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参数资料
型号： LTC3521IFE#TRPBF
厂商： LINEAR TECHNOLOGY CORP
元件分类： 稳压器
英文描述： SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, PDSO20
封装： 4.40 MM, LEAD FREE, PLASTIC, TSSOP-20
文件页数： 16/22页
文件大小： 1476K
代理商： LTC3521IFE#TRPBF
LTC3521
3
3521fa
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3521 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3521E is guaranteed to meet performance specifica-
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage
l
1.8
5.5
V
Quiescent Current—Shutdown
VSHDN1 = VSHDN2 = VSHDN3 = 0V (Note 6)
l
0.01
2
A
Burst Mode Quiescent Current
VFB1 = 0.66V, VFB2 = 0.66V, VFB3 = 0.66V, VPWM = 0V
30
A
Oscillator Frequency
l
0.85
1.1
1.35
MHz
SHDN1, SHDN2, SHDN3, PWM Input High Voltage
l
1.4
V
SHDN1, SHDN2, SHDN3, PWM Input Low Voltage
l
0.4
V
Power Good Outputs Low Voltage
IPGOOD1 = IPGOOD2 = IPGOOD3 = 1mA
0.1
0.2
V
Power Good Outputs Leakage Current
VPGOOD1 = VPGOOD2 = VPGOOD3 = 5.5V
0.1
10
A
Buck Converters
PMOS Switch Resistance
0.205
Ω
NMOS Switch Resistance
0.170
Ω
NMOS Switch Leakage Current
VSW2 = VSW3 = 5.5V, VIN = 5.5V
0.1
5
A
PMOS Switch Leakage Current
VSW2 = VSW3 = 0V, VIN = 5.5V
0.1
10
A
Feedback Voltage
(Note 4)
l
0.585
0.6
0.612
V
Feedback Input Current
VFB2 = VFB3 = 0.6V
1
50
nA
PMOS Current Limit
(Note 3)
l
750
1050
mA
Maximum Duty Cycle
VFB2 = VFB3 = 0.55V
l
100
%
Minimum Duty Cycle
VFB2 = VFB3 = 0.66V
l
0
%
PGOOD Threshold
VFB2,3 Falling
–12
–9
–6
%
Power Good Hysteresis
VFB2,3 Returning Good
2
%
Buck-Boost Converter
Output Voltage
l
1.8
5.25
V
PMOS Switch Resistance
0.110
Ω
NMOS Switch Resistance
0.085
Ω
NMOS Switch Leakage Current
VSW1A = VSW1B = 5.5V, VIN = 5.5V
0.1
5
A
PMOS Switch Leakage Current
VSW1A = VSW1B = 0V, VIN = 5.5V
0.1
10
A
Feedback Voltage
(Note 4)
l
0.585
0.6
0.612
V
Feedback Input Current
VFB1 = 0.6V
1
50
nA
Average Current Limit
(Note 3)
l
1.65
2.1
A
Reverse Current Limit
(Note 3)
375
mA
Maximum Duty Cycle
VFB1 = 0.55V
l
85
94
%
Minimum Duty Cycle
VFB1 = 0.66V
l
0
%
PGOOD Threshold
VFB1 Falling
–12
–9
–6
%
Power Good Hysteresis
VFB1 Returning Good
3
%
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN, PVIN1, PVIN2 = 3.6V, VOUT1 = 3.3V, unless
otherwise noted.
tions from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization and
correlation with statistical process controls. The LTC3521I is guaranteed
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.
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