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| 型号： | LTC3633IUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A DL 28QFN |
| 标准包装： | 73 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 14.7 V |
| 输入电压： | 3.6 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 500kHz ~ 4MHz |
| 电流 - 输出： | 3A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 28-QFN（4x5） |
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LTC3633
FEATURES
Dual Channel 3A, 15V
Monolithic Synchronous
Step-Down Regulator
DESCRIPTION
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3.6V to 15V Input Voltage Range
3A Output Current per Channel
Up to 95% Efficiency
Low Duty Cycle Operation: 5% at 2.25MHz
Selectable 0°/180° Phase Shift Between Channels
Adjustable Switching Frequency: 500kHz to 4MHz
External Frequency Synchronization
Current Mode Operation for Excellent Line and
Load Transient Response
0.6V Reference Allows Low Output Voltages
User Selectable Burst Mode ? Operation or Forced
Continuous Operation
Output Voltage Tracking and Soft-Start Capability
Short-Circuit Protected
Overvoltage Input and Overtemperature Protection
Low Power 2.5V Linear Regulator Output
Power Good Status Outputs
Available in (4mm × 5mm) QFN-28 and 28-Lead
TSSOP Packages
The LTC ? 3633 is a high efficiency, dual-channel monolithic
synchronous buck regulator using a controlled on-time,
current mode architecture, with phase lockable switching
frequency. The two channels can run 180° out of phase,
which relaxes the requirements for input and output ca-
pacitance. The operating supply voltage range is from 3.6V
to 15V, making it suitable for dual cell lithium-ion batteries
as well as point of load power supply applications from
a 12V or 5V supply.
The operating frequency is programmable and synchroniz-
able from 500kHz to 4MHz with an external resistor. The
high frequency capability allows the use of small surface
mount inductors and capacitors. The unique constant
frequency/controlled on-time architecture is ideal for high
step-down ratio applications that operate at high frequency
while demanding fast transient response. An internal phase
lock loop servos the on-time of the internal one-shot timer
to match the frequency of the internal clock or an applied
external clock.
Distributed Power Systems
Battery Powered Instruments
Point of Load Power Supplies
APPLICATIONS
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TYPICAL APPLICATION
V IN
12V
The LTC3633 can select between forced continuous mode
and high efficiency Burst Mode operation.
L , LT, LTC, LTM, Burst Mode, Linear Technology 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, 5847554, 6580258, 6304066, 6476589,
6774611.
Efficiency vs Load Current
INTV CC
RT
47μF
x2
RUN1
RUN2
V IN2 V IN1
ITH1
ITH2
LTC3633
MODE/SYNC
PHMODE
V2P5
2.2μF
100
90
80
70
60
50
Burst Mode
OPERATION
100
10
1
TRACKSS2
TRACKSS1
40
0.1
V FB2
V OUT2
5V AT 3A
22μF
1.5μH
73.2k
0.1μF
10k
PGOOD2
BOOST2
SW2
V ON2
SGND PGND
PGOOD1
BOOST1
SW1
V ON1
V FB1
0.1μF
10k
1μH
45.3k
V OUT1
3.3V AT 3A
22μF
30
20
10
0
1
V IN = 12V
10
V OUT = 5V
V OUT = 3.3V
100 1000 10000
LOAD CURRENT (mA)
3633 TA01b
0.01
0.001
3633 TA01a
3633fc
For more information www.linear.com/LTC3633
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