參數(shù)資料
型號(hào)： LTC1705
廠商： Linear Technology Corporation
英文描述： Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
中文描述： 雙550kHz的同步開關(guān)，5位VID和150mA LDO穩(wěn)壓器控制器
文件頁數(shù)： 23/28頁
文件大?。?/td> 326K
代理商： LTC1705
LTC1705
23
APPLICATIU
converter is converting 15V to 1.3V, requiring just a 9%
duty cycle. Inductor voltages are now 13.7V when QT is on
and 1.3V when QB is on, giving vastly different di/dt values
and correspondingly skewed transient response with posi-
tive and negative current steps. The narrow 9% duty cycle
usually requires a lower switching frequency, which in
turn requires a higher value inductor and larger output
capacitor. Parasitic losses due to the large voltage swing
at the source of QT cost efficiency, eliminating any advan-
tage the 1-step conversion might have had.
Note that power dissipation in the LTC1705 portion of a
2-step circuit is lower than it would be in a typical 1-step
converter, even in cases where the 1-step converter has
higher total efficiency than the 2-step system. In a typical
microprocessor core supply regulator, for example, the
regulator is usually located right next to the CPU. In a
1-step design, all of the power dissipated by the core
W
U
U
regulator is right there next to the hot CPU, aggravating
thermal management. In a 2-step LTC1705 design, a
significant percentage of the power lost in the core regu-
lation system happens in the 5V or 3.3V supply, which is
usually away from the CPU. The power lost to heat in the
LTC1705 section of the system is relatively low, minimiz-
ing the heat near the CPU.
Additionally, with a 1-step converter, the high input battery
voltage requires the MOSFET to operate at high voltage
levels. This imposes stringent requirements on the
MOSFETs selection. Most of the MOSFETs that meet the
high voltage and high current requirements are expensive
and bulky. This makes for an awkward power supply
design, especially in portable applications. The high input
voltage also necessitates higher gate drive, which aggra-
vate switching losses.
Figure 10. 2-Step Conversion Block Diagram
2-STEP CONVERSION OFFERS
BETTER TRANSIENT RESPONSE
SMALLER COMPONENT SIZE
BETTER THERMAL MANAGEMENT
LOWER VOLTAGE REQUIREMENT FOR MOSFETS
SMALLER SWITCHING LOSS
EQUIVALENT EFFICIENCY
LTC1628*
5V/3A LOGIC SUPPLY
1.5V/2A CPU I/O SUPPLY
1.3V/15A CPU CORE SUPPLY
3.3V/5A LOGIC SUPPLY
2.5V/0.15A CPU CLOCK SUPPLY
*OR TWO LTC1625s
I/O
CORE
LTC1705
CPU SUPPLY CONTROLLER
LDO
1705 F10
相關(guān)PDF資料
PDF描述
LTC1705EGN Dual 550kHz Synchronous Switching Regulator Controller with 5-Bit VID and 150mA LDO
LTC1710 Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70
LTC1710C Synchronous 8-Bit Up/Down Binary Counters 24-PDIP 0 to 70
LTC1710CMS8 Dual 16-By-4 Register Files 24-SOIC 0 to 70
LTC1710CS8 SMBus Dual Monolithic High Side Switch
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC1705EGN 功能描述:IC PWR SUPPLY CONTROLLER 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC1705EGN#PBF 功能描述:IC PWR SUPPLY CONTROLLER 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC1705EGN#TR 功能描述:IC PWR SUPPLY CONTROLLER 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC1705EGN#TRPBF 功能描述:IC PWR SUPPLY CONTROLLER 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC1706CS8-19 功能描述:IC VID VOLTAGE PROGRAMMER 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
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