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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8756 Datasheet

Dual Power-Supply Controller

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19-3569; Rev 2; 4/07
EVAALVUAAILTAIOBNLEKIT
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
General Description
The MAX8716/MAX8717/MAX8756/MAX8757 are dual,
step-down, interleaved, fixed-frequency, switch-mode
power-supply (SMPS) controllers with synchronous rec-
tification. The MAX8716/MAX8717/MAX8756/MAX8757
are intended for main (5V/3.3V) power generation, while
the MAX8756 is optimized for I/O power rails in battery-
powered systems.
Fixed-frequency operation with optimal interleaving min-
imizes input ripple current from the lowest input voltages
up to the 26V maximum input. Optimal 40/60 interleav-
ing allows the input voltage to go down to 8.3V before
duty-cycle overlap occurs in 5V/3.3V applications, com-
pared to 180° out-of-phase regulators where the duty-
cycle overlap occurs when the input drops below 10V.
Accurate output current limit is achieved using a sense
resistor. Alternatively, power dissipation can be
reduced using lossless inductor current sensing.
Independent ON/OFF controls and power-good signals
allow flexible power sequencing. Soft-start reduces
inrush current, while soft-stop gradually ramps the out-
put voltage down preventing negative voltage dips.
A low-noise mode maintains high light-load efficiency
while keeping the switching frequency out of the audi-
ble range.
The MAX8716 is available in a 24-pin thin QFN pack-
age, and the MAX8717/MAX8756/MAX8757 are avail-
able in a 28-pin thin QFN package.
Applications
2 to 4 Li+ Cell Battery-Powered Devices
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Main or I/O Power Supplies
Dual Mode is a trademark of Maxim Integrated Products, Inc.
Features
o Fixed Switching Frequency
200kHz, 300kHz, or 500kHz
250kHz, 300kHz, or 400kHz (MAX8756 Only)
o No Current-Sense Resistor Required
o 40/60 Optimal Interleaving
o Reduced Input-Capacitor Requirement
o Output Voltage Fixed or Adjustable Outputs
(Dual Mode™)
3.3V/5V Fixed or 1V to 5.5V Adjustable
1.5V/1.8V Fixed or 1V to 2.3V Adjustable
(MAX8756 Only)
o 4V to 26V Input Range
o Independently Selectable PWM, Skip, and Low-
Noise Mode Operation
o Soft-Start and Soft-Stop
o 2V Precision Reference with 0.75% Accuracy
o Independent Power-Good Outputs
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
PKG
CODE
MAX8716ETG
-40°C to +85°C
24 Thin QFN
4mm x 4mm
T2444-4
MAX8716ETG+
-40°C to +85°C
24 Thin QFN
4mm x 4mm
T2444-4
MAX8717ETI
-40°C to +85°C 28 Thin QFN
5mm x 5mm
T2855-6
+Denotes a lead-free package.
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
18 17 16 15 14 13
DH1 19
BST1 20
CSH1 21
CSL1 22
FB1 23
PGOOD1 24
+
MAX8716ETG
123 4 56
12 DH2
11 BST2
10 CSH2
9 CSL2
8 FB2
7 PGOOD2
TQFN
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
TOP VIEW
21 20 19 18 17 16 15
DH1 22
14 DH2
BST1 23
13 BST2
CSH1 24
12 CSH2
CSL1 25
FB1 26
PGOOD1 27
MAX8717ETI
MAX8756ETI+
MAX8757ETI+
11 CSL2
10 FB2
9 PGOOD2
ILIM1 28
+
123456 7
8 ILIM2
TQFN
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8756 Datasheet

Dual Power-Supply Controller

No Preview Available !

Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
ABSOLUTE MAXIMUM RATINGS (Note 1)
VDD, VCC, CSL1, CSH1, CSL2, CSH2 to AGND ......-0.3V to +6V
ON1, ON2, SKIP1, SKIP2, PGOOD1,
PGOOD2 to AGND ...............................................-0.3V to +6V
FB1, FB2, ILIM1, ILIM2, FSEL to AGND ...................-0.3V to +6V
REF to AGND..............................................-0.3V to (VCC + 0.3V)
BST1, BST2 to AGND .............................................-0.3V to +36V
LX1 to BST1..............................................................-6V to +0.3V
LX2 to BST2..............................................................-6V to +0.3V
DH1 to LX1 ..............................................-0.3V to (VBST1 + 0.3V)
DH2 to LX2 ..............................................-0.3V to (VBST2 + 0.3V)
DL1, DL2 to PGND .....................................-0.3V to (VDD + 0.3V)
AGND to PGND .....................................................-0.3V to +0.3V
REF Short Circuit to AGND.........................................Continuous
REF Current ......................................................................+10mA
Continuous Power Dissipation (TA = +70°C)
24-Pin Thin QFN 4mm x 4mm (derate 20.8mW/°C
above +70°C)..........................................................1666.7mW
28-Pin Thin QFN 5mm x 5mm (derate 21.3mW/°C
above +70°C)..........................................................1702.1mW
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: For the 24-pin TQFN version, AGND and PGND refer to a single pin designated GND.
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
(Circuit of Figure 1, VIN = 12V, FSEL = REF, SKIP_ = 0, VON_ = VILIM_ = VCC = VDD = 5V, TA = 0°C to +85°C, unless otherwise noted.
Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
INPUT SUPPLIES
Input Voltage Range
VIN
VBIAS
VCC, VDD
26
V
4.5
5.5
VCC Undervoltage-Lockout
Threshold
VUVLO
200mV typical
hysteresis
VCC rising
VCC falling
3.9 4.15 4.4
V
3.7 3.95 4.2
Quiescent Supply Current (VCC)
CSL_ and FB_ forced MAX8716, MAX8717,
ICC above their regulation MAX8757
points
MAX8756
0.8
1.3
mA
1
1.8
Quiescent Supply Current (VDD)
IDD
CSL_ and FB_ forced above their regulation
points
<1
5
µA
Shutdown Supply Current (VCC)
ON1 = ON2 = GND
<1
5
µA
Shutdown Supply Current (VDD)
ON1 = ON2 = GND
<1
5
µA
MAIN SMPS CONTROLLERS
PWM1 Output Voltage in
Fixed Mode
VOUT1
VIN = 6V to 26V,
SKIP1 = VCC,
zero to full load
MAX8716, MAX8717, 3.265 3.30 3.365
MAX8757
V
MAX8756
1.484 1.50 1.530
PWM2 Output Voltage in
Fixed Mode
VOUT2
VIN = 6V to 26V,
SKIP2 = VCC,
zero to full load
MAX8716, MAX8717,
MAX8757
4.94
5.00
5.09
V
MAX8756
1.778 1.800 1.832
Feedback Voltage in Adjustable
Mode (Note 2)
VFB_
VIN = 6V to 26V, FB1 or FB2,
duty factor = 20% to 80%
VIN = 6V to 26V, FB1 or FB2,
duty factor = 50%
0.990 1.005 1.020
V
0.995 1.005 1.015
Output-Voltage-Adjust Range
Either SMPS
MAX8716, MAX8717,
MAX8757
1.0
MAX8756
1.0
5.5
V
2.3
2 _______________________________________________________________________________________



Part Number MAX8756
Description Dual Power-Supply Controller
Maker Maxim Integrated
Total Page 3 Pages
PDF Download

MAX8756 Datasheet PDF





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