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LTC3769MPUF#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
LTC3769
1
3769fa
For more information www.linear.com/LTC3769
n
Industrial
n
Automotive
n
Medical
n
Military
TYPICAL APPLICATION
n
Synchronous Operation for Highest Efficiency and
Reduced Heat Dissipation
n
Wide V
IN
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
R
SENSE
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: 4µA
n
Internal LDO Powers Gate Drive from VBIAS or EXTV
CC
n
Thermally Enhanced Low Profile 24-Pin 4mm × 4mm
QFN Package and 20-Lead TSSOP Package
FEATURES DESCRIPTION
60V Low I
Q
Synchronous
Boost Controller
The LTC
®
3769 is a high performance single output syn-
chronous boost converter controller that drives an all
N-channel power MOSFET stage. Synchronous rectifica-
tion increases efficiency, reduces power losses and eases
thermal requirements, simplifying high power boost ap-
plications. The 28µA no-load quiescent current extends
operating run time in batter
y-powered systems.
A 4.5V to 60V input supply range encompasses a wide
range of system ar
chitectures and battery chemistries.
When biased from the output of the boost converter or
another auxiliary supply, the LTC3769 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.
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
120W, 12V to 24V/5A Synchronous Boost Converter
Efficiency and Power Loss
vs Output Current
L, LT, LTC, LTM, Burst Mode, OPTI-LOOP, Linear Technology and the Linear logo are registered
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, 6177787, 6498466, 6580258, 6611131.
3.3µH
3769 TA01a
BOOST
0.1µF
4.7µF
TG
SW
BG
GND
VBIAS
V
IN
4.5V TO 60V
V
OUT
24V/5A
V
OUT
FOLLOWS V
IN
FOR V
IN
> 24V
LTC3769
INTV
CC
EXTV
CC
VFB
SENSE
+
SENSE
–
SS
RUN
ITH
PLLIN/MODE
FREQ
OVMODE
ILIM
PGOOD
22µF 220µF
4mΩ
8.66K
10nF
15nF
100pF
DOWN TO 2.3V
AFTER START-UP IF
VBIAS IS POWERED
FROM V
OUT
232k
12.1k
OUTPUT CURRENT (A)
0.010.0010.0001
40
EFFICIENCY (%)
POWER LOSS (W)
50
60
70
80
0.1 1 10
3769 TA01b
90
100
0.01
0.1
1
0.001
10
EFFICIENCY
POWER
LOSS
LTC3769
2
3769fa
For more information www.linear.com/LTC3769
ABSOLUTE MAXIMUM RATINGS
VBIAS ........................................................ –0.3V to 65V
BOOST ........................................................–0.3V to 71V
SW ................................................................ –5V to 65V
RUN ............................................................. –0.3V to 8V
Maximum Current Sourced into Pin
From Source >8V
.............................................. 100µA
PGOOD, PLLIN/MODE ................................. –0.3V to 6V
INTV
CC
, (BOOST - SW) ..................................–0.3V to 6V
(Notes 1, 3)
FE PACKAGE
20-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
9
10
TOP VIEW
20
19
18
17
16
15
14
13
12
11
ILIM
INTV
CC
FREQ
GND
PLLIN/MODE
RUN
SS
SENSE
–
SENSE
+
VFB
PGOOD
VBIAS
EXTV
CC
INTV
CC
BG
BOOST
TG
SW
OVMODE
ITH
21
GND
T
JMAX
= 150°C, θ
JA
= 38°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
24 23 22 21 20 19
7 8 9
TOP VIEW
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
10 11 12
6
5
4
3
2
1
13
14
15
16
17
18
VBIAS
PGOOD
ILIM
NC
INTV
CC
NC
SW
OVMODE
ITH
VFB
SENSE
+
SENSE
–
GND
EXTV
CC
INTV
CC
BG
BOOST
TG
FREQ
GND
PLLIN/MODE
GND
RUN
SS
25
GND
T
JMAX
= 150°C, θ
JA
= 47°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3769EUF#PBF LTC3769EUF#TRPBF 3769
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3769IUF#PBF LTC3769IUF#TRPBF 3769
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3769HUF#PBF LTC3769HUF#TRPBF 3769
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 150°C
LTC3769MPUF#PBF LTC3769MPUF#TRPBF 3769
24-Lead (4mm × 4mm) Plastic QFN
–55°C to 150°C
LTC3769EFE#PBF LTC3769EFE#TRPBF LTC3769FE 20-Lead Plastic SSOP –40°C to 125°C
LTC3769IFE#PBF LTC3769IFE#TRPBF LTC3769FE 20-Lead Plastic SSOP –40°C to 125°C
LTC3769HFE#PBF LTC3769HFE#TRPBF LTC3769FE 20-Lead Plastic SSOP –40°C to 150°C
LTC3769MPFE#PBF LTC3769MPFE#TRPBF LTC3769FE 20-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 14V
SENSE
+
, SENSE
–
........................................ –0.3V to 65V
(SENSE
+
- SENSE
–
) ............................................–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
Lead Temperature (Soldering, 10 sec) SSOP ........300°C
LTC3769
3
3769fa
For more information www.linear.com/LTC3769
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 60 V
V
IN
SENSE Pins Common Mode Range (BOOST
Converter Input Supply Voltage)
2.3 60 V
V
OUT
Regulated Output Voltage Range V
IN
60V V
V
FB
Regulated Feedback Voltage I
TH
= 1.2V (Note 4)
l
1.188 1.200 1.212 V
Feedback Current (Note 4) ±5 ±50 nA
Reference Line Voltage Regulation VBIAS = 6V to 60V 0.002 0.02 %/V
Output Voltage Load Regulation
(Note 4)
Measured in Servo Loop;
ΔI
TH
Voltage = 1.2V to 0.7V
l
0.01 0.1 %
Measured in Servo Loop;
ΔI
TH
Voltage = 1.2V to 2V
l
–0.01 –0.1 %
Error Amplifier Transconductance I
TH
= 1.2V 2 mmho
I
Q
Input DC Supply Current (VBIAS Pin)
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
0.9
28
4
45
10
mA
µA
µA
SW Pin Current V
SW
= 12V; V
BOOST
= 16.5V;
FREQ = 0V, Forced Continuous or
Pulse-Skipping Mode
700 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
RUN Pin Hysteresis 100 mV
RUN Pin Hysteresis Current V
RUN
> 1.28V 4.5 µA
RUN Pin Current V
RUN
< 1.28V 0.5 µA
Soft-Start Charge Current V
SS
= GND 7 10 13 µA
V
SENSE(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
SENSE
+
Pin Current V
FB
= 1.1V, I
LIM
= Float 200 300 µA
SENSE
–
Pin Current V
FB
= 1.1V, I
LIM
= Float ±1 µA
Top Gate Rise Time C
LOAD
= 3300pF (Note 6) 20 ns
Top Gate Fall Time C
LOAD
= 3300pF (Note 6) 20 ns
Bottom Gate Rise Time C
LOAD
= 3300pF (Note 6) 20 ns
Bottom Gate Fall Time C
LOAD
= 3300pF (Note 6) 20 ns
Top Gate Pull-Up Resistance 1.2 Ω
Top Gate Pull-Down Resistance 1.2 Ω
Bottom Gate Pull-Up Resistance 1.2 Ω
Bottom Gate Pull-Down Resistance 1.2 Ω
Top Gate Off to Bottom Gate On Switch-On
Delay Time
C
LOAD
= 3300pF (Each Driver) 30 ns
Bottom Gate Off to Top Gate On Switch-On
Delay Time
C
LOAD
= 3300pF (Each Driver) 30 ns
Maximum BG Duty Factor 96 %
t
ON(MIN)
Minimum BG On-Time (Note 7) 110 ns
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LTC3769MPUF#TRPBF

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Buy LTC3769MPUF#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 60V L IQ Sync Boost Cntr
Lifecycle:
New from this manufacturer.
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