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LTC1709-8 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC1709-8
Description  2-Phase, 5-Bit VID,Current Mode, High Efficiency,Synchronous Step-Down Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1709-8 Datasheet(HTML) 1 Page - Linear Technology

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1
LTC1709-8/LTC1709-9
FEATURES
DESCRIPTIO
APPLICATIO S
TYPICAL APPLICATION
, LTC and LT are registered trademarks of Linear Technology Corporation.
OPTI-LOOP is a trademark of Linear Technology Corporation.
The LTC
®1709-8/LTC1709-9 are 2-phase, VID program-
mable, synchronous step-down switching regulator con-
trollers that drive two all N-channel external power MOSFET
stages in a fixed frequency architecture. The 2-phase
controller drives its two output stages out of phase at
frequencies from 150kHz 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 response while
operating each channel at an optimum frequency for
efficiency. Thermal design is also simplified.
An internal differential amplifier provides true remote
sensing of the regulated supply’s positive and negative
output terminals as required for 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 compensa-
tion allows the transient response to be optimized for a
wide range of output capacitors and ESR values. The
LTC1709-8/LTC1709-9 implement two different VID
tables compliant with VRM8.4 and VRM9.0 respectively.
Figure 1. High Current 2-Phase Step-Down Converter
s
Workstations
s
Internet Servers
s
Large Memory Arrays
s
DC Power Distribution Systems
s
Single Controller Operates Two Output Stages
Antiphase Reducing Required Input Capacitance
and Power Supply Induced Noise
s
Two 5-Bit Desktop VID Codes:
LTC1709-8 For VRM8.4 (VOUT from 1.3V to 3.5V)
LTC1709-9 For VRM9.0 (VOUT from 1.1V to 1.85V)
s
Current Mode Control Ensures Best Current Sharing
s
True Remote Sensing Differential Amplifier
s
Power Good Output Indicator
s
OPTI-LOOP
TM Compensation Minimizes COUT
s
Programmable Fixed Frequency: 150kHz to 300kHz
s
±1% Output Voltage Accuracy
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
Low Shutdown Current: 20
µA
s
Available in 36-Lead Narrow SSOP Package
17097 F01
TG1
BOOST1
SW1
BG1
PGND
SENSE1+
SENSE1
TG2
BOOST2
SW2
BG2
INTVCC
SENSE2+
SENSE2
VIN
RUN/SS
VDIFFOUT
ITH
ATTENIN
ATTENOUT
EAIN
VID0–VID4
VOS
VOS
+
LTC1709-8
SGND
PGOOD
0.1
µF
220pF
5 VID BITS
S
S
3.3k
10
µF
35V
×4
+
+
COUT
1000
µF
4V
×2
VOUT
1.3V TO 3.5V
40A
1
µH
0.002
0.002
VIN
5V TO 28V
1
µH
0.47
µF
0.47
µF
10
µF
2-Phase, 5-Bit VID,
Current Mode, High Efficiency,
Synchronous Step-Down Switching Regulators


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