參數(shù)資料
型號(hào)： LT3689EMSE-5#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁(yè)數(shù)： 11/32頁(yè)
文件大?。?/td> 2188K
代理商： LT3689EMSE-5#TRPBF
LT3689/LT3689-5
19
3689fd
Most applications running at VIN greater than 20V will
require a small phase lead capacitor, ranging from 2pF to
about30pF,betweentheFBpinandVOUTforgoodtransient
response. The circuits in the Typical Applications section
use the appropriate phase lead capacitors and are stable
at all input voltages.
If the output capacitor is different than the recommended
capacitor, stability should be checked across all operating
conditions, including load current, input voltage and tem-
perature. The LT1375 data sheet contains a more thorough
discussion of loop compensation and describes how to
test the stability using a transient load. Figure 4 shows
the transient response when the load current is stepped
from 360mA to 720mA and back to 360mA.
Low Ripple Burst Mode Operation and Pulse-Skipping
Mode
TheLT3689iscapableofoperatingineitherlowrippleBurst
Modeoperationorpulse-skippingmode,whichisselected
using the SYNC pin. See the Synchronization section for
details. To enhance efficiency at light loads, the LT3689
can be operated in low ripple Burst Mode operation that
keeps the output capacitor charged to the proper voltage
whileminimizingtheinputquiescentcurrent.DuringBurst
Mode operation, the LT3689 delivers single cycle bursts of
current to the output capacitor followed by sleep periods
where the output power is delivered to the load by the
outputcapacitor.BecausetheLT3689delivers powertothe
output with single, low current pulses, the output ripple is
kept below 15mV for a typical application. The LT3689-5
has a slightly higher output ripple of 25mV. This higher
ripple can be reduced by using a larger output capacitor.
In addition, VIN and OUT quiescent currents are reduced
to typically 50A and 75A, respectively, during the sleep
time. As the load current decreases towards a no-load
condition, the percentage of time that the LT3689 operates
in sleep mode increases and the average input current is
greatly reduced, resulting in high efficiency even at very
low loads (see Figure 5).
At higher output loads (above approximately 60mA at
VIN=12Vforthefrontpageapplication)theLT3689willbe
running at the frequency programmed by the RT resistor,
and will be operating in standard PWM mode. The transi-
tion between PWM and low ripple Burst Mode operation
is seamless, and will not disturb the output voltage. If low
quiescent current is not required, the LT3689 can oper-
ate in pulse-skipping mode. The benefit of this mode is
that the LT3689 will enter full frequency standard PWM
operation at a lower output load current than when in
Burst Mode operation. The front page application circuit
will switch at full frequency at output loads higher than
about 15mA at 12VIN.
APPLICATIONS INFORMATION
Figure 4. Transient Load Response of the LT3689 Front
Page Application as the Load Current is Stepped from
360mA to 720mA. VOUT = 3.3V, VIN = 12V
Figure 5. Burst Mode Operation
10s/DIV
VOUT
50mV/DIV
IL
250mA/DIV
3689 F04
5s/DIV
VOUT
10mV/DIV
VIN = 12V, FRONT PAGE APPLICATION
ILOAD = 8mA
VSW
5V/DIV
IL
0.2A/DIV
3689 F05
相關(guān)PDF資料
PDF描述
LT3689EUD-5#TRPBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16
LT3689EMSE-5#PBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16
LT3689IUD-5#TRPBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PQCC16
LT3689IMSE-5#TRPBF 1.95 A SWITCHING REGULATOR, 2160 kHz SWITCHING FREQ-MAX, PDSO16
LT3692IUH#TRPBF 5.8 A DUAL SWITCHING CONTROLLER, 2750 kHz SWITCHING FREQ-MAX, PQCC32
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LT3689EMSE-PBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer
LT3689EMSE-TRPBF 制造商:LINER 制造商全稱:Linear Technology 功能描述:700mA Step-Down Regulator with Power-On Reset and Watchdog Timer
LT3689EUD#PBF 功能描述:IC REG BUCK ADJ 0.7A 16QFN 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:- 設(shè)計(jì)資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT
LT3689EUD#TRPBF 功能描述:IC REG BUCK ADJ 0.7A 16QFN 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:2,500 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，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
LT3689EUD-5#PBF 功能描述:IC REG BUCK 5V 0.7A 16QFN 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:2,500 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，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤
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