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參數(shù)資料
| 型號： | LTC1629C-PG |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Dual LinCMOS(TM) Timer 14-SOIC |
| 中文描述： | 多相，高效率同步降壓型開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 11/28頁 |
| 文件大?。?/td> | 330K |
| 代理商： | LTC1629C-PG |
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11
LTC1629/LTC1629-PG
OPERATIOU
INTV
CC
/EXTV
CC
Power
Power for the top and bottom MOSFET drivers and most
of the IC circuitry is derived from INTV
CC
. When the
EXTV
CC
pin is left open, an internal 5V low dropout
regulator supplies INTV
CC
power. If the EXTV
CC
pin is
taken above 4.7V, the 5V regulator is turned off and an
internal switch is turned on connecting EXTV
CC
to INTV
CC
.
This allows the INTV
CC
power to be derived from a high
efficiency external source such as the output of the regu-
lator itself or a secondary winding, as described in the
Applications Information section. An external Schottky
diode can be used to minimize the voltage drop from
EXTV
CC
to INTV
CC
in applications requiring greater than
the specified INTV
CC
current. Voltages up to 7V can be
applied to EXTV
CC
for additional gate drive capability.
(Refer to Functional Diagram)
Differential Amplifier
This amplifier provides true differential output voltage
sensing. Sensing both V
OUT+
and V
OUT–
benefits regula-
tion in high current applications and/or applications hav-
ing electrical interconnection losses. The AMPMD pin
(available on the LTC1629 only) allows selection of inter-
nal precision feedback resistors for high common mode
rejection differencing applications, or direct access to the
actual amplifier inputs without these internal feedback
resistors for other applications. The AMPMD pin is
grounded to connect the internal precision resistors in a
unity-gain differencing application or tied to the INTV
CC
pin to bypass the internal resistors and make the amplifier
inputs directly available. The amplifier is a unity-gain
stable, 2MHz gain-bandwidth, >120dB open-loop gain
design. The amplifier has an output slew rate of 5V/
μ
s and
is capable of driving capacitive loads with an output RMS
current typically up to 25mA. The amplifier is not capable
of sinking current and therefore must be resistively loaded
to do so. The differential amplifier is configured as a unity-
gain differencing amplifier in the LTC1629-PG.
Power Good (PGOOD) (LTC1629-PG Only)
The PGOOD pin is connected to the drain of an internal
MOSFET. The MOSFET turns on when the output is not
within
±
7.5% of its nominal output level as determined by
the feedback divider. When the output is within
±
7.5% of
its nominal value, the MOSFET is turned off within 10
μ
s
and the PGOOD pin should be pulled up by an external
resistor to a source of up to 7V.
Short-Circuit Detection
The RUN/SS capacitor is used initially to limit the inrush
current from the input power source. Once the controllers
have been given time, as determined by the capacitor on
the RUN/SS pin, to charge up the output capacitors and
provide full load current, the RUN/SS capacitor is then
used as a short-circuit timeout circuit. If the output voltage
falls to less than 70% of its nominal output voltage the
RUN/SS capacitor begins discharging assuming that the
output is in a severe overcurrent and/or short-circuit
condition. If the condition lasts for a long enough period
as determined by the size of the RUN/SS capacitor, the
controller will be shut down until the RUN/SS pin voltage
is recycled. This built-in latchoff can be overidden by
providing a >5
μ
A pull-up current at a compliance of 5V to
the RUN/SS pin. This current shortens the soft-start
period but also prevents net discharge of the RUN/SS
capacitor during a severe overcurrent and/or short-circuit
condition. Foldback current limiting is activated when the
output voltage falls below 70% of its nominal level whether
or not the short-circuit latchoff circuit is enabled.
APPLICATIU
The basic LTC1629 application circuit is shown in Figure1
on the first page. External component selection is driven
by the load requirement, and begins with the selection of
R
SENSE1, 2
. Once R
SENSE1, 2
are known, L1 and L2 can be
chosen. Next, the power MOSFETs and D1 and D2 are
selected. The operating frequency and the inductor are
chosen based mainly on the amount of ripple current.
W
U
U
Finally, C
IN
is selected for its ability to handle the input
ripple current (that PolyPhase operation minimizes) and
C
OUT
is chosen with low enough ESR to meet the output
ripple voltage and load step specifications (also minimized
with PolyPhase). The circuit shown in Figure1 can be
configured for operation up to an input voltage of 28V
(limited by the external MOSFETs).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1629CG | Dual LinCMOS(TM) Timer 14-SOIC |
| LTC1629I | Dual LinCMOS(TM) Timer 14-PDIP |
| LTC1629IG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1629IG-PG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC1642IGN | Hot Swap Controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1629EG-6 | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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 |
| LTC1629EG-6#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 標準包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 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:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
| LTC1629EG-6#TR | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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 |
| LTC1629EG-6#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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 |
| LTC1629IG | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:PolyPhase® 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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