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PDF LTC3675 Data sheet ( Hoja de datos )
| Número de pieza | LTC3675 | |
| Descripción | 7-Channel Configurable High Power PMIC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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DataSheet.in
FEATURES
n Four Monolithic Synchronous Buck DC/DCs
(1A/1A/500mA/500mA)
n Buck DC/DCs Can Be Paralleled to Deliver Up to
2× Current with a Single Inductor
n Independent 1A Boost and 1A Buck-Boost DC/DCs
n Dual String I2C Controlled 40V LED Driver
n I2C Programmable Output Voltage, Operating
Mode, and Switch Node Slew Rate for All DC/DCs
n I2C Read Back of DC/DC, LED Driver, Fault Status
n I2C Programmable VIN and Die Temperature
Warnings
n Maskable Interrupts to Report DC/DC, VIN and Die
Temperature Faults
n Pushbutton ON/OFF/RESET
n Always-On 25mA LDO
n Low Quiescent Current: 16μA (All DC/DCs Off)
n 4mm × 7mm × 0.75mm 44-Lead QFN Package
APPLICATIONS
n High Power (5W to 10W) Single Cell Li-Ion/Polymer
Applications
n Portable Industrial Applications, Handy Terminals,
Portable Instruments
n Multioutput Low Voltage Power Supplies
LTC3675
7-Channel Configurable
High Power PMIC
DESCRIPTION
The LTC®3675 is a digitally programmable high efficiency
multioutput power supply plus dual string LED driver IC
optimized for high power single cell Li-Ion/Polymer applica-
tions. The DC/DCs consist of four synchronous buck con-
verters (1A/1A/500mA/500mA), one synchronous boost
DC/DC (1A), and one buck-boost DC/DC (1A) all powered
from a 2.7V to 5.5V input. The 40V LED driver can regulate
up to 25mA of current through two LED strings with up to
10 LEDs each. The LED driver may also be configured as
a general purpose high voltage boost converter.
DC/DC enables, output voltages, switch slew rates and
operating modes may all be independently programmed
over I2C or used in standalone mode via simple I/O and
power-up defaults. The buck DC/DCs may be used inde-
pendently or paralleled to achieve higher output currents
with a shared inductor. LED enable, 60dB brightness control
and up/down gradation are programmed using I2C. Alarm
levels for low VIN and high die temperature may also be
programmed via I2C with a maskable interrupt output to
monitor DC/DC and system faults.
Pushbutton ON/OFF/RESET control and a power-on reset
output provide flexible and reliable power-up sequencing.
The LTC3675 is available in a low profile (0.75mm), ther-
mally enhanced 44-lead 4mm × 7mm QFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of
Linear Technology Corporation and Hot Swap is a trademark of Linear Technology Corporation. All
other trademarks are the property of their respective owners.
TYPICAL APPLICATION
2.7V TO 5.5V
3
DIGITAL
CONTROL
PUSH BUTTON
SW1
VIN SW2
SW3
I2C
EN1
LTC3675
SW4
SW5
EN2 VOUT5
EN3 SWAB6
EN4 SWCD6
ENBB
VOUT6
IRQB
LDO_OUT
RSTB
WAKE
PBSTAT
SW7
ONB
CT
0.01μF
LED1
EXPOSED PAD LED2
3675 TA01
0.425V TO VIN, 1A MAX
0.425V TO VIN, 1A MAX
0.425V TO VIN, 500mA MAX
0.425V TO VIN, 500mA MAX
VIN
VIN TO 5.35V, 1A MAX
2.65V TO 5.25V, 1A MAX
0.8V TO VIN, 25mA MAX
VIN
••• •••
UP TO 10 LEDS
PER STRING
3675f
1
1 page  
DataSheet.in
LTC3675
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VFB3,4(HIGH) Feedback Regulation Voltage
VFB3,4(LOW) Feedback Regulation Voltage
VLSB3,4
FB3, FB4 Regulation Voltage Step Size
IFB3,4
Feedback Leakage Current
DMAX3,4
Maximum Duty Cycle
RPMOS3,4
PMOS On-Resistance
RNMOS3,4
NMOS On-Resistance
ILEAKP3,4
PMOS Leakage Current
ILEAKN3,4
NMOS Leakage Current
RSWPD3,4
Output Pull-Down Resistance in Shutdown
tSS3,4
Soft-Start Time
Buck Regulators Combined
Pulse-Skipping Mode Full-Scale (1,1,1,1)
Pulse-Skipping Mode Full-Scale (0,0,0,0)
VFB3 = VFB4 = 0.85V
VFB3 = VFB4 = 0V
ISW3 = ISW4 = 100mA
ISW3 = ISW4 = –100mA
EN3 = EN4 = 0
EN3 = EN4 = 0
EN3 = EN4 = 0 (I2C Bit Set)
l
l
l
780
405
–50
100
–1
–1
800 820
425 445
25
50
500
510
1
1
10
500
mV
mV
mV
nA
%
mΩ
mΩ
μA
μA
kΩ
μs
IFWD1+2
PMOS Current Limit
IFWD2+3
PMOS Current Limit
IFWD3+4
PMOS Current Limit
1A Boost Regulator
FB2 = VIN (Note 6)
FB3 = VIN (Note 6)
FB4 = VIN (Note 6)
5.6 A
4A
2.4 A
IVIN5 PWM Mode
Burst Mode Operation
VOUT5(MAX)
IFWD5
Maximum Regulated Output Voltage
Forward Current Limit
VFB5(HIGH)
VFB5(LOW)
VLSB5
IFB5
DCMAX5
RPMOS5
Feedback Regulation Voltage
Feedback Regulation Voltage
FB5 Regulation Voltage Step Size
Feedback Leakage Current
Maximum Duty Cycle
PMOS On-Resistance
RNMOS5
NMOS On-Resistance
ILEAKP
PMOS Switch Leakage Current
ILEAKN
NMOS Switch Leakage Current
ROUTPD5
Output Pull-Down Resistance in Shutdown
tSS5 Soft-Start Time
1A Buck-Boost Regulator
VFB5 = 0.85V (Notes 4, 5)
VFB5 = 0.85V (Notes 4, 5)
(Note 6)
PWM Mode Full-Scale (1,1,1,1)
PWM Mode Full-Scale (0,0,0,0)
VFB5 = 0.85V
NMOS Switch
Boost Regulator Off
5.35
2.5
l 780
l 405
–50
–2
–2
150 300
35 60
5.55 5.75
3.15 3.9
800 820
425 445
25
50
90
260
275
2
2
10
500
μA
μA
V
A
mV
mV
mV
nA
%
mΩ
mΩ
μA
μA
kΩ
μs
IVIN6
VOUT6(LOW)
VOUT6(HIGH)
IFWD6
IPEAK6
PWM Mode
Burst Mode Operation
Minimum Regulated Output Voltage
Maximum Regulated Output Voltage
Forward Current Limit
Peak Current Limit
VFB6 = 0.85V (Note 4, 5)
VFB6 = 0.85V(Note 4, 5)
PWM Mode (Note 6)
Burst Mode Operation (Note 6)
220 400
20 40
2.65 2.8
5.25 5.65
2.1 2.65 3.2
200 275 350
μA
μA
V
V
A
mA
IZERO6
VFB6(HIGH)
VFB6(LOW)
VLSB6
Zero Current Limit
Feedback Regulation Voltage
Feedback Regulation Voltage
FB6 Regulation Voltage Step Size
Burst Mode Operation
PWM Mode Full-Scale (1,1,1,1)
PWM Mode Full-Scale (0,0,0,0)
–30
l 780
l 405
0 30
800 820
425 445
25
mA
mV
mV
mV
3675f
5
5 Page 
DataSheet.in
TYPICAL PERFORMANCE CHARACTERISTICS
LTC3675
Boost Regulator, Line Regulation
5.020
PWM MODE
5.016
5.012
5.008
5.004
LOAD = 500mA
5.000
4.996
LOAD = 100mA
4.992
4.988
4.984
4.980
2.7 3.1 3.5 3.9 4.3 4.7 5.1 5.5
VIN (V)
3675 G28
Boost Regulator Transient
Response (Burst Mode Operation)
VOUT5
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
500mA/DIV
0mA
50μs/DIV
LOAD STEP = 100mA to 600mA
VIN = 3.6V, VOUT5 = 5V
3675 G30
Boost Regulator Transient
Response (PWM Mode)
VOUT5
100mV/DIV
AC-COUPLED
INDUCTOR
CURRENT
200mA/DIV
200μs/DIV
LOAD STEP = 100mA to 600mA
VIN = 3.6V, VOUT5 = 5V
3675 G29
Boost Regulator, No Load
Start-Up Transient, PWM Mode
VIN = 3.6V
VOUT5
2V/DIV
INDUCTOR
CURRENT
500mA/DIV
50μs/DIV
3675 G31
Boost Regulator,
VOUT5 vs Temperature
5.10
PWM MODE, LOAD = 500mA
5.08
5.06
5.04 VIN = 3.6V
5.02
5.00
4.98
4.96
VIN = 4.2V
4.94
VIN = 2.7V
4.92
4.90
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G32
Boost Regulator, Forward Current
Limit vs Temperature
3.50
3.45
3.40
3.35
3.30
3.25 VIN = 3.6V
3.20
3.15 VIN = 4.2V
3.10 VIN = 2.7V
3.05
3.00
2.95
2.90
2.85
2.80
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
3675 G33
3675f
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11 Page | ||
| Páginas | Total 36 Páginas | |
| PDF Descargar | [ Datasheet LTC3675.PDF ] | |
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