开关电源IC

Current Sense Transconductance Output Current to Comp Pin Voltage
GCS
Error Amplifier Voltage Gain Error Amplifier Transconductance Oscillator Frequency Short Circuit Frequency Soft-Start Pin Equivalent Output Resistance
AVEA GEA fS
∆IC = ±10µA VFB = 0V
Min 0.892
2.8
630
Typ 0.920 0.18
10 0 3.5
1.95
400 930 1.4 210
9
Max 0.948
10
1230
Units V Ω Ω µA A
A/V
V/V µA/V MHz KHz
kΩ
MP2361 Rev. 1.2
Symbol Condition
Feedback Voltage
Upper Switch On Resistance Lower Switch On Resistance Upper Switch Leakage Current Limit (4)
VFB RDS(ON)1 RDS(ON)2
4.75V ≤ VIN ≤ 23V VEN = 0V; VSW = 0V
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc.
TYPICAL APPLICATION
INPUT 4.75V to 23V
C5
10nF
4
2
IN 9 EN
BS SW 5
For Lead Free, add suffix –LF (eg. MP2361DQ –LF–Z)
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage (VIN)..................................... 25V Switch Node Voltage (VSW) .......................... 26V Bootstrap Voltage (VBS) ....................... VSW + 6V Feedback Voltage (VFB) .................–0.3V to +6V Enable/UVLO Voltage (VEN)...........–0.3V to +6V Comp Voltage (VCOMP) ...................–0.3V to +6V Junction Temperature .............................+150°C
ELECTRICAL CHARACTERISTICS (continued)
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Symbol Condition
Maximum Duty Cycle
DMAX VFB = 0.8V
Minimum On Time
MP2361
2A, 23V, 1.4MHz Step-Down Converter
FEATURES
• 2A Output Current with QFN Package • 0.18Ω Internal Power MOSFET Switch • Stable with Low ESR Output Ceramic
operating conditions. 3) Measured on approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameter
Current mode operation provides fast transient response and eases loop stabilization.
Fault condition protections include cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 20µA of supply current. Programmable soft-start minimizes the inrush supply current and the output overshoot at initial startup.
© 2006 MPS. All Rights Reserved.
TM
MP2361 – 2A, 23V, 1.4MHz STEP-DOWN CONVERTER
PACKAGE REFERENCE
TOP VIEW
NC 1 BS 2 NC 3 IN 4 SW 5
10 SS 9 EN 8 COMP 7 FB 6 GND
TM
The Future of Analog IC Technology TM
DESCRIPTION
The MP2361 is a monolithic step-down switch mode converter with a built-in internal power MOSFET. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation.
VOUT=2.5V
50 0
0.5 1.0 1.5 2.0 LOAD CURRENT (A)
MP2361-EC01
MP2361 Rev. 1.2
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1
1/11/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
MP2361
10 SS
7 FB
GND
COMP
C4 10nF
6
C6 OPEN
8
C3 1.8nF
D1 B220A
VOUT 2.5V/2A
MP2361_TAC_S01
EFFICIENCY (%)
Efficiency vs Load Current
100
90
VOUT=5V
80 70 VOUT=3.3V 60
MP2361_PD01-MSOP10
Part Number** Package
Temperature
MP2361DK
MSOP10 –40°C to +85°C
** For Tape & Reel, add suffix –Z (eg. MP2361DK–Z)
For Lead Free, add suffix –LF (eg. MP2361DK –LF–Z)
EXPOSED PAD ON BACKSIDE
MP2361_PD01-QFN10
Part Number* MP2361DQ
Package
QFN10 (3mm x 3mm)
Temperature –40°C to +85°C
* For Tape & Reel, add suffix –Z (eg. MP2361DQ–Z)
QFN10 (3mmx3mm) ............... 50 ...... 12... °C/W MSOP10 ................................ 150 ..... 65... °C/W
Notes: 1) Exceeding these ratings may damage the device. 2) The device is not guaranteed to function outside of its
Tiny MSOP Packages • Evaluation Board Available
APPLICATIONS
• Distributed Power Systems • Battery Charger • DSL Modems • Pre-Regulator for Linear Regulators
Capacitors • 90% Efficiency • 20µA Shutdown Mode • Fixed 1.4MHz Frequency • Thermal Shutdown • Cycle-by-Cycle Over Current Protection • Wide 4.75V to 23V Operating Input Range • Output Adjustable from 0.92V to 16V • Programmable Under Voltage Lockout • Available in 10-pin QFN (3mm x 3mm) and
tON
EN Shutdown Threshold Voltage
VEN ICC > 100µA
Enable Pull-Up Current
IEN VEN = 0V
EN UVLO Threshold Rising
VUVLO VEN Rising
EN UVLO Threshold Hysteresis
Supply Current (Shutdown)
Lead Temperature ..................................+260°C
Storage Temperature.............. –65°C to +150°C
NC 1 BS 2 NC 3 IN 4 SW 5
TOP VIEW
10 SS 9 EN 8 COMP 7 FB 6 GND
Recommended Operating Conditions (2)
Supply Voltage (VIN) ...................... 4.75V to 23V Operating Temperature .............–40°C to +85°C
Thermal Resistance (3) θJA θJC
IOFF VEN ≤ 0.4V
Supply Current (Quiescent)
ION VEN ≥ 3V
Thermal Shutdown
Note: 4) Equivalent output current = 1.5A ≥ 50% Duty Cycle
2.0A ≤ 50% Duty Cycle Assumes ripple current = 30% of load current. Slope compensation changes current limit above 40% duty cycle.
The MP2361 requires a minimum number of readily available standard external components.
EVALUATION BOARD REFERENCE
Board Number EV2361DQ-00A
Dimensions 2.3”X x 1.5”Y x 0.5”Z
Min
TypBaidu Nhomakorabea
Max Units
70
%
100
ns
0.7
1.0
1.3
V
1.0
µA
2.37 2.50 2.62
V
210
mV
20
36
µA
1.2
1.4
mA
160
°C
PIN FUNCTIONS
Pin # Name Description
1
NC No Connect.
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2
1/11/2006
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
TM
MP2361 – 2A, 23V, 1.4MHz STEP-DOWN CONVERTER