DATASHEET
ISL78227
2-Phase Boost Controller with Integrated Drivers
FN8808
Rev.6.00
Oct 22, 2021
The ISL78227 is an automotive grade (AEC-Q100 Grade 1),
2-phase, 55V synchronous boost controller that simplifies the
design of high power boost applications. It integrates strong
half-bridge drivers, an analog/digital tracking input, and
comprehensive protection functions.
Features
• Input/output voltage range: 5V to 55V, withstands 60V
transients
• Supports synchronous or standard boost topology
The ISL78227 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. The ISL78227 offers a 90° output clock and supports
1-, 2-, and 4-phases.
• Peak current mode control with adjustable slope
compensation
• Secondary average current control loop
• 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
The ISL78227 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 pre-bias 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. In the event of a fault, the
fault protection response can be selected to be latch-off or
hiccup recovery.
• Forced PWM operation with negative current limiting and
protection
• Comprehensive fault protections
• Selectable hiccup or latch-off fault response
• AEC-Q100 qualified, Grade 1: -40°C to +125°C
• 5mmx5mm 32 Ld Wettable Flank QFN (WFQFN) package
Also integrated are several functions that ease system design.
A unique tracking input controls the output voltage, allowing it
to track either a digital duty cycle (PWM) signal or an analog
reference. The ISL78227 provides input average current
limiting so the system can deliver transient bursts of high load
current while limiting the average current to avoid overheating.
Applications
• Automotive power systems (12V to 24V, 12V to 48V, etc.)
- Trunk audio amplifiers
- Start-stop systems
- Automotive boost applications
• Industrial and telecommunication power supplies
ISL78227
PVCC
VOUT
PVCC
PVCC
PGND
BOOT1
100
95
UG1
PH1
RSEN1
VIN
90
VO = 18V
LG1
VIN
VIN
EN
85
ISEN1N
ISEN1P
80
EN_IC
VO = 24V
75
VO = 36V
POWER-
GOOD
PGOOD
70
65
60
55
50
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
FN8808 Rev.6.00
Oct 22, 2021
Page 1 of 43
© 2015 Renesas Electronics
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