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參數(shù)資料
| 型號： | LTC3548 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 12-Bit To 24-Bit Registered Bus Exchanger With 3-State Outputs 56-SSOP -40 to 85 |
| 中文描述： | 雙同步，400mA/800mA，2.25MHz降壓直流/直流穩(wěn)壓器 |
| 文件頁數(shù)： | 1/16頁 |
| 文件大?。?/td> | 239K |
| 代理商： | LTC3548 |
LTC3548
1
3548f
, LTC and LT are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Burst Mode is a registered
trademark of Linear Technology Corporation. Protected by U.S. Patents including 5481178,
6580258, 6304066, 6127815, 6498466, 6611131.
APPLICATIOU
■
PDAs/Palmtop PCs
■
Digital Cameras
■
Cellular Phones
■
Portable Media Players
■
PC Cards
■
Wireless and DSL Modems
FEATURES
TYPICAL APPLICATIO
U
DESCRIPTIO
U
■
High Efficiency: Up to 95%
■
Very Low Quiescent Current: Only 40
μ
A
■
2.25MHz Constant Frequency Operation
■
High Switch Current: 0.7A and 1.2A
■
No Schottky Diodes Required
■
Low R
DS(ON)
Internal Switches: 0.35
■
Current Mode Operation for Excellent Line
and Load Transient Response
■
Short-Circuit Protected
■
Low Dropout Operation: 100% Duty Cycle
■
Ultralow Shutdown Current: I
Q
< 1
μ
A
■
Output Voltages from 5V down to 0.6V
■
Power-On Reset Output
■
Externally Synchronizable Oscillator
■
Small Thermally Enhanced MSOP and 3mm
×
3mm
DFN Packages
Dual Synchronous,
400mA/800mA, 2.25MHz
Step-Down DC/DC Regulator
The LTC
3548 is a dual, constant frequency, synchronous
step down DC/DC converter. Intended for low power
applications, 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 profile
≤
1.2mm. Each output voltage is adjustable
from 0.6V to 5V. Internal synchronous 0.35
, 0.7A/1.2A
power switches provide high efficiency 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 efficiency. Burst
Mode
operation provides high efficiency at light loads,
while Pulse Skip 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
current of only 40
μ
A. In shutdown, the device draws <1
μ
A.
LTC3548 Efficiency Curve
Figure 1. 2.5V/1.8V at 400mA/800mA Step-Down Regulators
RUN2
V
IN
V
IN
= 2.8V
TO 5.5V
V
OUT2
= 2.5V
V
= 1.8V
AT 800mA
RUN1
POR
SW1
V
FB1
GND
V
FB2
SW2
MODE/SYNC
LTC3548
10
μ
F
100k
RESET
33pF
68pF
2.2
μ
H
4.7
μ
H
887k
604k
301k
280k
4.7
μ
F
10
μ
F
3548 TA01
LOAD CURRENT (mA)
1
E
100
95
90
85
80
75
70
65
60
P
1000
100
10
1
0.1
10
100
1000
3548 TA02
V
= 3.3V, V
= 1.8V
Burst Mode OPERATION
CHANNEL 1, NO LOAD ON CHANNEL 2
POWER LOSS
EFFICIENCY
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3548EMSE | Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3701EGN | 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller |
| LTC3701 | 16-Bit Universal Bus Driver With 3-State Outputs 48-SSOP -40 to 85 |
| LTC3708 | No RSENSE Low EMI, Synchronous DC/DC Controller with Output Tracking |
| LTC3736 | CTV 5C 5#20 SKT PLUG |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3548-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator |
| LTC3548-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548AEDD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548AEDD#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 10DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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