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Linear Technology Electronic Components Datasheet

LTC3787HUFD Datasheet

PolyPhase Synchronous Boost Controller

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LTC3787
PolyPhase Synchronous
Boost Controller
FEATURES
n 2-Phase Operation Reduces Required Input and
Output Capacitance and Power Supply Induced Noise
n Synchronous Operation for Highest Efficiency and
Reduced Heat Dissipation
n Wide VIN Range: 4.5V to 38V (40V Abs Max) and
Operates Down to 2.5V After Start-Up
n Output Voltage Up to 60V
n ±1% 1.200V Reference Voltage
n RSENSE or Inductor DCR Current Sensing
n 100% Duty Cycle Capability for Synchronous MOSFET
n Low Quiescent Current: 135μA
n Phase-Lockable Frequency (75kHz to 850kHz)
n Programmable Fixed Frequency (50kHz to 900kHz)
n Power Good Output Voltage Monitor
n Low Shutdown Current, IQ < 8μA
n Internal LDO Powers Gate Drive from VBIAS or EXTVCC
n Thermally Enhanced Low Profile 28-Pin 4mm × 5mm
QFN Package and Narrow SSOP Package
APPLICATIONS
n Industrial
n Automotive
n Medical
n Military
DESCRIPTION
The LTC®3787 is a high performance PolyPhase® single
output synchronous boost converter controller that drives
two N-channel power MOSFET stages out-of-phase.
Multiphase operation reduces input and output capacitor
requirements and allows the use of smaller inductors than
the single-phase equivalent. Synchronous rectification in-
creases efficiency, reduces power losses and eases thermal
requirements, enabling high power boost applications.
A 4.5V to 38V input supply range encompasses a wide
range of system architectures and battery chemistries.
When biased from the output of the boost converter or
another auxiliary supply, the LTC3787 can operate from
an input supply as low as 2.5V after start-up. The operat-
ing frequency can be set for a 50kHz to 900kHz range or
synchronized to an external clock using the internal PLL.
PolyPhase operation allows the LTC3787 to be configured
for 2-, 3-, 4-, 6- and 12-phase operation.
The SS pin ramps the output voltage during start-up. The
PLLIN/MODE pin selects Burst Mode® operation, pulse-
skipping mode or forced continuous mode at light loads.
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase
are registered trademarks and No RSENSE and ThinSOT are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners. Protected by
U. S. Patents, including 5408150, 5481178, 5705919, 5929620, 6144194, 6177787, 6580258.
TYPICAL APPLICATION
12V to 24V/10A 2-Phase Synchronous Boost Converter
VIN 4.5V TO 24V START-UP VOLTAGE
OPERATES THROUGH TRANSIENTS DOWN TO 2.5V
VIN
4mΩ
4.7μF
4.7μF
TG1 VBIAS INTVCC TG2
3.3μH
BOOST1
0.1μF
SW1
BOOST2
0.1μF
SW2
BG1 LTC3787
SENSE1+
BG2
232k
SENSE1
SENSE2+
VFB
FREQ
SENSE2
PLLIN/MODE
PGND
12.1k
15nF
8.66k
ITH SS SGND
100pF
0.1μF
4mΩ
47μF
3.3μH
VOUT
24V AT 10A
220μF
3787 TA01a
Efficiency and Power Loss
vs Output Current
100
10000
90
80
1000
70
60
100
50
40
10
30
20
10
0
0.00001 0.0001 0.001
VIN = 12V
1
VOUT = 24V
Burst Mode OPERATION
FIGURE 10 CIRCUIT
0.1
0.01 0.1 1 10
OUTPUT CURRENT (A)
3787 TA01b
BURST EFFICIENCY
BURST LOSS
3787fc
1


Linear Technology Electronic Components Datasheet

LTC3787HUFD Datasheet

PolyPhase Synchronous Boost Controller

No Preview Available !

LTC3787
ABSOLUTE MAXIMUM RATINGS (Notes 1, 3)
VBIAS ........................................................ –0.3V to 40V
BOOST1 and BOOST2 ................................ –0.3V to 76V
SW1 and SW2............................................ –0.3V to 70V
RUN ............................................................. –0.3V to 8V
Maximum Current Sourced into Pin
From Source >8V..............................................100μA
PGOOD, PLLIN/MODE ................................. –0.3V to 6V
INTVCC, (BOOST1 - SW1), (BOOST2 - SW2)...–0.3V to 6V
EXTVCC ........................................................ –0.3V to 6V
SENSE1+, SENSE1, SENSE2+, SENSE2... –0.3V to 40V
(SENSE1+ - SENSE1), (SENSE2+- SENSE2)...–0.3V to 0.3V
ILIM, SS, ITH, FREQ, PHASMD, VFB..... –0.3V to INTVCC
Operating Junction Temperature
Range (Note 2)........................................–55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
ILIM 1
SENSE1+ 2
SENSE13
FREQ 4
PHASMD 5
CLKOUT 6
PLLIN/MODE 7
SGND 8
RUN 9
SS 10
SENSE211
SENSE2+ 12
VFB 13
ITH 14
28 PGOOD
27 SW1
26 TG1
25 BOOST1
24 BG1
23 VBIAS
22 PGND
21 EXTVCC
20 INTVCC
19 BG2
18 BOOST2
17 TG2
16 SW2
15 NC
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 125°C, θJA = 90°C/W
TOP VIEW
28 27 26 25 24 23
FREQ 1
22 BOOST1
PHASMD 2
21 BG1
CLKOUT 3
20 VBIAS
PLLIN/MODE 4
SGND 5
RUN 6
SS 7
SENSE28
9
29
19 PGND
GND
18 EXTVCC
17 INTVCC
16 BG2
15 BOOST2
10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE CONNECTED TO GND
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3787EUFD#PBF
LTC3787EUFD#TRPBF 3787
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3787IUFD#PBF
LTC3787IUFD#TRPBF 3787
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3787HUFD#PBF
LTC3787HUFD#TRPBF 3787
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 150°C
LTC3787MPUFD#PBF
LTC3787MPUFD#TRPBF 3787
28-Lead (4mm × 5mm) Plastic QFN
–55°C to 150°C
LTC3787EGN#PBF
LTC3787EGN#TRPBF LTC3787GN
28-Lead Plastic SSOP
–40°C to 125°C
LTC3787IGN#PBF
LTC3787IGN#TRPBF
LTC3787GN
28-Lead Plastic SSOP
–40°C to 125°C
LTC3787HGN#PBF
LTC3787HGN#TRPBF LTC3787GN
28-Lead Plastic SSOP
–40°C to 150°C
LTC3787MPGN#PBF
LTC3787MPGN#TRPBF LTC3787GN
28-Lead Plastic SSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3787fc
2


Part Number LTC3787HUFD
Description PolyPhase Synchronous Boost Controller
Maker Linear
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