参数资料
型号: LTC3890EUH#TRPBF
厂商: Linear Technology
文件页数: 5/40页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 32-QFN
产品培训模块: LTC3890 - 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
标准包装: 2,500
系列: PolyPhase®
PWM 型: 电流模式
输出数: 2
频率 - 最大: 850kHz
占空比: 99%
电源电压: 4 V ~ 60 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 32-WFQFN 裸露焊盘
包装: 带卷 (TR)
LTC3890
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency and Power Loss
vs Output Current
Efficiency vs Output Current
Efficiency vs Input Voltage
V IN = 12V
100
90 V OUT = 3.3V
80
BURST EFFICIENCY
10000
1000
100
90
80
V OUT = 8.5 V
V OUT = 3.3V
100
98
96
V OUT2 = 8.5V
70
60
CCM LOSS
100
70
60
94
92
50
40
PULSE-SKIPPING
LOSS
BURST LOSS
10
50
40
90
88
V OUT1 = 3.3V
30
30
86
V IN = 12V
20
10
0
0.0001
0.001
0.01
CCM EFFICIENCY
PULSE-SKIPPING
EFFICIENCY
0.1 1
1
0.1
10
20
Burst Mode OPERATION
10
0
0.0001 0.001 0.01
0.1 1
10
84
82
80
0
I LOAD = 2A
5 10 15 20 25 30 35 40 45 50 55 60
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
INPUT VOLTAGE (V)
FIGURE 13 CIRCUIT
3890 G01
FIGURE 13 CIRCUIT
3890 G02
FIGURE 13 CIRCUIT
3890 G03
V OUT
100mV/DIV
AC-
COUPLED
I L
2A/DIV
Load Step
Burst Mode Operation
V OUT
100mV/DIV
AC-
COUPLED
I L
2A/DIV
Load Step
Pulse-Skipping Mode
V OUT
100mV/DIV
AC-
COUPLED
I L
2A/DIV
Load Step
Forced Continuous Mode
50μs/DIV
3890 G04
50μs/DIV
3890 G05
50μs/DIV
3890 G06
V IN = 12V
V OUT = 3.3V
FIGURE 13 CIRCUIT
Inductor Current at Light Load
FORCED
CONTINUOUS
MODE
Burst Mode
OPERATION
1A/DIV
PULSE-SKIPPING
MODE
V IN = 12V
V OUT = 3.3V
FIGURE 13 CIRCUIT
Soft Start-Up
V OUT2
2V/DIV
V OUT1
2V/DIV
V IN = 12V
V OUT = 3.3V
FIGURE 13 CIRCUIT
Tracking Start-Up
V OUT2
2V/DIV
V OUT1
2V/DIV
5μs/DIV
3890 G07
2ms/DIV
3890 G08
2ms/DIV
3890 G09
V IN = 12V
V OUT = 3.3V
I LOAD = 200μA
FIGURE 13 CIRCUIT
FIGURE 13 CIRCUIT
3890fc
5
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