LTC3615 LINER [Linear Technology], LTC3615 Datasheet
LTC3615
Manufacturer Part Number
LTC3615
Description
Dual 4MHz, 3A Synchronous Step-Down DC/DC Converter
Manufacturer
LINER [Linear Technology]
Datasheet
1.LTC3615.pdf
(32 pages)
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LTC3615EUF
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FeaTures
applicaTions
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Typical applicaTion
V
IN
High Efficiency: Up to 94%
Dual Outputs with 2 × 3A Output Current Capability
Low Output Ripple Burst Mode
2.25V to 5.5V Input Voltage Range
±1% Output Voltage Accuracy
Output Voltages Down to 0.6V
Programmable Slew Rate at Switch Pins
Low Dropout Operation: 100% Duty Cycle
Shutdown Current ≤1µA
Adjustable Switching Frequency Up to 4MHz
Internal or External Compensation
Selectable Pulse-Skipping/Forced Continuous/
Burst Mode Operation with Adjustable Burst Clamp
Optional Active Voltage Positioning (AVP) with
Internal Compensation
Selectable 0°/90°/180° Phase Shift Between Channels
Fixed Internal and Programmable External Soft-Start
Accurate Start-Up Tracking Capability
DDR Memory Mode I
Available in 4mm × 4mm QFN-24 and TSSOP-24 Packages
Point-of-Load Supplies
Distributed Power Supplies
Portable Computer Systems
DDR Memory Termination
Handheld Devices
100µF
RUN1
TRACK/SS1
PGOOD1
ITH1
SRLIM
R
MODE
PHASE
RUN2
TRACK/SS2
PGOOD2
ITH2
T
SV
/SYNC
IN
OUT
SGND
PV
LTC3615
IN1
= ±1.5A
PGND
®
PV
Operation: I
IN2
3615 TA01a
SW1
SW2
FB1
FB2
0.47µH
0.47µH
Q
= 130µA
422k
210k
665k
210k
Step-Down DC/DC Converter
47µF
47µF
V
1.8V/3A
V
2.5V/3A
OUT1
OUT2
Dual 4MHz, 3A Synchronous
DescripTion
The LTC
tor 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, drop-
ping to zero current in shutdown. The 2.25V to 5.5V input
supply range makes the LTC3615 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° of phase shift between the two channels
can be selected to minimize input current ripple and
output voltage ripple in a single 6A output configuration.
Programmable slew rate limiting reduces EMI, and external
synchronization 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 is 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.
®
3615 is a dual 3A synchronous step-down regula-
Efficiency and Power Loss vs Load Current
100
90
80
70
60
50
40
30
20
10
0
0.001
2.25MHz
V
OUT
= 2.5V
0.01
OUTPUT CURRENT (A)
0.1
1
V
V
V
IN
IN
IN
= 3.3V
= 4V
= 5V
LTC3615
3615 TA01b
10
1
0.1
0.01
0.001
0.0001
3615f
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