Configurable 7-Channel High Power PMIC

Configurable 7-Channel High Power PMIC
2.7V to 5.5V
3
5
Pushbutton
I2C
VIN
EN
SW1-4
4
4 Buck Converters (500mA ×2, 1A ×2)
VOUT5
Boost Converter (Up to 1A)
VOUT6
Buck-Boost Converter (Up to 1A)
25mA LDO
LDO
ONB
SW7
4mm
Up to 10 LEDs
40V LED Driver
LTC3675
7mm
•
•
•
•
•
•
LED1
LED2
GND
QFN-44
4 Parallelable Bucks + Buck-Boost + Boost + LDO + LED Driver
+ I2C Control + Pushbutton Control = Complete, High Power and
Flexible Power Management Solution
The LTC®3675 is a highly integrated general-purpose power management solution for high power single cell Lithium-Ion/Polymer
systems. The device features seven independent rails plus LED driver, with I2C control, flexible sequencing and fault monitoring in a
compact 28mm2 QFN package. The device’s seven channels include four high current, high efficiency step-down regulators, a high
current/high efficiency buck-boost regulator, a high current/high efficiency boost regulator and one always-on 25mA LDO.
Features
Four Monolithic Synchronous Buck DC/DCs
(1A/1A/500mA/500mA)
Adjacent Buck DC/DCs Can Be Paralleled to Deliver Up
to 2× Current with a Single Inductor
Independent 1A Buck-Boost and 1A Boost DC/DCs
Dual String I2C-Controlled LED Driver
Always-On 25mA LDO
I2C Programmable Output Voltage, Operating Mode and
Switch Node Slew Rate for All DC/DCs
I2C Read Back of DC/DC, LED Driver, Fault Status
I2C Programmable VIN and Die Temperature Warnings
Maskable Interrupts to Report DC/DC Errors,
Input Undervoltage and Die Temperature Warnings
Pushbutton ON/OFF/RESET
Low Quiescent Current: 16µA (All DC/DCs Off)
Thermally Enhanced, 4mm × 7mm × 0.75mm
44-Lead QFN Package
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LTC3675 Demo Board
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25mm
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Applications
25mm
High Power (5W to 10W) Single Cell
Li-Ion/Polymer Applications
Portable Industrial Applications,
Handy Terminals, Portable Instruments
Multioutput Low Voltage Power Supplies
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L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are
registered trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
VIN
4 Configurable
Sync Buck
Regulators
VIN
Adjacent Bucks Can
Be Paralleled to
Deliver Up to 2×
Current with a
Single Inductor.
VOUT5
6
5
2
1
FB5
VIN
1A BUCK-BOOST REGULATOR
SW1
FB1
SW5
1A BOOST REGULATOR
LTC3675
VIN
VOUT6
BUCK REGULATOR 1
1A
8
3
4
SWAB6
MODULATION
CONTROL
SWCD6
FB6
FB2
BUCK REGULATOR 2
1A
ENBB
VIN
REF, CLK
EN2
LED1
LED2
BANDGAP,
OSCILLATOR,
UV, OT
MODULATION
CONTROL
SW7
12
I2C Control
Programmable
DC/DC Enables,
Output Voltages,
Switch Slew Rates,
Operating Modes,
Alarm Levels for Low
VIN and High Die
Temperature, Plus
LED Driver’s LED
Enable, 60dB
Brightness Control
and Up/Down
Gradation.
10
SW3
FB3
LED DRIVER
BUCK REGULATOR 3
500mA
VIN
EN3
VIN
LED_OV
–
+
LDO
14
13
40
42
38
44
LDO_OUT
MASTER/SLAVE LINES
LDOFB
DVCC
SW4
FB4
EN4
TOP LOGIC,
CT OSCILLATOR,
TIMING
BUCK REGULATOR 4
500mA
36
37
17
21
27
16
31
1A Sync
Boost Regulator
For High Efficiency
5V I/O Rails.
1A Sync BuckBoost Regulator
Typically For High
Efficiency 3.3V Rails.
40V Dual String
LED Driver
Can Regulate Up to
25mA of Current
Through Two LED
Strings with Up to
10 LEDs Each.
Also Configurable
as a High Voltage
Boost Converter
Up to 40V Output.
VIN
DAC BITS, SLEW CONTROL,
GRADATION, STATUS BITS
11
35
18,19, 20
LED_FS
15
32
VIN
SW2
MASTER/SLAVE LINES
9
33
EN1
MASTER/SLAVE LINES
7
34
SCL
I2C
SDA
RSTB
IRQB
PBSTAT
WAKE
CT
ONB
GND
30
29
Always-On LDO
For Keep-Alive or
RTC Rails.
41
39
43
23
24
25
26
22
28
Pushbutton Control
ON/OFF/RESET Control
and a Power-On Reset
Output Provide
Flexible and Reliable
Power-Up Sequencing.
45
Switching Regulator Slew Rate Control
Reduces Radiated EMI and Conducted Supply Noise While Maintaining High Efficiency.
High Voltage Boost Regulator,
Efficiency vs Load
100
100
90
90
80
80
70
70
60
50
VOUT3 = 1.8V
VIN = 2.7V Burst Mode® OPERATION
VIN = 3.6V Burst Mode OPERATION
VIN = 5.5V Burst Mode OPERATION
VIN = 2.7V PULSE SKIPPING-MODE
VIN = 3.6V PULSE SKIPPING-MODE
VIN = 5.5V PULSE SKIPPING-MODE
40
30
20
10
0
1
10
100
LOAD CURRENT (mA)
1000
EFFICIENCY (%)
EFFICIENCY (%)
500mA Buck Regulators,
Efficiency vs Load
VIN = 5.5V
VIN = 2.7V
60
VIN = 3.6V
50
40
30
20
MODE1 = 1, MODE0 = 0
VOUT = 12V
10
0
1
10
100
LOAD CURRENT (mA)
1000
www.linear.com/3675 n 1-800-4-LINEAR
1010
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