FN8808 datasheet(1/44 Pages) RENESAS

Teilenummer	FN8808

Bauteilbeschribung	2-Phase Boost Controller with Integrated Drivers

PDF	44 Pages

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Hersteller	RENESAS [Renesas Technology Corp]

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FN8808 Rev.6.02

Page 1 of 43

Feb 28, 2025

ISL78227

2-Phase Boost Controller with Integrated Drivers

DATASHEET

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.

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.

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.

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.

Features

• 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

• 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

• 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

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

FIGURE 1. SIMPLIFIED APPLICATION SCHEMATIC, 2-PHASE

SYNCHRONOUS BOOST

FIGURE 2. EFFICIENCY CURVES, VIN = 12V, TA = +25°C

ISL78227

BOOT1

PH1

FB

VOUT

LG1

CLKOUT

PGOOD

UG1

BOOT2

PH2

LG2

UG2

SS

VIN

EN

TRACK

EN_IC

ISEN1N

ISEN1P

ISEN2N

ISEN2P

COMP

RSEN1

RSEN2

POWER-

GOOD

CLOCK_OUT

PVCC

VIN

PVCC

PGND

PVCC

50

55

60

65

70

75

80

85

90

95

100

0

1

2

3

4

5

6

7

8

9 10 11 12 13 14 15

LOAD CURRENT (A)

VO = 18V

VO = 36V

VO = 24V

NOTE: (See Typical Application in Figure 4 on page 8.)

Ähnliche Beschreibung - FN8808

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