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SC1485, SC14851TS, SC1485AITST

Table of contents:
Info of SC1485
Info of SC14851TS
Info of SC1485AITST

SC1485, SC14851TS, SC1485AITST Selling Leads, Datasheet

MFG:SEMTECH Package Cooled:SSOP D/C:07+

SC1485, SC14851TS, SC1485AITST Datasheet download

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Part Number: SC1485

MFG: SEMTECH

Package Cooled: SSOP

D/C: 07+

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SC1485 General Description

The SC1485 is a dual output constant on synchronousbuck PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and a fast dynamic response with no minimum on time. The excellent transient response, means that SC1485 based solutions will require less output capacitance than competing fixed frequency converters.

The frequency is constant until a step in load or line voltage occurs at which time the pulse density and frequency will increase or decrease to counter the change in output or input voltage. After the transient event, the controller frequency will return to steady state operation. At light loads, Power-Save Mode enables the SC1485 to skip PWM pulses for better efficiency.

Each output voltage can be independently adjusted from 0.5V to VCCA. Two frequency setting resistors set the on-time for each buck controller. The frequency can thus be tailored to minimize crosstalk. The integrated gate drivers feature adaptive shoot-through protection and soft switching. Additional features include cycle-by-cycle current limit, digital soft-start, over-voltage and undervoltage protection, and a PGOOD output for each controller.

SC1485 Maximum Ratings

Parameter	Symbol	Maximum	Units
TON1 to AGND1, TON2 to AGND2		-0.3 to +25.0	V
DH1,BST1 to AGND1 and DH2,BST2 to AGND2		-0.3 to +30.0	V
LX1 to AGND1 and LX2 to AGND2		-2.0 to +25.0	V
AGND1 to PGND1, and AGND2 to PGND2		-0.3 to +0.3	V
BST1 to LX1 and BST2 to LX2		-0.3 to +6.0	V
VCCA1, VDDP1 to AGND1 and VCCA2, VDDP2 to AGND2		-0.3 to +6.0	V
FB1, PGOOD1, EN/PSV1, ILIM1, VOUT1, DL1 to PGND1		-0.3 to +6.0	V
FB2, PGOOD2, EN/PSV2, ILIM2, VOUT2, DL2 to PGND2		-0.3 to +6.0	V
Thermal Resistance Junction to Ambient⁽⁵⁾	_JA	37	/W
Operating Junction Temperature Range	T_J	-40 to +125
Storage Temperature Range	T_STG	-65 to +150
Lead Temperature (Soldering) 10 Sec	T_LEAD	300

SC1485 Features

`Constant on-time for fast dynamic response
`Programmable VOUT range = 0.5 VCCA
`VIN Range = 1.8V 25V
`DC current sense using low-side RDS(ON) sensing or sense resistor
`Resistor programmable frequency
`Cycle-by-cycle current limit
`Digital soft-start
`Separate PSAVE option for each switcher
`Over-voltage/Under-voltage fault protection
`10uA Typical shutdown current
`Low quiescent power dissipation
`Two PGOOD indicators
`1% Reference (2% system DC accuracy)
`Efficiency >90%
`Integrated gate drivers with soft switching
`Separate enables
`28 Lead TSSOP
`Industrial temperature range

SC1485 Typical Application

·Notebook computers
·CPU I/O supplies
·Handheld terminals and PDAs
·LCD monitors
·Network power supplies

SC1485 Connection Diagram

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