MP1580HS-LF-Z MPS, MP1580HS-LF-Z Datasheet

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MP1580HS-LF-Z

Manufacturer Part Number
MP1580HS-LF-Z
Description
Manufacturer
MPS
Datasheet

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Part Number:
MP1580HS-LF-Z
Manufacturer:
MPS
Quantity:
2 901
The Future of Analog IC Technology
DESCRIPTION
The MP1580 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.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting and thermal shutdown. In
shutdown mode the regulator draws 23μA of
supply current.
The MP1580 requires a minimum number of
readily available standard external components. A
synchronization pin allows the part to be driven to
600KHz.
EVALUATION BOARD REFERENCE
TYPICAL APPLICATION
MP1580 Rev. 3.0
10/10/2007
4.75V to 25V
NOT USED
OFF ON
Board Number
INPUT
OPEN
EV0007
7
8
EN
SYNC
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
GND
4
2
IN
MP1580
OPEN
2.3”X x 1.5”Y x 0.5”Z
C6
Dimensions
COMP
BS
6
1
SW
FB
C3
2.2nF
10nF
C5
© 2007 MPS. All Rights Reserved.
3
5
www.MonolithicPower.com
TM
TM
D1
FEATURES
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
2A Output Current
0.18Ω Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
Capacitors
Up to 95% Efficiency
23μA Shutdown Mode
Fixed 380KHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75 to 25V Operating Input Range
Output Adjustable from 1.22V to 21V
Programmable Under Voltage Lockout
Frequency Synchronization Input
Available in an 8-Pin SO Package
Distributed Power Systems
Battery Chargers
Pre-Regulator for Linear Regulators
OUTPUT
2.5V / 2A
MP1580_TAC_S01
95
90
85
80
75
70
Step-Down Converter
0
Efficiency vs
Output Current Voltage
OUTPUT CURRENT (A)
V
V
0.5
OUT
V
OUT
OUT
= 5.0V
= 3.3V
= 2.5V
MP1580
2A, 380 KHz
1
V
IN
1.5
MP1580_TAC_EC01
= 10V
2
1

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MP1580HS-LF-Z Summary of contents

Page 1

... Frequency Synchronization Input • Available in an 8-Pin SO Package APPLICATIONS • Distributed Power Systems • Battery Chargers Dimensions • Pre-Regulator for Linear Regulators “MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic Power Systems, Inc. C5 10nF OUTPUT SW 2. ...

Page 2

... GND 4 5 MP1580_PD01-SOIC8 Part Number* Package MP1580HS SOIC8 * For Tape & Reel, add suffix –Z (eg. MP1580HS–Z) For Lead Free, add suffix –LF (eg. MP1580HS –LF–Z) ABSOLUTE MAXIMUM RATINGS Supply Voltage (V )..................................... 27V IN Switch Voltage (V ).................. – Bootstrap Voltage (V ) ....................... V BS Feedback Voltage (V ) .................– ...

Page 3

... Synchronization Input. This pin is used to synchronize the internal oscillator frequency to 8 SYNC an external source. There is an internal 11kΩ pull down resistor to GND; therefore leave SYNC unconnected if unused. MP1580 Rev. 3.0 10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP1580 – 2A, 380KHz STEP-DOWN CONVERTER (continued) Symbol Condition ...

Page 4

... FOLDBACK COMPARATOR MP1580 Rev. 3.0 10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP1580 – 2A, 380KHz STEP-DOWN CONVERTER MP1580 reverts to its initial M1 off, M2 on, state. If the Current Sense Amplifier plus Slope Compensation signal does not exceed the COMP voltage, then the falling edge of the CLK resets the Flip-Flop ...

Page 5

... MP1580 Rev. 3.0 10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP1580 – 2A, 380KHz STEP-DOWN CONVERTER A good rule for determining the inductance is to allow the peak-to-peak ripple current in the inductor to be approximately 30% of the maximum load current ...

Page 6

... LC filter and f is the oscillator frequency. MP1580 Rev. 3.0 10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP1580 – 2A, 380KHz STEP-DOWN CONVERTER In the case of tantalum or low-ESR electrolytic capacitors, the ESR dominates the impedance at the oscillator frequency, therefore the output ...

Page 7

... A good rule of thumb is to set the crossover frequency to approximately 1/10 of the switching frequency. MP1580 Rev. 3.0 10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP1580 – 2A, 380KHz STEP-DOWN CONVERTER In this case, the switching frequency is 380KHz, so use a crossover frequency, f Lower crossover frequencies result in slower response and worse transient load recovery ...

Page 8

... MP1580 Rev. 3.0 10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP1580 – 2A, 380KHz STEP-DOWN CONVERTER compensation Negative Output Voltage The MP1580 can be configured as a buck- boost regulator to supply negative output voltage. Because the GND pin of the IC is now ≥ ...

Page 9

... NOT USED Figure 3—Application Circuit for -5V Supply INPUT 4.75V to 20V OFF ON OPEN NOT USED Figure 4—MP1580 with Murata 22µF/10V Ceramic Output Capacitor MP1580 Rev. 3.0 10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. MP1580 – 2A, 380KHz STEP-DOWN CONVERTER C5 10nF ...

Page 10

... NOTICE: The information in this document is subject to change without notice. Please contact MPS for current specifications. Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS products into any application. MPS will not assume any legal responsibility for any said applications. ...

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