MAX8811_07 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – High-Speed, Dual-Phase Driver with Integrated Boost Diodes

19-3974; Rev 1; 4/07
EVAALVUAAILTAIOBNLEKIT
High-Speed, Dual-Phase Driver
with Integrated Boost Diodes
General Description
The MAX8811 2-phase gate driver controls power
MOSFETs in multiphase synchronous step-down con-
verter applications, providing up to 30A output current
per phase. The MAX8811 and MAX8810A (multiphase
power-supply controller) combine to provide an efficient,
low-cost solution for a wide range of multiphase power-
supply applications. The MAX8811 handles system input
voltages up to 26V. Each MOSFET driver is capable of
driving 3000pF capacitive loads with 11ns typical rise
and fall times.
Adaptive shoot-through protection circuitry is imple-
mented to prevent shoot-through currents for the “high-
side off to low-side on” transition. A programmable
delay is provided for the “low-side off to high-side on”
transition. This maximizes overall converter efficiency
while supporting operation with a variety of MOSFETs.
The MAX8811 provides an easy upgrade path from the
MAX8523 dual driver. Integrated bootstrap diodes
reduce external component count, while an enable
input provides flexibility for power sequencing. The
MAX8811 is available in a space-saving, 16-pin QSOP.
Applications
Processor Core Voltage Regulators
Multiphase Buck Converters
Voltage-Regulator Modules (VRMs)
Switching Power Supplies
DC-DC Converter Modules
Pin Configuration
TOP VIEW
BST1 ₁ ⁺
DH1 2
LX1 3
VL1 4 MAX8811
DL1 5
PGND1 6
EN 7
DLY 8
QSOP
16 BST2
15 DH2
14 LX2
13 VL2
12 DL2
11 PGND2
10 PWM2
9 PWM1
Features
♦ Dual-Phase Synchronous Buck Driver
♦ Integrated Bootstrap Diodes
♦ Up to 26V System Input Voltage
♦ 6A Peak Gate Drive Current
♦ Capable of 30A per Phase
♦ 0.4Ω/0.9Ω Low-Side, 0.7Ω/1.0Ω High-Side
Drivers (typ)
♦ Typical 11ns Rise/Fall Times with 3000pF Load
♦ Adaptive Dead-Time Control
♦ User-Programmable Delay Time
♦ Enable Function with 0.04µA (typ) Quiescent
Current in Shutdown
♦ Space-Saving, Lead-Free, 16-Pin QSOP
Ordering Information
PART
TEMP RANGE
MAX8811EEE+ -40°C to +85°C
+Denotes a lead-free package.
PIN-
PACKAGE
16 QSOP
PKG
CODE
E16-4
Typical Operating Circuit
GATE-DRIVE SUPPLY
4.5V TO 7V
4 _VL1
13 _VL2
8 _DLY
DH1 ²
BST1 ¹
3
LX1
DL1 ⁵
6
PGND1
POWER INPUT
UP TO 26V
OUTPUT
+
ON
OFF
PWM CONTROL
SIGNALS
MAX8811
7
EN
9 _PWM1
10 _PWM2
DH2 ¹⁵
BST2 ¹⁶
LX2 ¹⁴
DL2 ¹²
11
PGND2
________________________________________________________________ Maxim Integrated Products 1
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