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SC415 Dataheets PDF



Part Number SC415
Manufacturers Semtech Corporation
Logo Semtech Corporation
Description Dual Synchronous Buck Controller
Datasheet SC415 DatasheetSC415 Datasheet (PDF)

SC415 Dual Synchronous Buck Controller POWER MANAGEMENT Features VIN Range 3-25V Outputs Adjustable from 0.75 to 5.25V, „ or Preset Output Voltages: VOUT1 = 1.8 or 1.5V VOUT2 = 1.25 or 1.05V „ Low Shutdown Power „ Constant On-Time for Fast Dynamic Response www.DataSheet4U.com „ Adjustable Switching Frequency „ Separated Frequencies for Minimal Switching Interaction: VOUT1 = up to 600kHz VOUT2 = up to 720kHz „ Power Save or Continuous Operation at Light Load „ Adjustable Soft-start Rates for Each.

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SC415 Dual Synchronous Buck Controller POWER MANAGEMENT Features VIN Range 3-25V Outputs Adjustable from 0.75 to 5.25V, „ or Preset Output Voltages: VOUT1 = 1.8 or 1.5V VOUT2 = 1.25 or 1.05V „ Low Shutdown Power „ Constant On-Time for Fast Dynamic Response www.DataSheet4U.com „ Adjustable Switching Frequency „ Separated Frequencies for Minimal Switching Interaction: VOUT1 = up to 600kHz VOUT2 = up to 720kHz „ Power Save or Continuous Operation at Light Load „ Adjustable Soft-start Rates for Each Output „ Soft-Shutdown for Each Output „ Over-Voltage and Under-Voltage Fault Protection „ Cycle-by-Cycle Valley Current Limit „ DC Current Sense Using Low-Side RDSON Sensing, or RSENSE in Source of Low-Side MOSFET for Greater Accuracy „ Separate Power Good Outputs „ Separate Enable/Power Save Inputs „ 3.1A Non-Overlapping Gate Drive „ SmartDriveTM for High-Side MOSFET „ MLP 4x4 24 Pin Package „ Industrial Temperature Range „ „ Description The SC415 is a versatile, constant on-time, pseudo fixedfrequency, dual synchronous buck PWM controller intended for notebook computers and other battery operated portable devices. The SC415 contains all the features needed to provide cost-effective control of two independent switchmode power supplies. The two DC outputs are adjustable from 0.75V to 5.25V. Additional features for each output include cycle-bycycle current limit, voltage soft-start, under-voltage and over-voltage protection, programmable over-current protection, soft shutdown, selectable power save and non-overlapping gate drive. The SC415 provides two enable/power save inputs, two soft-start inputs, two power good outputs and an on-time adjust input. The constant on-time topology provides fast dynamic response. The excellent transient response means that SC415 based solutions require less output capacitance than competing fixed-frequency converters. Switching frequency is constant until a step in load or line voltage occurs, at which time the pulse density and frequency moves to counter the change in output voltage. After the transient event, the controller frequency returns to steady state operation. At light loads with power save enabled, the SC415 reduces switching frequency for improved efficiency. • • • • Applications „ „ Notebook and Sub-Notebook Graphics Voltage Controllers „ Tablet PCs „ Embedded Applications Oct 08, 2007 © 2007 Semtech Corporation 1 SC415 Typical Application Circuit www.DataSheet4U.com VIN PGD1 Q1 PGD2 Q3 VIN CIN1 CIN2 24 23 22 21 20 19 PGD1 PGD2 DH1 ILIM1 ILIM2 DH2 VOUT1 L1 D2 100NF RLIM1 RLIM2 PAD LX2 BST2 VDD2 25 18 17 16 VOUT2 100NF D3 L2 1 +5V + COUT1 Q2 2 3 4 5 LX1 BST1 VDD1 DL1 EN1 +5V + Q4 COUT2 SC415 VOUT1 VOUT2 TON RTN DL2 EN2 SS2 15 14 1UF 13 1UF 10NF EN1 VOUT1 6 SS1 FB1 FB2 10NF EN2 VOUT2 10 11 1NF 12 RTON VIN 7 8 9 2 SC415 Pin Configuration PGD1 PGD2 ILIM1 ILIM2 DH1 DH2 Ordering Information Device SC415MLTRT(1) SC415EVB Package MLPQ-24 4X4 Evaluation Board 24 LX1 BST1 www.DataSheet4U.com 19 18 TOP VIEW LX2 BST2 VDD2 1 VDD1 DL1 Notes: (1) Available in tape and reel only. A reel contains 3,000 devices. (2) Available in lead-free package only. Device is WEEE and RoHS compliant. SC415 DL2 GND (PAD) 6 7 VOUT1 RTN TON FB2 FB1 EN1 SS1 EN2 13 12 VOUT2 SS2 MLPQ24: 4x4 24 LEAD Marking Information SC415 yyww xxxxx xxxxx nnnn = Part Number (example: SC415 yyww = Date Code (example: 0652) xxxxx = Semtech Lot No. (example: 09010 xxxxx 01-10) 3 SC415 Absolute Maximum Ratings DHx, BSTx, GND (DC) ……………………………… -03 to +30V DHx, BSTx to GND (transient - 100nsec max) ………… -2.0 to +33V LXx, TON to GND (DC) ……………………………… -0.3 to +25V LXx, TON to GND (transient - 100nsec max) ………… -2.0 to +28V BST1 to LX1, BST2 to LX2 (DC) ……………………… -0.3 to +6.0V BST1 to LX1, BST2 to LX2 (transient - 100nsec max) … 0.3 to +7.5V DLx to GND (DC) ……………………………………-0.3 to +6.0V www.DataSheet4U.com Thermal Information Junction to Ambient(1) ……………………………… 29°C/W Storage Temperature Range ……………… -60 to +150°C Operating Junction Temperature Range … -40 to +125°C Lead Temperature (Soldering) 10 sec ………………… 260°C GND to RTN ……………………………………… -0.3 to +0.3V VDDx to RTN ……………………………………… -0.3 to +6.0V ENx, FBx, ILIMx, PGDx, SSx, VOUTx to RTN…… -0.3 to VDDx +0.3V Peak IR Reflow Temperature(10-40sec)………………. ESD Protection Level(2) ………………………………… 260°C 2kV Exceeding the above specifications may result in permanent damage to the device or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not recommended. NOTES(1) Calculated from package in still air, mounted to 3” x 4.5”, 4 layer FR4 PCB with thermal vias under the exposed pad per JESD51 standards. (2) Tested according to JEDEC standard JESD22-A114-B. Electrical Characteristics Test Conditions: VIN = 15V, VOUT = 1.5V, TA = 25 oC, 0.1% resistor dividers; RTON = 1Meg; VDD1/2 = 5.0V; GND connects to PAD pin. 25°C Parameter Input Supplies VIN Input Voltage VDD.


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