- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377748 > LTC1439IGW (LINEAR TECHNOLOGY CORP) Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators PDF資料下載
參數(shù)資料
| 型號： | LTC1439IGW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators |
| 中文描述： | 2 A DUAL SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 596K |
| 代理商： | LTC1439IGW |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
20
LTC1438/LTC1439
APPLICATIO
S I
FOR
ATIO
U
When the voltage present at the AUXON pin is greater than
1.19V the regulator/comparator is on. The amplifier is
stable when operating as a low dropout regulator. This
same amplifier can be used as a comparator whose
inverting input is tied to the 1.19V reference.
The AUXDR pin is internally connected to an open drain
MOSFET which can sink up to 10mA. The voltage on
AUXDR determines whether or not an internal 12V resis-
tive divider is connected to AUXFB as described below. A
pull-up resistor is required on AUXDR and the voltage
must not exceed 28V.
With the addition of an external PNP pass device, a linear
regulator capable of supplying up to 0.5A is created. As
shown in Figure 11a, the base of the external PNP con-
nects to the AUXDR pin together with a pull-up resistor.
The output voltage V
OAUX
at the collector of the external
PNP is sensed by the AUXFB pin.
The input voltage to the auxiliary regulator can be taken
from a secondary winding on the primary inductor as
shown in Figure 11a. In this application, the SFB1 pin
regulates the input voltage to the PNP regulator (see SFB1
Pin Operation) and should be set to approximately 1V to
2V above the required output voltage of the auxiliary
regulator. A Zener clamp diode may be required to keep the
secondary winding resultant output voltage under the 28V
AUXDR pin specification when the primary is heavily
loaded and the secondary is not.
The AUXFB pin is the feedback point of the regulator. An
internal resistor divider is available to provide a 12V output
by simply connecting AUXFB directly to the collector of the
external PNP. The internal resistive divider is switched in
when the voltage at AUXFB goes above 9.5V with 1V built-
in hysteresis. For other output voltages, an external resis-
tive divider is fed back to AUXFB as shown in Figure 11b.
The output voltage V
OAUX
is set as follows:
W
U
U
When used as a voltage comparator as shown in Figure
11c, the auxiliary block has a noninverting characteristic.
When AUXFB drops below 1.19V, the AUXDR pin will be
pulled low. A minimum current of 5
μ
A is required to pull
up the AUXDR pin to 5V when used as a comparator output
in order to counteract a 1.5
μ
A internal pull-down current
source.
V
V
R
R
OAUX
=
+
<
=
≥
1 19
.
1
8
7
8V AUXDR<8.5V
V
12V AUXDR
12V
OAUX
–
+
AUXON
AUXFB
ON/OFF
INPUT
V
PULL-UP
<
7.5V
AUXDR
OUTPUT
1438 F11c
1.19V REFERENCE
LTC1439
Figure 11c. Auxiliary Comparator Configuration
LTC1439
AUXDR
AUXFB
SFB1
AUXON
+
+
1438 F11a
V
SEC
SECONDARY
WINDING
1:N
ON/OFF
V
12V
R6
10
μ
F
R5
R6
R5
V
SEC
= 1.19V
> 13V
1 +
(
)
Figure 11a. 12V Output Auxiliary Regulator
Using Internal Feedback Resistors
Figure 11b. 5V Output Auxiliary Regulator Using
External Feedback Resistors
LTC1439
AUXDR
AUXFB
SFB1
AUXON
+
+
1438 F11b
V
SEC
SECONDARY
WINDING
1:N
ON/OFF
V
OAUX
R6
10
μ
F
R5
R8
R7
R6
R5
V
SEC
= 1.19V
> V
OAUX
1 +
(
)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1438IG | DIODE ZENER SINGLE 1000mW 11Vz 50mA-Izt 0.05 4uA-Ir 8.2 PowerDI-123 3K/REEL |
| LTC1438IG-ADJ | DIODE ZENER SINGLE 1000mW 13Vz 50mA-Izt 0.05 2uA-Ir 10 PowerDI-123 3K/REEL |
| LTC1438CG-ADJ | Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators |
| LTC1439CGW | Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators |
| LTC1441IS8 | Ultralow Power Single/Dual Comparator with Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1439IGW#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 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:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1439IGW#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 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:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1439IGW#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 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:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC143ZEFP8TL | 制造商:ROHM Semiconductor 功能描述: |
| LTC1440CDD#PBF | 功能描述:IC COMP SGL LP 1.182V REF 8-DFN RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 標準包裝:25 系列:- 類型:帶電壓基準 元件數(shù):4 輸出類型:CMOS，開路漏極，TTL 電壓 - 電源，單路/雙路(±):2 V ~ 11 V，±1 V ~ 5.5 V 電壓 - 輸入偏移（最小值）:10mV @ 5V 電流 - 輸入偏壓（最小值）:- 電流 - 輸出（標準）:0.015mA @ 5V 電流 - 靜態(tài)（最大值）:8.5µA CMRR, PSRR（標準）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:12µs 磁滯:50mV 工作溫度:0°C ~ 70°C 封裝/外殼:16-DIP（0.300"，7.62mm） 安裝類型:通孔 包裝:管件 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。