参数资料
型号: LTC3415EUHF#TRPBF
厂商: Linear Technology
文件页数: 1/28页
文件大小: 0K
描述: IC REG BUCK SYNC ADJ 7A 38QFN
标准包装: 2,500
系列: PolyPhase®
类型: 降压(降压)
输出类型: 可调式
输出数: 1
输出电压: 0.7 V ~ 5.5 V
输入电压: 2.5 V ~ 5.5 V
PWM 型: 电流模式,混合
频率 - 开关: 1.5MHz
电流 - 输出: 7A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 38-WFQFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 38-QFN(5x7)
LTC3415
7A, PolyPhase
Synchronous Step-Down
Regulator
FEATURES
DESCRIPTION
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High Ef?ciency: Up to 96%
7A Output Current at V IN = 3V
Adjustable Frequency: 1.5MHz Nominal
PolyPhase Operation (Up to 12 Phases)
Spread Spectrum Frequency Modulation
Output Tracking and Margining
±1% Reference Accuracy
2.5V to 5.5V V IN Range
Phase Lockable from 0.75MHz to 2.25MHz
Selectable Burst Mode ? Operation
Low Dropout Operation: 100% Duty Cycle
Low Quiescent Current: 450μA
Current Mode Operation for Excellent Line and Load
Transient Response
Shutdown Mode Draws Only 0.2μA Supply Current
Available in 38-Pin (5mm × 7mm) QFN Package
The LTC ? 3415 is a high ef?ciency, monolithic synchronous
buck regulator using a phase lockable constant frequency,
current mode architecture. PolyPhase ? operation allows
multiple LTC3415s to run out of phase while using mini-
mal input and output capacitance. The operating supply
range is from 5.5V down to 2.5V, making it suitable for
single Lithium-Ion battery as well as point of load power
supply applications. Burst Mode operation provides high
ef?ciency at low load currents. 100% duty cycle provides
low dropout operation that extends operating time in bat-
tery-operated systems.
The operating frequency is internally set at 1.5MHz, al-
lowing the use of small surface mount inductors. For
switching-noise sensitive applications, it can be externally
synchronized from 0.75MHz to 2.25MHz. The PHMODE
pin allows user control of the phase of the outgoing clock
signal. The current sense comparator is factory trimmed
Point of Load Power Supply
Portable Instruments
APPLICATIONS
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for accurate output current sharing. Burst Mode operation
is inhibited during synchronization or when the MODE pin
is pulled low to reduce noise and RF interference.
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Distributed Power Systems
Battery-Powered Equipment
, LT, LTC, LTM, Burst Mode and PolyPhase are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815, 6498466,
6611131.
TYPICAL APPLICATION
V IN , 2.5V to 5.5V
Ef?ciency and Power Loss
22μF
100
10
CLKIN
SV IN
PV IN
SW
x3
90
CLKOUT
PHMODE
SW
SW
80
70
EFFICIENCY
1
60k
PLLLPF
RUN
TRACK
LTC3415
SW
SW
0.2μH
V OUT
1.8V
47μF
x3
60
50
40
POWER LOSS
0.1
FB
MODE
PGOOD
30
20
10
2.5V
3.3V
0.01
120k
I TH
SGND
PGND
0
0.01
0.1 1
5V
10
0.001
LOAD CURRENT (A)
3415 TA01
3415 TA01B
Figure 1. High Ef?ciency Step-Down Converter
3415fa
1
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