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Linear Technology Electronic Components Datasheet

LTC3789IGN Datasheet

4-Switch Buck-Boost Controller

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LTC3789
High Efficiency, Synchronous,
4-Switch Buck-Boost Controller
Features
Description
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
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
TG1 LTC3789 TG2
BOOST1
BOOST2
SW1
SW2
1000pF
2200pF
8k
0.01µF
BG1
ITH
SS
SGND
BG2
MODE/PLLIN
RUN
VFB
FREQ
SENSE+ SENSEPGND
1µF
CER
2.2µF
D
0.1µF
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
2
VOUT = 12V
ILOAD = 5A
0
5 10 15 20 25 30 35 40
VIN (V)
3789 TA01b
3789fc
1


Linear Technology Electronic Components Datasheet

LTC3789IGN Datasheet

4-Switch Buck-Boost Controller

No Preview Available !

LTC3789
Absolute Maximum Ratings (Note 1)
Input Supply Voltage (VIN).......................... 40V to –0.3V
Topside Driver Voltages
(BOOST1, BOOST2)................................... 46V to –0.3V
Switch Voltage (SW1, SW2)........................... 40V to –5V
Current Sense Voltages (IOSENSE+, IOSENSE–).. 40V to –0.3V
BOOST1, BOOST2 – SW1, SW2.................... 6V to –0.3V
TG1, TG2 – SW1, SW2.................................. 6V to –0.3V
EXTVCC Voltage.......................................... 14V to –0.3V
INTVCC Voltage............................................. 6V to –0.3V
SENSE+, SENSEVoltages..................... INTVCC to –0.3V
MODE/PLLIN, SS Voltages ................... INTVCC to –0.3V
VINSNS, VOUTSNS......................................... 40V to –0.3V
TG1, TG2, BG1, BG2 Voltages ............................ (Note 6)
ITH, FREQ, ILIM Voltages........................ INTVCC to –0.3V
VFB Voltage................................................ 2.7V to –0.3V
RUN, PGOOD Voltage ................................... 6V to –0.3V
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
INTVCC Peak Output Current.................................100mA
Lead Temperature (Soldering, 10 sec.)
GN Package....................................................... 300°C
Pin Configuration
TOP VIEW
VFB 1
SS 2
SENSE+ 3
SENSE4
ITH 5
SGND 6
MODE/PLLIN 7
FREQ 8
RUN 9
VINSNS 10
VOUTSNS 11
ILIM 12
IOSENSE+ 13
IOSENSE– 14
28 PGOOD
27 SW1
26 TG1
25 BOOST1
24 PGND
23 BG1
22 VIN
21 INTVCC
20 EXTVCC
19 BG2
18 BOOST2
17 TG2
16 SW2
15 TRIM
GN PACKAGE
28-LEAD NARROW PLASTIC SSOP
TJMAX = 125°C, θJA = 80°C/W
TOP VIEW
28 27 26 25 24 23
SENSE1
22 BOOST1
ITH 2
21 PGND
SGND 3
20 BG1
MODE/PLLIN 4
FREQ 5
RUN 6
VINSNS 7
29
SGND
19 VIN
18 INTVCC
17 EXTVCC
16 BG2
VOUTSNS 8
15 BOOST2
9 10 11 12 13 14
UFD PACKAGE
28-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 34°C/W
EXPOSED PAD (PIN 29) IS SGND, MUST BE SOLDERED TO PCB
order information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3789EGN#PBF
LTC3789EGN#TRPBF LTC3789
28-Lead Narrow Plastic SSOP
–40°C to 125°C
LTC3789IGN#PBF
LTC3789IGN#TRPBF
LTC3789
28-Lead Narrow Plastic SSOP
–40°C to 125°C
LTC3789EUFD#PBF
LTC3789EUFD#TRPBF 3789
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°C
LTC3789IUFD#PBF
LTC3789IUFD#TRPBF 3789
28-Lead (4mm × 5mm) Plastic QFN
–40°C to 125°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/
3789fc
2
For more information www.linear.com/LTC3789


Part Number LTC3789IGN
Description 4-Switch Buck-Boost Controller
Maker Linear
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