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Linear Technology Electronic Components Datasheet

LTC3732 Datasheet

Synchronous Buck Switching Regulator Controller

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LTC3732 pdf
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LTC3732
3-Phase, 5-Bit VID,
600kHz, Synchronous Buck
Switching Regulator Controller
FEATURES
DESCRIPTIO
s 3-Phase Current Mode Controller with
Onboard MOSFET Drivers
s ±5% Output Current Matching Optimizes Thermal
Performance and Size of Inductors and MOSFETs
s 4.5V VCC 7V; 4.5V VIN 32V
s Differential Amplifier Accurately Senses VOUT
s Reduced Input and Output Capacitance
s Reduced Power Supply Induced Noise
s VID DAC Programmable from 1.1V to 1.85V
(VRM9.0/9.1)
s ±10% Power Good Output Indicator
s 250kHz to 600kHz Per Phase, PLL, Fixed Frequency
s PWM, Stage SheddingTM or Burst Mode® Operation
s OPTI-LOOP® Compensation Minimizes COUT
s Adjustable Soft-Start Current Ramping
s Short-Circuit Shutdown Timer with Defeat Option
s Overvoltage Soft Latch
s Small 36-Lead Narrow (0.209") SSOP Package
s QFN 5mm × 7mmU38-Lead Package
APPLICATIO S
s Desktop Computers
s High Performance Notebook Computers
s High Output Current DC/DC Power Supplies
The LTC®3732 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 high efficiency
and ease of thermal design. Light load efficiency is opti-
mized by using a choice of output Stage Shedding or Burst
Mode technology.
A differential amplifier provides true remote sensing of both
the high and low side of the output voltage at load points.
Soft-start and a defeatable, timed short-circuit shutdown
protect the MOSFETs and the load. A foldback current
circuit also provides protection for the external MOSFETs
under short-circuit or overload conditions.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Burst Mode, OPTI-LOOP and PolyPhase are registered trademarks of Linear Technology
Corporation. Stage Shedding is a trademark of Linear Technology Corporation
TYPICAL APPLICATIO
VCC
4.5V TO 7V
10µF
0.1µF
SW3 SW2 SW1
POWER GOOD INDICATOR
OPTIONAL SYNC IN
5 VID BITS
680pF
5k
0.1µF
100pF
VCC TG1
LTC3732 SW1
BOOST1
BOOST2
BG1
BOOST3
SENSE1+
SENSE1
PGOOD
PLLIN
PLLFLTR
VID0-VID4
ITH
RUN/SS
SGND
EAIN
IN
IN+
TG2
SW2
BG2
PGND
SENSE2+
SENSE2
TG3
SW3
BG3
SENSE3+
SENSE3
1µH 0.003
VIN
+ 5V TO 28V
22µF
35V
VIN
1µH
0.003
VOUT
1.1V TO 1.85V
55A
VIN
1µH
0.003
+ COUT
470µF
4V
3732 F01
Figure 1. High Current Triple Phase Step-Down Converter
3732f
1


Linear Technology Electronic Components Datasheet

LTC3732 Datasheet

Synchronous Buck Switching Regulator Controller

No Preview Available !

LTC3732 pdf
LTC3732
ABSOLUTE AXI U RATI GS (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 Voltage (VCC), PGOOD
Pin Voltage .................................................. 7V to –0.3V
RUN/SS, PLLFLTR, PLLIN, FCB Voltages .. VCC to –0.3V
ITH Voltage ................................................ 2.4V to –0.3V
Operating Ambient Temperature Range ....... 0°C to 70°C
Junction Temperature (Notes 2, 3, 7) ................... 125°C
Storage Temperature Range ..................–65°C to 150°C
Lead Temperature (Soldering, 10 sec)
SSOP Package .................................................. 300°C
Reflow Peak Body Temperature
QFN Package .................................................... 240°C
UW U
PACKAGE/ORDER I FOR ATIO
VID1 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
VID2 18
TOP VIEW
36 VID0
35 PGOOD
34 BOOST1
33 TG1
32 SW1
31 BOOST2
30 TG2
29 SW2
28 VCC
27 BG1
26 PGND
25 BG2
24 BG3
23 SW3
22 TG3
21 BOOST3
20 VID4
19 VID3
G PACKAGE
36-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 95°C/W
ORDER PART
NUMBER
LTC3732CG
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
IN+ 1
IN2
DIFFOUT 3
EAIN 4
PADDLE 5
SGND 6
SENSE1+ 7
SENSE18
SENSE2+ 9
SENSE210
SENSE311
SENSE3+ 12
38 37 36 35 34 33 32
UNDERSIDE
PADDLE
IS SGND
13 14 15 16 17 18 19
31 TG1
30 SW1
29 BOOST2
28 TG2
27 SW2
26 VCC
25 DRVCC
24 BG1
23 PGND
22 BG2
21 BG3
20 SW3
UHF PACKAGE
38-LEAD (7mm × 5mm) PLASTIC QFN
PADDLE IS SGND
(MUST BE CONNECTED TO PCB AND SGND PIN)
TJMAX = 125°C, θJA = 34°C/W
ORDER PART
NUMBER
LTC3732CUHF
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = VRUN/SS = 5V unless otherwise noted.
SYMBOL
PARAMETER
Main Control Loop
VREGULATED Regulated Voltage at IN+
CONDITIONS
(Note 3); VID Code = 11111, VITH = 1.2V
VSENSEMAX
IMATCH
VLOADREG
VREFLNREG
Maximum Current Sense Threshold
Current Match
Output Voltage Load Regulation
Output Voltage Line Regulation
VEAIN = 0.5V, VITH Open,
VSENSE1, VSENSE2, VSENSE3– = 0.6V, 1.8V
Worst-Case Error at VSENSE MAX
(Note 3)
Measured in Servo Loop, ITH Voltage = 1.2V to 0.7V
Measured in Servo Loop, ITH Voltage = 1.2V to 2V
VCC = 4.5V to 7V
MIN
1.067
q 1.064
65
q 62
–5
q
q
TYP
1.075
1.075
75
75
0.1
– 0.1
0.03
MAX UNITS
1.083
1.086
85
88
5
V
V
mV
mV
%
0.5 %
–0.5 %
%/V
3732f
2


Part Number LTC3732
Description Synchronous Buck Switching Regulator Controller
Maker Linear Technology
Total Page 28 Pages
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