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参数资料
| 型号： | LTC1735IS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SOIC |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 335kHz |
| 占空比： | 99.4% |
| 电源电压： | 4 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
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LTC1735
APPLICATIO S I FOR ATIO
V OUT = 0 . 8 V ? 1 + ?
derived from the output or other external source during
normal operation. When the output is out of regulation
(start-up, short circuit) power is supplied from the internal
regulator. Do not apply greater than 7V to the EXTV CC pin
and ensure that EXTV CC ≤ V IN .
Significant efficiency gains can be realized by powering
INTV CC from the output, since the V IN current resulting
from the driver and control currents will be scaled by a
factor of (Duty Cycle)/(Efficiency). For 5V regulators this
simply means connecting the EXTV CC pin directly to V OUT .
Output Voltage Programming
The output voltage is set by an external resistive divider
according to the following formula:
? R 2 ?
? R 1 ?
The resistive divider is connected to the output as shown
in Figure 4 allowing remote voltage sensing.
However, for 3.3V and other lower voltage regulators,
additional circuitry is required to derive INTV CC power
from the output.
OPTIONAL EXTV CC
CONNECTION
5V ≤ V SEC ≤ 7V
V IN
+
C IN
The following list summarizes the four possible connec-
tions for EXTV CC:
1. EXTV CC left open (or grounded). This will cause INTV CC
to be powered from the internal 5.2V regulator resulting in
an efficiency penalty of up to 10% at high input voltages.
R4
LTC1735
EXTV CC
V IN
TG
SW
N-CH
1N4148
L1
1:N
V SEC
6.8V
R SENSE
+
+
1 μ F
V OUT
2. EXTV CC connected directly to V OUT . This is the normal
connection for a 5V output regulator and provides the
highest efficiency. For output voltages higher than 5V,
R3
FCB
SGND
BG
PGND
N-CH
C OUT
1735 F03a
EXTV CC is required to connect to V OUT so the SENSE pins’
absolute maximum ratings are not exceeded.
3. EXTV CC connected to an output-derived boost network.
Figure 3a. Secondary Output Loop and EXTV CC Connection
For 3.3V and other low voltage regulators, efficiency gains
can still be realized by connecting EXTV CC to an output-
derived voltage that has been boosted to greater than
C IN
+
V IN
+
1 μ F
4.7V. This can be done with either the inductive boost
winding as shown in Figure 3a or the capacitive charge
pump shown in Figure 3b. The charge pump has the
advantage of simple magnetics.
4. EXTV CC connected to an external supply. If an external
supply is available in the 5V to 7V range (EXTV CC ≤ V IN ),
such as notebook main 5V system power, it may be used
LTC1735
EXTV CC
V IN
TG
SW
BG
N-CH
N-CH
BAT85
L1
0.22 μ F
VN2222LL
R SENSE
+
BAT85
BAT85
V OUT
C OUT
to power EXTV CC providing it is compatible with the
MOSFET gate drive requirements. This is the typical case
as the 5V power is almost always present and is derived by
PGND
1735 F03b
another high efficiency regulator.
Figure 3b. Capacitive Charge Pump for EXTV CC
1735fc
16
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