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PDF LTC3675-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3675-1 | |
| Descripción | 7-Channel Configurable High Power PMIC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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 Slave Address Options: LTC3675 = 0001001X,
LTC3675-1 = 0110100X
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
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.
LTC3675/LTC3675-1
7-Channel Configurable
High Power PMIC
Description
The LTC®3675/LTC3675-1 are a digitally programmable
high efficiency multioutput power supplies plus dual
string LED driver ICs optimized for high power single cell
Li-Ion/Polymer applications. The DC/DCs consist of four
synchronous buck converters (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 indepen-
dently 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
programmed
vViaINI2aCndwhitihgha
die temperature may also
maskable interrupt output
be
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/LTC3675-1 are available in a low profile
(0.75mm), thermally enhanced 44-lead 4mm × 7mm
QFN package.
Typical Application
2.7V TO 5.5V
3
DIGITAL
CONTROL
PUSH BUTTON
SW1
VIN SW2
I2C
EN1
EN2
SW3
LTC3675/
LTC3675-1
SW4
SW5
VOUT5
EN3 SWAB6
EN4 SWCD6
ENBB
VOUT6
IRQB
LDO_OUT
RSTB
WAKE
PBSTAT
SW7
ONB
CT
0.01µF
LED1
EXPOSED PAD LED2
36751 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
For more information www.linear.com/LTC3675
36751fc
1
http://www.Datasheet4U.com
1 page  
LTC3675/LTC3675-1
E lectrical 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. (Note 2)
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX
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
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
4
2.4
IVIN5 PWM Mode
Burst Mode Operation
VOUT5(MAX)
Maximum Regulated Output Voltage
IFWD5
Forward Current Limit
VFB5(HIGH)
Feedback Regulation Voltage
VFB5(LOW)
Feedback Regulation Voltage
VLSB5
FB5 Regulation Voltage Step Size
IFB5 Feedback Leakage Current
DCmax5
Maximum Duty Cycle
RPMOS5
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
IVIN6
VOUT6(low)
VOUT6(high)
IFWD6
PWM Mode
Burst Mode Operation
Minimum Regulated Output Voltage
Maximum Regulated Output Voltage
Forward Current Limit
VVFFBB66
=
=
0.85V (Note 4, 5)
0.85V(Note 4, 5)
PWM Mode (Note 6)
220 400
20 40
2.65 2.8
5.25 5.65
2.1 2.65 3.2
IPEAK6
Peak Current Limit
Burst Mode Operation (Note 6)
200 275 350
IZERO6
Zero Current Limit
Burst Mode Operation
–30 0 30
VFB6(HIGH)
VFB6(LOW)
VLSB6
Feedback Regulation Voltage
Feedback Regulation Voltage
FB6 Regulation Voltage Step Size
PWM Mode Full-Scale (1,1,1,1)
PWM Mode Full-Scale (0,0,0,0)
l 780
l 405
800 820
425 445
25
For more information www.linear.com/LTC3675
UNITS
mV
mV
mV
nA
%
mΩ
mΩ
µA
µA
kΩ
µs
A
A
A
µA
µA
V
A
mV
mV
mV
nA
%
mΩ
mΩ
µA
µA
kΩ
µs
µA
µA
V
V
A
mA
mA
mV
mV
mV
36751fc
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http://www.Datasheet4U.com
5 Page 
Typical Performance Characteristics
LTC3675/LTC3675-1
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)
36751 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
36751 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
36751 G29
Boost Regulator, No Load
Start-Up Transient, PWM Mode
VIN = 3.6V
VOUT5
2V/DIV
INDUCTOR
CURRENT
500mA/DIV
50µs/DIV
36751 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
4.94
VIN = 4.2V
VIN = 2.7V
4.92
4.90
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
36751 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)
36751 G33
For more information www.linear.com/LTC3675
36751fc
11
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3675-1.PDF ] | |
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