PWM Doubler/Quad Logic
IR3599/IR3599A
FEATURES
3.3V supply voltage
Configurable phase multiplier as either
doubler or quad from a single PWM input
Capable of generating high output
switching frequencies from 200k-800kHz
Tri-state PWM input and outputs for
power stage shutdown
IR3599A is configured to accept IR’s
patented Active Tri-Level (ATL) PWM
signals while IR3599 accepts industry’s
standard tri-state PWM signals
VCC Power-on-reset
Dual Flat No-Lead (DFN) Package
Lead free RoHS compliant package
DESCRIPTION
IR3599/IR3599A is a phase multiplier which is designed to
double or quadruple the effective maximum phase count
from the controller, enabling a well-controlled, high phase
count voltage regulator.
Each IR3599/IR3599A is able to drive up to four independent
power stages from one PWM input. The IR3599/IR3599A
can be configured as DOUBLER logic where one PWM
signal is internally split to drive the two power stages 180°
out of phase, each at half of the PWM input frequency.
The IR3599/IR3599A can also be configured as QUAD logic
where one PWM signal is internally split at 0º, 90º, 180º,
and 270º respectively, and each at 1/4 of the PWM input
frequency.
IR3599A features the patented IR Active Tri-Level (ATL)
PWM input and output, designed to work with IR digital
multi-phase controller and IR PowIRstage. The unique
doubler/quad mode ATL tri-state timing allows the VR to
transition into tri-state faster during load releases. IR3599
features industry’s standard tri-state PWM input and output
interfaces, designed to work with general multi-phase
controllers, drivers or power stages.
IR3599/IR3599A also incorporates a power-on reset feature,
which ensures the device is active only after the supply
voltage exceeds a certain minimum operating threshold.
APPLICATIONS
Servers and Desktop Computers
High Phase Count and Phase Shedding
Applications
High Frequency and High Efficiency VRM
ORDERING INFORMATION
Base Part
Number
IR3599
IR3599A
IR3599
IR3599A
Package Type
Form
DFN 2 mm x 2 mm
DFN 2 mm x 2 mm
DFN 2 mm x 2 mm
DFN 2 mm x 2 mm
Tape and Reel
Tape and Reel
Tape and Reel
Tape and Reel
Standard Pack
Quantity
3000
3000
100
100
Orderable
Part Number
IR3599MTRPBF
IR3599AMTRPBF
IR3599MTRPBF
IR3599AMTRPBF
1
www.irf.com
| © 2012 International Rectifier
July 02, 2012 | V1.8
PWM Doubler/Quad Logic
IR3599/IR3599A
PIN DESCRIPTIONS
PIN #
PIN NAME
PIN DESCRIPTION
The PWM_IN is the control signal input. Connect this pin to the PWM output of the controller. In
Doubler mode, PWM_IN controls the behavior of PWM1 and PWM2. In QUAD mode, PWM_IN
controls the behavior of PWM1, PWM2, PWM3, and PWM4.
1.8V internal LDO output. Place a high quality low ESR 0.47uF ceramic capacitor from this pin to the
IR3599/IR3599A GND.
Connect this pin to a +3.3V bias supply. Place a high quality low ESR 0.1uF ceramic capacitor from
this pin to the IR3599/IR3599A GND.
The FUNCTION pin controls the Phase Mode (Doubler or Quad Modes). The FUNCTION pin levels
are controlled by connecting the FUNCTION pin to Ground or VCC. Refer to the configuration
instructions in Table 1 to program the FUNCTION pin. At power up, the function pin selection
is latched into the IR3599/IR3599A, and therefore cannot be changed after initial power up.
Channel 4 PWM signal to the power stage
Channel 3 PWM signal to the power stage
Channel 2 PWM signal to the power stage
Channel 1 PWM signal to the power stage
Bias and reference ground. All signals are referenced to this node.
1
PWM_IN
2
3
V1p8
VCC
4
FUNCTION
5
6
7
8
(PAD) 9
PWM4
PWM3
PWM2
PWM1
GND
5
www.irf.com
| © 2012 International Rectifier
July 02, 2012 | V1.8