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SC1176_06

Description
SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20
CategoryPower/power management   
File Size595KB,23 Pages
ManufacturerSEMTECH
Websitehttp://www.semtech.com
Download Datasheet Compare View All

SC1176_06 Overview

SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20

Dual Synchronous Voltage Mode
Controller with Current Sharing Circuitry
POWER MANAGEMENT
Description
The SC1176 is a versatile 2 phase, synchronous, volt-
age mode PWM controller that may be used in two dis-
tinct ways. First, the SC1176 is ideal for applications
where point of use output power exceeds any single in-
put power budget. Alternatively, the SC1176 can be used
as a dual switcher. The SC1176 features a temperature
compensated voltage reference, over current protection
with 50% fold-back and internal level-shifted, high-side
drive circuitry.
In current sharing configuration, the SC1176 can pro-
duce a single output voltage from two separate voltage
sources (which can be different voltage levels) while
maintaining current sharing between the channels. Cur-
rent sharing is programmable to allow loading each input
supply as required by the application.
In dual switcher configuration, two feedback paths are
provided for independent control of the separate out-
puts. The device will provide a regulated output from
flexibly configured inputs (3.3V, 5V, 12V), provided 5V is
present for V
CC
. The two switchers are 180° out of phase
to minimize input and output ripple.
The SC1176A has the phases of the Master and the Slave
inverted.
It offers a different pattern for ripple cancellation and
prevents phase fold back during current limit.
The two chips are pin compatible.
SC1176/SC1176A
Features
300kHz fixed frequency operation
Soft Start and Enable function
Power Good output provided
Over current protection with 50% fold-back
Phase-shifted switchers minimize ripple
High efficiency operation, >90%
Programmable output(s) as low as .9V
Industrial temperature range
SOIC-20 or TSSOP-20 pin Lead free package. This
product is fully WEEE and RoHS compliant
Two Phase, Current Sharing Controller
Flexible, same or separate V
IN
Programmable current sharing
Combined current limit with fold-back
2 phases operating opposed for ripple reduction
Thermal distribution via multi-phase output
Two Independent PWM Controllers
Flexible, same or separate V
IN
Independent control for each channel
Independent and separate current limit
2 phases operating opposed for ripple reduction (if
same V
IN
used)
Applications
Graphics cards
DDR Memory
Peripheral add-in card
SSTL Termination
Dual-Phase power supply
Power supplies requiring two outputs
Revision: June 29, 2006
1
www.semtech.com

SC1176_06 Related Products

SC1176_06 SC1176ASWTR SC1176CSWTR SC1176TSTR SC1176EVB-1 SC1176ATSTR SC1176-2EVB-2
Description SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20 SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO20
Is it lead-free? - Contains lead Contains lead Contains lead - Contains lead -
Is it Rohs certified? - incompatible incompatible incompatible - incompatible -
Parts packaging code - SOIC SOIC TSSOP - TSSOP -
package instruction - MS-013AC, SOIC-20 SOP, SOP20,.4 MO-153AC, TSSOP-20 - TSSOP, TSSOP20,.25 -
Contacts - 20 20 20 - 20 -
Reach Compliance Code - unknow unknow unknow - unknow -
ECCN code - EAR99 EAR99 EAR99 - EAR99 -
Analog Integrated Circuits - Other Types - SWITCHING CONTROLLER SWITCHING CONTROLLER SWITCHING CONTROLLER - SWITCHING CONTROLLER -
control mode - VOLTAGE-MODE VOLTAGE-MODE VOLTAGE-MODE - VOLTAGE-MODE -
Control Technology - PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION - PULSE WIDTH MODULATION -
Maximum input voltage - 15 V 15 V 15 V - 15 V -
Minimum input voltage - 4.2 V 4.2 V 4.2 V - 4.2 V -
Nominal input voltage - 5 V 5 V 5 V - 5 V -
JESD-30 code - R-PDSO-G20 R-PDSO-G20 R-PDSO-G20 - R-PDSO-G20 -
JESD-609 code - e0 e0 e0 - e0 -
length - 12.8 mm 12.8 mm 6.5 mm - 6.5 mm -
Number of functions - 1 1 1 - 1 -
Number of terminals - 20 20 20 - 20 -
Maximum operating temperature - 70 °C 70 °C 70 °C - 70 °C -
Maximum output current - 15 A 15 A 15 A - 15 A -
Package body material - PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY - PLASTIC/EPOXY -
encapsulated code - SOP SOP TSSOP - TSSOP -
Encapsulate equivalent code - SOP20,.4 SOP20,.4 TSSOP20,.25 - TSSOP20,.25 -
Package shape - RECTANGULAR RECTANGULAR RECTANGULAR - RECTANGULAR -
Package form - SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE, THIN PROFILE, SHRINK PITCH - SMALL OUTLINE, THIN PROFILE, SHRINK PITCH -
Peak Reflow Temperature (Celsius) - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED - NOT SPECIFIED -
Certification status - Not Qualified Not Qualified Not Qualified - Not Qualified -
Maximum seat height - 2.65 mm 2.65 mm 1.2 mm - 1.2 mm -
surface mount - YES YES YES - YES -
Switch configuration - PHASE-SHIFT PHASE-SHIFT PHASE-SHIFT - PHASE-SHIFT -
Maximum switching frequency - 330 kHz 330 kHz 330 kHz - 330 kHz -
Temperature level - COMMERCIAL COMMERCIAL COMMERCIAL - COMMERCIAL -
Terminal surface - TIN LEAD TIN LEAD TIN LEAD - TIN LEAD -
Terminal form - GULL WING GULL WING GULL WING - GULL WING -
Terminal pitch - 1.27 mm 1.27 mm 0.65 mm - 0.65 mm -
Terminal location - DUAL DUAL DUAL - DUAL -
Maximum time at peak reflow temperature - NOT SPECIFIED NOT SPECIFIED NOT SPECIFIED - NOT SPECIFIED -
width - 7.5 mm 7.5 mm 4.4 mm - 4.4 mm -
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