Datasheet

MAX8702/MAX8703
Dual-Phase MOSFET Drivers
with Temperature Sensor
_______________________________________________________________________________________ 7
Typical Operating Circuit
The typical operating circuit of the MAX8702 (Figure 2)
shows the power-stage and gate-driver circuitry of a dual-
phase CPU core supply operating at 300kHz, with each
phase capable of supplying 20A of load current. Table 1
lists recommended component options, and Table 2 lists
the component suppliers’ contact information.
Detailed Description
The MAX8702/MAX8703 dual-phase noninverting
MOSFET drivers are intended to work with PWM con-
troller ICs in CPU core and other multiphase switching
regulators. Each MOSFET driver is capable of driving
3nF capacitive 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 pre-
vents shoot-through currents and maximizes converter
NH1
MAX8702
NL1
2.2µF
0.22µF
0.22µF
1µF
10Ω
+5V
R
TSET
D
BST1
TSET
AGND
D1
L1
V
OUT
V
OUT
V
IN
7V TO 20V
V
IN
7V TO 20V
BST1
DH1
LX1
DL1
PGND1
V
CC
DRHOT
C
OUT1
C
IN1
V
DD
NH2
SHDN
+5V
NL2
D2
L2
BST2
DH2
LX2
FROM
CONTROLLER
IC
DL2
PGND2
C
OUT2
C
IN2
D
BST2
100kΩ
+5V
DRSKP
SKIP
PWM1
PWM1
PWM2
PWM2
Figure 2. MAX8702 Typical Operating Circuit
DESIGNATION DESCRIPTION
Total Input
Capacitance (C
IN
)
(4) 10µF, 25V
Taiyo Yuden TMK432BJ106KM or
TDK C4532X5R1E106M
Total Output
Capacitance (C
OUT
)
(4) 330µF, 2.5V, 9mΩ low-ESR polymer
capacitor (D case)
Sanyo 2R5TPE330M9
Schottky Diode
(per phase)
3A Schottky diode
Central Semiconductor
CMSH3-40
Inductor (per phase)
0.6µH
Panasonic ETQP1H0R6BFA or
Sumida CDEP134H-0R6
High-Side MOSFET
(NH, per phase)
Siliconix (1) Si7892DP or
International Rectifier (2) IRF6604
Low-Side MOSFET
(NL, per phase)
Siliconix (2) Si7442DP or
International Rectifier (2) IRF6603
Table 1. Component List
SUPPLIER WEBSITE
Central Semiconductor www.centralsemi.com
Fairchild Semiconductor www.fairchildsemi.com
International Rectifier www.irf.com
Panasonic www.panasonic.com
Sanyo www.secc.co.jp
Siliconix (Vishay) www.vishay.com
Sumida www.sumida.com
Taiyo Yuden www.t-yuden.com
TDK www.component.tdk.com
Table 2. Component Suppliers
DH_
BST_
LX_
DL_
V
DD
PGND_
V
CC
TSET*
DRHOT*
PWM_
ZX
SKIP
AGND
SHDN
CONTROL
AND ADAPTIVE
DEAD-TIME
CIRCUIT
TEMP
SENSOR +
TSDN
LX_
PGND_
PWM BLOCK (x2)
*MAX8702 ONLY
MAX8702
MAX8703
UVLO
Figure 3. MAX8702 Functional Diagram