LTM4605,LTM4607,LTM4609

Part No.:
LTM4605,LTM4607,LTM4609
Download:
Download
Description:
High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
File Size:
485 K
Page:
28 Pages
Logo:
Maker:
LINER [ LINEAR TECHNOLOGY ]
PCB Prototype

July 16, 2018:

LTM4627

LXMG1813-12-62S

M1540P-R10851-HD

M27C202-150N1TR

M27C202-70B3TR

M27C4002-20XN1X

M27C405-90K6TR

M27V402-180K4TR

M295V100-B90XM6R

M295V100-T90XM1TR

M29F400BT90N6T

M381L3223ETM-CB3

PCB Datasheet:1PCB Datasheet:1PCB Datasheet:1PCB Datasheet:1
LTC3789
High Efficiency, Synchronous,
4-Switch Buck-Boost Controller
FeaTures
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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 charg-
ing. 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 the lowest
ripple at light loads, while forced continuous mode operates
at a constant frequency for noise-sensitive applications.
A power good output pin indicates when the output is
within 10% of its designed set point. The LTC3789 is avail-
able in low profile 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.
Single Inductor Architecture Allows V
IN
Above,
Below or Equal to Regulated V
OUT
Programmable Input or Output Current Feedback Loop
Wide V
IN
Range: 4V to 38V
1% Output Voltage Accuracy: 0.8V < V
OUT
< 38V
Synchronous Rectification: Up to 98% Efficiency
Current Mode Control
Phase-Lockable Fixed Frequency: 200kHz to 600kHz
No Reverse Current During Start-Up
Power Good Output Voltage Monitor
Internal 5.5V LDO
Quad N-Channel MOSFET Synchronous Drive
V
OUT
Disconnected from V
IN
During Shutdown
Adjustable Soft-Start Output Ramping
Available in 28-Lead QFN (4mm × 5mm) and
28-Lead SSOP Packages
applicaTions
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Automotive Systems
Distributed DC Power Systems
High Power Battery-Operated Devices
Industrial Control
Typical applicaTion
+
4.7µF
I
LIM
V
IN
4V TO
38V
PGOOD
22µF
50V
CER A
V
IN
V
INSNS
0.1µF
TG1
INTV
CC
I
OSENSE
1µF
CER
I
OSENSE+
EXTV
CC
V
OUTSNS
0.1µF
D
10µF
16V
CER
V
OUT
12V
5A
330µF
16V
EFFICIENCY (%)
100
95
90
85
80
75
70
Efficiency and Power Loss
0.010
12
10
8
6
4
2
0
POWER LOSS (W)
+
TG2
LTC3789
BOOST1
BOOST2
SW1
SW2
BG2
MODE/PLLIN
RUN
V
FB
FREQ
121k
ON/OFF
BG1
B
2200pF
1000pF
8k
0.01µF
C
105k
1%
7.5k
1%
I
TH
SS
SGND
V
OUT
= 12V
I
LOAD
= 5A
0
5
10
15
20
VIN (V)
25
30
35
40
SENSE
+
SENSE
PGND
3789 TA01b
0.010
4.7µH
3789 TA01
3789f
1