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參數(shù)資料
| 型號(hào)： | LTC3728LZEUH |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 5 X 5 MM, PLASTIC, MO-220WHHD, QFN-28 |
| 文件頁數(shù)： | 9/32頁 |
| 文件大?。?/td> | 467K |
| 代理商： | LTC3728LZEUH |
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LTC3728LZ
17
3728lzf
cost. Other capacitor types include Nichicon PL series,
Panasonic SP, NEC Neocap, Cornell Dubilier ESRE and
Sprague 595D series. Consult manufacturers for other
specic recommendations.
INTVCC Regulator
An internal P-channel low dropout regulator produces 5V
at the INTVCC pin from the VIN supply pin. INTVCC powers
the drivers and internal circuitry within the IC. The INTVCC
pin regulator can supply a peak current of 50mA and must
be bypassed to ground with a minimum of 4.7μF tantalum,
10μF special polymer, or low ESR type electrolytic capaci-
tor. A 1μF ceramic capacitor placed directly adjacent to the
INTVCC and PGND IC pins is highly recommended. Good
bypassing is necessary to supply the high transient cur-
rents required by the MOSFET gate drivers and to prevent
interaction between channels.
Higher input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the maxi-
mum junction temperature rating for the IC to be exceeded.
The system supply current is normally dominated by the
gate charge current. Additional external loading of the
INTVCC regulator also needs to be taken into account for
the power dissipation calculations. The total INTVCCcurrent
can be supplied by either the 5V internal linear regulator
or by the EXTVCC input pin. When the voltage applied to
the EXTVCC pin is less than 4.7V, all of the INTVCC current
is supplied by the internal 5V linear regulator. Power dis-
sipation for the IC in this case is highest: (VIN)(IINTVCC),
and overall efciency is lowered. The gate charge current
is dependent on operating frequency as discussed in the
Efciency Considerations section. The junction temperature
can be estimated by using the equations given in Note 2
of the Electrical Characteristics. For example, the IC VIN
current is thermally limited to less than 67mA from a 24V
supply when not using the EXTVCC pin as follows:
TJ = 70°C + (67mA)(24V)(34°C/W) = 125°C
Use of the EXTVCC input pin reduces the junction
temperature to:
TJ = 70°C + (67mA)(5V)(34°C/W) = 81°C
The absolute maximum rating for the INTVCC Pin is 40mA.
To prevent maximum junction temperature from being
exceeded, the input supply current must be checked
operating in continuous mode at maximum VIN.
EXTVCC Connection
The IC contains an internal P-channel MOSFET switch
connected between the EXTVCC and INTVCC pins. When
the voltage applied to EXTVCC rises above 4.7V, the internal
regulator is turned off and the switch closes, connecting
the EXTVCC pin to the INTVCC pin thereby supplying internal
power. The switch remains closed as long as the voltage
applied to EXTVCC remains above 4.5V. This allows the
MOSFET driver and control power to be derived from the
output during normal operation (4.7V < VOUT < 7V) and
from the internal regulator when the output is out of regu-
lation (start-up, short-circuit). If more current is required
through the EXTVCC switch than is specied, an external
Schottky diode can be added between the EXTVCC and
INTVCC pins. Do not apply greater than 7V to the EXTVCC
pin and ensure that EXTVCC ≤ VIN.
Signicant efciency gains can be realized by powering
INTVCC from the output, since the VIN current resulting
from the driver and control currents will be scaled by a
factor of (Duty Cycle)/(Efciency). 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 connec-
tions for EXTVCC:
1. EXTVCC Left Open (or Grounded). This will cause INTVCC
to be powered from the internal 5V regulator resulting in an
efciency penalty of up to 10% at high input voltages.
2. EXTVCC Connected directly to VOUT. This is the normal
connection for a 5V regulator and provides the highest
efciency.
3. EXTVCC Connected to an External supply. If an external
supply is available in the 5V to 7V range, it may be used to
power EXTVCC providing it is compatible with the MOSFET
gate drive requirements.
APPLICATIONS INFORMATION
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| LTC3728LZEUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN 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(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 |
| LTC3728LZEUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN 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(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 |
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