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參數(shù)資料
| 型號： | LTC3701 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit Universal Bus Driver With 3-State Outputs 48-SSOP -40 to 85 |
| 中文描述： | 2相，低輸入電壓，雙通道降壓DC / DC控制器 |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 250K |
| 代理商： | LTC3701 |
8
LTC3701
3701fa
Dropout Operation
When the input supply voltage decreases towards the
output voltage, the rate of change of the inductor current
during the ON cycle decreases. This reduction means that
the external P-channel MOSFET will remain on for more
than one oscillator cycle if the inductor current has not
ramped up to the threshold set by EAMP on the I
TH
/RUN
pin. Further reduction in input supply voltage will eventu-
ally cause the P-channel MOSFET to be turned on 100%,
i.e., DC. The output voltage will then be determined by the
input voltage minus the voltage drop across the MOSFET,
the sense resistor and the inductor.
Undervoltage Lockout
To prevent operation of the P-channel MOSFET below safe
input voltage levels, an undervoltage lockout is incorpo-
rated into the LTC3701. When the input supply voltage
drops below 2V, the P-channel MOSFET and all circuitry
are turned off except the undervoltage block, which draws
only several microamperes.
Short-Circuit Protection
When an output is shorted to ground (V
FB
< 0.3V), the
switching frequency of that channel is reduced to 1/5 of
the normal operating frequency. The other controller
channel is unaffected and maintains normal operation.
This lower frequency allows the inductor current to safely
discharge, thereby preventing current runaway. The switch-
ing frequency will return to its normal value when the
feedback voltage rises above 0.3V. During the first 64
cycles (nonzero-current cycles) of soft-start, however, the
controller operates at its full frequency.
Output Overvoltage Protection
As a further protection, the overvoltage comparator in the
LTC3701 will turn the external MOSFET off when the
feedback voltage has risen 10% above the reference
voltage of 0.8V. This comparator has a typical hysteresis
of 20mV.
Slope Compensation and Peak Inductor Current
The inductor’s peak current is determined by:
I
V
V
R
PK
ITH RUN
/
10
SENSE
=
–0 7
when the LTC3701 is operating below 20% duty cycle.
However, once the duty cycle exceeds 20%, slope
compensation begins and effectively reduces the peak
inductor current. The amount of reduction is given by the
curve in Figure 2.
OPERATIOU
(Refer to Functional Diagram)
Figure 2. Maximum Peak Current vs Duty Cycle
DUTY CYCLE (%)
10
S
M
60
50
80
70
110
100
90
3701 F02
40
30
20
10
90
0
30
50
70
20
0
40
60
80
100
Power Good (PGOOD) Pin
A window comparator monitors both output voltages and
the open-drain PGOOD output is pulled low when the
divided down output voltages are not within
±
8% of the
reference voltage of 0.8V. PGOOD is pulled low when
channel 1 or both channels are shut down. When chan-
nel2 is shut down and channel 1 enabled, the PGOOD
output indicates the state of channel 1 only.
2-Phase Operation
The LTC3701 dual switching controller offers the consid-
erable benefits of using 2-phase operation. Circuit ben-
efits include lower input filtering requirements, reduced
electromagnetic interference (EMI) and increased effi-
ciency associated with 2-phase operation.
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| LTC3701EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-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(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3701EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-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(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 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:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3701EGNPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Dual Step-Dn 10V SSOP16 |
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