DATASHEET
2
2-Phase Boost Controller with Drivers and I C/PMBus™
ISL78229
Features
The ISL78229 is an automotive grade (AEC-Q100 Grade 1),
2-phase 55V synchronous boost controller intended to simplify
the design of high power boost applications. It integrates
strong half-bridge drivers, an analog/digital tracking input,
comprehensive protection functions and a PMBus™ interface
for added control and telemetry.
• Input/output voltage range: 5V to 55V, withstands 60V
transients
• Supports synchronous or standard boost topology
• Peak current mode control with adjustable slope
compensation
• Secondary average current control loop
ISL78229 enables a simple, modular design for systems
requiring power and thermal scalability. It offers peak-current
mode control for fast line response and simple compensation.
Its synchronous 2-phase architecture enables it to support
higher current while reducing the size of input and output
capacitors. The integrated drivers feature programmable
adaptive dead time control offering flexibility in power stage
design. ISL78229 offers a 90°output clock and supports 1-,
2- and 4-phases.
• Integrated 5V 2A sourcing/3A sinking N-channel MOSFET
drivers
• Switching frequency: 50kHz to 1.1MHz per phase
• External synchronization
• Programmable minimum duty cycle
• Programmable adaptive dead time control
• Optional diode emulation and phase dropping
• PWM and analog track function
ISL78229 offers a highly robust solution for the most
demanding environments. Its unique soft-start control
prevents large negative current even in extreme cases, such as
a restart under high output prebias on high volume
capacitances. It also offers two levels of cycle-by-cycle
overcurrent protection, average current limiting, input OVP,
output UVP/OVP and internal OTP. A thermistor input is
provided for external OTP for the power-stage elements. In the
event of a fault, the ISL78229 offers individually
• Forced PWM operation with negative current limiting and
protection
• Comprehensive protection/fault reporting
• Selectable hiccup or latch-off fault response
2
• I C/PMBus™ compatible digital interface
• AEC-Q100 qualified, Grade 1: -40°C to +125°C
programmable latch-off or hiccup recovery for each fault type.
• 6mmx6mm 40 Ld WFQFN (Wettable Flank QFN) package
Also integrated are several functions that ease system design.
A unique tracking input is available that can control the output
voltage, allowing it to track either a digital duty cycle (PWM)
signal or an analog reference. ISL78229 provides input
average current limiting so the system can deliver transient
bursts of high load current while limiting the average current to
avoid overheating. Finally, the ISL78229 PMBus™ interface
provides fault reporting, telemetry and system control to
support functional safety qualification.
Applications
• Automotive power system (e.g., 12V to 24V, 12V to 48V, etc.)
- Trunk audio amplifier
- Start-stop system
- Automotive boost applications
• Industrial and telecommunication power supplies
PVCC
VIN
VIN
EN
100
95
VOUT
BOOT1
EN_IC
UG1
PH1
RSEN1
90
NTC
VO = 18V
VIN
85
LG1
80
SDA
SCL
SALERT
VO = 24V
PMBus
ISEN1N
ISEN1P
75
VO = 36V
ISL78229
70
65
60
55
50
POWER-GOOD
PGOOD
BOOT2
UG2
PH2
TRACK
CLKOUT
SS
RSEN2
CLOCK_OUT
LG2
ISEN2N
ISEN2P
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
COMP
LOAD CURRENT (A)
FB
NOTE: (See Typical Application in Figure 4 on page 8.)
FIGURE 2. EFFICIENCY CURVES, V = 12V, T = +25°C
FIGURE 1. SIMPLIFIED APPLICATION SCHEMATIC, 2-PHASE
SYNCHRONOUS BOOST
IN
A
February 12, 2016
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas LLC 2015, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1
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