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JM2420 PDF даташит

Спецификация JM2420 изготовлена ​​​​«JABRIEL» и имеет функцию, называемую «2A Synchronous Step-Down Converter».

Детали детали

Номер произв JM2420
Описание 2A Synchronous Step-Down Converter
Производители JABRIEL
логотип JABRIEL логотип 

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JM2420 Даташит, Описание, Даташиты
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
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JM2420 Даташит, Описание, Даташиты
JM2420
Absolute Maximum Ratings (Note 1)
Input Supply Voltage ……… -0.3V to 6V
EN,VFB 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…………45oC/W
Maximum Thermal Dissipation at Ta=25oC
Pin Description
PIN NAME
FUNCTION
Chip Enable Pin. Drive EN above 1.5V to turn on the part. Drive EN
1 EN below 0.3V to turn it off. Do not leave EN floating.
Power Supply Input. Must be closely decoupled to GND with a 10µF
2 PVDD or greater ceramic capacitor.
3
4,6
5
7,8
9,10
VDD
GND
FB
LX
PGND
EP
Analog supply input pin.
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
Compass Electronics Science & Technology Co.,Ltd
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JM2420 Даташит, Описание, Даташиты
Electrical Characteristics (Note 3)
JM2420
(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
Reference Voltage Line
Regulation
Output Voltage Accuracy
Output Voltage Load
Regulation
(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
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%
VRUN=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
100
90
4
1.0
±0.01
±0.01
150
150
1.50
±1.0
±1.0
KHz
m
m
A
V
µA
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
Compass Electronics Science & Technology Co.,Ltd
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