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| 型号： | LTC3521IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BST SYNC ADJ 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 0.6 V ~ 5.5 V，1.8 V ~ 5.25 V |
| 输入电压： | 1.8 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.1MHz |
| 电流 - 输出： | 600mA，1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3521
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T A = 25°C (Note 2). V IN , PV IN1 , PV IN2 = 3.6V, V OUT1 = 3.3V, unless
otherwise noted.
PARAMETER
Input Voltage
Quiescent Current—Shutdown
Burst Mode Quiescent Current
CONDITIONS
V SHDN1 = V SHDN2 = V SHDN3 = 0V (Note 6)
V FB1 = 0.66V, V FB2 = 0.66V, V FB3 = 0.66V, V PWM = 0V
l
l
MIN
1.8
TYP
0.01
30
MAX
5.5
2
UNITS
V
μA
μA
Oscillator Frequency
l
0.85
1.1
1.35
MHz
SHDN1 , SHDN2 , SHDN3 , PWM Input High Voltage
SHDN1 , SHDN2 , SHDN3 , PWM Input Low Voltage
l
l
1.4
0.4
V
V
Power Good Outputs Low Voltage
Power Good Outputs Leakage Current
I PGOOD1 = I PGOOD2 = I PGOOD3 = 1mA
V PGOOD1 = V PGOOD2 = V PGOOD3 = 5.5V
0.1
0.1
0.2
10
V
μA
Buck Converters
PMOS Switch Resistance
NMOS Switch Resistance
0.205
0.170
Ω
Ω
NMOS Switch Leakage Current
PMOS Switch Leakage Current
V SW2 = V SW3 = 5.5V, V IN = 5.5V
V SW2 = V SW3 = 0V, V IN = 5.5V
0.1
0.1
5
10
μA
μA
Feedback Voltage
Feedback Input Current
PMOS Current Limit
(Note 4)
V FB2 = V FB3 = 0.6V
(Note 3)
l
l
0.585
750
0.6
1
1050
0.612
50
V
nA
mA
Maximum Duty Cycle
Minimum Duty Cycle
V FB2 = V FB3 = 0.55V
V FB2 = V FB3 = 0.66V
l
l
100
0
%
%
PGOOD Threshold
Power Good Hysteresis
V FB2,3 Falling
V FB2,3 Returning Good
–12
–9
2
–6
%
%
Buck-Boost Converter
Output Voltage
PMOS Switch Resistance
NMOS Switch Resistance
l
1.8
0.110
0.085
5.25
V
Ω
Ω
NMOS Switch Leakage Current
PMOS Switch Leakage Current
V SW1A = V SW1B = 5.5V, V IN = 5.5V
V SW1A = V SW1B = 0V, V IN = 5.5V
0.1
0.1
5
10
μA
μA
Feedback Voltage
Feedback Input Current
Average Current Limit
(Note 4)
V FB1 = 0.6V
(Note 3)
l
l
0.585
1.65
0.6
1
2.1
0.612
50
V
nA
A
Reverse Current Limit
(Note 3)
375
mA
Maximum Duty Cycle
Minimum Duty Cycle
V FB1 = 0.55V
V FB1 = 0.66V
l
l
85
94
0
%
%
PGOOD Threshold
Power Good Hysteresis
V FB1 Falling
V FB1 Returning Good
–12
–9
3
–6
%
%
Note 2: The LTC3521 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3521E is guaranteed to meet performance specifica-
3
Note 1: Stresses beyond those listed under Absolute Maximum Ratings tions from 0°C to 85°C. Specifications over the –40°C to 125°C operating
may cause permanent damage to the device. Exposure to any Absolute junction temperature range are assured by design, characterization and
Maximum Rating condition for extended periods may affect device correlation with statistical process controls. The LTC3521I is guaranteed
reliability and lifetime. over the full –40°C to 125°C operating junction temperature range. The
maximum ambient temperature is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance and other environmental factors.
3521fb
For more information www.linear.com/LTC3521
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