參數(shù)資料
型號(hào)： LT1316IS8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SPDT, 1/4 Amp Two Circuit Pushbutton
中文描述： 0.75 A SWITCHING REGULATOR, PDSO8
封裝： 0.150 INCH, PLASTIC, SOP-8
文件頁(yè)數(shù)： 8/16頁(yè)
文件大小： 344K
代理商： LT1316IS8
8
LT1316
APPLICATIO
S I
N
FOR
ATIO
U
Discontinuous Mode Operation
A boost converter with a high V
OUT
:V
IN
ratio operates with
a high duty cycle in continuous mode. For duty cycles
exceeding the LT1316’s guaranteed minimum specifica-
tion of 0.73, the circuit will need to be designed for
discontinuous operation. Additionally, very low peak cur-
rent limiting below 50mA may necessitate operating in this
mode unless high inductance values are acceptable. When
operating in discontinuous mode, a different equation
governs available output power. For each switch cycle, the
inductor current ramps down to zero, completely releas-
ing the stored energy. Energy stored in the inductor at any
time is equal to 1/2 LI
2
. Because this energy is released
each cycle, the equation for maximum power out is:
W
U
P
OUT(MAX)
= 1/2L(I
PEAK2
)f
)
Where f =
+ t
OFF
1
I
PEAK
(L)
V
IN
– V
SAT
)
When designing for very low peak currents (<50mA), the
inductor size needs to be large enough so that on-time is
a least 1
μ
s. On-time can be calculated by the equation:
(V
IN
– V
SAT
)
)
On-Time =
I
PEAK
L
)
where V
SAT
= 0.2V.
Also, at these low current levels, current overshoot due to
power transistor turn-off delay will be a significant portion
of peak current. Increasing inductor size will keep this to
a minimum.
Design Example 1
Requirements: V
IN
= 2V, V
OUT
= 5V and I
LOAD
= 10mA.
1. Find duty cycle
V
OUT
– V
SAT
+ V
D
)
Because duty cycle is less than the LT1316 minimum
specification (0.73), the circuit can be designed for
continuous operation.
DC = V
OUT
– V
IN
+ V
D
)
=
= 0.654
5 – 2 + 0.4
5 – 0.2 + 0.4
)
)
2.
I
PEAK
= 2(I
OUT
)
1 – DC=
= 58mA
2(10mA)
1 – 0.654
3. Find L
L = V
OUT
– V
IN
+ V
D
0.4(I
PEAK
)
5 – 2 + 0.4
)
)
)
=
= 293
μ
H
0.4(58mA)
)
t
OFF
2
μ
s
4. Find R
SET
resistor
Overshoot =
300ns
V
IN
L
)
330
μ
H
)
)
)
=
= 1.8mA
2
Find R
SET
from Figure 3 for 58mA – 1.8mA = 56.2mA
R
SET
≈
47k
Design Example 2
Requirements: V
IN
= 3.3V, V
OUT
= 28V and I
LOAD
= 5mA.
1. Find duty cycle:
V
OUT
– V
SAT
+ V
D
)
Because duty cycle exceeds LT1316 minimum specifi-
cation of 73%, the circuit must be designed for discon-
tinuous operation.
2. Find P
OUT(MAX)
Multiply P
OUT
by 1.4 to give a safe operating margin
P
OUT(MAX)
= P
OUT
(1.4) = (5mA)(28V)(1.4) = 0.196W
3. Set the on-time to the data sheet minimum of 3.4
μ
s and
find L
DC = V
OUT
– V
IN
+ V
D
)
=
= 0.89
28 – 3.3 + 0.4
)
28 – 0.2 + 0.4
)
L =
(t
ON2
)(V
IN
– V
SAT
)
2
2P
OUT(MAX)
(t
ON
+ t
OFF
)
(3.4
μ
s
2
)(3.3 – 0.2)
2
2(0.196W)(3.4
μ
s + 2
μ
s)
=
= 52
μ
H
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參數(shù)描述
LT1316IS8#PBF 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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: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
LT1316IS8#PBF 制造商:Linear Technology 功能描述:DC-DC CONVERTER, BOOST, 500mA, SOIC-8
LT1316IS8#TR 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC RoHS:否 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: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
LT1316IS8#TRPBF 功能描述:IC REG BST FLYBK ADJ 0.5A 8SOIC 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: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
LT1317 制造商:LINER 制造商全稱:Linear Technology 功能描述:Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter
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