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SC410987P, SC411, SC411138CP

Table of contents:
Info of SC410987P
Info of SC411
Info of SC411138CP

SC410987P, SC411, SC411138CP Selling Leads, Datasheet

MFG:DIP Package Cooled:DIP D/C:1997

SC410987P, SC411, SC411138CP Datasheet download

Five Points

Part Number: SC410987P

MFG: DIP

Package Cooled: DIP

D/C: 1997

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SC411 General Description

The SC411 is a constant on-time synchronous buck PWM controller in a space-saving MLPQ package intended for use in notebook computers and other battery operated portable devices. Features include high effi ciency and a fast dynamic response with no minimum on-time. The excellent transient response means that SC411 based solutions will require less output capacitance than competing fi xed frequency converters.

The switching frequency is constant until a step-in load or line voltage occurs. During this 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, Powersave Mode enables the SC411 to skip PWM pulses for better effi ciency.

The output voltage can be adjusted from 0.5V to VCCA. A frequency setting resistor sets the on-time for the controller. 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 under-voltage protection, a Power Good output and soft discharge upon shutdown.

SC411 Maximum Ratings

Parameter	Symbol	Maximum	Units
TON to VSSA		-0.3 to +25.0	V
DH, BST to PGND		-0.3 to +30.0	V
LX to PGND		-2.0 to +25.0	V
PGND to VSSA		-0.3 to +0.3	V
BST to LX		-0.3 to +6.0	V
DL, ILIM, VDDP to PGND		-0.3 to +6.0	V
EN/PSV, FB, PGD, VCCA, VOUT to VSSA		-0.3 to +6.0	V
VCCA to EN/PSV, FB, PGD, VOUT		-0.3 to +6.0	V
Thermal Resistance Junction to Ambient(2)	_JA	31	°C/W
Operating Junction Temperature Range	T_J	-40 to +125	°C
Storage Temperature Range	T_STG	-65 to +150	°C
IR Refl ow (Soldering) 10s to 30s	T_PKG	260	°C

Notes:
1) This device is ESD sensitive. Use of standard ESD handling precautions is required.
2) Calculated from package in still air, mounted to 3" to 4.5", 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards.

SC411 Features

Constant on-time for fast dynamic response
Programmable VOUT range = 0.5 VCCA
VBAT 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
Powersave option
Over-voltage/under-voltage fault protection
10A typical shutdown current
Low quiescent power dissipation
Power good indicator
1.2% reference
Integrated gate drivers with soft switching
Enable pin
16 pin MLPQ (4mm x 4mm)
Output soft discharge upon shutdown

SC411 Typical Application

Notebook Computers
CPU/IO Supplies
Handheld Terminals and PDAs
LCD Monitors
Network Power Supplies

SC411 Connection Diagram

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