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Linear Technology Electronic Components Datasheet

LTC3731CUH Datasheet

Synchronous Buck Switching Regulator Controller

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LTC3731
3-Phase, 600kHz,
Synchronous Buck Switching
Regulator Controller
FEATURES
DESCRIPTION
n 3-Phase Current Mode Controller with Onboard
MOSFET Drivers
n ±5% Output Current Matching Optimizes Thermal
Performance and Size of Inductors and MOSFETs
n Differential Amplifier Accurately Senses VOUT
n ±1% VREF Accuracy Over Temperature
n VOUT Range: 0.6V to 5.5V without Diffamp
n VOUT Range: 0.6V to (VCC – 1.2V) with Diffamp
n 250kHz to 600kHz Per Phase, PLL, Fixed Frequency
n PWM, Stage Shedding™ or Burst Mode® Operation
n OPTI-LOOP® Compensation Minimizes COUT
n Adjustable Soft-Start Current Ramping
n Short-Circuit Shutdown Timer with Defeat Option
n Overvoltage Soft Latch
n Adjustable Undervoltage Lockout Threshold
n Selectable Phase Output for Up to 12-Phase Operation
n Available in 5mm × 5mm QFN and 36-Pin Narrow
(0.209") SSOP Packages
APPLICATIONS
n Desktop Computers and Servers
n High Performance Notebook Computers
n High Output Current DC/DC Power Supplies
The LTC®3731 is a PolyPhase® synchronous step-down
switching regulator controller that drives all N-channel
external power MOSFET stages in a phase-lockable fixed
frequency architecture. The 3-phase controller drives its
output stages with 120° phase separation at frequencies
of up to 600kHz per phase to minimize the RMS current
losses in both the input and output filter capacitors. The
3‑phase technique effectively triples the fundamental fre-
quency, improving transient response while operating each
controller at an optimal frequency for efficiency and ease of
thermal design. Light load efficiency is optimized by using a
choice of output Stage Shedding or Burst Mode operation.
A differential amplifier provides true remote sensing of
both the high and low side of the output voltage at the
point of load.
Soft-start and a defeatable, timed short-circuit shutdown
protect the MOSFETs and the load. Current foldback
provides protection for the external MOSFETs under
short-circuit or overload conditions.
L, LT, LTC, LTM, Bust Mode, OPTI-LOOP, PolyPhase, Linear Technology and the Linear logo
are registered and Stage Shedding is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
5481178, 5929620, 6177787, 6144194, 6100678, 5408150, 6580258, 6462525, 630466,
5705919.
TYPICAL APPLICATION
VCC
4.5V TO 7V
10µF
0.1µF
SW3 SW2 SW1
POWER GOOD INDICATOR
OPTIONAL SYNC IN
VCC
TG1
LTC3731 SW1
BOOST1
BOOST2
BG1
BOOST3
SENSE1+
SENSE1
PGOOD
TG2
PLLIN
SW2
PLLFLTR
BG2
36k
VIN
12k
680pF
UVADJ
PGND
SENSE2+
SENSE2
5k
7.5k
6.04k
ITH
0.01µF
100pF
RUN/SS
SGND
EAIN
DIFFOUT
IN
IN+
TG3
SW3
BG3
SENSE3+
SENSE3
0.8µH
0.003Ω
VIN
+
5V TO 28V
22µF
35V
VIN
0.8µH
0.003Ω
VOUT
1.35V
55A
VIN
0.8µH
0.003Ω
+ COUT
470µF
4V
3731 F01
Figure 1. High Current Triple Phase Step-Down Converter
3731fc
1


Linear Technology Electronic Components Datasheet

LTC3731CUH Datasheet

Synchronous Buck Switching Regulator Controller

No Preview Available !

LTC3731
ABSOLUTE MAXIMUM RATINGS (Note 1)
Topside Driver Voltages (BOOSTn).............. 38V to –0.3V
Switch Voltage (SWn).................................... 32V to –5V
Boosted Driver Voltage (BOOSTn – SWn)..... 7V to –0.3V
Peak Output Current < 1ms (TGn, BGn).......................5A
Supply Voltages (VCC, VDR), PGOOD
Pin Voltage.................................................... 7V to –0.3V
RUN/SS, PLLFLTR, PLLIN, UVADJ,
FCB Voltages ...............................................VCC to –0.3V
SENSE+, SENSE– Voltages........................ 5.5V to –0.3V
ITH Voltage ................................................ 2.4V to –0.3V
Operating Ambient Temperature Range
LTC3731C................................................. 0°C to 70°C
LTC3731I...............................................–40°C to 85°C
Junction Temperature (Note 2).............................. 125°C
Storage Temperature Range................... –65°C to 125°C
Lead Temperature G Package (Soldering, 10 sec).. 300°C
Peak Body Temperature UH Package.................... 240°C
PIN CONFIGURATION
TOP VIEW
VCC 1
PLLIN 2
PLLFLTR 3
FCB 4
IN+ 5
IN6
DIFFOUT 7
EAIN 8
SGND 9
SENSE1+ 10
SENSE111
SENSE2+ 12
SENSE213
SENSE314
SENSE3+ 15
RUN/SS 16
ITH 17
UVADJ 18
36 CLKOUT
35 PGOOD
34 BOOST1
33 TG1
32 SW1
31 BOOST2
30 TG2
29 SW2
28 VDR
27 BG1
26 PGND
25 BG2
24 BG3
23 SW3
22 TG3
21 BOOST3
20 PHASMD
19 SGND2
G PACKAGE
36-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W, θJC = 32°C/W
TOP VIEW
32 31 30 29 28 27 26 25
IN1
24 BOOST2
DIFFOUT 2
23 TG2
EAIN 3
SENSE1+ 4
SENSE15
SENSE2+ 6
SENSE27
SENSE38
33
SGND
22 SW2
21 VCC
20 BG1
19 PGND
18 BG2
17 BG3
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 33) IS SGND, MUST BE SOLDERED TO PCB
3731fc
2


Part Number LTC3731CUH
Description Synchronous Buck Switching Regulator Controller
Maker Linear
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