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LTC3716 Datasheet(PDF) 1 Page - Linear Technology

Part No. LTC3716
Description  2-Phase, 5-Bit VID, Current Mode, High Efficiency, Synchronous Step-Down Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC3716 Datasheet(HTML) 1 Page - Linear Technology

 
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1
LTC3716
The LTC
®3716 is a 2-phase, VID programmable, synchro-
nous step-down switching regulator controller that drives
two N-channel external power MOSFET stages in a fixed fre-
quency architecture. The 2-phase controller drives its two
output stages out of phase at frequencies up to 300kHz to
minimize the RMS ripple currents in both input and output
capacitors. The 2-phase technique effectively multiplies the
fundamental frequency by two, improving transient re-
sponse while operating each channel at an optimum fre-
quency for efficiency. Thermal design is also simplified.
An operating mode select pin (FCB) can be used to regu-
late a secondary winding or select among three modes
including Burst Mode
TM operation for highest efficiency. An
internal differential amplifier provides true remote sensing
of the regulated supply’s positive and negative output ter-
minals as required in high current applications.
The RUN/SS pin provides soft-start and optional timed,
short-circuit shutdown. Current foldback limits MOSFET
dissipation during short-circuit conditions when the
overcurrent latchoff is disabled. OPTI-LOOP compensation
allows the transient response to be optimized for a wide
range of output capacitors and ESR values.
2-Phase, 5-Bit VID,
Current Mode, High Efficiency,
Synchronous Step-Down
Switching Regulator
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP and Burst Mode are trademarks of Linear Technology Corporation.
Figure 1. High Current Dual Phase Step-Down Converter
s
Mobile Computer CPU Supply
s
Output Stages Operate Antiphase Reducing Input
and Output Capacitance Requirements and Power
Supply Induced Noise
s
Dual Input Supply Capability for Load Sharing
s
5-Bit Mobile VID Code: VOUT = 0.6V to 1.75V
s
±1% Output Voltage Accuracy
s
True Remote Sensing Differential Amplifier
s
Power Good Output Voltage Monitor
s
Supports Active Voltage Positioning
s
Current Mode Control Ensures Current Sharing
s
OPTI-LOOP
TM Compensation Minimizes COUT
s
Three Operational Modes: PWM, Burst and Cycle Skip
s
Programmable Fixed Frequency: 150kHz to 300kHz
s
Wide VIN Range: 4V to 36V Operation
s
Adjustable Soft-Start Current Ramping
s
Internal Current Foldback and Short-Circuit Shutdown
s
Overvoltage Soft Latch Eliminates Nuisance Trips
s
Available in 36-Lead Narrow SSOP Package
3716 F01
TG1
BOOST1
SW1
BG1
PGND
SENSE1+
SENSE1
TG2
BOOST2
SW2
BG2
INTVCC
SENSE2+
SENSE2
VIN
RUN/SS
FCB
VDIFFOUT
ITH
ATTENIN
ATTENOUT
EAIN
VID0–VID4
VOS
VOS
+
LTC3716
SGND
PGOOD
0.1
µF
220pF
5 VID BITS
S
S
3.3k
10
µF
35V
×4
+
COUT
1000
µF
4V
×2
VOUT
0.6V TO 1.75V
40A
1
µH
0.002
0.002
VIN
5V TO 28V
1
µH
0.47
µF
0.47
µF
D1
D2
10
µF
4
3
2
1
4
3
2
1
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATIO


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