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MAX8702ETP+T

P1-P3P4-P6P7-P9P10-P12P13-P14
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.
Applications
Multiphase High-Current Power Supplies
2- to 4-Cell Li+ Battery to CPU Core Supplies
Notebook and Desktop Computers
Servers and Workstations
Features
♦ Dual-Phase MOSFET Driver
♦ 0.35Ω (typ) On-Resistance and 5A (typ)
Drive Current
♦ Drives Large Synchronous-Rectifier MOSFETs
♦ Integrated Temperature Sensor (MAX8702 Only)
Resistor Programmable
Open-Drain Driver Hot Indicator (DRHOT)
♦ Adaptive Dead Time Prevents Shoot-Through
♦ Selectable Pulse-Skipping Mode
♦ 4.5V to 28V Input Voltage Range
♦ Thermally Enhanced Low-Profile Thin QFN Package
MAX8702/MAX8703
Dual-Phase MOSFET Drivers
with Temperature Sensor
________________________________________________________________ Maxim Integrated Products 1
MAX8702
+5V
TSET
AGND
V
OUT
V
IN
4.5V TO 28V
BST1
DH1
LX1
DL1
PGND1
V
CC
DRHOT
V
DD
SHDN
+5V
V
OUT
V
IN
4.5V TO 28V
+5V
BST2
DH2
LX2
DL2
PGND2
SKIP
PWM1
PWM2
Minimal Operating Circuit
Ordering Information
19-3357; Rev 0; 8/04
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.
PART
TEMP RANGE
PIN-
PACKAGE
D ESC R IPT IO N
MAX8702ETP
-40°C to +100°C
20 Thi n Q FN
4m m x 4m m
Dual-Phase
Driver with
Temp. Sensor
MAX8703ETP
-40°C to +100°C
20 Thi n Q FN
4m m x 4m m
Dual-Phase
Driver without
Temp. Sensor
Pin Configuration appears at end of data sheet.
MAX8702/MAX8703
Dual-Phase MOSFET Drivers
with Temperature Sensor
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2. V
CC
= V
DD
= V
SHDN
= V
SKIP
= 5V, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)
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.
V
CC
to AGND............................................................-0.3V to +6V
V
DD
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 (V
DD
+ 0.3V)
LX_ to AGND .............................................................-2V to +30V
DH_ to LX_...............................................-0.3V to (V
BST_
+ 0.3V)
BST_ to LX_ ..............................................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +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
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Voltage Range V
CC
4.5 5.5 V
V
CC
rising 3.4
3.85
4.1
V
CC
Undervoltage-Lockout
Threshold
V
UVLO
85mV typical
hysteresis
V
CC
falling 3.3
3.75
4.0
V
SKIP = AGND, PWM_ = AGND 200 400 µA
V
CC
Quiescent Current
(Note 1)
I
CC
SKIP = AGND, PWM_ = V
CC
23mA
V
DD
Quiescent Current I
DD
SKIP = AGND, PWM_ = AGND 1 5 µA
V
CC
Shutdown Current SHDN = SKIP = AGND 2 5 µA
V
DD
Shutdown Current SHDN = SKIP = AGND 1 5 µA
GATE DRIVERS AND DEAD-TIME CONTROL (Figure 1)
t
PWM-DL
PWM_ high to DL_ low 19
DL_ Propagation Delay
t
DH-DL
DH_ low to DL_ high 36
ns
t
DL-DH
DL_ low to DH_ high 25
DH_ Propagation Delay
t
PWM-DH
PWM_ low to DH_ low 23
ns
t
F
_
DL
DL_ falling, 3nF load 11
DL_ Transition Time
t
R
_
DL
DL_ rising, 3nF load 8
ns
t
F
_
DH
DH_ falling, 3nF load 14
DH_ Transition Time
t
R
_
DH
DH_ rising, 3nF load 16
ns
DH_ On-Resistance (Note 2) R
DH
V
BST
_ - V
LX
_ = 5V 1.0 4.5 Ω
R
DL
_
HIGH
High state (pullup) 1.0 4.5
DL_ On-Resistance (Note 2)
R
DL
_
LOW
Low state (pulldown)
0.35
2.0
Ω
DH_ Source/Sink Current I
DH
V
DH
_ = 2.5V, V
BST
_ - V
LX
_ = 5V 1.5 A
DL_ Source Current
I
DL
_
SOURCE
V
DL
_ = 2.5V 1.5 A
DL_ Sink Current I
DL
_
SINK
V
DL
_ = 5V 5 A
Zero-Crossing Threshold V
PGND
_ - V
LX
_, SKIP = AGND 2.5 mV
TEMPERATURE SENSOR
Temperature Threshold
Accuracy
T
A
= +85°C to +125°C, 10°C falling hysteresis
-5 +5 °C
DRHOT Output Low Voltage I
SINK
= 3mA 0.4 V
DRHOT Leakage Current High state, V
DRHOT
= 5.5V 1 µA
MAX8702/MAX8703
Dual-Phase MOSFET Drivers
with Temperature Sensor
_______________________________________________________________________________________ 3
Note 1: Static drivers instead of pulsed-level translators.
Note 2: Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the
thin QFN package.
Note 3: Specifications from -40°C to +100°C are guaranteed by design, not production tested.
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Thermal-Shutdown Threshold
10°C hysteresis
+160
°C
LOGIC CONTROL SIGNALS
Logic Input High Voltage SHDN, SKIP, PWM1, PWM2 2.4 V
Logic Input Low Voltage SHDN, SKIP, PWM1, PWM2 0.8 V
Logic Input Current SHDN, SKIP, PWM1, PWM2 -1 +1 µA
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2. V
CC
= V
DD
= V
SHDN
= V
SKIP
= 5V, T
A
= 0°C to +85°C. Typical values are at T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Voltage Range V
CC
4.5 5.5 V
V
CC
rising 3.4 4.1
V
CC
Undervoltage-Lockout
Threshold
V
UVLO
85mV typical
hysteresis
V
CC
falling 3.3 4.0
V
SKIP = AGND, PWM_ = PGND_ 450 µA
V
CC
Quiescent Current I
CC
SKIP = AGND, PWM_ = V
CC
3mA
V
DD
Quiescent Current I
DD
SKIP = AGND, PWM_ = PGND_,
T
A
= -40°C to +85°C
5µA
V
CC
Shutdown Current
SHDN = SKIP = AGND, T
A
= -40°C to +85°C
5µA
V
DD
Shutdown Current
SHDN = SKIP = AGND, T
A
= -40°C to +85°C
5µA
GATE DRIVERS AND DEAD-TIME CONTROL
DH_ On-Resistance (Note 2) R
DH
V
BST
_ - V
LX
_ = 5V 1.0 4.5 Ω
R
DL
_
HIGH
High state (pullup) 1.0 4.5
DL_ On-Resistance (Note 2)
R
DL
_
LOW
Low state (pulldown)
0.35
2.0
Ω
TEMPERATURE SENSOR
DRHOT Output Low Voltage I
SINK
= 3mA 0.4 V
LOGIC CONTROL SIGNALS
Logic Input High Voltage SHDN, SKIP, PWM1, PWM2 2.4 V
Logic Input Low Voltage SHDN, SKIP, PWM1, PWM2 0.8 V
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 2. V
CC
= V
DD
= V
SHDN
= V
SKIP
= 5V, T
A
= -40°C to +100°C, unless otherwise noted.) (Note 3)
P1-P3P4-P6P7-P9P10-P12P13-P14

MAX8702ETP+T

Mfr. #:
Buy MAX8702ETP+T
Manufacturer:
Maxim Integrated
Description:
Gate Drivers Dual-Phase MOSFET Driver w/Temp Sensor
Lifecycle:
New from this manufacturer.
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