SC2442/H

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

• 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

• 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.

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

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.