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PDF JM2420 Data sheet ( Hoja de datos )
| Número de pieza | JM2420 | |
| Descripción | 2A Synchronous Step-Down Converter | |
| Fabricantes | JABRIEL | |
| Logotipo |  |
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JM2420
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
• 100% Duty Cycle in Dropout
• 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
• DFN33-10 package
APPLICATIONS
• Cellular and Smart Phones
• Wireless and DSL Modems
• PDAs
• Portable Instruments
GENERAL DESCRIPTION
The JM2420 is a 1.4MHz constant frequency
current mode PWM step-down converter. It
Typical Application
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 JM2420 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 JM2420 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 JM2420 is available in
adjustable (0.6V to VIN) and fixed (1.8V)
output voltage versions. 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.
JM2420
• PDAs
• Digital Still and Video Cameras
• PC Cards
Figure 1. Basic Application Circuit
Compass Electronics Science & Technology Co.,Ltd
1
1 page  
VOUT
Vin=3.6V
Vout=1.8V
Iout=600mA
10mV/DIV
SW
5V/DIV
IL
1A/DIV
400ns/DIV
PWM MODE
JM2420
Start up
Functional Block Diagram
Figure 2. JM2420 Block Diagram
Compass Electronics Science & Technology Co.,Ltd
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet JM2420.PDF ] | |
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