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| 型号： | LTC3802EUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 32-QFN |
| 标准包装： | 73 |
| 系列： | PolyPhase® |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 30 V |
| 降压： | 是 |
| 升压： | 无 |
| 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： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3802
APPLICATIO S I FOR ATIO
V OUT1
L1
LFF
SAW1
SAW2
LFF
L2
V OUT2
R T4
R41
R11
+
C OUT1
AND
PWM
RUN/SS
7 μ A
AND
PWM
C OUT2
+
R12
R42
EXTREF
REF
+
CH1
DUTY CYCLE
CONTROL
1.7V
PHASEMD
+
–
14 μ A
C SS
CH2
DUTY CYCLE
CONTROL
+
EXTREF
REF
–
POWER-UP/-DOWN OUTPUTS
–
R T5
R51
R B1
R B2
R52
CMPIN1
FBT
V OUT1 MUST BE HIGHER THAN V OUT2
R11 = R41 = R T4 = R12 = R42
R B1 = R51, R B2 = R52
TRACK
– +
CMPIN2
3802 F04
RATIOMETRIC TRACKING
R T5 = R51
C SS = 1 μ F
V OUT1 WITH
10 ? LOAD
COINCIDENT TRACKING
R T5 = R52
C SS = 1 μ F
V OUT1 WITH
10 ? LOAD
0.5V/DIV
V OUT2 WITH
10 ? LOAD
10ms/DIV
0.5V/DIV
V OUT2 WITH
10 ? LOAD
10ms/DIV
Figure 4. Simplified Power-Up/Power-Down Output Tracking Schematic
The QFN version of the LTC3802 provides an additional
reference pin for external ratiometric start-up. If the poten-
tial at the EXTREF pin is less than 0.6V, it overrides the
internal reference. This pin can be connected to an external
ramp to control the output slew rate. If external tracking is
not required, connect EXTREF to a potential somewhat
larger than 0.6V or short EXTREF to the RUN/SS pin. The
EXTREF pin should never be allowed to float. In the GN28
package, EXTREF is internally shorted to the RUN/SS pin.
Burst Mode Operation
The LTC3802 switcher supply has two modes of opera-
tion. Under heavy loads, it operates as a fully synchro-
nous, continuous conduction switching regulator. In this
mode of operation (continuous mode), the current in the
inductor flows in the positive direction (towards the out-
put) during the entire switching cycle, constantly supply-
switch (QB) is on whenever QT is off, so the current always
flows through a low impedance switch, minimizing volt-
age drop and power loss. This is the most efficient mode
of operation at heavy loads, where the resistive losses in
the power devices are the dominant loss term.
Continuous mode works efficiently when the load current
is greater than half of the ripple current in the inductor. In
a buck converter like the LTC3802, the average current in
the inductor (averaged over one switching cycle) is equal
to the load current. The ripple current is the difference
between the maximum and the minimum current during
a switching cycle (see Figure 5a). The ripple current
depends on inductor value, clock frequency and output
voltage, but is constant regardless of load as long as the
LTC3802 remains in continuous mode. See the Inductor
Selection section for a detailed description of ripple
current.
ing current to the load. In this mode, the synchronous
3802f
18
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