MT3420 PDF даташит
Спецификация MT3420 изготовлена «Aerosemi Technology» и имеет функцию, называемую «2A Synchronous Step-Down Converter». |
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Детали детали
Номер произв | MT3420 |
Описание | 2A Synchronous Step-Down Converter |
Производители | Aerosemi Technology |
логотип |
10 Pages
No Preview Available ! |
MT3420 Rev.V1.2
1.4MHz, 2A Synchronous Step-Down Converter
FEATURES
• High Efficiency: Up to 96%
• 1.4MHz Constant Frequency Operation
• 2A Output Current
• No Schottky Diode Required
• 2.5V to 5.5V Input Voltage Range
• Output Voltage as Low as 0.6V
• PFM Mode for High Efficiency in
Light Load
• 100% Duty Cycle in Dropout Operation
• Low Quiescent Current: 40µA
• 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
• TDFN33-10 package
APPLICATIONS
• Cellular and Smart Phones
• Wireless and DSL Modems
• PDAs
• Portable Instruments
• Digital Still and Video Cameras
• PC Cards
GENERAL DESCRIPTION
The MT3420 is a 1.4MHz constant
frequency, current mode step-down
converter. It is ideal for portable equipment
requiring very high current up to 2A from
single-cell Lithium-ion batteries while still
achieving over 90% efficiency during peak
load conditions. The MT3420 also can run at
100% duty cycle for low dropout operation,
extending battery life in portable systems
while light load operation provides very low
output ripple for noise sensitive applications.
The MT3420 can supply up to 2A output
load current from a 2.5V to 5.5V input
voltage and the output voltage can be
regulated as low as 0.6V. The high switching
frequency minimizes the size of external
components while keeping switching losses
low. The internal slope compensation setting
allows the device to operate with smaller
inductor values to optimize size and provide
efficient operation. The MT3420 is available
in adjustable (0.6V to VIN) output voltage
version. The device is available in a Pb-free,
3x3mm 10-lead TDFN package and is rated
over the -40°C to +85°C temperature range.
This device offers two operation modes,
PWM control and PFM Mode switching
control, which allows a high efficiency over
the wider range of the load.
MT3420 Datasheet V1.2 October 2011
1 Aerosemi Technology Co.,LTD
No Preview Available ! |
Typical Application
MT3420 Rev.V1.2
Figure 1. Basic Application Circuit
Pin Description
PIN NAME
FUNCTION
1
2
3
4,6
5
7,8
9,10
EN
VDD
PVDD
GND
FB
LX
PGND
EP
Chip Enable Pin. Drive EN above 1.5V to turn on the part. Drive EN
below 0.3V to turn it off. Do not leave EN floating.
Analog supply input pin.
Power Supply Input. Must be closely decoupled to GND with a 10µF
or greater ceramic capacitor.
Analog ground pin.
Output Voltage Feedback Pin. An internal resistive divider divides the
output voltage down for comparison to the internal reference voltage.
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.
Power Ground Pin.
Power Ground exposed pad, Must be connected to bare copper
ground plane.
Pin Configuration
MT3420 Datasheet V1.2 October 2011
2 Aerosemi Technology Co.,LTD
No Preview Available ! |
MT3420 Rev.V1.2
Absolute Maximum Ratings (Note 1)
Input Supply Voltage ……… -0.3V to 6V
EN,FB Voltages….…-0.3 to (Vin+0.3V)
LX Voltage …………-0.3V to (Vin+0.3V)
Operating Temperature Range … -40°C to +85°C
Lead Temperature(Soldering,10s) …..…..+300°C
Storage Temperature Range ……-65°C to 150°C
Thermal Information (Note 2)
Thermal Resistance…………45°C/W
Maximum Thermal Dissipation at Ta=25°C
Electrical Characteristics (Note 3)
(VIN=VEN=3.6V, VOUT=1.8V, TA = 25°C, unless otherwise noted.)
Parameter
Conditions
MIN
Input Voltage Range
2.5
UVLO Threshold
1.7
Input DC Supply Current
PWM Mode
PFM Mode
Shutdown Mode
Regulated Feedback
Voltage VFB
Reference Voltage Line
Regulation
Output Voltage Accuracy
Output Voltage Load
Regulation
(Note 4)
Vout = 90%, Iload=0mA
Vout = 105%, Iload=0mA
VEN = 0V, VIN=4.2V
TA = 25°C
TA = 0°C ≤ TA ≤ 85°C
TA = -40°C ≤ TA ≤ 85°C
Vin=2.5V to 5.5V
VIN = 2.5V to 5.5V,
Iout=10mA to 2000mA
Iout=10mA to 2000mA
0.588
0.586
0.585
-3
Oscillation Frequency
Vout=100%
Vout=0V
On Resistance of PMOS
On Resistance of NMOS
Peak Current Limit
EN Threshold
EN Leakage Current
SW Leakage Current
ISW=100mA
ISW=-100mA
VIN= 3V, Vout=90%
VEN=0V,VIN=Vsw=5V
0.30
TYP MAX unit
5.5 V
1.9 2.1 V
150 300
40 75
0.1 1.0
µA
µA
µA
µA
0.600 0.612 V
0.600 0.613 V
0.600 0.615 V
0.1 %/V
+3 %Vout
0.2 %/A
1.4 MHz
300 KHz
100 150 mΩ
90 150 mΩ
4A
1.0 1.50 V
±0.01 ±1.0 µA
±0.01 ±1.0 µA
MT3420 Datasheet V1.2 October 2011
3 Aerosemi Technology Co.,LTD
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