参数资料
型号: LTC1773EMS#PBF
厂商: Linear Technology
文件页数: 1/20页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 10-MSOP
标准包装: 50
PWM 型: 电流模式
输出数: 1
频率 - 最大: 600kHz
占空比: 100%
电源电压: 2.65 V ~ 8.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 10-TFSOP,10-MSOP(0.118",3.00mm 宽)
包装: 管件
产品目录页面: 1333 (CN2011-ZH PDF)
LTC1773
Synchronous Step-Down
DC/DC Controller
FEATURES
DESCRIPTIO
High Efficiency: Up to 95%
Constant Frequency 550kHz Operation
V IN from 2.65V to 8.5V
V OUT from 0.8V to V IN
OPTI-LOOP ? Compensation Minimizes C OUT
Synchronizable up to 750kHz
Selectable Burst Mode Operation
Low Quiescent Current: 80 μ A
Low Dropout Operation: 100% Duty Cycle
Secondary Winding Regulation
Soft-Start
Current Mode Operation for Excellent Line and
Load Transient Response
Low Shutdown I Q = 10 μ A
± 1.5% Reference Accuracy
Precision 2.5V Undervoltage Lockout
Available in 10-Lead MSOP
The LTC ? 1773 is a current mode synchronous buck regu-
lator controller that drives external complementary power
MOSFETs using a fixed frequency architecture. The oper-
ating supply range is from 2.65V to 8.5V, making it
suitable for 1- or 2-cell lithium-ion battery powered appli-
cations. Burst Mode ? operation provides high efficiency at
low load currents. 100% duty cycle provides low dropout
operation which extends operating time in battery-oper-
ated systems.
The operating frequency is internally set at 550kHz, allow-
ing the use of small surface mount inductors. For switch-
ing-noise sensitive applications, it can be synchronized up
to 750kHz. Peak current limit is user programmable with
an external high side sense resistor. A SYNC/FCB control
pin guarantees regulation of secondary windings regard-
less of load on the main output by forcing continuous
operation. Burst Mode operation is inhibited during syn-
APPLICATIO S
chronization or when the SYNC/FCB pin is pulled low to
reduce noise and RF interference. Soft-start is provided by
Cellular Telephones
RF PA Supplies
Portable Instruments
Wireless MODEMS
Distributed Power Systems
Notebook and Palm Top Computers, PDAs
Single and Dual Cell Lithium-Ion Powered Devices
an external capacitor.
Synchronous rectification increases efficiency and elimi-
nates the need for a Schottky diode, saving components
and board space. The LTC1773 comes in a 10-lead MSOP
package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
OPTI-LOOP and Burst Mode are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents, including 5481178, 6580258, 6304066, 6127815.
TYPICAL APPLICATIO
V IN
2.65V TO 8.5V
100
High Efficiency
SYNC/FCB V IN
RUN/SS SENSE –
R SENSE
0.025 ?
+
C IN
68 μ F
95
90
V IN = 3.3V
V IN = 5V
0.1 μ F
47pF
30k
I TH
LTC1773
TG
SW
L1
3 μ H
V OUT
2.5V
85
80
75
V IN = 8V
220pF
V FB
GND
BG
Si9801DY
+ C OUT
180 μ F
70
65
60
80.6k
169k
1773 F01
55
1
10
L = SUMIDA CDRH6D28-3R0
100 1000 5000
OUTPUT CURRENT (mA)
Figure 1. Step-Down Converter
1773 F1b
1773fb
1
相关PDF资料
PDF描述
LTC1775CS#PBF IC REG CTRLR BUCK PWM CM 16-SOIC
LTC1778EGN-1#PBF IC REG CTRLR BUCK PWM CM 16-SSOP
LTC1779ES6#TRPBF IC REG BUCK ADJ 0.25A SOT23-6
LTC1844ES5-1.5#TRM IC REG LDO 1.5V .15A TSOT23-5
LTC1871EMS#PBF IC REG CTRLR BST FLYBK CM 10MSOP
相关代理商/技术参数
参数描述
LTC1775CGN 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC1775CGN#PBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC1775CGN#TR 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC1775CGN#TRPBF 功能描述:IC REG CTRLR BUCK PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX
LTC1775CS 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX