什么是t恤衫MP1493
3A, 4.2V-16V Input, Fast Transient
Synchronous
Step-down
Converter The Future of Analog IC Technology
DESCRIPTION
The MP1493 is a fully integrated, high–efficiency 3A synchronous rectified step-down converter. The MP1493 operates at high efficiency over a wide output current load range. Adaptive Constant-On-Time (COT) control mode provides fast transient respon, eas loop stabilization, and operates with a low-cost electrolytic capacitor.
The MP1493 requires a minimum number of readily available standard external components and is available in an 8-pin SOIC ROHS compliant package. FEATURES
•Wide 4.2V to 16V Operating Input Range •3A Output Current
•Adaptive COT for Fast Transient
Respon
• Low R DS(ON) Internal Power MOSFETs •Proprietary Switching Loss Reduction Technique
•Programmable Switching Frequency •OCP, SCP, OVP, UVP Protection and Thermal Shutdown
•Optional OCP Protection: Latch-off Mode and Hiccup Mode
•Output Adjustable from 0.805V to 13V APPLICATIONS
•Digital Set Top Boxes
•Flat Panel Television and Monitors
• Distributed
Power
Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green status, plea visit MPS website under Quality Assurance. “MPS” and “The Future of Analog IC Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
ORDERING INFORMATION
Part Number OCP Protection Package Top Marking Free Air Temperature (T A )
MP1493DS* Latch-off Mode MP1493 MP1493DS-A
Hiccup Mode
SOIC8
MP1493-A
-40°C to +85°C
* For Tape & Reel, add suffix –Z (e.g. MP1493DS–Z).
For RoHS Compliant Packaging, add suffix –LF (e.g. MP1493DS–LF–Z)
PACKAGE REFERENCE
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage V IN .......................................19V V SW ...................................................................... -0.3V (-5V for <10ns) to 19V (24V for <10ns) V BST ......................................................V SW + 6V All -0.3V to +6V
Continuous Power Dissipation (T A = +25°C) (2)
<1.39W Junction Temperature ..............................150°C 260°C -65°C to +150°C
Recommended Operating Conditions (3)
Supply Voltage V IN ...........................4.2V to 16V Output Voltage V OUT .....................0.805V to 13V Operating Junction Temp. (T J ).-40°C to +125°C
Thermal Resistance (4)
θJA θJC
<.90......45...°C/W
Notes:
1) Exceeding the ratings may damage the device.
2) The maximum allowable power dissipation is a function of the
maximum junction temperature T J (MAX), the junction-to-ambient thermal resistance θJA , and the ambient temperature T A . The maximum allowable continuous power dissipation at any ambient temperature is calculated by P D (MAX) = (T J (MAX)-T A )/θJA . Exceeding the maximum allowable power dissipation will cau excessive die temperature, and the regulator will go into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage.
3) The device is not guaranteed to function outside of its
operating conditions.
4) Measured on JESD51-7, 4-layer PCB.
ELECTRICAL CHARACTERISTICS
V IN = 12V, T A = +25°C, unless otherwi noted.
Parameters Symbol Condition Min Typ Max Units Supply Current (Shutdown) I IN V EN =0V 5 μA Supply Current (Quiescent, Not
Switching)
I IN V EN =2V, V FB =0.9V 1 mA HS Switch On Resistance HS RDS-ON 120 m Ω LS Switch On Resistance LS RDS-ON 60 m Ω
Switch Leakage SW LKG V EN =0V, V SW =0V or
12Vheart attack
0 10 μA
Current Limit (5) I LIMIT After Soft-Start
Time-out
4.0
5.0 A
wtOne-Shot On Time T ON R 7=300k Ω,V OUT = 1.2V 250 ns Minimum Off Time T OFF 130 150 ns Fold-back Off Time T FB I LIM = 1 1.25 μs OCP hold-off time T OC I LIM = 1 50 μs Feedback Voltage V FB 789 805 821 mV Feedback Current I FB V FB =800mV 10 50 nA Soft Start Time T SS 1 ms EN Rising Threshold VILEN 1.05 1.35 1.6 V EN Threshold Hysteresis VIHEN 500 mV
V EN =2V 2
EN Input Current I EN V EN =0V 0
μA
VIN Under Voltage Lockout
Threshold Rising
INUVVth 3.1 V
VIN Under Voltage Lockout
Threshold Hysteresis INUVHYS
300 mV Thermal Shutdown
150 °C Thermal Shutdown Hysteresis
25
°C
Note:
5) Guaranteed by design and characterization..
PIN FUNCTIONS
SOIC-8 Pin #
Name Description
1 IN
Supply Voltage. The MP1493 operates from a +4.2V to +16V input rail. C1 is needed to
decouple the input rail. U wide PCB traces and multiple vias to make the connection.
chloe什么意思2 GND
System Ground. This pin is the reference ground of the regulated output voltage. For this
reason care must be taken in PCB layout.
3 SW Switch Output. U wide PCB traces and multiple vias to make the connection.
4 BST
Bootstrap. A capacitor connected between SW and BST pins is required to form a floating
supply across the high-side switch driver.
5 BYP
Internal LDO output. Decouple with a 1µF ceramic capacitor. X7R or X5R grade dielectric
ceramic capacitors are recommended for their stable temperature characteristics.
6 EN
EN=1 to enable the MP1493. For automatic start-up, connect EN pin to VIN with a pull-up
resistor.
7 FB
Feedback. An external resistor divider from the output to GND, tapped to the FB pin, ts
the output voltage.
8 FREQ Switching frequency tting pin during CCM operation. Connect a resistor R 7 to IN to t the
switching frequency. An optional 1nF decoupling capacitor can be added to improve any
switching frequency jitter that may be prent.
TYPICAL PERFORMANCE CHARACTERISTICS
ycc
V IN =12V, V OUT =1.2V, L=2.2µH, T A =+25°C, unless otherwi noted.
Line Regulation
Load Regulation
Frequency vs. Temperature
I OUT (A)
I OUT (A)
I OUT (A)生活大爆炸第七集
-1.2
dictation-1.0-0.8-0.6-0.4-0.20.00.20.40.60.81.01.2V IN
(V)
-1.00
-0.80
-英语知识
0.60-0.40-0.200.00
0.200.400.600.801.0005101520
2530400
405
410
415420425430435440445450-40-20
020406080100120140
F S W (k H Z )
V OUT VS. I OUT
pylV OUT =1.2V, Freq=500kHz
I OUT (A)
V O U T (V )
1.11.121.141.161.181.21.221.240.01
0.1
110
TYPICAL PERFORMANCE CHARACTERISTICS (continued) V IN=12V, V OUT=1.2V, L=2.2µH, T A=+25°C, unless otherwi noted.
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