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MP38873DL-LF-Z

P1-P3P4-P6P7-P9P10-P12P13-P14
MP38873
15A, 16V, High Frequency Step-Down
Converter with Synchronous Gate Driver
MP38873 Rev. 0.9 www.MonolithicPower.com 1
9/17/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP38873 is a monolithic step-down switch
mode converter with a built in internal power
MOSFET. It achieves 15A 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.
The MP38873 requires a minimum number of
readily available standard external components
and is available in a 20-pin 3mm x 4mm QFN
package.
The MP38873 is ideal for a wide range of
applications including distributed power systems,
pre-regulator for linear regulators, compact DC-
DC regulators for PCB space limited platforms.
FEATURES
• Wide 4.5V to 16V Operating Input Range
• 15A Output Current
• 25m Internal Power MOSFET Switch
• Synchronous Gate Driver
• Synch from 300KHz to > 1MHz External Clock or
400KHz Fixed Switching Frequency
• Synch Output to Drive Another Regulator in
Phase-Shift Operation
• Feedback Voltage Accuracy: 2%
• Programmable Soft-Start
• Startup Tracking
• EN and Power Good for Power Sequencing
• Cycle-by-Cycle Over Current Protection
• Thermal Shutdown
• Output Adjustable from 0.8V to 12V
• Stable with Low ESR Output Ceramic
Capacitors
• Available in a 3mm x 4mm QFN Package
APPLICATIONS
• Distributed Power Systems
• Pre-Regulator for Linear Regulators
• Compact DC-DC Regulator for PCB Space
Limited Platforms
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
MP38873
SW
BG
FB
BST
GND
IN
VCC
COMP
PG
EN
V
OUT
1.2V/15A
V
IN
OFF ON
V
CC
R3
C3
M2
C6
System
SS/TRK
SYNCIN
SYNCOUT
Efficiency vs. Output Current
V
IN
=12V,V
OUT
=1.2V
50
55
60
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16
OUTPUT CURRENT(A)
EFFICIENCY (%)
MP38873 – 15A, 16V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38873 Rev. 0.9 www.MonolithicPower.com 2
9/17/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
PACKAGE REFERENCE
TOP VIEW
PIN 1 ID
1
2
3
4
5
6
7
VCC
SYNCOUT
SYNCIN
EN
SS/TRK
FB
COMP
17
16
15
14
13
12
11
SWVIN
PG BST VIN
GND GATE VIN
8910
20 19 18
Part Number* Package
MP38873DL
3mm x 4mm QFN20
Temperature Top Marking
–40°C to +85°C
38873
*
For Tape & Reel, add suffix –Z (e.g. MP38873DL–Z)
For RoHS compliant packaging, add suffix –LF
(e.g. MP38873DL–LF–Z)
ABSOLUTE MAXIMUM RATINGS
(1)
Supply Voltage V
IN
....................................... 18V
V
SW
....................... –0.3V (-5V for < 10ns) to 19V
V
BS
....................................................... V
SW
+ 6V
All Other Pins................................. –0.3V to +6V
Junction Temperature...............................150°C
Lead Temperature ....................................260°C
Storage Temperature ..............–65°C to +150°C
Recommended Operating Conditions
(2)
Supply Voltage V
IN
........................... 4.5V to 16V
Output Voltage V
OUT
................... 0.8V to V
IN
-4V
Operating Temperature .............–40°C to +85°C
Thermal Resistance
(3)
θ
JA
θ
JC
QFN20 (3mm x 4mm) ............. 48 ...... 11... °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 JESD51-7, 4-layer PCB.
ELECTRICAL CHARACTERISTICS
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameters Symbol Condition Min Typ Max Units
Feedback Voltage V
FB
4.5V ≤ V
IN
≤ 16V
0.794 0.810 0.826 V
Feedback Current I
FB
V
FB
= 0.8V 10 nA
Switch On Resistance
(4)
R
DS(ON)
25 m
Switch Leakage V
EN
= 0V, V
SW
= 0V 0.1 10 A
Current Limit
(4)
21 A
Oscillator Frequency f
SW
V
FB
= 0.6V, SYNC
IN
= 5V 400 KHz
Fold-back Frequency V
FB
= 0V 100 KHz
Maximum Duty Cycle V
FB
= 0.6V 90 %
Minimum On Time
(4)
t
ON
100 ns
Soft-Start Charging Current I
SS
V
SS
= 0V 8 A
Maximum COMP Level V
COMP_MAX
V
FB
= 0.6V 4.4 V
Gain of Error Amplifier G
EA
V
COMP
= 1.5V 2 mA/V
Error Amplifier Sink Current V
COMP
= 1.5V –270 A
Error Amplifier Source Current V
COMP
= 1.5V +270 A
Power Good Ramp Up Threshold 90 %
Power Good Ramp Down Threshold 85 %
MP38873 – 15A, 16V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38873 Rev. 0.9 www.MonolithicPower.com 3
9/17/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
ELECTRICAL CHARACTERISTICS (continued)
V
IN
= 12V, T
A
= +25°C, unless otherwise noted.
Parameters Symbol Condition Min Typ Max Units
Power Good Delay 20 s
Power Good Sink Current Capability V
PG
Sink 4mA 0.4 V
Power Good Leakage Current I
PG_LEAK
V
PG
= 3.3V 10 nA
V
CC
Tolerance V
CC
I
CC
= 0mA 5.3 V
V
CC
Regulation I
CC
= 0~20mA 5 %
Sync Frequency F
SYNC
0.3 1 MHz
SYNCIN Bias Current I
SYNCIN
10 nA
SYNCIN Logic High Voltage 2 V
SYNCIN Logic Low Voltage 0.4 V
SYNCHOUT High Level
V
CC
= 5V, Source
5mA
4.6 V
SYNCHOUT Low Level V
CC
= 5V, Sink 5mA 0.4 V
Under Voltage Lockout Threshold Rising 3.85 4.1 4.35 V
Under Voltage Lockout Threshold Hysteresis 900 mV
EN Input Low Voltage 0.4 V
En Input High Voltage 2 V
V
EN
= 2V 2
EN Input Current
V
EN
= 0V 0.1
A
Supply Current (Shutdown) V
EN
= 0V 0.1 A
Supply Current (Quiescent) V
EN
= 2V, V
FB
= 1V 1.0 mA
Thermal Shutdown 150 °C
Gate Driver Sink Impedance R
SINK
1
Gate Driver Source Impedance R
SOURCE
4
Gate Drive Current Sense Trip Threshold 20 mV
T
d1
From BG low to SW
high
10 ns
Gate Drive Non-Overlap Time
(see Figure 1)
(4)
T
d2
From SW low to BG
high
10 ns
.
V
BG
1V
T
d1
T
d2
1V
1V
1V
V
SW
Figure 1—Gate Drive Non-Overlap Time Diagram
P1-P3P4-P6P7-P9P10-P12P13-P14

MP38873DL-LF-Z

Mfr. #:
Buy MP38873DL-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 15A 16V 400kHz Step Dwn w/Sync Gate Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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