參數(shù)資料
型號(hào)： LT3507HUHF#TRPBF
廠商： Linear Technology
文件頁(yè)數(shù)： 13/28頁(yè)
文件大小： 302K
描述： IC REG QD BUCK/LINEAR 38-QFN
產(chǎn)品培訓(xùn)模塊： More Information on LDOs
標(biāo)準(zhǔn)包裝： 2,500
拓?fù)洌?/td> 降壓（降壓）（1），線性（LDO）（1）
功能： 任何功能
輸出數(shù)： 4
頻率 - 開(kāi)關(guān)： 900kHz ~ 1.1MHz
電壓/電流 - 輸出 1： 0.8 V ~ 32.4 V，2.4A
電壓/電流 - 輸出 2： 0.8 V ~ 32.4 V，1.5A
電壓/電流 - 輸出 3： 0.8 V ~ 32.4 V，1.5A
帶 LED 驅(qū)動(dòng)器： 無(wú)
帶監(jiān)控器： 無(wú)
帶序列發(fā)生器： 是
電源電壓： 4 V ~ 36 V
工作溫度： -40°C ~ 150°C
安裝類型： 表面貼裝
封裝/外殼： 38-WFQFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 38-QFN（5x7）
包裝： 帶卷 (TR)
LT3507
13
3507fa
Electrolytic capacitors are also an option. The ESRs of
most aluminum electrolytic capacitors are too large to
deliver low output ripple. Tantalum, as well as newer,
lower-ESR organic electrolytic capacitors intended for
power supply use are suitable. Chose a capacitor with a
low enough ESR for the required output ripple. Because
the volume of the capacitor determines its ESR, both the
size and the value will be larger than a ceramic capacitor
that would give similar ripple performance. One bene t
is that the larger capacitance may give better transient
response for large changes in load current. Table 2 lists
several capacitor vendors.
Table 2. Low ESR Surface Mount Capacitors
VENDOR
TYPE
SERIES
Taiyo-Yuden
Ceramic
AVX
Ceramic
Tantalum
TPS
Kemet
Tantalum
Tantalum Organic
Aluminum Organic
T491,T494,T495
T520
A700
Sanyo
Tantalum or
Aluminum Organic
POSCAP
Panasonic    Aluminum Organic
SP CAP
TDK
Ceramic
Diode Selection
The catch diode (D1 from Figure 2) conducts current only
during switch off time. Average forward current in normal
operation can be calculated from:
   
I
D(AVG)
=
I
OUT
V
IN
V
OUT
(
)
V
IN
The only reason to consider a diode with a larger current
rating than necessary for nominal operation is for the
worst-case condition of shorted output. The diode current
will then increase to the typical peak switch current. Peak
reverse voltage is equal to the regulator input voltage.
Use a diode with a reverse voltage rating greater than the
input voltage. The programmable OVLO can protect the
diode from excessive reverse voltage by shutting down
the regulator if the input voltage exceeds the maximum
rating of the diode. Table 3 lists several Schottky diodes
and their manufacturers.
Table 3. Schottky Diodes
PART NUMBER
V
R
 
(V)
I
AVE
(A)
V
F
 AT 1A
(mV)
V
F
 AT 2A
(mV)
On Semiconductor
MBRM120E
20
1
530    595
MBRM140
40
1
550
Diodes Inc
B120
20
1
500
B140
40
1
500
B220
20
2
500
B240
40
2
500
DFLS140L
40
1
550
DFLS240L
40
2
550
Boost Pin Considerations
The capacitor and diode tied to the BOOST pin generate a
voltage that is higher than the input voltage. In most cases,
a small ceramic capacitor and fast switching diode (such
as the CMDSH-3 or MMSD914LT1) will work well. The
capacitor value is a function of the switching frequency,
peak current, duty cycle and boost voltage; in general a
value of (0.1糉 " 1MHz/f
SW
) works well. Figure 3 shows
three ways to arrange the boost circuit. The BOOST pin
must be more than 2.5V above the SW pin for full ef-
 ciency. For outputs of 3.3V and higher, the standard
circuit (Figure 3a) is best. For outputs between 2.8V and
3.3V, use a small Schottky diode (such as the BAT54).
For lower output voltages, the boost diode can be tied
to the input (Figure 3b). The circuit in Figure 3a is more
ef cient because the BOOST pin current comes from a
lower voltage source. Finally, as shown in Figure 3c, the
anode of the boost diode can be tied to another source
that is at least 3V. For example, if you are generating 3.3V
and 1.8V and the 3.3V is on whenever the 1.8V is on, the
1.8V boost diode can be connected to the 3.3V output. In
this case, the 3.3V output cannot be set to track the 1.8V
output (see Output Voltage Tracking).
In any case, be sure that the maximum voltage at the
BOOST pin is less than 55V and the voltage difference
between the BOOST and SW pins is less than 25V.
The minimum operating voltage of an LT3507 applica-
tion is limited by the internal undervoltage lockout (4V
for Channel 1, 3V for Channels 2 and 3) and by the
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LT3507IUHF#PBF 功能描述:IC REG QD BUCK/LINEAR 38-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 + 切換式 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 拓?fù)?降壓（降壓）同步（3），線性（LDO）（2） 功能:任何功能 輸出數(shù):5 頻率 - 開(kāi)關(guān):300kHz 電壓/電流 - 輸出 1:控制器 電壓/電流 - 輸出 2:控制器 電壓/電流 - 輸出 3:控制器 帶 LED 驅(qū)動(dòng)器:無(wú) 帶監(jiān)控器:無(wú) 帶序列發(fā)生器:是 電源電壓:5.6 V ~ 24 V 工作溫度:-40°C ~ 85°C 安裝類型:* 封裝/外殼:* 供應(yīng)商設(shè)備封裝:* 包裝:*
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