参数资料
型号: LTC3826IUH#PBF
厂商: Linear Technology
文件页数: 20/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32-QFN
标准包装: 73
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 585kHz
占空比: 99.4%
电源电压: 4 V ~ 36 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 85°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 管件
LTC3826
APPLICATIONS INFORMATION
The LTC3826 will regulate the V FB pin (and hence V OUT )
V x V OUT
according to the voltage on the TRACK/SS pin, allowing
V OUT to rise smoothly from 0V to its ?nal regulated value.
The total soft-start time will be approximately:
RB
RA
1/2 LTC3826
V FB
t SS = C SS ?
0.8 V
1 μA
R TRACKB
R TRACKA
TRACK/SS
3826 F07
Alternatively, the TRACK/SS pin can be used to track two
(or more) supplies during start-up, as shown qualitatively
in Figures 6a and 6b. To do this, a resistor divider should
be connected from the master supply (V X ) to the TRACK/
SS pin of the slave supply (V OUT ), as shown in Figure 7.
Figure 7. Using the TRACK/SS Pin for Tracking
During start-up V OUT will track V X according to the ratio
set by the resistor divider:
? TRACKA TRACKB
V X
V OUT
=
R A
R TRACKA
R + R
R A + R B
V X (MASTER)
For coincident tracking (V OUT = V X during start-up),
R A = R TRACKA
R B = R TRACKB
V OUT (SLAVE)
INTV CC Regulators
The LTC3826 features two separate internal P-channel low
dropout linear regulators (LDO) that supply power at the
TIME
3826 F06a
INTV CC pin from either the V IN supply pin or the EXTV CC
(6a) Coincident Tracking
V X (MASTER)
V OUT (SLAVE)
TIME 3826 F06b
(6b) Ratiometric Tracking
Figure 6. Two Different Modes of Output Voltage Tracking
pin, respectively, depending on the connection of the
EXTV CC pin. INTV CC powers the gate drivers and much of
the LTC3826’s internal circuitry. The V IN LDO regulates
the voltage at the INTV CC pin to 5.25V and the EXTV CC
LDO regulates it to 7.5V. Each of these can supply a peak
current of 50mA and must be bypassed to ground with a
minimum of 4.7μF ceramic capacitor. The ceramic capacitor
placed directly adjacent to the INTV CC and PGND IC pins is
highly recommended. Good bypassing is needed to supply
the high transient currents required by the MOSFET gate
drivers and to prevent interaction between the channels.
High input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the maxi-
mum junction temperature rating for the LTC3826 to be
exceeded. The INTV CC current, which is dominated by the
3826fc
20
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