SC2442UA

Dual Synchronous Buck Controller

The SC2442UA is a dual synchronous buck controller from Semiment. View the full SC2442UA datasheet below including pinout, electrical characteristics, absolute maximum ratings.

Manufacturer

Semiment

Overview

Part: SC2442/H — Semtech Corporation

Type: Dual Synchronous Buck Controller

Description: High performance dual buck converter controller that can be configured for synchronous buck applications, operating out of phase for reduced input ripple, with a wide input range of 4.5 to 30V for SC2442 and 4.5 to 36V for SC2442H, and programmable clock frequency up to 1 MHz.

Operating Conditions:

Supply voltage: 4.5–30V (SC2442), 4.5–36V (SC2442H)
Operating temperature: -40 to +125 °C
Clock frequency: 0.1 to 1 MHz

Absolute Maximum Ratings:

Max BST1, BST2 to PGND voltage: 38 V (SC2442), 44 V (SC2442H)
Max PVCC, AVCC to PGND voltage: 8 V
Max junction temperature: +125 °C
Max storage temperature: +150 °C

Key Specs:

Undervoltage Lockout Start Threshold (AVCC rising): 4.5 V (min), 4.6 V (typ), 4.75 V (max)
AVCC/PVCC Regulated Voltage: 6.7 V (min), 7 V (typ), 7.3 V (max)
Voltage Feedback Reference (VFB1, VFB2): 0.735 V (min), 0.750 V (typ), 0.765 V (max)
Oscillator Frequency Range: 0.1 MHz (min), 1 MHz (max)
OC1, OC2 Current Limit Sense: -80 mV (min), -105 mV (typ), -125 mV (max)
High Side Gate Drive Source/Sink Current: 0.5 A (typ)
Low Side Gate Drive Source/Sink Current: 0.5 A (typ)
Maximum Duty Cycle: 85 % (min), 94 % (typ)

Features:

Dual output controller
Asynchronous start up mode
Power up sequencing to prevent latch-ups
Out of phase operation for low input ripple
Over current protection
Output down to 0.75V
Vcc regulator with external PNP transistor
Programmable clock frequency up to 1MHz
Two synchronous bucks for high efficiency at high current

Applications:

Point of load converter applications
DSL applications with multiple output voltages
Power management for mixed signal applications
Cable modems and set top boxes

Package:

TSSOP-24

Features

u Dual output controller
u Asynchronous start up mode
u Power up sequencing to prevent latch-ups
u Out of phase operation for low input ripple
u Over current protection
u Output down to 0.75V
u Wide input range, 4.5 to 30V for SC2442 and 4.5 to 36V for SC2442H
u Vcc regulator with external PNP transistor
u Programmable clock frequency up to 1MHz
u Two synchronous bucks for high efficiency at high current
u -40 to +125 Deg C operating temperature
u Small package TSSOP-24

Applications

u Point of load converter applications
u DSL applications with multiple output voltages
u Power management for mixed signal applications
u Cable modems and set top boxes.

Pin Configuration

SC2442UA Pinout

Package: TSSOP-24

Pin Number	Pin Name	Type	Description
1	AVCC	P	Analog Supply Voltage
2	BDI	I	Bootstrap Diode Input
3	VIN	I	Input Voltage
4	OC1	O	Over-Current Detection 1
5	EA1	I	Error Amplifier Input 1
6	FB1	I	Feedback Input 1
7	SS1	I	Soft Start 1
8	BST1	P	Bootstrap Supply 1
9	GD1H	O	Gate Driver Output 1 High
10	PH1	I/O	Phase Node 1
11	GD1L	O	Gate Driver Output 1 Low
12	PGND	P	Power Ground
13	PVCC	P	Power Supply Voltage
14	GD2L	O	Gate Driver Output 2 Low
15	PH2	I/O	Phase Node 2
16	GD2H	O	Gate Driver Output 2 High
17	BST2	P	Bootstrap Supply 2
18	SS2	I	Soft Start 2
19	FB2	I	Feedback Input 2
20	EA2	I	Error Amplifier Input 2
21	OC2	O	Over-Current Detection 2
22	SYNC/EN	I	Synchronization / Enable
23	ROSC	I	Oscillator Resistor
24	AGND	P	Analog Ground

Notes

SC2442UA is a dual-channel synchronous buck controller in TSSOP-24 package
Pin diagram confirms 24-pin configuration with symmetric dual-channel layout (Channel 1: pins 1–12, Channel 2: pins 13–24)
Power pins: AVCC (1), PVCC (13), PGND (12), AGND (24)
Bootstrap pins (BST1, BST2) require external bootstrap capacitors for gate driver operation

Electrical Characteristics

Unless specified: T A = T J = -40 to 125°C, VIN = 24V, V CC = 7V, fc = 500KHz

Parameter	Symbol	Test Conditions	Min	Typ	Max	Unit
Undervoltage Lockout
Start Threshold	V UVLO	AVCC rising	4.5	4.6	4.75	V
UVLO Hysteresis	V HYST	AVCC falling		0.15		V
Power Supply
Operating Current	I QSC	No load, SYNC/EN = Low		8	13	mA
AVCC/PVCC Regulated	AVCC, PVCC	VIN > 8V	6.7	7	7.3	V
BDI Drive Current	I BDI	VIN > AVCC + 2V	3	5		mA

Absolute Maximum Ratings

Exceeding the specifications below may result in permanent damage to the device, or device malfunction.

Operation outside of the parameters specified in the Electrical Characteristics section is not implied.

Parameter	Symbol	Maximum	Units
BST1, BST2 to PGND SC2442 SC2442H	V BST1, V BST2	38 44	V
VIN to PGND SC2442 SC2442H	VIN	30 36	V
BDI to PGND	V BDI	VIN	V
OC1 and OC2 to VIN	VIN - V OC1 , VIN - V OC2	-0.3 to +0.5	V
PVCC, AVCC to PGND	PVCC, AVCC	8	V
BST1 to PH1, BST2 to PH2 GD1H to PH1, GD2H to PH2		-0.3 to 8	V
GD1L, GD2L to PGND		-0.3 to PVCC	V
PGND to AGND		±0.3	V
PH1, PH2 -ve swing wrt PGND (for 100 nS)	V PH1, V PH2	-1	V
All Other Pins to AGND		-0.3 to AVCC	V
Junction Temperature		-40 to +125	°C
Storage Temperature Range		-60 to +150	°C
Lead Temperature (Soldering) 10 Sec.		260	°C

Typical Application

Package Information

Ordering Information

Part Number	Package	Temp. Range (T A )
SC2442ITSTR	TSSOP-24	-40°C to +125°C
SC2442HITSTR	TSSOP-24	-40°C to +125°C

Related Variants

The following components are covered by the same datasheet.

Part Number	Manufacturer	Package
SC2442	Semiment	—
SC2442/H	Semiment	—
SC2442H	Semiment	—
SC2442ITSTR	Semiment	TSSOP-24

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