Dual/Doubler Interleaved MOSFET Driver
October 27, 2011 | FINAL | V1.09
FEATURES
Dual MOSFET drivers in single 16 pin QFN
package
Multimode operation to configure the driver
as either dual or doubler/interleaved mode
drivers
Variable Gate drive from 4V to 13V to
optimize system efficiency
5V VCC and VDRV capability for sleep states
where only 5V is available
Large drivers designed to drive 3nF in < 12ns
with any voltage from 5V to 12V (typ)
supplied to the VDRV pin
Low side driver – 0.85Ω source/0.38Ω sink
High side driver – 1.1Ω source/0.60Ω sink
Propagation delays < 20ns
Integrated bootstrap diode on both drivers
Capable of high output switching frequencies
from 150kHz up to greater than 1MHz
Compatible with IR’s patented Active
Tri-Level (ATL) PWM for fastest response to
transient overshoot as well as industry
standard 3.3V and 5V Tri-State signals in
most modes
Non-overlap and under voltage protection
Thermally enhanced 16 pin QFN package
Lead free RoHS compliant package
Low Quiescent power to optimize efficiency
BASIC APPLICATION
VDRV
LG1
HG1
VCC
GND
PWM1
12V
BOOT2
SW1
V
MODE
12V
FUNCTION
LG2
HG2
SW2
BOOT1
C
Boot1
R
Boot1
C
Boot2
R
Boot2
IR3598
5V
C
VCC
R
VCC
V_VGD
C
DRV
PWM From Controller
Refer to Table 1
Refer to Table 1
PWM2
NC
EN
NC
Figure 1: IR3598 Typical DOUBLER Mode
Application Circuit
DESCRIPTION
The IR3598 is a high-efficiency dual driver capable of switching
a pair of high and low side N-channel MOSFETs in synchronous
buck converters and is optimized for use with IR’s Digital PWM
controllers to provide a total voltage regulator solution for today’s
advanced computing applications. In a space saving 16-pin QFN
package, the IR3598 can significantly improve density in high
phase count voltage regulators saving over 50% board space
versus conventional drivers.
The IR3598 can be configured as two independent drivers in DUAL
mode with individual PWM signals, or as an interleaved DOUBLER
driver where one PWM signal is internally split to drive the two
pairs of MOSFETs 180° out of phase. The inter-leaving action is
optimized internally to manage the tri-state action of multiple
phases during transients, low current single phase operation, and
PS2 operation (see Figs. 8 and 9.) The DOUBLER mode can double
the effective maximum phase count from the controller, enabling
a well-controlled, high phase count voltage regulator.
The IR3598 has a proprietary circuit which maintains the MOSFET
drive strength throughout the 4.0V to 13.2V drive voltage range
thus insuring fast switching even with 5V standby drive operation
during system sleep modes. The integrated boot diodes reduce
external component count. The IR3598 also features an adaptive
non-overlap control for shoot-through protection.
The IR3598 PWM inputs are compatible with IR’s fast Active
Tri-Level (ATL) PWM signals as well as 3.3V and 5V Tri-State
PWM signals.
APPLICATIONS
Desktop CPU and GPU solutions
Performance overclocking CPU and GPU VR solutions
Optimized for Sleep state S3 systems using +5VSB
PIN DIAGRAM
Top View
GND
Pad = Pin 17
3x3mm QFN
VCC
SW2
NC
EN
FUNCTION
BOOT1
MODE
VDRV
BOOT2
4
3
2
1
5
6
7
8
16
15
14
13
9
10
11
12
HG2
LG2
PWM2
PWM1
SW1
HG1
LG1
Figure 2: IR3598 Package Top View
