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參數(shù)資料
| 型號(hào)： | LTC1517CS5-3.3#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | PLASTIC, SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 5/8頁(yè) |
| 文件大?。?/td> | 149K |
| 代理商： | LTC1517CS5-3.3#PBF |
5
LTC1517-3.3
APPLICATIONS INFORMATION
WU
U
Output Ripple
Normal LTC1517-3.3 operation produces voltage ripple
on the VOUT pin. Output voltage ripple is required for the
parts to regulate. Low frequency ripple exists due to the
hysteresis in the sense comparator and propagation de-
lays in the charge pump enable/disable circuits. High
frequency ripple is also present mainly from the ESR
(equivalent series resistance) in the output capacitor.
Typical output ripple with VIN = 2.5V under maximum load
is 75mV peak-to-peak with a low ESR 3.3
F output capaci-
tor (minimum recommended COUT). For applications
requiring VIN to exceed 3.3V or for applications requiring
less than 75mV of peak-to-peak ripple, a 6.8
F to 10F
COUT capacitor is recommended. Slight further decreases
in output ripple can be achieved by using COUT capacitors
larger than 10
F.
Short-Circuit/Thermal Protection
During short-circuit conditions, the LTC1517-3.3 will draw
between 20mA and 150mA from VIN, causing a rise in
junction temperature. On-chip thermal shutdown circuitry
disables the charge pump once the junction temperature
exceeds approximately 160
°C. The charge pump is
reenabled once the junction temperature drops to approxi-
mately 145
°C. The LTC1517-3.3 will cycle in and out of
thermal shutdown indefinitely without latchup or damage
until the VOUT short is removed.
Operation
The LTC1517-3.3 uses a switched-capacitor charge pump
to boost VIN to a 3.3V ±4% regulated output. The part
achieves regulation by sensing the output voltage through
an internal resistor divider and enabling the charge pump
when the divided output droops below the comparator’s
lower trip point (set by VREF). When the charge pump is
enabled, a 2-phase nonoverlapping clock controls the
internal charge pump switches. Flying capacitor C1 is
charged to VIN on phase one of the clock. On phase two of
the clock, C1 is stacked in series with VIN and connected
to VOUT through an internal switch. This sequence of
charging and discharging the flying capacitor occurs at a
free running frequency of 700kHz (typ) and continues until
the divided output voltage reaches the upper trip point of
the comparator. Once the output is back in regulation, the
charge pump is disabled. This method of bursting the
charge pump on and off enables the LTC1517-3.3 to
achieve high efficiency at extremely low output loads.
Capacitor Selection
For best performance, it is recommended that low ESR
capacitors be used for both CIN and COUT to reduce noise
and ripple. The CIN and COUT capacitors should be either
ceramic or tantalum and should be 3.3
F or greater.
Ceramic capacitors will provide the smallest size for a
given capacitance. If the input source impedance is very
low (< 0.5
), CIN may not be needed. Ceramic capacitors
are recommended for the flying capacitor C1 with values
of 0.1
F or 0.22F. Smaller value flying capacitors may be
used in low IOUT applications.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC1517CS5-5 | 制造商:Linear Technology 功能描述:DC to DC Converter, +5V, 6 Pin, TSOP |
| LTC1517CS5-5#PBF | 制造商:Linear Technology 功能描述:Charge Pump STPUP 5V 20mA 5-Pin TSOT-23 制造商:Linear Technology 功能描述:DC-DC CONVERTER MICROPOWER 5 制造商:Linear Technology 功能描述:DC-DC CONVERTER, MICROPOWER, 5V, 20mA, SOT-23-5; Primary Input Voltage:5V; No. of Outputs:1; Output Voltage:5V; Output Current:20mA; No. of Pins:5; Operating Temperature Min:0C; Operating Temperature Max:70C ;RoHS Compliant: Yes |
| LTC1517CS5-5#TR | 功能描述:IC REG SWITCHED CAP 5V SOT23-5 RoHS:否 類別: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:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC |
| LTC1517CS55#TRM | 制造商:Linear Technology 功能描述:Charge Pump STPUP 5V 20mA 5-Pin TSOT-23 T/R |
| LTC1517CS5-5#TRM | 功能描述:IC REG SWITCHED CAP 5V SOT23-5 RoHS:否 類別: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:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):52kHz 電流 - 輸出:1A 同步整流器:無(wú) 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
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