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MP1580HS-LF-Z

P1-P3P4-P6P7-P9P10-P10
MP1580
2A, 380 KHz
Step-Down Converter
MP1580 Rev. 3.0 www.MonolithicPower.com 1
10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
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 23A 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
Board Number Dimensions
EV0007 2.3”X x 1.5”Y x 0.5”Z
FEATURES
• 2A Output Current
• 0.18 Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 95% Efficiency
• 23A 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
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP1580_TAC_S01
MP1580
SW
IN BS
FB
SYNC
COMPGND
EN
OUTPUT
2.5V / 2A
INPUT
4.75V to 25V
OPEN
NOT USED
OFF ON
C6
OPEN
C3
2.2nF
C5
10nF
D1
6
5
3
12
7
8
4
EFFICIENCY (%)
95
90
85
80
75
70
OUTPUT CURRENT (A)
MP1580_TAC_EC01
Efficiency vs
Output Current Voltage
0 0.5 1.512
V
OUT
= 5.0V
V
OUT
= 3.3V
V
OUT
= 2.5V
V
IN
= 10V
MP1580 – 2A, 380KHz STEP-DOWN CONVERTER
MP1580 Rev. 3.0 www.MonolithicPower.com 2
10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
TM
PACKAGE REFERENCE
BS
IN
SW
GND
SYNC
EN
COMP
FB
1
2
3
4
8
7
6
5
TOP VIEW
MP1580_PD01-SOIC8
Part Number* Package Temperature
MP1580HS SOIC8
–40°C to +125°C
*
For Tape & Reel, add suffix –Z (eg. MP1580HS–Z)
For Lead Free, add suffix –LF (eg. MP1580HS –LF–Z)
8
7
6
5
SYNC
EN
COMP
FB
BS
IN
SW
GND
1
2
3
4
TOP VIEW
MP1580_PD02-PDIP8
Part Number** Package Temperature
MP1580HP PDIP8
–40°C to +125°C
**
For Tape & Reel, add suffix –Z (eg. MP1580HP–Z)
For Lead Free, add suffix –LF (eg. MP1580HP –LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage (V
IN
)..................................... 27V
Switch Voltage (V
SW
).................. –1V to V
IN
+ 1V
Bootstrap Voltage (V
BS
) ....................... V
SW
+ 6V
Feedback Voltage (V
FB
) .................–0.3V to +6V
Enable/UVLO Voltage (V
EN
)...........–0.3V to +6V
Comp Voltage (V
COMP
) ...................–0.3V to +6V
Sync Voltage (V
SYNC
)......................–0.3V to +6V
Junction Temperature.............................+150°C
Lead Temperature ..................................+260°C
Storage Temperature.............. –65°C to +150°C
Recommended Operating Conditions
(2)
Input Voltage (V
IN
) ......................... 4.75V to 25V
Operating Temperature...............–40°C to +125°C
Thermal Resistance
(3)
θ
JA
θ
JC
SOIC8.................................... 105 ..... 50... °C/W
PDIP8 ..................................... 95 ...... 55... °C/W
Notes:
1) Exceeding these 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 otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Feedback Voltage
4.75V ≤ V
IN
≤ 25V
V
COMP
< 2V
1.198 1.222 1.246 V
Upper Switch-On Resistance 0.18
Lower Switch-On Resistance 10
Upper Switch Leakage V
EN
= 0V, V
SW
= 0V 0 10 A
Current Limit
(4)
2.4 3.0 3.6 A
Current Limit Gain.
Output Current to Comp Pin Voltage
1.95 A/V
Error Amplifier Voltage Gain 400 V/V
Error Amplifier Transconductance
ΔI
C
= ±10A
500 770 1100 µA/V
Oscillator Frequency 342 380 418 KHz
Short Circuit Frequency V
FB
= 0V 20 35 54 KHz
Sync Frequency Sync Drive 0V to 2.7V 445 600 KHz
MP1580 – 2A, 380KHz STEP-DOWN CONVERTER
MP1580 Rev. 3.0 www.MonolithicPower.com 3
10/10/2007 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2007 MPS. All Rights Reserved.
TM
ELECTRICAL CHARACTERISTICS (continued)
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameter Symbol Condition Min Typ Max Units
Maximum Duty Cycle V
FB
= 1.0V 90 %
Minimum Duty Cycle V
FB
= 1.5V 0 %
EN Shutdown Threshold Voltage I
CC
> 100A 0.7 1.0 1.3 V
Enable Pull-Up Current V
EN
= 0V 1.15 1.46 1.8 A
EN UVLO Threshold Rising V
EN
Rising 2.37 2.495 2.62 V
EN UVLO Threshold Hysteresis 210 mV
Supply Current (Shutdown)
V
EN
≤ 0.4V
23 36 A
Supply Current (Quiescent)
V
EN
≥ 2.6V, V
FB
= 1.4V
1.0 1.2 mA
Thermal Shutdown 160
°C
Note:
4) Derate current limit 0.011A/°C.
PIN FUNCTIONS
Pin # Name Description
1 BS
Bootstrap (C5). This capacitor is needed to drive the power switch’s gate above the
supply voltage. It is connected between SW and BS pins to form a floating supply across
the power switch driver. The voltage across C5 is about 5V and is supplied by the internal
+5V supply when the SW pin voltage is low.
2 IN
Supply Voltage. The MP1580 operates from a +4.75V to +25V unregulated input. C1 is
needed to prevent large voltage spikes from appearing at the input.
3 SW Switch. This connects the inductor to either IN through M1 or to GND through M2.
4 GND
Ground. This pin is the voltage reference for the regulated output voltage. For this reason
care must be taken in its layout. This node should be placed outside of the D1 to C1
ground path to prevent switching current spikes from inducing voltage noise into the part.
5 FB
Feedback. An external resistor divider from the output to GND, tapped to the FB pin sets
the output voltage. To prevent current limit run away during a short circuit fault condition
the frequency foldback comparator lowers the oscillator frequency when the FB voltage is
below 700mV.
6 COMP
Compensation. This node is the output of the transconductance error amplifier and the
input to the current comparator. Frequency compensation is done at this node by
connecting a series R-C to ground. See the compensation section for exact details.
7 EN
Enable/UVLO. A voltage greater than 2.62V enables operation. For complete low current
shutdown the EN pin voltage needs to be less than 700mV.
8 SYNC
Synchronization Input. This pin is used to synchronize the internal oscillator frequency to
an external source. There is an internal 11k pull down resistor to GND; therefore leave
SYNC unconnected if unused.
P1-P3P4-P6P7-P9P10-P10

MP1580HS-LF-Z

Mfr. #:
Buy MP1580HS-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 2A 380kHz
Lifecycle:
New from this manufacturer.
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