SC1405DITSTRT

Manufacturer Part NumberSC1405DITSTRT
DescriptionIC DRIVER MOSF SYNC DUAL TSSOP14
ManufacturerSemtech
SC1405DITSTRT datasheet
 

Specifications of SC1405DITSTRT

ConfigurationHigh and Low Side, SynchronousInput TypePWM
Delay Time20nsCurrent - Peak3A
Number Of Configurations1Number Of Outputs2
High Side Voltage - Max (bootstrap)30VVoltage - Supply4.6 V ~ 6 V
Operating Temperature-40°C ~ 125°CMounting TypeSurface Mount
Package / Case14-TSSOPLead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesSC1405DITSTRTTR  
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POWER MANAGEMENT
Description
The SC1405D is a Dual-MOSFET Driver with an internal
Overlap Protection Circuit to prevent shoot-through. Each
driver is capable of driving a 3000pF load in 15ns rise/
fall time and has ULTRA-LOW propagation delay from in-
put transition to the gate of the power FETs. Adaptive
Overlap Protection circuit ensures that the synchronous
FET does not turn on until the top FET source has reached
a voltage low enough to prevent shoot-through. The de-
lay between the bottom gate going low to the top gate
transitioning high is externally programmable via a ca-
pacitor to minimize dead time. The bottom FET may be
disabled at light loads by keeping S_MOD low to trigger
asynchronous operation, thus saving the bottom FET’s
gate drive current and inductor ripple current.
An internal voltage reference allows threshold adjustment
for an Output Over-Voltage protection circuitry, indepen-
dent of the PWM controller. The device provides over-
voltage protection independent of the PWM feedback
loop with a unique “adaptive OVP” comparator which re-
jects noise but responds quickly to a true OVP situation.
Under-Voltage-Lock-Out circuit is included to guarantee
that both driver outputs are off when Vcc is less than or
equal to 4.4V (typ) at supply ramp up (4.35V at supply
ramp down). A CMOS output provides status indication
of the 5V supply. A low enable input places the IC in stand-
by mode, reducing supply current to less than 10µA.
Typical Application Circuit
Revision: June 8, 2005
High Speed Synchronous Power
MOSFET Smart Driver
Features
Fast rise and fall times (15ns with 3000pf load)
14ns max. Propagation delay (BG going with low)
Adaptive and programmable shoot-through
protection
Adaptive overvoltage protection
Wide input voltage range (4.5V - 25V)
Programmable delay between FETs
Power saving asynchronous mode control
Output overvoltage protection/overtemp shutdown
Under-Voltage lock-out and power ready signal
Less than 10µA stand-by current (EN=low)
Power ready output signal
High frequency (to 1.2MHz) operation allows use of
small inductors and low cost caps in place of
electrolytics
TSSOP-14 package
Applications
High Density/Fast transient microprocessor power
supplies
Motor Drives/Class-D amps
High efficiency portable computers
1
SC1405D
PRELIMINARY
www.semtech.com

SC1405DITSTRT Summary of contents

  • Page 1

    ... Less than 10µA stand-by current (EN=low) Power ready output signal High frequency (to 1.2MHz) operation allows use of small inductors and low cost caps in place of electrolytics TSSOP-14 package Applications High Density/Fast transient microprocessor power supplies Motor Drives/Class-D amps High efficiency portable computers 1 SC1405D PRELIMINARY www.semtech.com ...

  • Page 2

    ... 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 NOTE: (1) Specification refers to application circuit. Electrical Characteristics - DC Operating Specifications Unless otherwise specified: -40 < T < 125° 2005 Semtech Corp < ° ° 6V; 4V < V < 26V CC BST < µ SC1405D ° ° ...

  • Page 3

    ... POWER MANAGEMENT Electrical Characteristics - DC Operating Specifications 2005 Semtech Corp < < ° < < ° SC1405D µ µ www.semtech.com ...

  • Page 4

    ... POWER MANAGEMENT Electrical Characteristics - AC Operating Specifications NOTE: (1) This device is ESD sensitive. Use of standard ESD handling precautions is required. 2005 Semtech Corp < > > > > < < SC1405D www.semtech.com µ s µ s µ s µ ...

  • Page 5

    ... POWER MANAGEMENT Application Circuit - TSSOP-14 INPUT POWER +5V + 10uF,6.3V .1uF P_READY << PWM IN >> (20KHz-1MHz) 47pF DSPS_DR << <<< Output Feedback to PWM Controller Timing Diagram 2005 Semtech Corp 1N5819 .22uF 8 14 Vcc BST 3 GND PRDY 2 DRN DELAY OVP_S 11 2.2 DSPS_DR 5 10 S_MOD ...

  • Page 6

    ... NOTE: NOTE: NOTE: NOTE: NOTE: (1) All logic level inputs and outputs are open collector TTL compatible. 2005 Semtech Corp. Ordering Information Notes: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) Lead free product. This product is fully WEEE and RoHS compliant. ...

  • Page 7

    ... The timing diagram demonstrates the sequence of events by which the top and bottom drive signals are applied. The shoot-through protection is implemented 2005 Semtech Corp. by holding the bottom FET off until the voltage at the phase node (intersection of top FET source, the output inductor and the bottom FET’s drain) has dropped below 1V ...

  • Page 8

    ... Vspike. The selection of the bottom FET must be done with at- tention paid to the Crss/Ciss ratio. A low ratio reduces 2005 Semtech Corp. the Miller feedback and thus reduces Vspike. Also FETs with higher Turn-on threshold voltages will conduct at a higher voltage and will not turn on during the spike. The ...

  • Page 9

    ... FET’s body diode will need to conduct in asynchronous mode. The high voltage drop of this diode must be con- sidered when determining the criteria for this mode of operation. 2005 Semtech Corp. DSPS DR This pin produces an output which is a logical duplicate of the bottom FET’s gate drive, if S-MOD is held High. ...

  • Page 10

    ... Typical Characteristics Performance diagrams, Application Evaluation Board. PIN Descriptions PIN Descriptions V = 12V 1.6V. Top FET = IR7811 FDB7030(BL) Qgd = 23nc IN OUT 2005 Semtech Corp. Timing diagram: Ch1: CO input Ch2: TG drive Ch3: BG non-overlap drive Ch4: phase node Iout = 20A (10A/phase) Refer to Eval. Schematic (fig.3) ...

  • Page 11

    ... POWER MANAGEMENT Typical Characteristics (Cont.) 600.00 500.00 400.00 300.00 200.00 100.00 0.00 -25 Typical Delay vs. Overdrive (T=25C) 10000 1000 100 10 2005 Semtech Corp. SC1405D OVP Delay vs. Temperature - Temperature (C) 50mV Overdrive 100mV Overdrive Overdrive (mV) 11 SC1405D 75 95 115 135 1000 www.semtech.com ...

  • Page 12

    ... POWER MANAGEMENT Evaluation Board Schematic 2005 Semtech Corp SC1405D www.semtech.com ...

  • Page 13

    ... N/2 TIPS B aaa C SEATING PLANE C SIDE VIEW NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS 3. OR GATE BURRS. 4. REFERENCE JEDEC STD MO-153, VARIATION AB-1. 2005 Semtech Corp. D DIM aaa bbb ...

  • Page 14

    ... POWER MANAGEMENT Land Pattern - TSSOP-14 X (C) P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. Contact Information Phone: (805)498-2111 FAX (805)498-3804 2005 Semtech Corp. DIM INCHES (.222 Semtech Corporation Power Management Products Division ...