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PDF MP1499 Data sheet ( Hoja de datos )
| Número de pieza | MP1499 | |
| Descripción | High-Efficiency 5A Peak 16V 500kHz Synchronous Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP1499 (archivo pdf) en la parte inferior de esta página. Total 18 Páginas | ||
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MP1499
The Future of Analog IC Technology
High Efficiency 5A Peak, 16V, 500kHz
Synchronous Step Down Converter
DESCRIPTION
The MP149 9 is a high frequency synchronous
rectified step-down switch mode co nverter with
built in inte rnal power MOSFETs. It offers a
very co mpact solutio n to achieve 5A peak
output curre nt over a wide input su pply range
with excellent load and line regulation. The
MP1499 ha s synchronous mode operation fo r
higher efficiency over output current load range.
Current mo de operatio n provides f ast transien t
response and eases loop stabilization.
Full protection features include o ver current
protection and thermal shut down.
The MP149 9 requires a minimu m number of
readily available standa rd external components
and is available in a sp ace saving 10-pin QFN
(2x3mm) package.
FEATURES
Wide 4.5V to 16V Operating Input Range
70m Ω/25mΩ Low RDS(ON) Internal Power
MOSFETs
Proprietary Switching Loss Reduction
Technique
Fixed 500kHz Switching Frequency
Sync from 200kHz to 2MHz External Clock
AAM Power Save Mode
External Soft Start
OCP Protection and Hiccup
Thermal Shutdown
Output Adjustable from 0.8V
Available in a QFN10 (2x3mm) Package
APPLICATIONS
Digital Set Top Boxes
Flat Panel Television and Monitors
Distributed Power Systems
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.
TYPICAL APPLICATION
R5
10
VIN
C1
22
9
4
C4
100nF
IN BST
L1
3 EN/SYNC
SW 8
3.3
R3
100k
MP1499
R8
10 SS
FB 1 33k
R1
40.2k
C5
22nF
VCC NC GND
C6 2 5 6, 7
R2
13k
VOUT
3.3V/5A
C2
47
Efficiency vs.
Output Current
100VOUT=3.3V
95
90
85
80
VIN=12V
VIN=5V
75
70
65 VIN=16V
60
55
50
0.01 0.10 1.00 10.00
OUTPUT CURRENT(A)
MP1499 Rev. 1.0
7/26/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
1
http://www.Datasheet4U.com
1 page  
MP1499 – 16V/5A PEAK SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Performance waveforms are tested on the evaluation board of the Design Example section.
VIN = 12V, VOUT = 3.3V, L = 3.3µH, TA = 25°C, unless otherwise noted.
100
95
90
85
80
75
70
65
60
55
500.0
VIN=5V
VIN=12V
VIN=16V
1.0 2.0 3.0 4.0
OUTPUT CURRENT (A)
5.0
100
95
90
85
80
75
70
65
60
55
50
0.0
VIN=12V
VIN=16V
VIN=5V
1.0 2.0 3.0 4.0 5.0
OUTPUT CURRENT (A)
Case Temperature Rise
vs. Output Current
VIN=5V, IOUT=0A-5A, 4 layers PCB,
Size: 6.5cmx6.5cm
80
70
60
50 VOUT=3.3V
40
30
20 VOUT=1.2V
10
0
012
34
OUTPUT CURRENT (A)
5
100
95
90
85
80
75
70
65
60
55
500.0
VIN=12V
VIN=16V
VIN=5V
1.0 2.0 3.0 4.0 5.0
OUTPUT CURRENT (A)
100
95
90
85
VIN=12V
80 VIN=16V
75
VIN=6.5V
70
65
60
55
50
0.0 1.0 2.0 3.0 4.0 5.0
OUTPUT CURRENT (A)
100
95
90
85
80
75
70
65
60
55
50
0.0
VIN=12V
VIN=16V
VIN=5V
1.0 2.0 3.0 4.0 5.0
OUTPUT CURRENT (A)
Case Temperature Rise
vs. Output Current
VIN=12V, IOUT=0A-5A, 4 layers PCB,
Size: 6.5cmx6.5cm
60
50
40 VOUT=3.3V
30
20 VOUT=5V
10 VOUT=1.2V
00 1 2 3 4 5
OUTPUT CURRENT (A)
6
5 VIN=12V
4
3
VIN=5V
2
1
0
0.0 1.0 2.0 3.0 4.0 5.0 6.0
OUTPUT VOLTAGE (V)
6
VOUT=1.8V
5
4
VOUT=3.3V
3
VOUT=5V
2
1
0-40-30-20-10 0 10 20 30 40 50 60 70
MP1499 Rev. 1.0
7/26/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
5
5 Page 
MP1499 – 16V/5A PEAK SYNCHRONOUS STEP-DOWN CONVERTER
Figure 3—Adjustable UVLO
Soft-Start
The MP1 499 employs soft start (SS)
mechanism to ensure smooth output durin g
power-up. When the EN pin becomes high, an
internal curr ent source (11 μA) charges up the
SS capacito r. The SS capacitor v oltage take s
over the REF voltage to the PWM comparator.
The output voltage smo othly ramps up with the
SS voltage. Once the SS voltage reaches the
same level as the REF voltag
e, it keep s
ramping up while V REF takes over the PWM
comparator. At this poin t, the soft start finishes
and it enters into steady state operation.
If the outpu t is pre-bia sed to a cert ain voltage
during start up, the IC will disab le the switchin g
of both high-side and low-side switches until the
voltage on the internal soft-sta rt capacitor
exceeds th e sensed o utput voltage at the FB
pin.
The SS capacitor value can be determined as
follows:
CSS nF
TSS
ms ISS A
VRVEF
(1)
If the output capacitors have large capacitan ce
value, it’s n ot recommended to se t the SS time
too small. Otherwise, it’s easy to hit the current
limit during SS. A minimum valu e of 4.7n F
should be used if the output capacitance value
is larger than 330μF.
Power Save Mode for Light Load Condition
The MP1499 has AAM (Advanced
Asynchronous Modulation) power save mode
for light load. The AAM voltage is set at 0.4V
internally. Under the heavy load condition, the
VCOMP is higher than VAAM. When clock goes
high, the high-side po wer MOSF ET turns o n
and remains on until V ILsense reache s the value
set by the COMP voltage. The internal clock
resets ever y time when V COMP is higher than
VAAM.
Under the light load condition, th e value of
VCOMP is low. When V COMP is less th an VAAM and
VFB is le ss than V REF, V COMP ramp s up until it
exceeds V AAM, during this time, t he internal
clock is b locked, thus t he MP1499 skips some
pulses for PFM (Pulse Frequency Modulation)
mode and achieves the light load power save.
Clock
HS_driver QS
R
VAAM
1pF
50pF 400k
VOUT
R1
VCOMP
-
VFB
+ R2
- VREF
+ VIL sense
Figure 4—Simplified AAM Control Logic
When the load current is light, the inductor peak
current is set internally which is a bout 1A for
VIN=12V, VOUT=3.3V, and L=3.3 μH.The curve of
inductor pe ak current vs. inductor is shown in
Figure 5.
Inductor Peak Current
vs. Inductor
2.5
VOUT=1V
2 VOUT=1.8V
1.5
1 VOUT=2.5V
0.5 VOUT=3.3V
VOUT=5V
0
0123456
Figure5—Inductor Peak Current vs. Inductor
Over-Current-Protection and Hiccup
The MP1499 has cycle-by-cycle over current
limit when the induct or current peak value
MP1499 Rev. 1.0
7/26/2012
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 18 Páginas | |
| PDF Descargar | [ Datasheet MP1499.PDF ] | |
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