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MP38870 Datasheet(PDF) 2 Page - Monolithic Power Systems

Part # MP38870
Description  3A, 14V, 600KHz Step-Down Converter with Synchronizable Gate Driver
PDF  10 Pages
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Manufacturer  MPS [Monolithic Power Systems]
Direct Link  http://www.monolithicpower.com
Logo MPS - Monolithic Power Systems

MP38870 Datasheet(HTML) 2 Page - Monolithic Power Systems

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MP38870 – 3A, 14V, 600KHz STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38870 Rev. 1.1
www.MonolithicPower.com
2
10/22/2009
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
PACKAGE REFERENCE
TOP VIEW
FB
PG
EN/SYNC
IN
IN
IN
N/C
1
2
3
4
5
6
7
GND
BG
VCC
BST
SW
SW
SW
14
13
12
11
10
9
8
EXPOSED PAD ON BACKSIDE
CONNECT TO GROND
Part Number*
Package
Temperature
MP38870DL
3x4 QFN14
–40
°C to +85°C
* For Tape & Reel, add suffix –Z (eg. MP38870DL–Z)
For RoHS Compliant Packaging, add suffix –LF
(eg. MP38870DL–LF–Z)
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage VIN....................................... 16V
VSW....................... –0.3V (-5V for < 10ns) to 17V
VBS ....................................................... VSW + 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 VIN........................... 4.5V to 14V
Output Voltage VOUT .................... 0.8V to VIN-3V
Operating Temperature .............–40
°C to +85°C
Thermal Resistance
(3)
θJA
θJC
3x4 QFN14 ............................. 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 approximately 1” square of 1 oz copper.
ELECTRICAL CHARACTERISTICS
VIN = 12V, TA = +25°C, unless otherwise noted.
Parameters
Symbol Condition
Min
Typ
Max
Units
Feedback Voltage
VFB
4.5V
≤ VIN ≤ 14V
0.788
0.808
0.828
V
Feedback Current
IFB
VFB = 0.8V
10
nA
Switch On Resistance
(4)
RDS(ON)
80
mΩ
Switch Leakage
VEN = 0V, VSW = 0V
0
10
μA
Current Limit
(4)
4
A
Oscillator Frequency
fSW
VFB = 0.6V
400
600
800
KHz
Fold-back Frequency
VFB = 0V
60
150
240
KHz
Maximum Duty Cycle
VFB = 0.6V
85
90
%
Minimum On Time
(4)
tON
100
ns
Under Voltage Lockout Threshold Rising
3.9
4.1
4.3
V
Under Voltage Lockout Threshold Hysteresis
880
mV
EN Input Low Voltage
0.4
V
En Input High Voltage
1.2
V
VEN = 2V
2
EN Input Current
VEN = 0V
0
μA
Synchronous Frequency Range (Low)
FSYNC_L
250
300
kHz
Synchronous Frequency Range (High)
FSYNC_H
1.5
MHz
Supply Current (Shutdown)
VEN = 0V
0
10
μA
Supply Current (Quiescent)
VEN = 2V, VFB = 1V
0.9
1.1
mA
Thermal Shutdown
150
°C
BG Driver Bias Supply Voltage
VCC
4.5
5
V
Gate Driver Sink Impedance
(4)
RSINK
1
2
Ω
Gate Driver Source Impedance
(4)
RSOURCE
4
5.5
Ω
Gate Drive Current Sense Trip Threshold
20
mV



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