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MP38876DL-LF-Z

P1-P3P4-P6P7-P9P10-P12P13-P15
MP38876 – 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38876 Rev. 0.91 www.MonolithicPower.com 13
11/4/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
Bottom Layer
Figure 4—PCB Layout
External Bootstrap Diode
An external bootstrap diode may enhance the
efficiency of the regulator. The applicable
conditions of external BST diode are:
z V
OUT
=5V or 3.3V; and
z Duty cycle is high: D=
IN
OUT
V
V
>65%
In these cases, an external BST diode is
recommended from the output of the voltage
regulator to BST pin, as shown in Figure.5
MP38876
SW
BST
C
L
BST
C
5V or 3.3V
OUT
External BST Diode
IN4148
+
Figure 5—Add Optional External Bootstrap
Diode to Enhance Efficiency
The recommended external BST diode is
IN4148, and the BST cap is 0.1~1µF.
Output Voltage Tracking and Sequencing
The MP38876 allows the user to program how
its output voltage ramps during startup by
means of the SS pin. Through this pin, the
output voltage can be set to either
coincidentally or rationally track another output
voltage, as shown below.
OUTPUT VOLTAGE
MP38876
FB
SW
SS
L
1
R
1
R
1
R
2
V
OUT2
R
2
V
OUT2
V
OUT2
V
OUT1
V
OUT1
C
OUT1
V
OUT1
MP38876
FB
SW
SS
L
2
R
3
R
4
R
2
= R
4
(a) Coincidentally Tracking (a) Rationally Tracking
R
3
> R
1
C
OUT2
V
OUT2
MP38876
FB
SW
SS
L
1
R
1
R
2
C
OUT1
V
OUT1
MP38876
FB
SW
SS
L
2
R
3
R
4
R
2
= R
4
R
3
> R
1
C
OUT2
V
OUT2
Figure 6—Output Voltage Tracking
MP38876 – 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38876 Rev. 0.91 www.MonolithicPower.com 14
11/4/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
Two Phase Operation
The MP38876 can be configured as a two-phase
interleaving regulator to provide up to 30A load
current. The current balance is automatically
achieved by connecting the two COMP pins
together. See Figure 7 for detail configurations.
MP38876
MP38876
R14
100k
R5
6.8k
R10
51
R13
51
R1
6.19k
R2
12.7k
R4
10
R8
100k
R3
100k
VIN
TRACK
C12
470uF
C1
22uF
C2
22uF
C5
0.1uF
C10
47uF
6.3V
C11
330uF
2V
C7
2.2nF
C8
150pF
C6
150pF
C4
1uF
C3
0.1uF
C9
10nF
PG
GND
VOUT
+
+
EN
U1
GND
FB
COMP
BG
SW
PG
BST
SW
SW
SW
SW
SW
SW
SYNCIN
SYNCOUT
CSS/TRK
VIN
VIN
VCC
L1
0.72uH/35A
M1
Si7336A
N-CH 30V 27A
WE-744325072
17
4
1
10
18
319
7
9
8
6
20
2
5
16
15
14
13
12
11
C5A
0.1uF
C10A
47uF
6.3V
C3A
0.1uF
R19
10
M2
Si7336A
N-CH 30V 27A
L2
0.72uH / 35A
WE-744325072
C11A
330uF
2V
C2A
22uF
C1A
22uF
C4A
0.1uF
VIN
VIN
VCC
U2
EN
SYNCIN
SYNCOUT
CSS/TRK
GND
FB
COMP
BG
SW
BST
PG
SW
SW
SW
SW
SW
SW
18
8
9
17
16
15
14
13
12
11
19
7
6
10
1
4
3
2
5
20
+
Figure 7—Two Phase Operation
MP38876 – 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
NOTICE: The information in this document is subject to change without notice. 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.
MP38876 Rev. 0.91 www.MonolithicPower.com 15
11/4/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
PACKAGE INFORMATION
QFN20 (3mm X 4mm)
SIDE VIEW
TOP VIEW
1
20
10
7
BOTTOM VIEW
2.90
3.10
3.90
4.10
2.40
2.60
0.50
BSC
0.18
0.30
0.80
1.00
0.00
0.05
0.20 REF
PIN 1 ID
MARKING
0.50
0.50
0.25
RECOMMENDED LAND PATTERN
1.10
NOTE:
1) ALL DIMENSIONS ARE IN MILLIMETERS.
2) EXPOSED PADDLE SIZE DOES NOT INCLUDE MOLD FLASH.
3) LEAD COPLANARITY SHALL BE 0.10 MILLIMETER MAX.
4) JEDEC REFERENCE IS MO-220, VARIATION VGED.
5) DRAWING IS NOT TO SCALE.
PIN 1 ID
SEE DETAIL A
2.50
0.70
PIN 1 ID OPTION B
R0.20 TYP.
PIN 1 ID OPTION A
0.20x45º TYP.
DETAIL A
0.30
0.50
PIN 1 ID
INDEX AREA
0.65
0.85
0.65
0.85
18
8
3.90
0.75
0.75
0.50
BSC
0.18
0.30
3.00
BSC
0.25
REF
11
17
0.55
0.50
0.25
P1-P3P4-P6P7-P9P10-P12P13-P15

MP38876DL-LF-Z

Mfr. #:
Buy MP38876DL-LF-Z
Manufacturer:
Monolithic Power Systems (MPS)
Description:
Switching Voltage Regulators 15A 28V 100kHz Step Dwn w/Sync Gate Drvr
Lifecycle:
New from this manufacturer.
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