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参数资料
| 型号： | LTC1876EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 19/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 36-SSOP |
| 标准包装： | 37 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 3 |
| 频率 - 最大： | 360kHz |
| 占空比： | 99.4% |
| 电源电压： | 3.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 是 |
| 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： | 36-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1333 (CN2011-ZH PDF) |
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LTC1876
APPLICATIO S I FOR ATIO
operating frequency as discussed in the Efficiency Consid-
erations section. The junction temperature can be esti-
mated by using the equations given in Note 3 of the
Electrical Characteristics. For example, the LTC1876 V IN
current is limited to less than 24mA from a 24V supply
when not using the EXTV CC pin as follows:
T J = 70 ° C + (24mA)(24V)(95 ° C/W) = 125 ° C
Use of the EXTV CC input pin reduces the junction tempera-
ture to:
T J = 70 ° C + (24mA)(5V)(95 ° C/W) = 81 ° C
Dissipation should be calculated and added for current
drawn from the internal 3.3V linear regulator. To prevent
maximum junction temperature from being exceeded, the
input supply current must be checked operating in con-
tinuous mode at maximum V IN .
EXTV CC Connection
The LTC1876 contains an internal P-channel MOSFET
switch connected between the EXTV CC and INTV CC pins.
When the voltage applied to EXTV CC rises above 4.7V, the
internal regulator is turned off and the switch closes,
connecting the EXTV CC pin to the INTV CC pin thereby
supplying internal power. The switch remains closed as
long as the voltage applied to EXTV CC remains above 4.5V.
This allows the MOSFET driver and control power to be
derived from the output during normal operation (4.7V <
The following list summarizes the four possible connec-
tions for EXTV CC . Make sure the voltage applied to the
EXTV CC does not exceed 7V.
1. EXTV CC Left Open (or Grounded). This will cause INTV CC
to be powered from the internal 5V regulator resulting in
an efficiency penalty of up to 10% at high input voltages.
2. EXTV CC Connected directly to V OUT . This is the normal
connection for a 5V regulator and provides the highest
efficiency.
3. EXTV CC Connected to the output of the boost regulator.
If the LTC1876 auxillary boost regulator is set up for
output voltage between 4.7V and 7V, the EXTV CC can be
connected to this output.
4. EXTV CC Connected to an Output-Derived Boost Net-
work. 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 4.7V. This can be done with either the inductive boost
winding as shown in Figure 6a or the capacitive charge
pump shown in Figure 6b. The charge pump has the
advantage of simple magnetics.
5. EXTV CC Connected to an External supply. If an external
supply is available in the 5V to 7V range, it may be used to
power EXTV CC providing it is compatible with the MOSFET
gate drive requirements.
V OUT < 7V) and from the internal regulator when the output
is out of regulation (start-up, short-circuit). If more cur-
rent is required through the EXTV CC switch than is speci-
fied, an external Schottky diode can be added between the
OPTIONAL EXTV CC
CONNECTION
5V < V SEC < 7V
V IN
+
C IN
EXTV CC and INTV CC pins. Do not apply greater than 7V to
the EXTV CC pin and ensure that EXTV CC < V IN .
LTC1876
V IN
TG1
N-CH
V SEC
+
1 μ F
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
R6
EXTV CC
SW
T1
1:N
R SENSE
+
V OUT
factor of ((Duty Cycle)/efficiency). For 5V regulators this
supply means connecting the EXTV CC pin directly to V OUT .
However, for 3.3V and other lower voltage regulators,
additional circuitry is required to derive INTV CC power
R5
FCB
SGND
BG1
PGND
N-CH
C OUT
1876 F06a
from the output.
Figure 6a. Secondary Output Loop and EXTV CC Connection
1876fa
19
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