900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8646 Datasheet

2MHz Step-Down Regulator

No Preview Available !

19-3971; Rev 2; 10/07
6A, 2MHz Step-Down Regulator
with Integrated Switches
General Description
The MAX8646 high-efficiency switching regulator deliv-
ers up to 6A load current at output voltages from 0.6V
to 0.9 x VIN. The IC operates from 2.35V to 3.6V, mak-
ing it ideal for on-board point-of-load and postregula-
tion applications. Total output error is less than ±1%
over load, line, and temperature ranges.
The MAX8646 features fixed-frequency PWM mode
operation with a switching frequency range of 500kHz
to 2MHz set by an external resistor. High-frequency
operation allows for an all-ceramic capacitor design.
The high operating frequency also allows for small-size
external components.
The low-resistance on-chip nMOS switches ensure high
efficiency at heavy loads while minimizing critical induc-
tances, 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 MAX8646 comes with a high bandwidth (> 14MHz)
voltage-error amplifier. The voltage-mode control archi-
tecture and the voltage-error amplifier permit a type III
compensation scheme to be utilized to achieve maxi-
mum loop bandwidth, up to 20% of the switching fre-
quency. High loop bandwidth provides fast transient
response, resulting in less required output capacitance
and allowing for all-ceramic-capacitor designs.
The MAX8646 provides two tri-state logic inputs to
select one of nine preset output voltages. The preset
output voltages allow customers to achieve ±1% out-
put-voltage accuracy without using expensive 0.1%
www.DraetsaiSshtoeerst4.UI.ncoamddition, the output voltage can be set to
any customer value by either using two external resis-
tors at the feedback with 0.6V internal reference or
applying an external reference voltage to the REFIN
input. The MAX8646 offers programmable soft-start
time using one capacitor to reduce input inrush current.
The MAX8646 is available in a lead-free, 24-pin, 4mm x
4mm, thin QFN package.
Applications
POLs
ASIC/CPU/DSP Core and I/O Voltages
DDR Power Supplies
Base-Station Power Supplies
Telecom and Networking Power Supplies
RAID Control Power Supplies
Features
Internal 23mRDS(ON) MOSFETs
Continuous 6A Output Current
±1% Output Accuracy over Load, Line,
and Temperature
Operates from 2.35V to 3.6V Supply
Adjustable Output from 0.6V to (0.9 x VIN)
Soft-Start Reduces Inrush Supply Current
500kHz to 2MHz Adjustable Switching Frequency
Compatible with Ceramic, Polymer, and
Electrolytic Output Capacitors
VID-Selectable Output Voltages
0.6V, 0.7V, 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.0V,
and 2.5V
Fully Protected Against Overcurrent and
Overtemperature
Safe-Start into Prebiased Output
Sink/Source Current in DDR Applications
Lead-Free, 24-Pin, 4mm x 4mm Thin QFN Package
Ordering Information
PART
TEMP
RANGE
PIN-PACKAGE
PKG
CODE
MAX8646ETG+ -40°C to +85°C
+Denotes a lead-free package.
*EP = Exposed pad.
24 Thin QFN-EP*
4mm x 4mm
T2444-4
Typical Operating Circuit
INPUT
2.4V, 3.6V
IN BST
MAX8646
EN
LX
VDD
OUT
OUTPUT
1.8V, 6A
CTL1
CTL2
FREQ
REFIN
SS
PGND
FB
COMP
VDD
Pin Configuration appears at end of data sheet.
PREBIAS
PWRGD
GND
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8646 Datasheet

2MHz Step-Down Regulator

No Preview Available !

6A, 2MHz Step-Down Regulator
with Integrated Switches
ABSOLUTE MAXIMUM RATINGS
IN, VDD, PWRGD to GND ......................................-0.3V to +4.5V
COMP, FB, REFIN, OUT,
CTL_, EN, SS, FREQ to GND...................-0.3V to (VDD + 0.3V)
LX Current (Note 1) .....................................................-8A to +8A
BST to LX..................................................................-0.3V to +4V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (TA = +70°C)
(derate 27.8mW/°C above +70°C) ..........................2222.2mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: LX has internal clamp diodes to GND and IN. Applications that forward bias these diodes should take care not to exceed
the IC’s package power dissipation limits.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = VDD = 3.3V, VFB = 0.5V, TA = -40°C to +85°C, typical values are at TA = +25°C, circuit of Figure 1, unless otherwise noted.)
(Note 2)
PARAMETER
IN/VDD
IN and VDD Voltage Range
IN Supply Current
VDD Supply Current
Total Shutdown Current from IN
and VDD
VDD Undervoltage Lockout
Threshold
BST
www.DataSheet4U.com
BST Supply Current
PWM COMPARATOR
PWM Comparator Propagation
Delay
COMP
COMP Clamp Voltage, High
COMP Slew Rate
PWM Ramp Amplitude
COMP Shutdown Resistance
ERROR AMPLIFIER
CONDITIONS
fS = 1MHz, no load,
(includes gate-drive current)
fS = 1MHz
VIN = 2.5V
VIN = 3.3V
VIN = 2.5V
VIN = 3.3V
VIN = VDD = VBST - VLX = 3.6V, VEN = 0V
LX starts/stops switching
VDD rising
VDD falling
Deglitching
VBST = VDD = VIN = 3.6V,
VLX = 3.6V or 0V, VEN = 0V
TA = +25°C
TA = +85°C
10mV overdrive
VIN = 2.35V to 3.6V
From COMP to GND, VEN = VSS = 0V
Preset Output-Voltage Accuracy REFIN = SS
FB Regulation Accuracy Using
External Resistors
FB to OUT Resistor
Open-Loop Voltage Gain
CTL1 = CTL2 = GND
All VID settings except CTL1 = CTL2 = GND
1kfrom COMP to GND
MIN TYP MAX UNITS
2.35 3.60
4 4.6
5.5
1.4 2.3
2
13
2 2.1
1.8 1.9
2
V
mA
mA
µA
V
µs
5
µA
10
20 ns
2V
1.4 V/µs
1V
8
Select
-1
from
+1
Table 1
0.594 0.600 0.606
5 8 11
115
%
V
k
dB
2 _______________________________________________________________________________________


Part Number MAX8646
Description 2MHz Step-Down Regulator
Maker Maxim Integrated Products
PDF Download

MAX8646 Datasheet PDF






Similar Datasheet

1 MAX864 Dual-Output Charge Pump with Shutdown
Maxim
2 MAX8640Y 4MHz/2MHz Synchronous Step-Down DC-DC Converters
Maxim Integrated Products
3 MAX8640Z 4MHz/2MHz Synchronous Step-Down DC-DC Converters
Maxim Integrated Products
4 MAX8643 2MHz Step-Down Regulator
Maxim Integrated Products
5 MAX8643A 2MHz Step-Down Regulator
Maxim Integrated Products
6 MAX8645X (MAX8645X/Y) 1x/1.5x/2x White LED Charge Pumps
Maxim Integrated Products
7 MAX8645Y (MAX8645X/Y) 1x/1.5x/2x White LED Charge Pumps
Maxim Integrated Products
8 MAX8646 2MHz Step-Down Regulator
Maxim Integrated Products
9 MAX8647 (MAX8647 / MAX8648) Ultra-Efficient Charge Pumps
Maxim Integrated Products





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z



Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy