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Linear Technology Electronic Components Datasheet

LTC3784HGN Datasheet

Boost Controller

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LTC3784
Features
60V PolyPhase Synchronous
Boost Controller
Description
n PolyPhase® 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 60V (65V Abs Max);
Operates Down to 2.3V 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: 28μA
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 < 4µA
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
The LTC®3784 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, simplifying high power boost applications.
A 4.5V to 60V 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 LTC3784 can operate from an
input supply as low as 2.3V after start-up. The operating
frequency can be set within a 50kHz to 900kHz range or
synchronized to an external clock using the internal PLL.
PolyPhase operation allows the LTC3784 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
240W, 12V to 24V/10A 2-Phase Synchronous Boost Converter
4mΩ 3.3µH
47µF
VIN
4.5V TO 60V
DOWN TO 2.3V AFTER
STARTUP IF VBIAS IS
POWERED FROM VOUT
VBIAS
SENSE1+
SENSE1
BG1
BOOST1
SW1
LTC3784
TG1
INTVCC
0.1µF
4.7µF
SENSE2+
SENSE2
BG2
4mΩ 3.3µH
VOUT
24V AT 10A
220µF
VOUT
FOLLOWS VIN
FOR VIN > 24V
15nF
8.66k
BOOST2
FREQ
OVMODE
SW2
PLLIN/MODE
TG2
ITH
VFB
SS
SGND PGND
100pF
0.1µF
0.1µF
232k
12.1k
3784 TA01a
Efficiency and Power Loss
vs Output Current
100
10000
90
80
1000
70
60
100
50
40
10
BURST EFFICIENCY
30
BURST LOSS
20
VIN = 12V
VOUT = 24V
1
10
Burst Mode OPERATION
FIGURE 10 CIRCUIT
0
0.1
0.00001 0.0001 0.001 0.01 0.1 1 10
OUTPUT CURRENT (A)
3784 TA01b
For more information www.linear.com/LTC3784
3784fb
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Linear Technology Electronic Components Datasheet

LTC3784HGN Datasheet

Boost Controller

No Preview Available !

LTC3784
Absolute Maximum Ratings (Notes 1, 3)
VBIAS......................................................... –0.3V to 65V
BOOST1 and BOOST2..................................–0.3V to 71V
SW1 and SW2................................................ –5V to 65V
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 14V
SENSE1+, SENSE1, SENSE2+, SENSE2.... –0.3V to 65V
(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
Lead Temperature (Soldering, 10 sec) SSOP......... 300°C
Pin Configuration
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
TOP VIEW
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 OVMODE
GN PACKAGE
28-LEAD PLASTIC SSOP
TJMAX = 150°C, θJA = 80°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 × 5mm) PLASTIC QFN
TJMAX = 150°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
LTC3784EUFD#PBF
LTC3784EUFD#TRPBF 3784
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3784IUFD#PBF
LTC3784IUFD#TRPBF 3784
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3784HUFD#PBF
LTC3784HUFD#TRPBF 3784
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 150°C
LTC3784MPUFD#PBF
LTC3784MPUFD#TRPBF 3784
28-Lead (4mm × 5mm) Plastic QFN
–55°C to 150°C
LTC3784EGN#PBF
LTC3784EGN#TRPBF
LTC3784GN
28-Lead Plastic SSOP
–40°C to 125°C
LTC3784IGN#PBF
LTC3784IGN#TRPBF
LTC3784GN
28-Lead Plastic SSOP
–40°C to 125°C
LTC3784HGN#PBF
LTC3784HGN#TRPBF LTC3784GN
28-Lead Plastic SSOP
–40°C to 150°C
LTC3784MPGN#PBF
LTC3784MPGN#TRPBF LTC3784GN
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/
3784fb
2
For more information www.linear.com/LTC3784


Part Number LTC3784HGN
Description Boost Controller
Maker Linear
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