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PDF MAX8566 Data sheet ( Hoja de datos )
| Número de pieza | MAX8566 | |
| Descripción | PWM Internal-Switch Step-Down Regulator | |
| Fabricantes | Maxim Integrated Products | |
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19-3690; Rev 0; 6/05
EVAALVUAAILTAIOBNLEKIT
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
General Description
The MAX8566 high-efficiency switching regulator deliv-
ers up to 10A load current at output voltages from 0.6V
to (0.87 x VIN). The IC operates from 2.3V to 3.6V input
supplies, making it ideal for point-of-load applications.
The total output-voltage set error is less than ±1% over
load, line, and temperature.
The MAX8566 operates in pulse-width-modulation
(PWM) mode with a 250kHz to 2.4MHz switching fre-
quency range that is programmable by an external
resistor. The IC can be synchronized to an external
clock in the same frequency range using the SYNC
input. The high operating frequency minimizes the size
of external components. Using low-RDS(ON) n-channel
MOSFETs for both high- and low-side switches main-
tains high efficiency at both heavy-load and high-
switching frequencies.
The MAX8566 employs a voltage-mode control archi-
tecture with a high-bandwidth (> 10MHz) error amplifi-
er. The voltage-mode control architecture makes
switching frequencies greater than 1MHz possible,
achieving all-ceramic-capacitor designs to minimize PC
board space. The error amplifier works with Type 3
compensation to fully utilize the bandwidth of the high-
frequency switching to obtain fast transient response.
Adjustable soft-start time provides flexibility to minimize
input startup inrush current. An open-drain, power-
good (PWRGD) signal goes high when the output
reaches 90% of its regulation point.
The MAX8566 provides a SYNCOUT output to synchro-
nize a second MAX8566 or a second regulator switch-
ing 180° out-of-phase with the first to reduce the input
ripple current, which consequently reduces the input-
capacitance requirements. The MAX8566 also pro-
vides an external reference input (REFIN) for
output-tracking applications.
The MAX8566 is available in a 32-pin, 5mm x 5mm thin
QFN package. The MAX8566 and all the required exter-
nal components fit into a footprint of less than 0.80in2.
Applications
ASIC/CPU/DSP Core Voltages
POL Power Supplies
DDR Power Supplies
Base-Station Power Supplies
Fiber Power Supplies
Telecom Power Supplies
Network Power Supplies
Features
♦ Internal 8mΩ On-Resistance MOSFETs
♦ 10A Output PWM Step-Down Regulator
♦ ±1% Output Accuracy over Load, Line, and
Temperature
♦ Operates from 2.3V to 3.6V Input Supply
♦ Adjustable Output from 0.6V to (0.87 x VIN)
♦ 250kHz to 2.4MHz Adjustable Frequency or SYNC
Input
♦ Allows All-Ceramic-Capacitor Design
♦ SYNCOUT Drives 2nd Regulator 180° Out-of-Phase
♦ Prebiased or Monotonic Soft-Start
♦ Programmable Soft-Start Time
♦ Output Tracking or Sequencing
♦ Sourcing and Sinking Output Current
♦ Power-Good Output
♦ 32-Lead Thin QFN Package
♦ REFIN for DDR-Termination Application
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX8566ETJ+ -40°C to +85°C 32 Thin QFN 5mm x 5mm
(T3255-4)
+Denotes lead-free package.
Typical Operating Circuit
INPUT
2.25V TO 3.6V
REFIN FOR
TRACKING
SYSTEM
ENABLE
SYNC INPUT
PROGRAMMABLE
FREQUENCY
SYNC OUTPUT 180°
MONOTONIC SS
SELECTION
POWER-GOOD
OUTPUT
REFIN
SS
EN
SYNC
FREQ
SYNCOUT
MAX8566ETJ+
STEP-DOWN REGULATOR
TQFN 5mm x 5mm
GND
FB
PGND
PGND
PGND
PGND
LX
LX
LX
LX
L1
330nH/10A
OUTPUT
UP TO 10A
C5
2 x 22µF
6.3V
COMPENSATION
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
ELECTRICAL CHARACTERISTICS
(VIN = VDD = VEN = 3.3V, VFB = 0.5V, VSYNC = 0V, TA = -40°C to +85°C, unless otherwise noted. Note 2)
PARAMETER
IN/VDD
IN and VDD Voltage Range
LSS Voltage Range
IN Supply Current
VDD Supply Current
VDD Undervoltage-Lockout
Threshold
COMP
Clamp Voltage, High
Slew Rate
Shutdown Resistance
ERROR AMPLIFIER
FB Regulation Voltage
CONDITIONS
Quiescent current, VFB = 0.7V
Quiescent current, VFB = 0.7V
LX starts/stops switching,
2µs rising/falling-edge delay
VDD rising
VDD falling
VIN = 2.3V to 3.6V, VFB = 0.7V
From COMP to GND, VEN = 0V
VCOMP = 1V to 2V, VIN = 2.3V or 3.6V
MIN TYP
2.325
2.325
1.72
1.80
0.75
0.591
Error-Amplifier Common-Mode
Input Range
VDD = 2.325V to 2.6V
VDD = 2.6V to 3.6V
0
0
Error-Amplifier Maximum Output
Current
0.8
REFIN Common-Mode Range
LX (ALL PINS COMBINED)
On-Resistance, High Side
On-Resistance, Low Side
Current-Limit Threshold
VDD = 2.325V to 2.5V
VDD = 2.6V to 3.6V
ILX = -2A
ILX = 2A
VIN = 2.5V or 3.3V
0
0
VIN = VBST - VLX = 3.3V
VIN = VBST - VLX = 2.5V
VIN = VLSS = 3.3V
VIN = VLSS = 2.5V
12
MAX UNITS
3.600
3.600
2.2
4
2.2
V
V
mA
mA
V
2.18 V
V/µs
100 Ω
0.609
VDD -
1.65
VDD -
1.7
VDD -
1.65
VDD -
1.7
V
V
mA
V
16
mΩ
20
15
mΩ
20
20 A
_______________________________________________________________________________________ 5
5 Page 
PIN
1
2
3
4
5–12
13–17
18–22
23
24
25
26
27
28
29
30
31
32
—
High-Efficiency, 10A, PWM
Internal-Switch Step-Down Regulator
Pin Description
NAME
MODE
FUNCTION
Monotonic Startup Enable/Disable. Connect MODE to GND or to the center tap of an external resistor-
divider to enable/disable monotonic startup mode.
COMP
Error-Amplifier Output. Connect the necessary compensation network from COMP to FB. COMP is
internally pulled to GND when the IC is in shutdown mode.
PWRGD
Power-Good Output. Open-drain output that is high impedance when VFB ≥ 90% of 0.6V. Otherwise,
PWRGD is internally pulled low. PWRGD is internally pulled low when the IC is in shutdown mode,
VDD is below the UVLO threshold, or the IC is in thermal shutdown.
BST
High-Side MOSFET Driver Supply. Bypass BST to LX with a 0.1µF capacitor. BST is connected to LSS
through an internal pMOS switch.
LX Inductor Connection. All LX pins are internally connected together. Connect all LX pins to the
switched side of the inductor. LX is high impedance when the IC is in shutdown mode.
PGND
Power Ground. All PGND pins are internally connected. Connect all PGND pins externally to the
power ground plane.
IN
Input Power Supply. All IN pins are internally connected. Connect all IN pins externally to an input
supply from 2.3V to 3.6V. Bypass IN to PGND with 20µF of ceramic capacitance.
LSS Low-Side MOSFET-Driver Supply Voltage. Connect to a 2.3V to 3.6V supply voltage.
VDD
IC Supply Voltage Input. Connect VDD to IN through an external 2Ω resistor. Bypass VDD to GND with
a 4.7µF capacitor.
REFIN
External Reference Input. Connect to an external reference. FB regulates to the voltage at REFIN.
Connect REFIN to SS to use the internal reference.
SS
Soft-Start Input. Connect a capacitor from SS to GND to set the soft-start time. See the Soft-Start
section.
EN
Enable Input. Active-high logic input to enable/disable the MAX8566. Connect to IN to enable the IC;
connect to GND to disable the IC.
SYNC
Synchronization Input. Synchronize to an external clock with a frequency of 250kHz to 2.4MHz. Leave
SYNC unconnected to disable the synchronization function.
FREQ
Oscillator Frequency Selection. Connect a resistor from FREQ to GND to select the switching
frequency. See the Frequency Select section.
SYNCOUT
GND
FB
EP
Oscillator Output. The SYNCOUT output is 180° out-of-phase from the internal oscillator or the SYNC signal
to facilitate running a second regulator 180° out-of-phase with the first to reduce input ripple current.
Analog Circuit Ground
Feedback Input. Connect to the center tap of an external resistor-divider from the output to GND to
set the output voltage.
Exposed Paddle. Connect to a large ground plane for increased thermal performance.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet MAX8566.PDF ] | |
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