SC1176 PDF даташит
Спецификация SC1176 изготовлена «Semtech Corporation» и имеет функцию, называемую «Dual Synchronous Voltage Mode Controller». |
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Детали детали
Номер произв | SC1176 |
Описание | Dual Synchronous Voltage Mode Controller |
Производители | Semtech Corporation |
логотип |
23 Pages
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SC1176/SC1176A
Dual Synchronous Voltage Mode
Controller with Current Sharing Circuitry
POWER MANAGEMENT
Description
Features
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 VCC. 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.
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 VIN
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 VIN
Independent control for each channel
Independent and separate current limit
2 phases operating opposed for ripple reduction (if
same VIN 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
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POWER MANAGEMENT
Typical Application Circuit
2 Channels with Current Sharing
SC1176/SC1176A
2006 Semtech Corp.
2
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SC1176/SC1176A
POWER MANAGEMENT
Absolute Maximum Rating
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.
Parameter
Symbol
Limits
Units
VCC to GND
PGND to GND
VIN
-0.3 to 15
V
±1 V
BST to GND
-0.3 to 26
V
Thermal Resistance Junction to Case
SOIC
TSSOP
Thermal Resistance Junction to Ambient
SOIC
TSSOP
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering) 10 sec
θJC
θJA
TA
TJ
TSTG
TLEAD
24
27
65
85
0 to 70
0 to 125
-65 to +150
300
°C/W
°C/W
°C
°C
°C
°C
Electrical Characteristics
Unless Specified: VCC = 4.75 to 5.25V, GND = PGND = 0V, FB = VO, 0mV < (CS(+) - (CS(-)) < 60mV , TJ = 25°C
Parameter
Conditions
Min Typ Max Units
Output Voltage
Supply Voltage
Supply Current
Reference Voltage
Reference Voltage Line Regulation
Reference Voltage Load Regulation
Output Line Regulation
Output Load Regulation
Gain (AOL)
Current Limit Voltage
IO = 2A(1), VOUT set to 2.75V
VCC
VCC = 5.0
IREF = 0µA
5V < VCC < 15V
IREF = 0µA to 30µA
5V < VIN < 15V
IO = 0.3A to 15A (1)
VOSENSE to VO
2.65 2.75 2.85
4.2 15
15
0.89 0.9 0.91
0.5
-12
0.5
1
35
60 70 80
V
V
mA
V
%
mV
%
%
dB
mV
Oscillator Frequency
270 300 330 kHz
Oscillator Max Duty Cycle
90 95
%
DH Sink Current
DH - PGND = 3.0V
1.3
A
DH Sink Current
DH - PGND = 2.0V
0.85
A
DH Source Current
BSTH - DH = 3.5V
1.3
A
DH Source Current
BSTH - DH = 2.5V
0.85
A
2006 Semtech Corp.
3
www.semtech.com
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