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PDF MP2315 Data sheet ( Hoja de datos )
| Número de pieza | MP2315 | |
| Descripción | Synchronous Step Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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The Future of Analog IC Technology
DESCRIPTION
The MP2315 is a high frequency synchronous
rectified step-down switch mode converter with
built in internal power MOSFETs. It offers a
very compact solution to achieve 3A continuous
output current over a wide input supply range
with excellent load and line regulation. The
MP2315 has synchronous mode operation for
higher efficiency over output current load range.
Current mode operation provides fast transient
response and eases loop stabilization.
Full protection features include OCP and
thermal shut down.
The MP2315 requires a minimum number of
readily available standard external components
and is available in a space saving 8-pin
TSOT23 package.
TYPICAL APPLICATION
MP2315
High Efficiency 3A, 24V, 500kHz
Synchronous Step Down Converter
FEATURES
Wide 4.5V to 24V Operating Input Range
3A Load Current
90mΩ/40mΩ Low Rds(on) Internal Power
MOSFETs
Low Quiescent Current
High Efficiency Synchronous Mode
Operation
Fixed 500kHz Switching Frequency
Frequency Sync from 200kHz to 2MHz
External Clock
AAM Power Save Mode
Internal Soft Start
OCP Protection and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in an 8-pin TSOT-23 package
APPLICATIONS
Notebook Systems and I/O Power
Digital Set Top Boxes
Flat Panel Television and Monitors
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
100
95
90
85
80
75
70
65
60
0.01
0.1
1 10
MP2315 Rev. 1.01
www.MonolithicPower.com
1/8/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
1 page  
MP2315 – 24V, 3A SYNC STEP DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
VIN = 19V, VOUT = 5V, L = 6.5µH, RAAM=75kΩ, TA = 25°C, unless otherwise noted.
Case Temperture Rise
vs. Output Current
VOUT=3.3V, IOUT=0.5 to 3A,
2 Layers PCB, Size: 6.35cm X 4.84cm
50
Case Temperture Rise
vs. Output Current
VOUT=5V, IOUT=0.5 to 3A,
2 Layers PCB, Size: 6.35cm X 4.84cm
60
Disabled Supply Current
vs. Input Voltage
30
40 50
40
30
30
20
20
10 10
25
20
15
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0
0
0 0.5 1.0 1.5 2.0 2.5 3.0
0
0 5 10 15 20 25 30
Feedback Voltage
vs. Temperature
0. 792
0. 791
0. 79
0. 789
0. 788
0. 787
0. 786
-40 -20 0 20 40 60 80 100 120140
MP2315 Rev. 1.01
www.MonolithicPower.com
1/8/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
5 Page 
MP2315 – 24V, 3A SYNC STEP DOWN CONVERTER
about 3.9V while its falling threshold is
consistent 3.25V.
Internal Soft-Start
The soft start is implemented to prevent the
converter output voltage from overshooting
during start up. When the chip starts, the
internal circuitry generates a soft-start voltage
(SS) ramping up from 0V. The soft-start period
lasts until the voltage on the soft-start capacitor
exceeds the reference voltage of 0.8V. At this
point the reference voltage takes over. The soft-
start time is internally set to be around 1.5ms.
Over-Current-Protection and Hiccup
The MP2315 has cycle-by-cycle over current
limit when the inductor current peak value
exceeds the set current limit threshold.
Meanwhile, output voltage starts to drop until
FB is below the Under-Voltage (UV) threshold,
typically 50% below the reference. Once a UV
is triggered, the MP2315 enters hiccup mode to
periodically restart the part. This protection
mode is especially useful when the output is
dead-short to ground. The average short circuit
current is greatly reduced to alleviate the
thermal issue and to protect the regulator. The
MP2315 exits the hiccup mode once the over
current condition is removed.
Thermal Shutdown
Thermal shutdown is implemented to prevent
the chip from operating at exceedingly high
temperatures. When the silicon die temperature
is higher than 150°C, it shuts down the whole
chip. When the temperature is lower than its
lower threshold, typically 130°C, the chip is
enabled again.
Floating Driver and Bootstrap Charging
The floating power MOSFET driver is powered
by an external bootstrap capacitor. This floating
driver has its own UVLO protection. This
UVLO’s rising threshold is 2.2V with a
hysteresis of 150mV. The bootstrap capacitor
voltage is regulated internally by VIN through
D1, R5, C5, L1 and C2 (Figure 3). If (VIN-VSW)
is more than 5V, U2 will regulate M3 to maintain
a 5V BST voltage across C5.
R5
5
Figure 3—Internal Bootstrap Charging
Circuit Startup and Shutdown
If both VIN and EN are higher than their
appropriate thresholds, the chip starts. The
reference block starts first, generating stable
reference voltage and currents, and then the
internal regulator is enabled. The regulator
provides stable supply for the remaining
circuitries.
Three events can shut down the chip: EN low,
VIN low and thermal shutdown. In the shutdown
procedure, the signaling path is first blocked to
avoid any fault triggering. The COMP voltage
and the internal supply rail are then pulled down.
The floating driver is not subject to this
shutdown command.
MP2315 Rev. 1.01
www.MonolithicPower.com
1/8/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MP2315.PDF ] | |
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