|
|
PDF LTC3615-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3615-1 | |
| Descripción | 3A Synchronous Step-Down DC/DC Converter | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC3615-1 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
LTC3615/LTC3615-1
Features
Dual 4MHz, 3A Synchronous
Step-Down DC/DC Converter
Description
n High Efficiency: Up to 94%
n Dual Outputs with 2 × 3A Output Current Capability
n Low Output Ripple Burst Mode® Operation: IQ = 130µA
n 2.25V to 5.5V Input Voltage Range
n ±1% Output Voltage Accuracy
n Output Voltages Down to 0.6V
n Programmable Slew Rate at Switch Pins
n Low Dropout Operation: 100% Duty Cycle
n Shutdown Current ≤1µA
n Adjustable Switching Frequency Up to 4MHz
n Internal or External Compensation
n Selectable Pulse-Skipping/Forced Continuous/
Burst Mode Operation with Adjustable Burst Clamp
n Optional Active Voltage Positioning (AVP) with
Internal Compensation
n Selectable 0°/90°/180° (LTC3615) or selectable
140°/180° (LTC3615-1) Phase Shift Between Channels
n Fixed Internal and Programmable External Soft-Start
n Accurate Start-Up Tracking Capability
n DDR Memory Mode IOUT = ±1.5A
n Available in 4mm × 4mm QFN-24 and TSSOP-24 Packages
Applications
n Point-of-Load Supplies
n Distributed Power Supplies
n Portable Computer Systems
n DDR Memory Termination
n Handheld Devices
The LTC®3615/LTC3615-1 are dual 3A synchronous step-
down regulators using a current mode, constant-frequency
architecture. The DC supply current is only 130µA (Burst
Mode operation at no-load) while maintaining the output
voltages, dropping to zero current in shutdown. The 2.25V
to 5.5V input supply range makes the parts ideally suited
for single Li-Ion applications. 100% duty cycle capability
provides low dropout operation, which extends operating
time in battery-operated systems.
The operating frequency is externally programmable up to
4MHz, allowing the use of small surface mount inductors.
0°, 90°, or 180° (LTC3615) or 140°/180° (LTC3615-1) of
phase shift between the two channels can be selected to
minimize input current ripple and output voltage ripple in a
dual 3A or single 6A output configuration. Programmable
slew rate limiting reduces EMI, and external synchroniza-
tion can be applied up to 4MHz.
The internal synchronous switches increase efficiency
and eliminate the need for external catch diodes, saving
external components and board space.
The LTC3615/LTC3615-1 are offered in leadless 24-pin
4mm × 4mm QFN and thermally enhanced 24-pin TSSOP
packages.
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners. Protected by U.S. Patents, including 5481178, 5994885, 6304066, 6498466, 6580258,
6611131.
Typical Application
VIN
100µF
SVIN PVIN1
RUN1
TRACK/SS1
PGOOD1
ITH1 LTC3615
SRLIM
RT/SYNC
MODE
PVIN2
SW1
FB1
PHASE
RUN2
TRACK/SS2
PGOOD2
ITH2 SGND
SW2
PGND
FB2
3615 TA01a
0.47µH
0.47µH
422k
210k
665k
210k
VOUT1
1.8V/3A
47µF
VOUT2
2.5V/3A
47µF
Efficiency and Power Loss vs Load Current
100 10
90
80 1
70
60 0.1
50
40 0.01
30
20
10 2.25MHz
0 VOUT = 2.5V
0.001
0.01
0.1
VIN = 3.3V
VIN = 4V
VIN = 5V
1
0.001
0.0001
OUTPUT CURRENT (A)
3615 TA01b
For more information www.linear.com/LTC3615
3615fb
1
Free Datasheet http://www.datasheet4u.com/
1 page  
LTC3615/LTC3615-1
Typical Performance Characteristics VIN = 3.3V, RT/SYNC = SVIN, unless otherwise noted.
Efficiency vs Load Current
(VMODE = 0V)
100
90
VOUT = 1.8V
80
70
60
50
40
30
20
10
0
0.001
VIN = 2.5V
VIN = 3.3V
VIN = 5V
0.01 0.1
1
OUTPUT CURRENT (A)
10
3615 G01
Efficiency vs Load Current
(VMODE = 0V)
100
90
VOUT = 1.2V
80
70
60
50
40
30
20
10
0
0.001
VIN = 2.5V
VIN = 3.3V
VIN = 5V
0.01 0.1
1
OUTPUT CURRENT (A)
10
3615 G02
Efficiency vs Load Current
(VMODE = 0V)
100
90
VOUT = 2.5V
80
70
60
50
40
30
20
10
0
0.001
VIN = 3.3V
VIN = 4V
VIN = 5V
0.01 0.1
1
OUTPUT CURRENT (A)
10
3615 G03
Efficiency vs Load Current
(VMODE = 0.55 • SVIN)
100
90
VOUT = 1.8V
80
70
60
50
40
30
20
10
0
0.001
VIN = 2.25V
VIN = 3.3V
VIN = 5V
0.01 0.1
1
OUTPUT CURRENT (A)
10
3615 G04
Efficiency vs Load Current
(VMODE = 0.55 • SVIN)
100
90
VOUT = 1.2V
80
70
60
50
40
30
20
10
0
0.001
VIN = 2.25V
VIN = 3.3V
VIN = 5V
0.01 0.1
1
OUTPUT CURRENT (A)
10
3615 G05
Efficiency vs Input Voltage
(VMODE = 0V)
95 VOUT = 1.8V
90
85
80
75
70
65 IOUT = 3A
60 IOUT = 2A
IOUT = 1A
55 IOUT = 0.3A
50 IOUT = 0.2A
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
3615 G06
Load Regulation
0.5 VMODE = 1.5V
0.4 INTERNAL
0.3
COMPENSATION
(ITH = SVIN )
0.2
0.1
0 EXTERNAL
–0.1 COMPENSATION
–0.2
–0.3
–0.4
0
0.5 1 1.5 2 2.5 3
OUTPUT CURRENT (A)
3615 G07
Line Regulation
0.20
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
2.25 2.75 3.25 3.75 4.25 4.75 5.25
INPUT VOLTAGE (V)
3615 G08
For more information www.linear.com/LTC3615
3615fb
5
Free Datasheet http://www.datasheet4u.com/
5 Page 
Functional Block Diagram
LTC3615/LTC3615-1
PGOOD1
FB1
VREF
IDEAL
DIODE
MODE
TRACK/SS1
DELAY
PGOOD
WINDOW-
COMPARATOR
ITH1 CHANNEL 1
ERROR
+
AMPLIFIER BURST
COMPARATOR
INTERNAL/
EXTERNAL
COMPENSATION
ITH-VOLTAGE
LIMIT
– MODE
+
SLOPE
COMPENSATION
PMOS
CURRENT
COMPARATOR
–
PMOS
CURRENT SENSE
PVIN1
SOFT-START
CONTROLLER LOGIC
GATE DRIVER
SW1
RUN1
RUN2
RT /SYNC
PHASE
SVIN
SGND
UNDERVOLTAGE
LOCKOUT
PGOOD2
FB2
TRACK/SS2
CLK1
OR PLL
OSCILLATOR
AND PHASE
SELECTOR
CLK2
SHUTDOWN
REVERSE
CURRENT
COMPARATOR
+ NMOS
CURRENT SENSE
– 0A
SRLIM
PGND
DUPLICATE FOR CHANNEL 2
PVIN2
SW2
ITH2
3615 FD
For more information www.linear.com/LTC3615
3615fb
11
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3615-1.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC3615-1 | 3A Synchronous Step-Down DC/DC Converter | Linear |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |