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| 型号： | LTC3603EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2.5A 20QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 14.5 V |
| 输入电压： | 4.5 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 300kHz ~ 3MHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 20-QFN 裸露焊盘（4x4） |
LTC3603
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T A = 25°C. V IN = 12V unless otherwise specified (Note 2).
SYMBOL
PV IN
PARAMETER
Operating Voltage Range
CONDITIONS
MIN
4.5
TYP
MAX
15
UNITS
V
V FB
Regulated Feedback Voltage
ITH = 0.7V (Note 3)
l
0.594
0.6
0.606
V
D V FB(LINEREG)
Feedback Voltage Line Regulation
V IN = 5V to 15V, I TH = 0.7V
0.005
%/V
D V FB(LOADREG)
D V PGOOD
R PGOOD
Feedback Voltage Load Regulation
Power Good Range
Power Good Resistance
ITH = 0.36V to 0.84V
l
0.02
±10
55
0.1
±12
80
%
%
Ω
I FB
g m
FB Input Bias Current
Transconductance Amplifier g m
10
1.7
nA
mS
I S
INTV CC
t ON, MIN
Supply Current
Active Mode
Sleep Mode
Shutdown
V CC LDO Output Voltage
Minimum Controllable ON-Time
(Note 4)
4.7
500
75
0.2
4.9
95
700
100
1
5.1
115
μA
μA
μA
V
ns
V RUN
RUN Pin ON Threshold
V RUN Rising
l
0.4
0.7
1.1
V
I TRACK/SS
TRACK/SS Pull-Up Current
TRACK/SS = 1V
1.25
μA
f OSC
f SYNC
Oscillator Frequency
SYNC Capture Range
R T = 105k
0.85
0.3
1
1.15
3
MHz
MHz
R DS(ON)
Top Switch On-Resistance
Bottom Switch On-Resistance
85
45
m Ω
m Ω
I LIM
I LSW
Peak Current Limit
Switch Leakage Current
3.8
4.5
0.1
5.2
1
A
μA
V UVLO
INTV CC Undervoltage Lockout
INTV CC Ramping Up
l
4.1
4.2
4.3
V
V UVLO, HYS
INTV CC Undervoltage Lockout Hysteresis
700
mV
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 LTC3603 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3603E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3603I is guaranteed over the –40°C to 125°C operating junction
temperature range. Note that the maximum ambient temperature
consistant with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance, and other environmental factors.
Note 3: The LTC3603 is tested in a feedback loop that adjusts V FB to
achieve a specified error amplifier output voltage (I TH ).
Note 4: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 5: T J is calculated from the ambient temperature T A and the power
dissipation as follows: T J = T A + (P D )( θ JA oC/W).
Note 6: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7: This limit indicates the current density limitations of the internal
metallization and it is not tested in production.
3
For more information www.linear.com/LTC3603
3603fc
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