MP2307
3A, 23V, 340KHz Synchronous Rectified Step-Down Converter
The Future of Analog IC Technology
TM
TM
不多不少DESCRIPTION
The MP2307 is a monolithic synchronous buck regulator. The device integrates 100m Ω MOSFETS that provide 3A of continuous load current over a wide operating input voltage of 4.75V to 23V. Current mode control provides fast transient respon and cycle-by-cycle current limit.
An adjustable soft-start prevents inrush current at turn-on and in shutdown mode, the supply current drops below 1µA.
This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components.
EVALUATION BOARD REFERENCE
Board Number Dimensions EV2307DN-00A
2.0”X x 1.5”Y x 0.5”Z
FEATURES
• 3A Continuous Output Current,
4A Peak Output Current
• Wide 4.75V to 23V Operating Input Range • Integrated 100m Ω Power MOSFET Switches • Output Adjustable from 0.925V to 20V • Up to 95% Efficiency • Programmable Soft-Start
• Stable with Low ESR Ceramic Output Capacitors • Fixed 340KHz Frequency
• Cycle-by-Cycle Over Current Protection • Input Under Voltage Lockout
• Thermally Enhanced 8-Pin SOIC Package
APPLICATIONS
• Distributed Power Systems • Networking Systems
• FPGA, DSP, ASIC Power Supplies • Green Electronics/Appliances • Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
C5
10095
908580757065605550E F F I C I E N C Y (%)
0.1
1.0
10
LOAD CURRENT (A)
MP2307_EC01
Efficiency vs Load Current
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER TM
PACKAGE REFERENCE
* For Tape & Reel, add suffix –Z (eg. MP2307DN–Z)
For Lead Free, add suffix –LF (eg. MP2307DN–LF–Z) ABSOLUTE MAXIMUM RATINGS (1) Supply Voltage .–0.3V to +26V Switch Voltage –1V to V IN + 0.3V Boost Voltage V SW – 0.3V to V SW + 6V All –0.3V to +6V 150°C 260°C Storage Temperature .............–65°C to +150°C Recommended Operating Conditions (2) Input Voltage 4.75V to 23V Output Voltage 0.925V to 20V Ambient –40°C to +85°C Thermal Resistance (3)θJA θJC
<50......10...°C/W Notes:
bunker
1) Exceeding the ratings may damage the device.
2) The device is not guaranteed to function outside of its
operating conditions.
3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS V
IN
= 12V, T A = +25°C, unless otherwi noted.
Parameter Symbol Condition
Min
Typ
三月英语Max
Units Shutdown Supply Current V EN = 0V 0.3 3.0 µA
Supply Current V EN = 2.0V, V FB = 1.0V 1.3 1.5 mA
Feedback Voltage V FB 4.75V ≤ V IN≤ 23V 0.900 0.925 0.950 V
Feedback Overvoltage Threshold 1.1 V
Error Amplifier Voltage Gain (4)A EA 400 V/V
Error Amplifier Transconductance G EA∆I C = ±10µA 820 µA/V
High-Side Switch On-Resistance (4)R DS(ON)1 100 mΩ
Low-Side Switch On-Resistance (4)R DS(ON)2 100 mΩ
High-Side Switch Leakage Current V EN = 0V, V SW = 0V 0 10 µA
Upper Switch Current Limit Minimum Duty Cycle 4.0 5.8 A
Lower Switch Current Limit From Drain to Source 0.9 A
COMP to Current Sen
Transconductance
G CS 5.2 A/V
Oscillation Frequency F osc1300 340 380 KHz
Short Circuit Oscillation Frequency F osc2V FB = 0V 110 KHz
Maximum Duty Cycle D MAX V FB = 1.0V 90 %
Minimum On Time (4)T ON 220 ns
EN Shutdown Threshold Voltage V EN Rising 1.1 1.5 2.0 V
EN Shutdown Threshold Voltage
Hysterisis
220 mV
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
TM
ELECTRICAL CHARACTERISTICS (continued)
V IN = 12V, T A = +25°C, unless otherwi noted.
Parameter Symbol Condition Min
Typ Max Units
EN Lockout Threshold Voltage
2.2 2.5 2.7 V EN Lockout Hysterisis
210 mV Input Under Voltage Lockout Threshold
V IN Rising
3.80baronet
4.05
4.40
V
Input Under Voltage Lockout Threshold Hysteresis 210 mV
Soft-Start Current V SS = 0V 6 µA Soft-Start Period
C SS = 0.1µF 15 ms Thermal Shutdown (4)
160 °C
Note:
4) Guaranteed by design, not tested.
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
TM
TYPICAL PERFORMANCE CHARACTERISTICS
C1 = 2 x 10µF, C2 = 2 x 22µF, L= 10µH, C SS= 0.1µF, T A = +25°C, unless otherwi noted.
V IN
20mV/div.
V OUT
20mV/div.
2013北京中考分数线V
SW
10V/div.
担心英文
I L
1A/div.
MP2307-TPC01
Steady State Test
Waveforms
V IN = 12V, V OUT = 3.3V, I OUT = 0A
V IN
200mV/div.
V OUT
20MV/div.
V SW
V/div.
I L
2A/div.
MP2307-TPC02
Steady State Test
Waveforms
V
IN = 12V, V OUT = 3.3V, I OUT = 3A
V EN
5V/div.
V OUT
2V/div.
V SW
despicable me
10V/div.
I L
1A/div.
2ms/div.
MP2307-TPC03
Startup through
Enable Waveforms
V IN = 12V, V OUT = 3.3V, No Load
V EN
5V/div.
V OUT
2V/div.
V SW
10V/div.
I L
2A/div.
2ms/div.
MP2307-TP04
Startup Through
Enable Waveforms
V IN = 12V, V OUT = 3.3V,
I OUT = 3A (Resistance Load)
V EN
5V/div.
V OUT
2V/div.
V SW
10V/div.
I L
1A/div.
2ms/div.
MP2307-TPC05
Shutdown Through
Enable Waveforms
上海洋泾中学
V IN = 12V, V OUT = 3.3V, No Load
V OUT
2V/div.
V SW
10V/div.
V EN
5V/div.
中美战略与经济对话
I
L
2A/div.
MP2307-TPC06
Shutdown Through
Enable Waveforms
V IN = 12V, V OUT = 3.3V,
I OUT
= 3A (Resistance Load)
V OUT
200mV/div.
I L
1A/div.
I LOAD
1A/div.
MP2307 -TPC07
Load Transient Test
Waveforms
V IN = 12V, V OUT
= 3.3V,
I OUT = 1A to 2A step
V OUT
2V/div.
I L
2A/div.
MP2307-TPC08
Short Circuit Test
Waveforms
V IN = 12V, V OUT = 3.3V
V OUT
2V/div.
I L
2A/div.
MP2307-TPC09
Short Circuit Recovery
Waveforms
V IN = 12V, V OUT = 3.3V
MP2307 – 3A, 23V, 340KHz SYNCHRONOUS RECTIFIED STEP-DOWN CONVERTER
TM
PIN FUNCTIONS
Pin #
外教老师
Name Description
1 BS
High-Side Gate Drive Boost Input. BS supplies the drive for the high-side N-Channel MOSFET
switch. Connect a 0.01µF or greater capacitor from SW to BS to power the high side switch. 2 IN Po
wer Input. IN supplies the power to the IC, as well as the step-down converter switches.
Drive IN with a 4.75V to 23V power source. Bypass IN to GND with a suitably large capacitor
to eliminate noi on the input to the IC. See Input Capacitor .
3 SW Power Switching Output. SW is the switching node that supplies power to the output. Connect
the output LC filter from SW to the output load. Note that a capacitor is required from SW to
BS to power the high-side switch.
4 GND Ground (Connect the expod pad to Pin 4).
5 FB Feedback Input. FB ns the output voltage and regulates it. Drive FB with a resistive
voltage divider connected to it from the output voltage. The feedback threshold is 0.925V. See
Setting the Output Voltage .
6 COMP Compensation Node. COMP is ud to compensate the regulation control loop. Connect a
ries RC network from COMP to GND. In some cas, an additional capacitor from COMP to
GND is required. See Compensation Components.
7 EN
Enable Input. EN is a digital input that turns the regulator on or off. Drive EN high to turn on
the regulator; low to turn it off. Attach to IN with a 100k Ω pull up resistor for automatic startup. 8 SS Soft-Start Control Input. SS controls the soft-start period. Connect a capacitor from SS to GND
to t the soft-start period. A 0.1µF capacitor ts the soft-start period to 15ms. To disable the
soft-start feature, leave SS unconnected.
