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PDF MP2316 Data sheet ( Hoja de datos )
| Número de pieza | MP2316 | |
| Descripción | High-Efficiency Constant On-Time (COT) Step-Down Converter | |
| Fabricantes | MPS | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MP2316 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
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MP2316
19V, 3A, 40uA IQ, High-Efficiency
Constant On-Time (COT) Step-Down
Converter in 2x3mm QFN Package
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - MOUSER ELECTRONICS INTERNAL USE ONLY
DESCRIPTION
The MP2316 is a fully-integrated, high efficiency,
synchronous, step-down switch-mode converter,
featuring only 40μA quiescent current. This very
compact device achieves 3A continuous output
current over a wide input supply range with
excellent load and line regulation, and can
operate with high efficiency over a wide output
current load range. It’s optimized for battery-
operated applications and applications requiring
high light load efficiency.
With Constant On-Time control, the MP2316
provides very fast transient response, easy loop
design as well as very tight output regulation.
Full protection features include SCP, OCP, UVP,
and thermal shutdown.
The MP2316 requires a minimal number of
readily available standard external components
with a space saving 2mmx3mm 14-pin QFN
package.
FEATURES
• 4V to 19V Operating Input Range
• 3A Output Current
• 40μA Quiescent Current
• Output Adjustable from 0.6V
• 90mΩ/30mΩ High Side/Low Side RDS(ON) for
Internal Power MOSFETs
• Power Good Indicator
• Programmable Soft-Start Time
• PWM/PFM Mode Selectable
• Programmable Switching Frequency
• Thermal Shutdown
• Short Circuit Protection: Hiccup Mode
• Available in QFN14 (2mmx3mm) Package
APPLICATIONS
• Tablet PCs
• Solid State Drives
• Gaming
• Battery-operated Applications
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
MP2316 Rev. 1.01
www.MonolithicPower.com
2/19/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
1
2014519443968
1 page  
MP2316 – 19V, 3A LOW IQ STEP DOWN CONVERTER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - MOUSER ELECTRONICS INTERNAL USE ONLY
TYPICAL PERFORMANCE CHARACTORISTICS (continued)
VIN=12V, VOUT=1.2V, L=2.2μH, TA=25oC, unless otherwise noted.
MP2316 Rev. 1.01
www.MonolithicPower.com
2/19/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
5
2014519443968
5 Page 
MP2316 – 19V, 3A LOW IQ STEP DOWN CONVERTER
MPS CONFIDENTIAL AND PROPRIETARY INFORMATION - MOUSER ELECTRONICS INTERNAL USE ONLY
OPERATION
PWM Operation
The MP2316 is a fully-integrated, synchronous,
rectified, step-down switch converter. The device
uses constant-on-time (COT) control to provide
fast transient response and easy loop
stabilization. Figure 2 shows the simplified ramp
compensation block in MP2316, at the beginning
of each cycle, the high-side MOSFET (HS-FET)
turns ON whenever the ramp voltage (VRamp) is
lower than the error amplifier output voltage
(VEAO)—which indicates insufficient output
voltage. The input voltage and the frequency-set
resistor determine the ON period as follows:
( )TON
(ns)
=
12 × Rfreq
VIN(V) −
kΩ
0.4
+TDELAY (ns)
(1)
Where TDELAY is the comparator delay, and
equals approximately 40ns.
After the ON period elapses, the HS-FET enters
the OFF state. By cycling HS-FET between the
ON and OFF states, the converter regulates the
output voltage. The integrated low-side MOSFET
(LS-FET) turns on when the HS-FET is in its OFF
state to minimize the conduction loss.
Shoot-through occurs when there is both HS-FET
and LS-FET are turned on at the same time,
causing a dead short between input and GND.
Shoot-through dramatically reduces efficiency,
and the MP2316 avoids this by internally
generating a dead-time (DT) between when HS-
FET is off and LS-FET is on, LS-FET is off and
HS-FET is on. The device enters either heavy-
load operation or light-load operation depending
on the amplitude of the output current.
REF
FB
RAMP
On Logic
Timer Control
L
SW
RESR
Cr
Cout
CR
VOUT
R1
R2
MODE Selection
As Figure 3 shown, connect a resistor from
FREQ/MODE pin to VIN to set the switching
frequency and at the same time the part will work
at force PWM mode. Connect a resistor to GND
to set the switching frequency and part works at
auto PFM/PWM mode.
VIN
R6 MP2316
(PWM)
FREQ/MODE
R7
(PFM)
Figure 3—Mode Selection
Switching Frequency
MP2316 uses constant-on-time (COT) control
because there is no dedicated oscillator in the IC.
The input voltage is feed-forwarded to the on-
time one-shot timer through the frequency
resistor, the duty ratio is kept as VOUT/VIN, and the
switching frequency is fairly constant over the
input voltage range. The switching frequency can
be determined with the following equation:
FSW (KHz)
=
106
Ton (ns)
×
VIN (V)
VOUT (V)
(2)
Because of the minimum on time and minimum
off time, switching frequency is limited. The
maximum frequency can be calculated by the
following equations, choose the lower value of
them as the maximum frequency:
FSW-max (KHz)
=
106
Ton-min (ns) ×
VIN (V)
VOUT (V)
(3)
FSW-max
(KHz)
=
(VIN(V)-VOUT (V)) ×106
Toff-min(ns) × VIN(V)
(4)
Figure 2—Simplified Ramp Compensation
Block
MP2316 Rev. 1.01
www.MonolithicPower.com
2/19/2014
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2014 MPS. All Rights Reserved.
11
2014519443968
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet MP2316.PDF ] | |
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