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| 型号： | LTC3546IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 28TSSOP |
| 标准包装： | 2,000 |
| 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 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz，750kHz ~ 4MHz |
| 电流 - 输出： | 1A，2A |
| 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： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
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LTC3546
Dual Synchronous, 3A/1A
or 2A/2A Configurable
Step-Down DC/DC Regulator
FEATURES
DESCRIPTION
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V IN Range: 2.25V to 5.5V
V OUT Range: 0.6V to 5V
Programmable Frequency Operation; 2.25MHz, or
Adjustable Between 0.75MHz to 4MHz
Low R DS(ON) Internal Switches
High Efficiency: Up to 96%
No Schottky Diodes Required
Short-Circuit Protected
Current Mode Operation for Excellent Line and Load
Transient Response
Low Ripple Burst Mode Operation (30mV P-P ),
I Q = 160μA
Ultralow Shutdown Current: I Q < 1μA
Low Dropout Operation: 100% Duty Cycle
Power Good Output For Each Channel
Externally or Internally Programmable Burst Level
External or Internal Soft-Start or Supply Tracking
Available in Thermally Enhanced 28-Lead
(4mm × 5mm) QFN and TSSOP Packages
The LTC ? 3546 is a dual, constant-frequency, synchronous
step down DC/DC converter for medium power applications.
The design consists of 2A and 1A primary output switches.
In addition to the 2A/1A capability, a 1A dependant output
switch can be externally connected to either of the primary
outputs to produce 3A/1A dual regulator or 2A/2A dual
regulator configurations.
Supply operation is from 2.25V to 5.5V. The switch-
ing frequency can be set to 2.25MHz, adjustable from
0.75MHz to 4MHz, or synchronized to an external clock.
Each output is adjustable from 0.6V to 5V and has output
tracking on power-up. Internal synchronous low R DS(ON)
power switches provide high efficiency without external
Schottky diodes.
User-selectable modes (Burst Mode ? operation, pulse
skipping and forced continuous) allow a trade-off between
ripple noise and power efficiency. Burst Mode operation
provides high efficiency at light loads. Pulse-skipping
mode provides low ripple noise at light loads.
Netbooks/Ultra-Mobile PCs
PC Cards
Wireless and DSL Modems
Point of Load DC/DC Conversion
APPLICATIONS
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TYPICAL APPLICATION
The device is capable of low dropout configurations and
both channels can operate at 100% duty cycle. In shut-
down, the device draws <1μA.
L , LT, LTC, LTM, Linear Technology, the Linear logo 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, 6611131, 6304066, 6498466, 6580258.
V IN
3.6V TO
5.5V
V OUT2
2.5V, 3A
C IN
22μF
0.56μH
100pF
V IN1 V CCA V CCD V IN2
SYNC/MODE
PGOOD2 PGOOD1
SW2A SW1
SW2B
SW1D
1.22μH
100pF
V OUT1
1.2V, 1A
V OUT2 Efficiency (Burst Mode Operation)
100 100
SW1D CONNECTED TO SW2
V IN = 3.6V
95 V OUT = 2.5V 10
90 EFFICIENCY 1
68μF
95.3k
V IN
30.1k V IN
RUN2 LTC3546 RUN1
V FB2 V FB1
BMC2 BMC1
TRACK/SS2 TRACK/SS1
PHASE FREQ
I TH2 I TH1
V IN
V IN
30.1k
30.1k
22μF
85
80
75
POWER LOSS
0.1
0.01
0.001
10pF
13k
1000pF
PGND2
GNDA
PGND1
13k
1000pF
10pF
70
0.001
0.01
0.1
1
10
0.0001
1
EXPOSED PAD
3546 TA01a
For more information www.linear.com/3546
LOAD CURRENT (A)
3546 TA01b
3546fc
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相关代理商/技术参数 |
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| LTC3546IUFD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1A/2A 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
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| LTC3546IUFDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator |
| LTC3547 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 300mA Synchronous Step-Down Regulator |
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