UCCx8C5x BiCMOS Low-Power Current-Mode PWM Controller

1 Features

• 28-V VDD recommended max operating ratings

• New undervoltage lockout options to support both

Si and SiC MOSFET applications

• Operating frequency: 1 MHz

• 50-μA Standby Current, 75-μA Maximum

• Fast, cycle-by-cycle overcurrent limiting: 35-ns

• Peak driving current: ±1-A. Rail-to-rail output:

– 25-ns rise time

– 20-ns fall time

• Initial trimmed 2.5-V error amplifier reference: ±1%

• Pin-to-pin compatible to UCCx8C4x and drop-in

substitution

2 Applications

• General purpose single-ended DC-DC or off-line

isolated power converters

• Aux power supply in polyphase motor drives and

energy storage systems

• Flyback power supplies in solar power inverters

3 Description

The UCCx8C5x family are high-performance, current-

mode PWM controllers with low startup current.

The UCCx8C5x is an enhanced BiCMOS version

with pin-for-pin compatibility to the industry standard

UCCx8C4x family. With the VDD absolute maximum

rating extended from 20 V to 30 V for optimal

gate voltage design on 20-Vgs, 18-Vgs or 15-Vgs

SiC MOSFETs by the introduction of UCC28C56H/L,

UCC28C57H/L and UCC28C58/9, three new sets of

UVLO options allow SiC FET operating reliably while

avoiding thermal runaway. Existing UVLO options of

UCCx8C4x are maintained with improvements on

startup current, operating current and VDD absolute

maximum rating.

The UCC28C5x series is specified for operation

from –40°C to 125°C, and the UCC38C5x series is

specified for operation from 0°C to 85°C.

The table below compares the improvements from

UCCx8C5x to UCCx8C4x.

Device Comparison

PARAMETER

UCCx8C4x

UCCx8C5x

Supply current at 52 kHz

2.3 mA

1.3 mA

Startup current (max)

100 µA

75 µA

VDD abs max

20 V

30 V

6 options

6 options

none

6 options

Smallest package option

VSSOP (8)

VSSOP (8)

The UCCx8C5x family is offered in 8-pin VSSOP

(DGK), and 8-pin SOIC (D) packages.

Device Information

PART NUMBER

PACKAGE(1)

BODY SIZE (NOM)

UCC28C50(2), UCC28C51(2)

UCC28C52(2), UCC28C53

UCC28C54, UCC28C55

UCC38C50(2), UCC38C51(2)

UCC38C52(2), UCC38C53(2)

UCC38C54(2), UCC38C55(2)

SOIC (8)

3.91 mm × 4.90 mm

VSSOP (8)

3.00 mm × 3.00 mm

UCC28C56H,

UCC28C56L(2)

UCC28C57H, UCC28C57L

UCC28C58(2), UCC28C59

SOIC (8)

3.91 mm × 4.90 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

Marketing status for this device is PREVIEW.

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VDD

VREF

GND

FB

CS

OUT

RT/CT

COMP

Simplified Application

UCC28C53, UCC28C54, UCC28C55

UCC28C56H, UCC28C57H, UCC28C57L, UCC28C59

SLUSER8 – JUNE 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. ADVANCE INFORMATION for preproduction products; subject to change

without notice.