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參數(shù)資料
| 型號(hào)： | LTC3713EG |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Low Input Voltage, High Power, No RSENSE Synchronous Buck DC/DC Controller |
| 中文描述： | 2 A SWITCHING CONTROLLER, 1900 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 11/24頁 |
| 文件大?。?/td> | 325K |
| 代理商： | LTC3713EG |
11
LTC3713
3713fa
APPLICATIOU
W
U
U
range with respect to zero current. This can be accom-
plished by introducing an offset into the sense voltage as
shown in Figure 2.
The first step in calculating the amount of required offset
voltage is to determine the maximum sense voltage.
V
SENSE
= I
OUT(MAX)
R
SENSE
A good rule of thumb is to set the maximum sense voltage
for a current limit that is 30% greater than the maximum
source current.
The voltage on pin V
RNG
should be set based on the value
of V
SENSE
.
V
RNG
= V
SENSE
/0.133
V
OS
can be calculated using the following formula:
V
OS
= 0.6V
SENSE
The offset voltage is added as shown in Figure 2 and can
be set by choosing the values of R
OS1
and R
OS2
:
V
R
R
R
OS
OS
+
1
2
V
OS
OUT
OS
=
1
The offset voltage must be scaled to V
OUT
to avoid inter-
fering with the internal current limit foldback.
Power MOSFET Selection
The LTC3713 requires two external N-channel power
MOSFETs, one for the top (main) switch and one for the
bottom (synchronous) switch. Important parameters for
the power MOSFETs are the breakdown voltage V
(BR)DSS
,
threshold voltage V
(GS)TH
, on-resistance R
DS(ON)
, reverse
transfer capacitance C
RSS
and maximum current I
DS(MAX)
.
The gate drive voltage is set by the 5V INTV
CC
supply.
Consequently, logic-level threshold MOSFETs must be
used in LTC3713 applications.
When the bottom MOSFET is used as the current sense
element, particular attention must be paid to its
on-resistance. MOSFET on-resistance is typically speci-
fied with a maximum value R
DS(ON)(MAX)
at 25
°
C. In this
case, additional margin is required to accommodate the
rise in MOSFET on-resistance with temperature:
R
R
DS ON MAX
(
SENSE
ρ
T
)(
)
=
The
ρ
T
term is a normalization factor (unity at 25
°
C)
accounting for the significant variation in on-resistance
with temperature, typically about 0.4%/
°
C as shown in
Figure 3. For a maximum junction temperature of 100
°
C,
using a value
ρ
T
= 1.3 is reasonable.
JUNCTION TEMPERATURE (
°
C)
–50
ρ
T
1.0
1.5
150
3713 F03
0.5
0
0
50
100
2.0
Figure 3. R
DS(ON)
vs Temperature
R
SENSE
3713 F02
V
OS
SENSE
+
SENSE
–
SENSE
+
WITHOUT
R
SENSE
V
OUT
+
–
R
OS1
R
OS2
Figure 2. Sense Voltage Offset
The power dissipated by the top and bottom MOSFETs
strongly depends upon their respective duty cycles and
the load current. When the LTC3713 is operating in
continuous mode, the duty cycles for the MOSFETs are:
D
V
V
D
V
V
V
TOP
OUT
IN
BOT
IN
OUT
IN
=
=
–
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| LTC3713EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3713EG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3713EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3714EG | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3714EG#PBF | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
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