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參數(shù)資料
| 型號(hào)： | LTC1436ACGN-PLL |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | 0.150 INCH, PLASTIC, SSOP-24 |
| 文件頁數(shù)： | 16/28頁 |
| 文件大小： | 518K |
| 代理商： | LTC1436ACGN-PLL |
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16
LTC1436A
LTC1436-PLL-A/LTC1437A
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Topside MOSFET Driver Supply (C
B
, D
B
)
An external bootstrap capacitor C
B
connected to the Boost
pin supplies the gate drive voltage for the topside
MOSFET(s). Capacitor C
B
in the functional diagram is
charged through diode D
B
from INTV
CC
when the SW pin
is low. When one of the topside MOSFET(s) is to be turned
on, the driver places the C
B
voltage across the gate source
of the desired MOSFET. This enhances the MOSFET and
turns on the topside switch. The switch node voltage SW
rises to V
IN
and the Boost pin rises to V
IN
+ INTV
CC
. The
value of the boost capacitor C
B
needs to be 100 times
greater than the total input capacitance of the topside
MOSFET(s). In most applications 0.1
μ
F is adequate. The
reverse breakdown on D
B
must be greater than V
IN(MAX).
Output Voltage Programming
The output voltage is pin selectable for all members of the
LTC1436A/LTC1437A family. The output voltage is
selected by the V
PROG
pin as follows:
V
PROG
= 0V
V
PROG
= INTV
CC
V
PROG
= Open (DC)
The LTC1436A/LTC1437A family also has remote output
voltage sense capability. The top of an internal resistive
divider is connected to V
OSENSE
. For fixed 3.3V and 5V
output voltage applications the V
OSENSE
pin is connected
to the output voltage as shown in Figure 5a. When using
an external resistive divider, the V
PROG
pin is left open (DC)
and the V
OSENSE
pin is connected to the feedback resistors
as shown in Figure 5b.
V
OUT
= 3.3V
V
OUT
= 5V
V
OUT
= Adjustable
Figure 4b. Capacitive Charge Pump for EXT V
CC
Figure 5b. LTC1436A/LTC1437A Adjustable Applications
Figure 5a. LTC1436A/LTC1437A Fixed Output Applications
Power-On Reset Function (POR)
The power-on reset function monitors the output voltage
and turns on an open drain device when it is out of
regulation. An external pull-up resistor is required on the
POR pin.
When power is first applied or when coming out of
shutdown, the POR output is pulled to ground. When the
output voltage rises above a level which is 5% below the
final regulated output value, an internal counter starts.
After counting 2
16
(65536) clock cycles, the POR pull-
down device turns off.
The POR output will go low whenever the output voltage
drops below 7.5% of its regulated value for longer than
approximately 30
μ
s, signaling an out-of-regulation condi-
tion. In shutdown, the POR output is pulled low even if the
regulator’s output is held up by an external source.
Run/Soft Start Function
The RUN/SS pin is a dual purpose pin that provides the
soft start function and a means to shut down the
LTC1436A/LTC1437A. Soft start reduces surge currents
from V
IN
by gradually increasing the internal current limit.
Power supply sequencingcan also be accomplished
using this pin.
EXTV
CC
V
IN
TGL
TGS
SW
BG
PGND
LTC1436A
LTC1437A
N-CH
N-CH
N-CH
+
C
IN
V
IN
0.22
μ
F
BAT85
BAT85
C
OUT
BAT85
+
1
μ
F
+
L1
R
SENSE
VN2222LL
1436 F04b
V
PROG
SGND
LTC1436A
LTC1437A
1436 F05a
C
OUT
V
OUT
GND: V
= 3.3V
INTV
CC
: V
OUT
= 5V
+
V
OSENSE
R1
R2
OPEN (DC)
1436 F05b
100pF
1.19V
≤
V
OUT
≤
9V
V
PROG
SGND
LTC1436A
LTC1437A
V
OSENSE
V
OUT
= 1.19V 1 +
R2
R1
(
)
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| LTC1436ACGN-PLL#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: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 |
| LTC1436ACGN-PLL#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: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 |
| LTC1436ACGN-PLL#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: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 |
| LTC1436AEGN#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:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 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 ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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