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PDF MAX16963 Data sheet ( Hoja de datos )
| Número de pieza | MAX16963 | |
| Descripción | Low-Voltage Step-Down DC-DC Converter | |
| Fabricantes | Maxim Integrated Products | |
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MAX16963
Dual 2.2MHz, Low-Voltage Step-Down
DC-DC Converter
General Description
Benefits and Features
The MAX16963 is a high-efficiency, dual synchronous
step-down converter that operates with a 2.7V to 5.5V
input voltage range and provides a 0.8V to 3.6V output
voltage range. The device delivers up to 1.5A of load
current per output. The low input/output voltage range
and the ability to provide high output currents make this
device ideal for on-board point-of-load and postregulation
applications. The device achieves Q3% output error over
load, line, and temperature ranges.
The device features a 2.2MHz fixed-frequency PWM mode
for better noise immunity and load transient response,
and a skip mode for increased efficiency during light-load
operation. The 2.2MHz frequency operation allows for
an all-ceramic capacitor design and small-size external
components. An optional spread-spectrum frequency
modulation minimizes radiated electromagnetic emissions
due to the switching frequency.
On-board low RDSON switches help minimize efficiency
losses at heavy loads and reduce critical/parasitic induc-
tance, making the layout a much simpler task with respect
to discrete solutions. Following a simple layout and footprint
ensures first-pass success in new designs.
The device is offered in a factory-preset output voltage or
adjustable output-voltage version (see the Selector Guide
for options). Factory-preset output-voltage versions allow
customers to achieve Q3% output-voltage accuracy without
using external resistors, while the adjustable output-voltage
version provides the flexibility to set the output voltage to
any desired value between 0.8V and 3.6V using an external
resistive divider.
Additional features include 8ms fixed soft-start, 16ms
fixed power-good delay, overcurrent, and overtemperature
protections.
The MAX16963 is available in thermally enhanced 16-pin
TSSOP-EP and 4mm x 4mm, 16-pin TQFN-EP packages,
and is specified for operation over the -40NC to +125NC
automotive temperature range.
Applications
S Small Size Components
Dual 2.2MHz DC-DC Converter
S Ideal for Point-of-Load Applications
Up to 1.5A Output Current
Adjustable Output Voltage: 0.8V to 3.6V
2.7V to 5.5V Operating Supply voltage
S High Efficiency at Light Load
Skip Mode with 36µA Quiescent Current
S Low Electromagnetic Emission
Programmable SYNC I/O Pin
Spread Spectrum
S Low Power Mode Saves Energy
Independent Enable Inputs
S Output Rail Monitoring Helps Prevent System Failure
Open-Drain Power-Good Output
S Limits Inrush Current During Startup
Built-In Soft-Start Timer
S Overtemperature and Short-Circuit Protections
S 4mm x 4mm, 16-Pin TQFN and 16-Pin TSSOP
Packages
S -40NC to 125NC Operating Temperature Range
Typical Application Circuit
VPV1
4.7µF
VPV2
4.7µF
VPV
10Ω
1µF
VOUT1
PV1
EN1
PV2
EN2
PV
GND
OUTS1
LX1
PGND1
OUTS2
LX2
PGND2
2.2µH
VOUT1
22µF
1.5µH
VOUT2
22µF
VOUT2
Automotive Postregulation
Industrial/Military
Point-of-Load Applications
Ordering Information appears at end of data sheet.
20kΩ
MAX16963
PG2 EP PG1
20kΩ
For related parts and recommended products to use with this part, refer to: www.maximintegrated.com/MAX16963.related
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-6487; Rev 4; 4/14
1 page  
MAX16963
Dual 2.2MHz, Low-Voltage Step-Down
DC-DC Converter
Typical Operating Characteristics
(VPV = VPV1 = 5V, VEN1 = VEN2 = 5V, VOUT1 = 3.3V, VOUT2 = 1.8V, TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
100
90
80 SKIP
70
60
PWM
50
40
30
20
10
0
0.001
VIN = 5V
0.01 0.1
1
LOAD CURRENT (A)
10
EFFICIENCY vs. LOAD CURRENT
(VOUT = 1.8V)
100
90
80
70 SKIP
60
PWM
50
40
30
20
10
0
0.001
VIN = 5V
0.01 0.1
1
LOAD CURRENT (A)
10
VOUT LOAD REGULATION (PWM)
0
VIN = 5V
-0.5 VOUT = 3.3V
TA = +125°C
-1.0
-1.5 TA = -40°C
-2.0 TA = +25°C
-2.5
-3.0
0
0.25 0.50 0.75 1.00 1.25 1.50
ILOAD (A)
VOUT1 LOAD REGULATION (SKIP)
1.5
VIN = 5V
1.0 VOUT = 3.3V
0.5
0
-0.5 TA = +125°C
-1.0
-1.5 TA = -40°C
-2.0
-2.5
-3.0
0
TA = +25°C
0.25 0.50 0.75 1.00 1.25 1.50
ILOAD (A)
VOUT LINE REGULATION (PWM)
0
-0.05
VOUT = 1.8V
ILOAD = 0.75A
-0.10
-0.15
TA = -40°C
-0.20
TA = +25°C
-0.25
-0.30
TA = +125°C
-0.35
-0.40
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VPV (V)
IPV vs. VPV (SKIP)
70
VPWM = 0V
60
VEN1 = VEN2 = VPV
VOUT1 = VOUT2 = 0.8V
50 TA = +125°C
40
TA = +25°C
30
20
TA = -40°C
10
2.5 3.0 3.5 4.0 4.5 5.0 5.5
VPV (V)
IPV vs. TEMPERATURE (SKIP)
50
VPV = 5V
45
VPWM = 0V
VEN1 = VEN2 = VPV
VOUT1 = VOUT2 = 0.8
40
LOAD-TRANSIENT RESPONSE (PWM)
MAX16963 toc08
1.5A
35
ILOAD
0.15A
0A
30 VOUT
AC-COUPLED
25 50mv/div
20
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
VOUT = 3.3V
100µs/div
fSW vs. TEMPERATURE
2.20
2.18
VIN = 5V
PWM MODE
2.16 ILOAD = 0A
2.14
2.12
2.10
2.08
2.06
2.04
2.02
2.00
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
Maxim Integrated
5
5 Page 
MAX16963
Dual 2.2MHz, Low-Voltage Step-Down
DC-DC Converter
Output Capacitor
The minimum capacitor required depends on output
voltage, maximum device current capability, and the
error amplifier voltage gain. Use the following formula to
determine the required output capacitor value:
C OUT
(MIN)
=
VREF
2π
x
×
GCS x GEAMP
fCO × VOUT
where VREF is the reference voltage equal to 1.25V, fCO
is the target crossover frequency equal to 250kHz, and
GEAMP is the error amplifier voltage gain equal to 40V/V.
GCS is the internal current-sense conductance; see the
Selector Guide for the value for each specific part number.
Table 2 lists some of the inductor values for 1.5A output
current and several output voltages.
For proper functionality, ceramic capacitors must be
used. Make sure that the self-resonance of the ceramic
capacitors at the converters’ output converter is above
1MHz to avoid converter instability.
PCB Layout Guidelines
Careful PCB layout is critical to achieve low switching
losses and clean, stable operation. Use a multilayer
board whenever possible for better noise immunity and
power dissipation. Follow these guidelines for good PCB
layout:
1) Use a large contiguous copper plane under the
MAX16963 package. Ensure that all heat-dissipating
components have adequate cooling. The bottom
pad of the MAX16963 must be soldered down to
this copper plane for effective heat dissipation and
maximizing the full power out of the MAX16963. Use
multiple vias or a single large via in this plane for
heat dissipation.
2) Isolate the power components and high current path
from the sensitive analog circuitry. This is essential to
prevent any noise coupling into the analog signals.
3) Add small footprint blocking capacitors with low self-
resonance frequency close to PV1, PV2, and PV.
4) Keep the high-current paths short, especially at the
ground terminals. This practice is essential for stable,
jitter-free operation. The high current path composed
of input capacitors at PV1 and PV2, inductor, and the
output capacitor should be as short as possible.
5) Keep the power traces and load connections short.
This practice is essential for high efficiency. Use
thick copper PCBs (2oz vs. 1oz) to enhance full-load
efficiency.
6) OUTS_ are sensitive to noise for devices with external
feedback option. The resistive network, R1, R2, and
C1 must be placed close to OUTS_ and far away from
the LX_ node and high switching current paths. The
ground node of R2 must be close to GND.
7) The ground connection for the analog and power
section should be close to the IC. This keeps the
ground current loops to a minimum. In cases where
only one ground is used enough isolation between
analog return signals and high power signals must
be maintained.
Maxim Integrated
11
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| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet MAX16963.PDF ] | |
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