range
-40°C to +85°C
OUTPUT
VOLTAGE (V)
ADJ
PIN DESCRIPTION
OUTPUT
CURRENT (A)
1.3
PIN NAME
FUNCTION
1
RUN
Chip Enable Pin. Drive RUN above 1.5V to turn on the part. Drive RUN below
0.3V to turn it off. Do not leave RUN floating.
2 GND Ground Pin
3
SW
Power Switch Output. It is the switch node connection to Inductor. This pin
connects to the drains of the internal P-ch and N-ch MOSFET switches.
4
VIN
Power Supply Input. Must be closely decoupled to GND with a 10µF or greater
ceramic capacitor.
5
FB
Feedback Input. An internal resistive divider divides the output voltage down for
comparison to the internal reference voltage.
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ELECTRICAL CHARACTERISTICS (Note 3)
IA3220
(VIN=VRUN=3.6V, VOUT=1.8V, TA = 25°C, unless otherwise noted.)
Parameter
Conditions
MIN
Input Voltage Range
2.3
UVLO Threshold
1.7
Input DC Supply Current
PWM Mode
PFM Mode
Shutdown Mode
Regulated Feedback
Voltage
(Note 4)
Vout = 90%, ILoad=0mA
Vout = 105%, ILoad=0mA
VRUN = 0V, VIN=4.2V
TA = 25°C
TA = 0°C ≤ TA ≤ 85°C
TA = -40°C ≤ TA ≤ 85°C
0.588
0.586
0.585
Reference Voltage Line
Regulation
Vin=2.5V to 6V
Output Voltage Line
Regulation
VIN = 2.5V to 6V
Output Voltage Load
Regulation
Oscillation Frequency
Vout=100%
Vout=0V
On Resistance of PMOS
ON Resistance of NMOS
Peak Current Limit
RUN Threshold
RUN Leakage Current
SW Leakage Current
ISW=100mA
ISW=-100mA
VIN= 3V, Vout=90%
VRUN=0V,VIN=Vsw=5V
0.30
TYP
1.9
140
35
0.1
0.600
0.600
0.600
0.04
0.04
0.5
1.5
300
0.13
0.1
2.0
1.0
±0.01
±0.01
MAX
6
2.1
300
70
1.0
0.612
0.613
0.615
0.40
unit
V
V
µA
µA
µA
µA
V
V
V
%/V
0.4 %
%
MHz
kHz
0.2
0.2
A
1.50 V
±1.0 µA
±1.0 µA
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following
formula: TJ = TA + (PD) x (250°C/W).
Note3: 100% production test at +25°C. Specifications over the temperature range are guaranteed by design
and characterization.
Note 4: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency.
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