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参数资料
| 型号： | LTC3548EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 10DFN |
| 标准包装： | 121 |
| 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： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 400mA，800mA |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3548
Dual Synchronous,
400mA/800mA, 2.25MHz
Step-Down DC/DC Regulator
FEATURES
DESCRIPTION
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High Ef?ciency: Up to 95%
Very Low Quiescent Current: Only 40μA
Low Output Ripple Burst Mode ? Operation
2.25MHz Constant-Frequency Operation
High Switch Current: 0.7A and 1.2A
No Schottky Diodes Required
Low R DS(ON) Internal Switches: 0.35Ω
Current Mode Operation for Excellent Line
and Load Transient Response
Short-Circuit Protected
Low Dropout Operation: 100% Duty Cycle
Ultralow Shutdown Current: I Q < 1μA
Output Voltages from 5V down to 0.6V
Power-On Reset Output
Externally Synchronizable Oscillator
Small Thermally Enhanced MSOP and 3mm × 3mm
DFN Packages
The LTC ? 3548 is a dual, constant-frequency, synchronous
step down DC/DC converter. Intended for low power ap-
plications, it operates from 2.5V to 5.5V input voltage
range and has a constant 2.25MHz switching frequency,
allowing the use of tiny, low cost capacitors and inductors
with a pro?le ≤1mm. Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35Ω, 0.7A/1.2A
power switches provide high ef?ciency without the need
for external Schottky diodes.
A user selectable mode input is provided to allow the user
to trade-off noise ripple for low power ef?ciency. Burst
Mode operation provides high ef?ciency at light loads,
while pulse-skipping mode provides low noise ripple at
light loads.
To further maximize battery runtime, the P-channel
MOSFETs are turned on continuously in dropout (100%
duty cycle), and both channels draw a total quiescent cur-
APPLICATIONS
rent of only 40μA. In shutdown, the device draws <1μA.
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PDAs/Palmtop PCs
Digital Cameras
Cellular Phones
Portable Media Players
PC Cards
Wireless and DSL Modems
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, 6127815, 6304066, 6498466, 6580258
6611131..
TYPICAL APPLICATION
LTC3548 Ef?ciency Curve
V IN = 2.8V
TO 5.5V
100
1000
10μF
RUN2
V IN
RUN1
100k
95
MODE/SYNC
POR
RESET
90
EFFICIENCY
100
V OUT2 = 2.5V
AT 400mA
4.7μH
68pF
SW2
LTC3548
SW1
2.2μH
33pF
V OUT1 = 1.8V
AT 800mA
85
80
10
POWER LOSS
75
887k
V FB2
V FB1
604k
70
1
4.7μF
280k
GND
301k
10μF
65
V IN = 3.3V, V OUT = 1.8V
Burst Mode OPERATION
Figure 1. 2.5V/1.8V at 400mA/800mA Step-Down Regulators
3548 TA01
60
1
CHANNEL 1, NO LOAD ON CHANNEL 2
0.1
10 100 1000
LOAD CURRENT (mA)
3548 TA02
3548fc
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3548EDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548EKD-1#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10UTDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3548EKD-1#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 10UTDFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3548EKD-1-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator |
| LTC3548EKD-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator |
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