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参数资料
| 型号： | LTC3615EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A DL 24QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 400kHz ~ 4MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
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LTC3615/LTC3615-1
Dual 4MHz, 3A Synchronous
Step-Down DC/DC Converter
FEATURES
DESCRIPTION
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High Efficiency: Up to 94%
Dual Outputs with 2 × 3A Output Current Capability
Low Output Ripple Burst Mode ? Operation: I Q = 130μA
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° (LTC3615) or selectable
140°/180° (LTC3615-1) Phase Shift Between Channels
Fixed Internal and Programmable External Soft-Start
Accurate Start-Up Tracking Capability
DDR Memory Mode I OUT = ±1.5A
Available in 4mm × 4mm QFN-24 and TSSOP-24 Packages
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.
Point-of-Load Supplies
Distributed Power Supplies
Portable Computer Systems
DDR Memory Termination
Handheld Devices
APPLICATIONS
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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.
SV IN
PV IN1
PV IN2
FB1
PHASE
PGOOD2
V IN = 3.3V
TYPICALAPPLICATION
V IN
100μF
RUN1 SW1
TRACK/SS1
PGOOD1
ITH1 LTC3615
SRLIM
R T /SYNC
MODE
SW2
RUN2
TRACK/SS2
FB2
ITH2 SGND PGND
3615 TA01a
0.47μH
0.47μH
422k
210k
665k
210k
V OUT1
1.8V/3A
47μF
V OUT2
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 0.001
10 2.25MHz V IN = 4V
V OUT = 2.5V V IN = 5V
0 0.0001
0.001 0.01 0.1 1
OUTPUT CURRENT (A)
3615 TA01b
1
For more information www.linear.com/LTC3615
3615fb
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