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| 型号： | LTC3417EDHC#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 16DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz，600kHz ~ 4MHz |
| 电流 - 输出： | 800mA，1.4A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-DFN（5x3） |
LTC3417
Dual Synchronous
1.4A/800mA 4MHz
Step-Down DC/DC Regulator
FEATURES
DESCRIPTION
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High Ef?ciency: Up to 95%
1.4A/800mA Guaranteed Minimum Output Current
No Schottky Diodes Required
Programmable Frequency Operation: 1.5MHz or
Adjustable From 0.6MHz to 4MHz
Low R DS(ON) Internal Switches
Short-Circuit Protected
V IN : 2.25V to 5.5V
Current Mode Operation for Excellent Line and
Load Transient Response
125μA Quiescent Current in Sleep Mode
Ultralow Shutdown Current: I Q < 1μA
Low Dropout Operation: 100% Duty Cycle
Power Good Output
Phase Pin Selects 2nd Channel Phase Relationship
with Respect to 1st Channel
Internal Soft-Start with Individual Run Pin Control
Available in Small Thermally Enhanced
The LTC ? 3417 is a dual constant frequency, synchronous
step-down DC/DC converter. Intended for medium power
applications, it operates from a 2.25V to 5.5V input volt-
age range and has a constant programmable switching
frequency, allowing the use of tiny, low cost capacitors
and inductors 2mm or less in height. Each output voltage
is adjustable from 0.8V to 5V. Internal synchronous low
R DS(ON) power switches provide high ef?ciency without
the need for external Schottky diodes.
A user selectable mode input allows the user to trade
off ripple voltage for light load ef?ciency. Burst Mode ?
operation provides high ef?ciency at light loads, while
Pulse Skip mode provides low ripple noise at light loads.
A phase mode pin allows the second channel to operate
in-phase or 180° out-of-phase with respect to channel 1.
Out-of-phase operation produces lower RMS current on
V IN and thus lower RMS derating on the input capacitor.
(5mm × 3mm) DFN and 20-Lead TSSOP Packages
APPLICATIONS
To further maximize battery life, the P-channel MOSFETs
are turned on continuously in dropout (100% duty cycle)
and both channels draw a total quiescent current of only
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PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
PC Cards
Wireless and DSL Modems
125μA. In shutdown, the device draws <1μA.
L , LT, LTC, LTM and Burst Mode 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, 6144194.
TYPICAL APPLICATION
OUT2 Ef?ciency
(Burst Mode Operation)
V IN
2.5V TO 5.5V
100
REFER TO FIGURE 4
10
10μF
V IN
95
1
V OUT1
1.8V
1.4A
22pF
511k
1.5μH
V IN
FREQ
SW1
RUN1
V FB1
LTC3417
SW2
RUN2
V FB2
2.2μH
V IN
22pF
866k
V OUT2
2.5V
800mA
90
85
80
EFFICIENCY
POWER LOSS
0.1
0.01
22μF
412k
I TH1
I TH2
412k
10μF
75
V IN = 3.6V
0.001
5.9k
2200pF
GND
2.87k
6800pF
70
0.001
V OUT = 2.5V
FREQ = 1MHz
0.01 0.1
1
0.0001
3417 TA01
LOAD CURRENT (A)
3417 TA01a
3417fd
1
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