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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX8703 Datasheet

Dual-Phase MOSFET Drivers

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19-3357; Rev 0; 8/04
Dual-Phase MOSFET Driverswww.DataSheet4U.com
with Temperature Sensor
General Description
The MAX8702/MAX8703 dual-phase noninverting
MOSFET drivers are designed to work with PWM con-
troller ICs, such as the MAX8705/MAX8707, in note-
book CPU core and other multiphase regulators.
Applications can either step down directly from the bat-
tery voltage to create the core voltage, or step down
from a low-voltage system supply. The single-stage con-
version method allows the highest possible efficiency,
while the 2-stage conversion at higher switching frequen-
cy provides the minimum possible physical size.
Each MOSFET driver is capable of driving 3nF capaci-
tive loads with only 19ns propagation delay and 8ns
typical rise and fall times. Larger capacitive loads are
allowable but result in longer propagation and transition
times. Adaptive dead-time control helps prevent shoot-
through currents and maximizes converter efficiency.
The MAX8702/MAX8703 feature zero-crossing com-
parators on each channel. When enabled, these com-
parators permit the drivers to be used in pulse-skipping
operation, thereby saving power at light loads. A sepa-
rate shutdown control is also included that disables all
functions, drops quiescent current to 2µA, and sets DH
low and DL high.
The MAX8702 integrates a resistor-programmable tem-
perature sensor. An open-drain output (DRHOT) signals
to the system when the local die temperature exceeds
the set temperature. The MAX8702/MAX8703 are avail-
able in a thermally-enhanced 20-pin thin QFN package.
Features
o Dual-Phase MOSFET Driver
o 0.35(typ) On-Resistance and 5A (typ)
Drive Current
o Drives Large Synchronous-Rectifier MOSFETs
o Integrated Temperature Sensor (MAX8702 Only)
Resistor Programmable
Open-Drain Driver Hot Indicator (DRHOT)
o Adaptive Dead Time Prevents Shoot-Through
o Selectable Pulse-Skipping Mode
o 4.5V to 28V Input Voltage Range
o Thermally Enhanced Low-Profile Thin QFN Package
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
DESCRIPTION
MAX8702ETP
-40°C to +100°C
20 Thin QFN
4mm x 4mm
Dual-Phase
Driver with
Temp. Sensor
Dual-Phase
MAX8703ETP
-40°C to +100°C
20 Thin QFN
4mm x 4mm
Driver without
Temp. Sensor
Minimal Operating Circuit
Applications
Multiphase High-Current Power Supplies
2- to 4-Cell Li+ Battery to CPU Core Supplies
Notebook and Desktop Computers
Servers and Workstations
+5V
Pin Configuration appears at end of data sheet.
VDD
VCC
AGND
TSET
BST1
DH1
LX1
DL1
PGND1
MAX8702
BST2
DRHOT
SHDN
SKIP
PWM1
PWM2
DH2
LX2
DL2
PGND2
+5V
+5V
VIN
4.5V TO 28V
VOUT
VIN
4.5V TO 28V
VOUT
________________________________________________________________ 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

MAX8703 Datasheet

Dual-Phase MOSFET Drivers

No Preview Available !

Dual-Phase MOSFET Drivers
with Temperature Sensor
www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
VCC to AGND............................................................-0.3V to +6V
VDD to AGND............................................................-0.3V to +6V
PGND_ to AGND ...................................................-0.3V to +0.3V
SKIP, SHDN, DRHOT, TSET to AGND......................-0.3V to +6V
PWM_ to AGND ........................................................-0.3V to +6V
DL_ to PGND_ ............................................-0.3V to (VDD + 0.3V)
LX_ to AGND .............................................................-2V to +30V
DH_ to LX_ ...............................................-0.3V to (VBST_ + 0.3V)
BST_ to LX_ ..............................................................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
20-Pin 4mm x 4mm Thin QFN
(derate 16.9mW/°C above +70°C) .............................1349mW
Operating Temperature Range .........................-40°C to +100°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
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 2. VCC = VDD = VSHDN = VSKIP = 5V, TA = 0°C to +85°C. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
Input Voltage Range
VCC
VCC Undervoltage-Lockout
Threshold
VCC Quiescent Current
(Note 1)
VDD Quiescent Current
VCC Shutdown Current
VDD Shutdown Current
VUVLO
ICC
IDD
85mV typical VCC rising
hysteresis
VCC falling
SKIP = AGND, PWM_ = AGND
SKIP = AGND, PWM_ = VCC
SKIP = AGND, PWM_ = AGND
SHDN = SKIP = AGND
SHDN = SKIP = AGND
GATE DRIVERS AND DEAD-TIME CONTROL (Figure 1)
DL_ Propagation Delay
tPWM-DL
tDH-DL
PWM_ high to DL_ low
DH_ low to DL_ high
DH_ Propagation Delay
tDL-DH
tPWM-DH
DL_ low to DH_ high
PWM_ low to DH_ low
DL_ Transition Time
tF_DL
tR_DL
DL_ falling, 3nF load
DL_ rising, 3nF load
DH_ Transition Time
tF_DH
tR_DH
DH_ falling, 3nF load
DH_ rising, 3nF load
DH_ On-Resistance (Note 2)
RDH
VBST_ - VLX_ = 5V
DL_ On-Resistance (Note 2)
RDL_HIGH High state (pullup)
RDL_LOW Low state (pulldown)
DH_ Source/Sink Current
IDH VDH_ = 2.5V, VBST_ - VLX_ = 5V
DL_ Source Current
IDL_SOURCE VDL_ = 2.5V
DL_ Sink Current
Zero-Crossing Threshold
IDL_SINK
VDL_ = 5V
VPGND_ - VLX_, SKIP = AGND
TEMPERATURE SENSOR
Temperature Threshold
Accuracy
DRHOT Output Low Voltage
DRHOT Leakage Current
TA = +85°C to +125°C, 10°C falling hysteresis
ISINK = 3mA
High state, VDRHOT = 5.5V
MIN
4.5
3.4
3.3
-5
TYP
3.85
3.75
200
2
1
2
1
MAX
5.5
4.1
4.0
400
3
5
5
5
UNITS
V
V
µA
mA
µA
µA
µA
19
36
25
23
11
8
14
16
1.0
1.0
0.35
1.5
1.5
5
2.5
4.5
4.5
2.0
ns
ns
ns
ns
A
A
A
mV
+5 °C
0.4 V
1 µA
2 _______________________________________________________________________________________


Part Number MAX8703
Description Dual-Phase MOSFET Drivers
Maker Maxim Integrated Products
Total Page 14 Pages
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