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PDF LTC3789 Data sheet ( Hoja de datos )

Número de pieza LTC3789
Descripción 4-Switch Buck-Boost Controller
Fabricantes Linear 
Logotipo Linear Logotipo



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No Preview Available ! LTC3789 Hoja de datos, Descripción, Manual

LTC3789
Features
n Single Inductor Architecture Allows VIN Above,
Below or Equal to the Regulated VOUT
n Programmable Input or Output Current
n Wide VIN Range: 4V to 38V
n 1% Output Voltage Accuracy: 0.8V < VOUT < 38V
n Synchronous Rectification: Up to 98% Efficiency
n Current Mode Control
n Phase-Lockable Fixed Frequency: 200kHz to 600kHz
n No Reverse Current During Start-Up
n Power Good Output Voltage Monitor
n Internal 5.5V LDO
n Quad N-Channel MOSFET Synchronous Drive
n VOUT Disconnected from VIN During Shutdown
n True Soft-Start and VOUT Short Protection, Even in
Boost Mode
n Available in 28-Lead QFN (4mm × 5mm) and
28-Lead SSOP Packages
Applications
n Automotive Systems
n Distributed DC Power Systems
n High Power Battery-Operated Devices
n Industrial Control
High Efficiency, Synchronous,
4-Switch Buck-Boost Controller
Description
The LTC®3789 is a high performance buck-boost switch-
ing regulator controller that operates from input volt-
ages above, below or equal to the output voltage. The
constant-frequency, current mode architecture allows
a phase-lockable frequency of up to 600kHz, while an
output current feedback loop provides support for battery
charging. With a wide 4V to 38V (40V maximum) input and
output range and seamless, low noise transitions between
operating regions, the LTC3789 is ideal for automotive,
telecom and battery-powered systems.
The operating mode of the controller is determined through
the MODE/PLLIN pin. The MODE/PLLIN pin can select
between pulse-skipping mode and forced continuous
mode operation and allows the IC to be synchronized to an
external clock. Pulse-skipping mode offers high efficiency
and low ripple at light loads, while forced continuous
mode operates at a constant frequency for noise-sensitive
applications.
A PGOOD pin indicates when the output is within 10% of
its designed set point. The LTC3789 is available in low pro-
file 28-pin 4mm × 5mm QFN and narrow SSOP packages.
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents, including 5408150,
5481178, 5929620, 6580258, 7365525, 7394231.
Typical Application
VIN
4V TO
38V
22µF
50V
CER
A
B
+
4.7µF
ILIM INTVCC IOSENSE–
PGOOD
VIN
VINSNS
IOSENSE+
EXTVCC
VOUTSNS
0.1µF
2200pF
8k
1000pF
0.01µF
TG1 LTC3789 TG2
BOOST1
BOOST2
SW1 SW2
BG1 BG2
ITH MODE/PLLIN
SS RUN
SGND
VFB
FREQ
SENSE+ SENSEPGND
1µF
CER
2.2µF
0.1µF
D
C
ON/OFF 105k, 1%
7.5k
121k 1%
100Ω
100Ω
0.010Ω
10µF +
16V
CER
VOUT
12V
5A
330µF
16V
4.7µH
0.010Ω
3789 TA01
For more information www.linear.com/LTC3789
Efficiency and Power Loss
100 12
95 10
90 8
85 6
80 4
75
70
0
VOUT = 12V 2
ILOAD = 5A
0
5 10 15 20 25 30 35 40
VIN (V)
3789 TA01b
3789fc
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LTC3789 pdf
LTC3789
Typical Performance Characteristics TA = 25°C unless otherwise noted.
Efficiency vs Output Current
(Boost Region)
100
90
VIN = 6V
VOUT = 12V
80
70
60
50
40
30
20
10
0 CIRCUIT OF FIGURE 13
10 100
1000
LOAD CURRENT (mA)
DCM
FCM
10000
3789 G01
Efficiency vs Output Current
(Buck-Boost Region)
100
90
VIN = 12V
VOUT = 12V
80
70
60
50
40
30
20
10 CIRCUIT OF FIGURE 13
0
10 100
1000
LOAD CURRENT (mA)
DCM
FCM
10000
3789 G02
Efficiency vs Output Current
(Buck Region)
100
90
VIN = 18V
VOUT = 12V
80
70
60
50
40
30
20
10
CIRCUIT OF FIGURE 13
0
10 100
1000
LOAD CURRENT (mA)
DCM
FCM
10000
3789 G03
Efficiency vs VIN
99 CIRCUIT OF FIGURE 13
98
97
96
95
94
93
92
91
0
FREQUENCY
200kHz
300kHz
400kHz
520kHz
10 20
VIN (V)
30 40
3789 G04
IVNoTltVaCgCeavnsdTEeXmTpVeCrCaStuwreitch
6
5 RISING
FALLING
4
3
2
1
0
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3789 G07
Internal 5.5V LDO Line
Regulation
6.0
5.5
5.0
4.5
4.0
3.5
4 9 14 19 24 29 34
INPUT VOLTAGE (V)
3789 G05
Supply Current vs Input Voltage
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4 9 14 19 24 29 34
INPUT VOLTAGE (V)
3789 G08
For more information www.linear.com/LTC3789
EXTVCC LDO Line Regulation
6
5
4
3
2
1
0
4 5 6 7 8 9 10 11 12 13 14
EXTVCC (V)
3789 G06
RUN Pin Threshold
vs Temperature
1.5
1.4
1.3 RISING
1.2
1.1 FALLING
1.0
0.9
0.8
0.7
0.6
0.5
–60 –40 –20 0 20 40 60
TEMPERATURE (°C)
80 100
3789 G09
3789fc
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LTC3789 arduino
Block Diagram
CHARGE
PUMP
BOOST1
CHARGE
PUMP
BOOST2
VFLD
1.2µA
RUN
SHDN
MODE/
FIN
PLLIN
PHASE DET
220k
FREQ
10µA
OSCILLATOR
VIN VIN
4.8V +
EXTVCC
+5.5V
INTVCC
SGND
LTC3789
VIN + IDREV
SW1
+ IREV
+ ICMP
SLOPE
INTVCC VIN
BOOST1
FCB TG1
BUCK
LOGIC
SW1
INTVCC
BG1
PGND
BG2
FCB
BOOST
LOGIC
INTVCC SW2
TG2
BOOST2
OV
IOS
EA
3µA
+ IOSENSE+
IOSENSE–
ILIM
++–
VFB
0.80V SS
INTVCC
RSENSE
RSENSE2
+ VOUT
EXTVCC
5.5V 5.5V
LDO LDO
REG REG
0.86V
+
VFB
INTERNAL
SUPPLY
0.74V +
ITH
SENSE+
SENSE
OV
PGOOD
3789 BD
For more information www.linear.com/LTC3789
3789fc
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