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| 型号： | LTC3617EUDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG SYNC 6A BUCK 24-QFN |
| 标准包装： | 73 |
| 应用： | 转换器，DDR，DDR2，DDR3 |
| 输入电压： | 2.25 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 可调至 0.5V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN（3x5） |
| 包装： | 管件 |
LTC3617
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction
temperature r ange, otherwise specifications are at T A = 25°C. PV IN = SV IN = 3.3V, RT = SV IN unless otherwise specified (Notes 1, 2, 8).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
? V FB(LINEREG) Feedback Voltage Line Regulation
? V FB(LOADREG) Feedback Voltage Load Regulation
SV IN = PV IN = 2.25V to 5.5V,
VDDQIN = 1.5V (Notes 3, 4)
ITH from 0.5V to 0.9V (Notes 3, 4)
V ITH = SV IN (Note 5)
l
0.2
0.25
0.25
%/V
%
%
I Q
R DS(ON)
Input DC Supply Current
Active Mode
Shutdown
Top Switch On-Resistance
Bottom Switch On-Resistance
V FB = 0.6V, VDDQIN = 1.5V (Note 6)
SV IN = PV IN = 5.5V, V RUN = 0V
PV IN = 3.3V
PV IN = 3.3V
1100
0.1
35
25
1
μA
μA
mΩ
mΩ
I LIM
g m(EA)
Top Switch Positive Peak Current Limit
Top Switch Negative Peak Current Limit
Error Amplifier Transconductance
Sourcing (Note 7), V FB = 0.5V
Sinking (Note 7)
–5μA < I ITH < 5μA (Note 4)
8
–12
10
–8
200
14
–5
A
A
μS
I EAO
Error Amplifier Maximum Output Current (Note 4)
±30
μA
t SS
Internal Soft-Start Time
V FB from 0.075V to 0.675V,
VDDQIN = 1.5V
0.4
0.85
2
ms
f OSC
Oscillator Frequency
Internal Oscillator Frequency
R T = 370k
V RT = SV IN
l
l
0.8
1.8
1
2.25
1.2
2.7
MHz
MHz
f SYNC
V SYNC
Synchronization Frequency Range
SYNC Input Threshold High Voltage
SYNC Input Threshold Low Voltage
0.3
1.2
4
0.3
MHz
V
V
I SW(LKG)
Switch Leakage Current
SV IN = PV IN = 5.5V, V RUN = 0V
0.1
1
μA
PGOOD
Power Good Voltage Windows
VDDQIN = 1.5V, Entering Window
V FB Ramping Up
V FB Ramping Down
VDDQIN = 1.5V, Leaving Window
V FB Ramping Up
V FB Ramping Down
–3.5
3.5
–5
5
8
–8
10
–10
%
%
%
%
t PGOOD
R PGOOD
Power Good Blanking Time
Power Good Pull-Down On-Resistance
Entering and Leaving Window
70
8
105
17
140
33
μs
Ω
V RUN
RUN voltage
Input High
Input Low
l
l
1
0.4
V
V
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 LTC3617 is tested under pulsed load conditions such that
T J ?≈?T A . The LTC3617E is guaranteed to meet performance specifications
over the 0°C to 85°C operating junction temperature range. Specifications
over the –40°C to 125°C operating junction temperature range are
assured by design, characterization and correlation with statistical process
controls. The LTC3617I is guaranteed to meet specifications over the
full –40°C to 125°C operating junction temperature range. Note that
the maximum ambient temperature is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
resistance and other environmental factors. The junction temperature
(T J , in °C) is calculated from the ambient temperature (T A , in °C) and
power dissipation (P D , in watts) according to the formula:
Note 3: This parameter is tested in a feedback loop which servos V FB to
the midpoint for the error amplifier (V ITH = 0.75V).
Note 4: External compensation on ITH pin.
Note 5: Tying the ITH pin to SV IN enables the internal compensation.
Note 6: Dynamic supply current is higher due to the internal gate charge
being delivered at the switching frequency.
Note 7: In sourcing mode the average output current is flowing out of the
SW pin. In sinking mode the average output current is flowing into the SW
Pin.
Note 8: 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.
T J = T A + (P D ? θ JA ), where θ JA (in °C/W) is the package thermal
impedance.
3617fa
3
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