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參數(shù)資料
| 型號： | LT3503EDCB |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封裝： | 2 X 3 MM, PLASTIC, MO-229, DFN-6 |
| 文件頁數(shù)： | 19/20頁 |
| 文件大?。?/td> | 423K |
| 代理商： | LT3503EDCB |
8
LT3503
3503f
APPLICATIO S I FOR ATIO
WU
U
FB Resistor Network
The output voltage is programmed with a resistor divider
between the output and the FB pin. Choose the 1%
resistors according to:
RR
V
OUT
12
078
1
=
.
–
R2 should be 20.0k or less to avoid bias current errors.
Reference designators refer to the Block Diagram.
An optional phase lead capacitor of 22pF between VOUT
and FB reduces light-load output ripple.
Input Voltage Range
The input voltage range for LT3503 applications depends
on the output voltage and on the absolute maximum
ratings of the VIN and BOOST pins.
The minimum input voltage is determined by either the
LT3503’s minimum operating voltage of 3.6V, or by its
maximum duty cycle. The duty cycle is the fraction of time
that the internal switch is on and is determined by the input
and output voltages:
DC
VV
V
OUT
D
IN
SW
D
=
+
–
where VD is the forward voltage drop of the catch diode
(~0.4V) and VSW is the voltage drop of the internal switch
(~0.4V at maximum load). This leads to a minimum input
voltage of:
V
VV
DC
VV
IN MIN
OUT
D
MAX
D
SW
()
–
=
+
with DCMAX = 0.81 (0.76 over temperature).
The maximum input voltage is determined by the absolute
maximum ratings of the VIN and BOOST pins. For con-
stant-frequency operation the maximum input voltage is
determined by the minimum duty cycle, DCMIN = 0.29. If
the duty cycle requirement is less than DCMIN, the part will
enter pulse-skipping mode. The onset of pulse-skipping
occurs at:
V
VV
DC
VV
IN PS
OUT
D
MIN
D
SW
()
–
=
+
In pulse-skipping mode the part skips pulses to control the
inductor current and regulate the output voltage, possibly
producing a spectrum of frequencies below 2.2MHz.
Note that this is a restriction on the operating input voltage
to remain in constant-frequency operation; the circuit will
tolerate transient inputs up to the absolute maximum
ratings of the VIN and BOOST pins when the output is in
regulation. The input voltage should be limited to VIN(PS)
during overload conditions (short-circuit or start-up).
Minimum On Time
The part will still regulate the output at input voltages that
exceed VIN(PS) (up to 20V), but the output voltage ripple
increases. Figure 1 illustrates switching waveforms in
continuous mode for a 0.78V output application near
VIN(PS) = 6V.
As the input voltage is increased, the part is required to
switch for shorter periods of time. Delays associated with
turning off the power switch dictate the minimum on time
of the part. The minimum on time for the LT3503 is
~130ns. Figure 2 illustrates the switching waveforms
when the input voltage is increased to VIN = 14V.
Figure 1
Figure 2
VSW
10V/DIV
VOUT
20mV/DIV
COUT = 47F
VOUT = 0.78V
VIN = 7V
ILOAD = 1.1A
L = 1.1
H
1
s/DIV
3503 F01
IL
1A/DIV
VSW
10V/DIV
VOUT
20mV/DIV
COUT = 47F
VOUT = 0.78V
VIN = 14V
ILOAD = 1.1A
L = 1.1
H
1
s/DIV
3503 F02
IL
1A/DIV
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相關代理商/技術參數(shù) |
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|---|---|
| LT3503EDCB#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 6-Pin DFN EP 制造商:Linear Technology 功能描述:REG SWITCHING STEP DOWN 1A 2.2MHZ 制造商:Linear Technology 功能描述:REG, SWITCHING, STEP DOWN, 1A 2.2MHZ 制造商:Linear Technology 功能描述:SP-SWREG/Monolithic, Cut Tape 1A, 2.2MHz Buck Regulator ;RoHS Compliant: Yes |
| LT3503EDCB#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 20V 6-Pin DFN EP T/R |
| LT3503EDCB#TRMPBF | 功能描述:IC REG BUCK ADJ 1A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 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 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 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:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3503EDCB#TRPBF | 功能描述:IC REG BUCK ADJ 1A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 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 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 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) 供應商設備封裝:8-SOIC |
| LT3503EDCBTRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-20V DFN6EP |
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