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PDF MP8606 Data sheet ( Hoja de datos )
| Número de pieza | MP8606 | |
| Descripción | Synchronous Step-Down Converter | |
| Fabricantes | MPS | |
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MP8606
6A, 6.5V, Fast-Transient, Synchronous
Step-Down Converter
DESCRIPTION
The MP8606 is a fully-integrated, high-
frequency, synchronous, rectified step-down
switch-mode converter. It offers a very compact
solution to achieve 6A of continuous output
current from a 2.9V-to-6.5V input with excellent
load and line regulation.
The advanced PWM scheme provides fast
transient response and eases loop stabilization.
The MP8606 integrates a 14mΩ high-side
switch and an 8mΩ low-side synchronous
switch for high efficiency without an external
Schottky diode. Fault protections include peak
current limiting, hiccup over-current protection,
and thermal shutdown. It also has a power-
good output.
The MP8606 requires a minimal number of
readily available standard external components
and is available in a 3mmx4mm flip-chip QFN
package.
TYPICAL APPLICATION
FEATURES
6A Continuous Output Current
14mΩ Internal High-Side Power Switches
8mΩ Internal Low-Side Power Switches
Input Operation Range: 2.9V to 6.5V
Adjustable Output Down to 0.6V
Programmable Switching Frequency
Hiccup Over-Current Protection
Programmable Soft-Start Time
Thermal Shutdown
Power-Good Output
3mmx4mm Flip-Chip Package
APPLICATIONS
µP/ASIC/DSP/FPGA Core and I/O Supplies
Portable Equipment / Notebook Computers
Network and Telecom Equipment
Point of Load Regulators
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.
MP8606 Rev. 1.03
www.MonolithicPower.com
8/2/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
1
1 page  
MP8606 – 6A, 6.5V SYNCHRONOUS STEP-DOWN CONVERTER
TYPICAL PERFORMANCE CHARACTERISTICS
VIN=5V, VOUT =1V, FS=1MHz, TA=+25°C, unless otherwise noted.
MP8606 Rev. 1.03
www.MonolithicPower.com
8/2/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
5
5 Page 
MP8606 – 6A, 6.5V SYNCHRONOUS STEP-DOWN CONVERTER
RAMP Compensation
Jitter occurs in both PWM and skip modes when
noise in the VFB ripple propagates a delay to the
HS-FET driver, as shown in Figures 5 and 6.
Jitter can affect system stability, with noise
immunity proportional to the steepness of VFB’s
downward slope. However, VFB ripple does not
directly affect noise immunity.
Figure 4—
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 with a rising
threshold of 1.4V and a hysteresis of 150mV.
The bootstrap capacitor is charges from VCC
through N1 (Fig. 4). N1 turns on when the LS-
FET turns on and turns off when the LS-FET
turns off. A schottky diode is recommended to be
placed between VCC and BST to help maintain
BST voltage at light load operation.
Switching Frequency
MP8606 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 resistor R7. 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
5.8 R7(k)
VIN(V) 0.4
VIN(V)
VOUT (V)
TDELAY
(ns)
(3)
Where TDELAY is the comparator delay, and
equals approximately 40ns.
MP8606 is optimized to operate at high switching
frequency with high efficiency. High switching
frequency makes it possible to use small-sized
LC filter components to save system PCB space.
Figure 5—Jitter in PWM Mode
Figure 6—Jitter in Skip Mode
When using ceramic output capacitors, the ESR
ripple is not sufficient to stabilize the system, and
the system requires external ramp compensation.
Figure 7—Simplified Circuit in PWM Mode
with External Ramp Compensation
MP8606 Rev. 1.03
www.MonolithicPower.com
8/2/2013
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MP8606.PDF ] | |
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