參數(shù)資料
型號(hào)： LTC3534EDHC
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1150 kHz SWITCHING FREQ-MAX, PDSO16
封裝： 5 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WJED-1, DFN-16
文件頁(yè)數(shù)： 20/20頁(yè)
文件大?。?/td> 218K
代理商： LTC3534EDHC
LTC3534
9
3534f
OPERATION
The LTC3534 provides high efciency, low noise power
for a wide variety of handheld electronic devices. Linear
Technology’s proprietary topology allows input voltages
above, below or equal to the output voltage by properly
phasing the output switches. The error amplier output
voltage on VC determines the output duty cycle of the
switches. Since VC is a ltered signal, it provides rejection
of frequencies from well below the switching frequency.
The low RDS(ON), low gate charge synchronous switches
provide high frequency pulse width modulation control at
high efciency. High efciency is achieved at light loads
when Burst Mode operation is invoked and the LTC3534’s
quiescent current drops to a mere 25μA.
LOW NOISE FIXED FREQUENCY OPERATION
Oscillator
The frequency of operation is internally set to 1MHz.
Error Amplier
The error amplier is a voltage mode amplier. The loop
compensation components are congured around the
amplier (from FB to VC) to obtain stability of the converter.
For improved bandwidth, an additional R-C feedforward
network can be placed across the upper feedback divider
resistor. The voltage on RUN/SS clamps the error amplier
output, VC, to provide a soft-start function.
Supply Current Limits
There are two different supply current limit circuits in the
LTC3534, each having internally xed thresholds.
The rst circuit is an average current limit amplier, sourcing
current out of FB to drop the output voltage should the peak
input current exceed 1.8A typical. This method provides a
closed loop means of clamping the input current. During
conditions where VOUT is near ground, such as during a
short circuit or start-up, this threshold is cut to 800mA
typical, providing a foldback feature. For this current limit
feature to be most effective, the Thevenin resistance from
FB to ground should be greater than 100k.
Should the peak input current exceed 2.6A typical, the
second circuit, a high speed peak current limit compara-
tor, shuts off PMOS switch A. The delay to output of this
comparator is typically 50ns.
Reverse Current Limit
During xed frequency operation, the LTC3534 operates
in forced continuous conduction mode. The reverse cur-
rent limit comparator monitors the inductor current from
the output through PMOS switch D. Should this negative
inductor current exceed 500mA typical, the LTC3534 shuts
off switch D.
Four-Switch Control
Figure 1 shows a simplied diagram of how the four internal
switches are connected to the inductor, PVIN, VOUT, PGND1
and PGND2. Figure 2 shows the regions of operation for
the LTC3534 as a function of the internal control voltage,
VCI. Dependent on the magnitude of VCI, the LTC3534 will
operate in buck, buck-boost or boost mode. VCI is a level
5
SW1
6
SW2
L1
PMOS A
NMOS B
12
PVIN
PMOS D
NMOS C
3534 F01
11
4
7
VOUT
PGND1
PGND2
85%
DMAX
BOOST
DMIN
BOOST
DMAX
BUCK
DUTY
CYCLE
0%
V4 ( 1.2V)
INTERNAL
CONTROL
VOLTAGE, VCI
V3 ( 720mV)
BOOST REGION
BUCK REGION
BUCK-BOOST REGION
V2 ( 640mV)
V1 ( 100mV)
3534 F02
A ON, B OFF
PWM C AND D
SWITCHES
D ON, C OFF
PWM A AND B
SWITCHES
FOUR SWITCH PWM
Figure 1. Simplied Diagram of Output Switches
Figure 2. Switch Control vs Internal Control Voltage, VCI
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3534EDHC#PBF 功能描述:IC REG BUCK BOOST SYNC ADJ 16DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC3534EDHC#TRPBF 功能描述:IC REG BUCK BOOST SYNC ADJ 16DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC3534EGN#PBF 功能描述:IC REG BUCK BST SYNC 0.5A 16SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)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(lèi)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(yè)面:1032 (CN2011-ZH PDF) 其它名稱(chēng):296-25628-2
LTC3534EGN#TRPBF 功能描述:IC REG BUCK BST SYNC 0.5A 16SSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán)
LTC3535 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Dual Channel 550mA 1MHz Synchronous Step-Up DC/DC Converter
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