MP2303
3A, 28V, 340KHz Synchronous Rectified Step-Down Converter
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
The Future of Analog IC Technology
TM
TM
润肺止咳DESCRIPTION
The MP2303 is a monolithic synchronous buck regulator. The device integrates power MOSFETS that provide 3A continuous load current over a wide operating input voltage of 4.75V to 28V. Current mode control provides fast transient respon and cycle-by-cycle current limit.
An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current drops to 1µA.
This device, available in 8-pin SOIC and 3x3 10-pin QFN packages, provides a very compact system solution with minimal reliance on external components.
EVALUATION BOARD REFERENCE
Board Number Dimensions EV2303DN-00A
2.0”X x 1.5”Y x 0.5”Z
FEATURES
• 3A Output Current
• Wide 4.75V to 28V Operating Input Range • Integrated Power MOSFET Switches • Output Adjustable from 0.8V to 25V • Up to 95% Efficiency • Programmable Soft-Start胡箩卜
• 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 and
3x3 QFN10 Packages
APPLICATIONS
• Distributed Power Systems
• Pre-Regulator for Linear Regulators • Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
100
90
80
70
60
50
E F F I C I E N C Y (%)
0.5
1.0
1.5
2.0
2.5
3.0
LOAD CURRENT (A)
MP2303-EC01
Efficiency vs Load Current
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
TM
PACKAGE REFERENCE
* For Tape & Reel, add suffix –Z (eg. MP2303DN–Z)
For RoHS compliant packaging, add suffix –LF (eg.
MP2303DN–LF–Z)
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage V IN .......................–0.3V to +30V Switch Voltage V SW .................–1V to V IN + 0.3V Boost Voltage V BS ..........V SW – 0.3V to V SW + 6V All –0.3V to +6V 150°C 260°C Storage Temperature .............–65°C to +150°C
*
For Tape & Reel, add suffix –Z (eg. MP2303DQ–Z) For RoHS compliant packaging, add suffix –LF (eg. MP2303DQ–LF–Z)
Recommended Operating Conditions (2)
Input Voltage V IN ............................4.75V to 28V Output Voltage V OUT ........................0.8V to 25V Ambient –40°C to +85°C
Thermal Resistance (3)
θJA θJC
<50......10...°C/W 50......12...°C/W
Notes:
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 (4)
V IN = 12V, T A = +25°C, unless otherwi noted.
Parameter Symbol Condition Min Typ (4)
Max Units
Shutdown Supply Current V EN = 0V
0.3 3.0 µA Supply Current V EN = 2.7V, V FB = 1.0V 1.3 1.5 mA
4.75V ≤ V IN ≤ 28V, T A = +25°C
0.780 0.800 0.820 V Feedback Voltage
V FB
–40°C ≤ T A ≤ +85°C
0.772 0.828 V OVP Threshold Voltage 0.90 0.95 1.00 V Error Amplifier Voltage Gain A EA 400 V/V Error Amplifier Transconductance
G EA
∆I C = ±10µA
550 820 1100 µA/V
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
TM长城英文介绍
ELECTRICAL CHARACTERISTICS (4) (continued)
V IN = 12V, T A = +25°C, unless otherwi noted.
Parameter Symbol Condition Min Typ (4)
Max Units High-Side Switch-On Resistance R DS(ON)1 125 m Ω Low-Side Switch-On Resistance R DS(ON)2 125 m Ω High-Side Switch Leakage Current V EN = 0V, V SW = 0V 0 10 µA Upper-Switch Current Limit 4.3 6.3 A Lower-Switch Current Limit From Drain to Source 1.25 A
COMP to Current Sen
Transconductance G CS
9 A/V
T A = +25°C 300 340 380 KHz Oscillation Frequency
F osc1
–40°C ≤ T A ≤ +85°C
270 400 KHz Short Circuit Oscillation Frequency F osc2 V FB = 0V
110 KHz
Maximum Duty Cycle D MAX V FB = 0.7V 90 %
Minimum On-Time
220 ns EN Shutdown Threshold Voltage V EN Rising 1.1 1.5 2.0 V EN Shutdown Threshold Voltage Hysteresis
220 mV
2.2 2.5 2.7 V EN Lockout Threshold Voltage –40°C ≤ T A ≤ +85°C 2.1 2.8 V EN Lockout Hysteresis
210
mV
V IN rising, T A = +25°C 3.8 4.05 4.30 V Input Under Voltage Lockout Threshold
UVLO
–40°C ≤ T A ≤ +85°C
3.5
4.70 V Input Under Voltage Lockout Threshold Hysterisis 210 mV Soft-Start Current V SS = 0V 6 µA
布丁的做法大全Thermal Shutdown
160 °C
Note:
4) 100% production test at +25°C. Specifications over the temperature range are guaranteed by design and characterization.
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
TM
PIN FUNCTIONS
SOIC8N
Pin #
3x3
QFN10
Pin #
Name Description
1 9 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 1 IN
Power Input. IN supplies the power to the IC, as well as the step-down converter switches. Drive IN with a 4.75V to 28V power source. Bypass IN to GND with a
suitably large capacitor to eliminate noi on the input to the IC. See Input Capacitor.
3 2 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 3, 4,
5 GND
Ground. SOIC8: Connect the expod pad to pin 4. 3x3 QFN10: Connect to pins
3, 4 and 5 and ensure that said pins are tied together.
5 6 FB Feedback Input. FB ns the output voltage to regulate that voltage. Drive FB
with a resistive voltage divider from the output voltage. The feedback reference
voltage is 0.8V. See Setting the Output Voltage.
三大改造意义
6 7 COMP
Compensation Node. COMP is ud to compensate the regulation control loop. Connect a ries RC network from COMP to GND to compensate the regulation
control loop. In some cas, an additional capacitor from COMP to GND is required. See Compensation Components.
7 8 EN Enable Input. EN is a digital input that turns the regulator on or off. Drive EN higher
than 2.7V to turn on the regulator, drive it lower than 1.1V to turn it off. Pull up to
the IN pin with 100k Ω resistor for automatic startup.
8 10 SS
Soft-start Control Input. SS controls the soft-start period. Connect a capacitor from
SS to GND to t the soft-start period. See Soft-Start Capacitor.
MP2303 – 3A, 28V, 340KHz SYNCHRONOUS RECTIFIED, STEP-DOWN CONVERTER
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
TM
TYPICAL PERFORMANCE CHARACTERISTICS
V IN = 12V, V O = 3.3V, L = 10µH, C1 = 10µF, C2 = 22µF x 2, T A = +25°C, unless otherwi noted.
MP2303-TPC01
Feeback Voltage vs. Temperature MP2303-TPC02
UVLO Rising vs.Temperature
MP2303-TPC04
Oscillator Frequency
0.810
0.8050.8000.7950.7900.78500.7804.5
4.44.34.24.14.03.93.83.7-40
-20
020406080
-40
-20
20
40
60
80
蝴蝶结画法
F E E D B A C K V O L T A
G E (V )
F R E Q U E N C Y (K H z )
TEMPERATURE (o C)
345
340
335
330
325
-40
-20020406080
TEMPERATURE (o C)
企业会计制度最新版TEMPERATURE (o C)
U V L O T H R E S H O L D (V )
MP2303-TPC03
Enable Lockout Threshold vs. Temperature
2.70
2.65
2.602.552.502.452.402.352.30
-40
-20
20
40
60
80
E N A B L E V O L T A G E (V )
TEMPERATURE (o C)
95
90
8580757065605550E F F I C I E N C Y (%)
0.5
1.0
1.5
2.0
2.5
3.5
3.0
LOAD CURRENT (A)
MP2303-EC02
Efficiency vs
Load Current
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