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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 4
11/4/2009 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)
(5)
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
MP38876 – 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38876 Rev. 0.91 www.MonolithicPower.com 5
11/4/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
PIN FUNCTIONS
Pin # Name Description
1 VCC BG Driver Bias Supply. Decouple with a 1µF ceramic capacitor.
2 SYNCOUT
Timing output to drive another MP38876 (or similar device) SYNCIN for phase-shift
operation.
3 SYNCIN External Frequency Synchronization. Connect to V
CC
if not used.
4 EN On/Off Control.
5 SS/TRK Soft-Start/Track Input. Connect a capacitor to ground.
6 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 400mV.
7 COMP Compensation. Connect R/C network to ground.
8 PG
Power Good Indicator. Connect this pin to V
CC
or V
OUT
by a 100k pull-up resistor.
The output of this pin is an open drain if the output voltage is within 10% of the
nominal voltage, otherwise it is LOW. If PG is initially at open drain, there is a 20µs
delay to pull PG if the output voltage is less than 10% regulation window.
9 BST
Bootstrap. 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.
10, 18,
Exposed Pad
VIN
Supply Voltage. The MP38876 operates from a +4.5V to +28V unregulated input. C1
is needed to prevent large voltage spikes from appearing at the input.
11-17 SW Switch Output. These pins are fused together.
19 GATE Gate Driver Output. Connect this pin to the synchronous MOSFET.
20 GND Ground.
MP38876 – 15A, 28V, HIGH FREQUENCY STEP-DOWN WITH SYNCHRONOUS GATE DRIVER
MP38876 Rev. 0.91 www.MonolithicPower.com 6
11/4/2009 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2009 MPS. All Rights Reserved.
TYPICAL PERFORMANCE CHARACTERISTICS
V
IN
=12V, V
OUT
=1.2V, L=0.72uH, T
A
= +25ºC, unless otherwise noted.
Efficiency vs.
Output Current
Load Regulation
50
55
60
65
70
75
80
85
90
95
0 2 4 6 8 10 12 14 16
OUTPUT CURRENT(A)
0.900
0.910
0.920
0.930
0.940
0.950
0.960
0.970
0.980
0.990
1.000
024681012141618202224
LOAD CURRENT(A)
NORMALIZED OUTPUT VOLTAGE (V)
0.998
0.9985
0.999
0.9995
1
1.0005
1.001
5 6 7 8 9 10 11 12 13 14 15 16 17
INPUT VOLTAGE (V)
NORMALIZED OUTPUT VOLTAGE (V)
11
13
15
17
19
21
23
25
0 10203040506070
DUTY CYCLE (%)
PEAK CURRENT (A)
Peak Current vs.
Duty Cycle
4.2
4.4
4.6
4.8
5
5.2
5.4
5.6
INPUT VOLTAGE(V)
Vcc(V)
4 7 10 13 16 19 22 25 28 31
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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