(China (Mainland))
Product Summary
The sc411mltrt 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 the sc411mltrt based solutions will require less output capacitance than competing fi xed frequency converters. The output voltage can be adjusted from 0.5V to VCCA. A frequency setting resistor sets the on-time for the controller. The sc411mltrt features 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. Applications are (1)Notebook Computers; (2)CPU/IO Supplies; (3)Handheld Terminals and PDAs; (4)LCD Monitors; (5)Network Power Supplies.
Parametrics
sc411mltrt absolute maximum ratings: (1)TON to VSSA: -0.3 to +25.0 V; (2)DH, BST to PGND: -0.3 to +30.0 V; (3)LX to PGND: -2.0 to +25.0 V; (4)PGND to VSSA: -0.3 to +0.3 V; (5)BST to LX: -0.3 to +6.0 V; (6)DL, ILIM, VDDP to PGND: -0.3 to +6.0 V; (7)EN/PSV, FB, PGD, VCCA, VOUT to VSSA: -0.3 to +6.0 V; (8)VCCA to EN/PSV, FB, PGD, VOUT: -0.3 to +6.0 V; (9)Thermal Resistance Junction to Ambient(2)(2)θJA: 31 °C/W; (10)Operating Junction Temperature Range TJ: -40 to +125 °C; (11)Storage Temperature Range TSTG: -65 to +150 °C; (12)IR Refl ow (Soldering)10s to 30s TPKG: 260 °C.
Features
sc411mltrt features: (1)Constant on-time for fast dynamic response; (2)Programmable VOUT range = 0.5 – VCCA; (3)VBAT range = 1.8V – 25V; (4)DC current sense using low-side RDS(ON)Sensing or sense resistor; (5)Resistor programmable frequency; (6)Cycle-by-cycle current limit; (7)Digital soft-start; (8)Powersave option; (9)Over-voltage/under-voltage fault protection; (10)10μA typical shutdown current; (11)Low quiescent power dissipation; (12)Power good indicator; (13)1.2% reference; (14)Integrated gate drivers with soft switching; (15)Enable pin; (16)16 pin MLPQ (4mm x 4mm); (17)Output soft discharge upon shutdown.
Diagrams
