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LTC3787HGN#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36
LTC3787
1
3787fc
n
Industrial
n
Automotive
n
Medical
n
Military
TYPICAL APPLICATION
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 V
IN
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
R
SENSE
or Inductor DCR Current Sensing
n
100% Duty Cycle Capability for Synchronous MOSFET
n
Low Quiescent Current: 135A
n
Phase-Lockable Frequency (75kHz to 850kHz)
n
Programmable Fixed Frequency (50kHz to 900kHz)
n
Power Good Output Voltage Monitor
n
Low Shutdown Current, I
Q
< 8µA
n
Internal LDO Powers Gate Drive from VBIAS or EXTV
CC
n
Thermally Enhanced Low Profile 28-Pin 4mm × 5mm
QFN Package and Narrow SSOP Package
FEATURES DESCRIPTION
PolyPhase Synchronous
Boost Controller
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.
APPLICATIONS
L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, OPTI-LOOP and PolyPhase
are registered trademarks and No R
SENSE
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.
15nF
4.7µF
8.66k
12.1k
V
OUT
24V AT 10A
V
IN
V
IN
4.5V TO 24V START-UP VOLTAGE
OPERATES THROUGH TRANSIENTS DOWN TO 2.5V
0.1µF
100pF
220µF
TG1
BOOST1
SW1
BG1
FREQ
SS SGND
SENSE1
+
SENSE1
–
VFB
ITH
VBIAS
LTC3787
INTV
CC
PLLIN/MODE
TG2
BOOST2
SW2
BG2
SENSE2
+
SENSE2
–
PGND
0.1µF
0.1µF
4.7µF
232k
3787 TA01a
47µF
3.3µH
3.3µH
4m 4m
12V to 24V/10A 2-Phase Synchronous Boost Converter
OUTPUT CURRENT (A)
40
EFFICIENCY (%)
POWER LOSS (mW)
50
60
70
80
3787 TA01b
30
20
10
0
90
100
10
100
1000
1
0.1
10000
0.01 0.1 1 10
BURST EFFICIENCY
BURST LOSS
V
IN
= 12V
V
OUT
= 24V
Burst Mode OPERATION
FIGURE 10 CIRCUIT
0.0001 0.0010.00001
Efficiency and Power Loss
vs Output Current
LTC3787
2
3787fc
ABSOLUTE MAXIMUM RATINGS
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
INTV
CC
, (BOOST1 - SW1), (BOOST2 - SW2) ...–0.3V to 6V
(Notes 1, 3)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
GN PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ILIM
SENSE1
+
SENSE1
–
FREQ
PHASMD
CLKOUT
PLLIN/MODE
SGND
RUN
SS
SENSE2
–
SENSE2
+
VFB
ITH
PGOOD
SW1
TG1
BOOST1
BG1
VBIAS
PGND
EXTV
CC
INTV
CC
BG2
BOOST2
TG2
SW2
NC
T
JMAX
= 125°C, θ
JA
= 90°C/W
9 10
TOP VIEW
29
GND
UFD PACKAGE
28-LEAD (4mm s 5mm) PLASTIC QFN
11 12 13
28 27 26 25 24
14
23
6
5
4
3
2
1
FREQ
PHASMD
CLKOUT
PLLIN/MODE
SGND
RUN
SS
SENSE2
–
BOOST1
BG1
VBIAS
PGND
EXTV
CC
INTV
CC
BG2
BOOST2
SENSE1
–
SENSE1
+
ILIM
PGOOD
SW1
TG1
SENSE2
+
VFB
ITH
NC
SW2
TG2
7
17
18
19
20
21
22
16
8
15
T
JMAX
= 125°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 29) IS GND, MUST BE CONNECTED TO GND
PIN CONFIGURATION
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/
EXTV
CC
........................................................ –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 INTV
CC
Operating Junction Temperature
Range (Note 2) ........................................–55°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
LTC3787
3
3787fc
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
= 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Main Control Loop
VBIAS Chip Bias Voltage Operating Range 4.5 38 V
V
FB
Regulated Feedback Voltage I
TH
= 1.2V (Note 4)
l
1.188 1.200 1.212 V
I
FB
Feedback Current (Note 4) ±5 ±50 nA
V
REFLNREG
Reference Line Voltage Regulation VBIAS = 6V to 38V 0.002 0.02 %/V
V
LOADREG
Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop;
∆I
TH
Voltage = 1.2V to 0.7V
l
0.01 0.1 %
Measured in Servo Loop;
∆I
TH
Voltage = 1.2V to 2V
l
–0.01 –0.1 %
g
m
Error Amplifier Transconductance I
TH
= 1.2V 2 mmho
I
Q
Input DC Supply Current
Pulse-Skipping or Forced Continuous Mode
Sleep Mode
Shutdown
(Note 5)
RUN = 5V; V
FB
= 1.25V (No Load)
RUN = 5V; V
FB
= 1.25V (No Load)
RUN = 0V
1.2
135
8
300
20
mA
µA
µA
UVLO INTV
CC
Undervoltage Lockout Thresholds V
INTVCC
Ramping Up
V
INTVCC
Ramping Down
l
l
3.6
4.1
3.8
4.3 V
V
V
RUN
RUN Pin ON Threshold V
RUN
Rising
l
1.18 1.28 1.38 V
V
RUNHYS
RUN Pin Hysteresis 100 mV
I
RUNHYS
RUN Pin Hysteresis Current V
RUN
> 1.28V 4.5 µA
I
RUN
RUN Pin Current V
RUN
< 1.28V 0.5 µA
I
SS
Soft-Start Charge Current V
SS
= GND 7 10 13 µA
V
SENSE1,2(MAX)
Maximum Current Sense Threshold V
FB
= 1.1V, I
LIM
= INTV
CC
V
FB
= 1.1V, I
LIM
= Float
V
FB
= 1.1V, I
LIM
= GND
l
l
l
90
68
42
100
75
50
110
82
56
mV
mV
mV
V
SENSE(MATCH)
Matching Between V
SENSE1(MAX)
and
V
SENSE2(MAX)
V
FB
= 1.1V, I
LIM
= INTV
CC
V
FB
= 1.1V, I
LIM
= Float
V
FB
= 1.1V, I
LIM
= GND
l
l
l
–12
–10
–9
0
0
0
12
10
9
mV
mV
mV
V
SENSE(CM)
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage V
IN
)
2.5 38 V
I
SENSE1,2
+
SENSE
+
Pin Current V
FB
= 1.1V, I
LIM
= Float 200 300 µA
I
SENSE1,2
–
SENSE
–
Pin Current V
FB
= 1.1V, I
LIM
= Float ±1 µA
t
r(TG1,2)
Top Gate Rise Time C
LOAD
= 3300pF (Note 6) 20 ns
t
f(TG1,2)
Top Gate Fall Time C
LOAD
= 3300pF (Note 6) 20 ns
t
r(BG1,2)
Bottom Gate Rise Time C
LOAD
= 3300pF (Note 6) 20 ns
t
r(BG1,2)
Bottom Gate Fall Time C
LOAD
= 3300pF (Note 6) 20 ns
R
UP(TG1,2)
Top Gate Pull-Up Resistance 1.2
R
DN(TG1,2)
Top Gate Pull-Down Resistance 1.2
R
UP(TG1,2)
Bottom Gate Pull-Up Resistance 1.2
R
DN(TG1,2)
Bottom Gate Pull-Down Resistance 1.2
t
D(TG/BG)
Top Gate Off to Bottom Gate On Switch-On
Delay Time
C
LOAD
= 3300pF (Each Driver) 70 ns
t
D(BG/TG)
Bottom Gate Off to Top Gate On Switch-On
Delay Time
C
LOAD
= 3300pF (Each Driver) 70 ns
DF
BG1,2(MAX)
Maximum BG Duty Factor 96 %
t
ON(MIN)
Minimum BG On-Time (Note 7) 110 ns
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LTC3787HGN#TRPBF

Mfr. #:
Buy LTC3787HGN#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators PolyPhSync Boost Cntr
Lifecycle:
New from this manufacturer.
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