參數(shù)資料
型號： LTC1702AIGN
英文描述： SMPS Controller
中文描述： 開關(guān)電源控制器
文件頁數(shù)： 1/12頁
文件大小： 178K
代理商： LTC1702AIGN
1
LTC1701/LTC1701B
TYPICAL APPLICATION
U
DESCRIPTIO
U
APPLICATIO S
U
1MHz Step-Down
DC/DC Converters in SOT-23
s
PDAs/Palmtop PCs
s
Digital Cameras
s
Cellular Phones
s
Portable Media Players
s
PC Cards
s
Handheld Equipment
, LTC and LT are registered trademarks of Linear Technology Corporation.
s
Tiny 5-Lead SOT-23 Package
s
Uses Tiny Capacitors and Inductor
s
High Frequency Operation: 1MHz
s
High Output Current: 500mA
s
Low RDS(ON) Internal Switch: 0.28
s
High Efficiency: Up to 94%
s
Current Mode Operation for Excellent Line
and Load Transient Response
s
Short-Circuit Protected
s
Low Quiescent Current: 135
A (LTC1701)
s
Low Dropout Operation: 100% Duty Cycle
s
Ultralow Shutdown Current: IQ < 1A
s
Peak Inductor Current Independent of Inductor Value
s
Output Voltages from 5V Down to 1.25V
The LTC
1701/LTC1701B are the industry’s first SOT-23
step-down, current mode, DC/DC converters. Intended for
low to medium power applications, they operate from 2.5V
to 5.5V input voltage range and switch at 1MHz, allowing
the use of tiny, low cost capacitors and inductors 2mm or
less in height. The output voltage is adjustable from 1.25V
to 5V. A built-in 0.28
switch allows up to 0.5A of output
current at high efficiency. OPTI-LOOP
TM compensation
allows the transient response to be optimized over a wide
range of loads and output capacitors.
The LTC1701 incorporates automatic power saving Burst
Mode
TM operation to reduce gate charge losses when the
load current drops below the level required for continuous
operation. The LTC1701B operates continuously to very
low load currents to provide low ripple at the expense of
light load efficiency. With no load, the LTC1701 draws only
135
A. In shutdown, both devices draw less than 1A,
making them ideal for current sensitive applications.
Their small size and switching frequency enables a
complete DC/DC converter function to consume less than
0.3 square inches of PC board area.
VIN
ITH/RUN
SW
VFB
GND
LTC1701
D1
L1
4.7
H
R4
1M
C1: TAIYO YUDEN JMK316BJ106ML
C2: SANYO POSCAP 6TPA47M
D1: MBRM120L
L1: SUMIDA CD43-4R7
R3
5.1k
C3
330pF
C1
10
F
+
R2
121k
R1
121k
C2
47
F
1701 F01a
VOUT
(2.5V/
500mA)
VIN
2.5V TO
5.5V
+
Figure 1. 2.5V/500mA Step-Down Regulator
Efficiency Curve
Burst Mode and OPTI-LOOP are trademarks of Linear Technology Corporation.
FEATURES
LOAD CURRENT (mA)
1
10
100
1000
EFFICIENCY
(%)
100
95
90
85
80
75
70
65
60
55
50
1701 F01b
VIN = 3.3V
VOUT = 2.5V
LTC1701
LTC1701B
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1702AIGN#PBF 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR)
LTC1702AIGN#TR 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1702AIGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC1702AIGNPBF 制造商:Linear Technology 功能描述:LDO Cntrlr SYNC REG 0.8-7V SSOP24 N
LTC1702CGN 功能描述:IC REG CTRLR BUCK PWM VM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
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