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參數(shù)資料
| 型號： | LTC1435ACG#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| 中文描述： | 2 A SWITCHING CONTROLLER, 138 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, SSOP-16 |
| 文件頁數(shù)： | 3/20頁 |
| 文件大小： | 355K |
| 代理商： | LTC1435ACG#TRPBF |
11
LTC1435A
APPLICATIONS INFORMATION
WU
U
control power to be derived from the output during normal
operation (4.8V < VOUT < 9V) and from the internal regu-
lator when the output is out of regulation (start-up, short
circuit). Do not apply greater than 10V to the EXTVCC pin
and ensure that EXTVCC < VIN.
Significant efficiency gains can be realized by powering
INTVCC fromtheoutput,sincetheVINcurrentresultingfrom
the driver and control currents will be scaled by a factor of
Duty Cycle/Efficiency. For 5V regulators this supply means
connecting the EXTVCC pin directly to VOUT. However, for
3.3V and other lower voltage regulators, additional circuitry
is required to derive INTVCC power from the output.
The following list summarizes the four possible connections
for EXTVCC:
1. EXTVCC left open (or grounded). This will cause INTVCC
to be powered from the internal 5V regulator resulting
in an efficiency penalty of up to 10% at high input volt-
ages.
2. EXTVCC connected directly to VOUT. This is the normal
connection for a 5V regulator and provides the highest
efficiency.
3. EXTVCC connected to an output-derived boost network.
For 3.3V and other low voltage regulators, efficiency
gains can still be realized by connecting EXTVCC to an
output-derived voltage which has been boosted to
greater than 4.8V. This can be done with either the in-
ductive boost winding as shown in Figure 4a or the
capacitive charge pump shown in Figure 4b. The charge
pump has the advantage of simple magnetics.
4. EXTVCC connected to an external supply. If an external
supply is available in the 5V to 10V range (EXTVCC≤VIN),
it may be used to power EXTVCC providing it is compat-
ible with the MOSFET gate drive requirements. When
driving standard threshold MOSFETs, the external sup-
ply must always be present during operation to prevent
MOSFET failure due to insufficient gate drive.
Topside MOSFET Driver Supply (CB, DB)
An external bootstrap capacitor CB connected to the Boost
pin supplies the gate drive voltage for the topside MOSFET.
Capacitor CB in the Functional Diagram is charged through
diode DB from INTVCC when the SW pin is low. When the
Figure 4a. Secondary Output Loop and EXTVCC Connection
EXTVCC
VIN
TG
BG
PGND
LTC1435A
N-CH
+
CIN
VIN
+
COUT
L1
RSENSE
VOUT
+
1
F
1435A F04b
VN2222LL
BAT85
0.22
F
SW
Figure 4b. Capacitive Charge Pump for EXTVCC
topside MOSFET is to be turned on, the driver places the
CB voltage across the gate source of the MOSFET. This en-
hances the MOSFET and turns on the topside switch. The
switch node voltage SW rises to VIN and the Boost pin rises
to VIN + INTVCC. The value of the boost capacitor CB needs
to be 100 times greater than the total input capacitance of
the topside MOSFET. In most applications 0.1
F is ad-
equate. The reverse breakdown on DB must be greater than
VIN(MAX).
Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
VV
R
VV
OUT
=+
≥
119
1
2
1
119
.,
.
R6
R5
EXTVCC
SFB
SGND
VIN
TG
BG
PGND
LTC1435A
N-CH
+
CIN
VIN
1N4148
+
1
F
+
COUT
VSEC
L1
1:N
RSENSE
VOUT
OPTIONAL
EXT VCC
CONNECTION
5V
≤ VSEC ≤ 9V
1435A F04a
SW
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| LTC1435ACS#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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 |
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