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参数资料
型号： LTC2905ITS8#TRMPB
厂商： LINEAR TECHNOLOGY CORP
元件分类： 电源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封装： LEAD FREE, PLASTIC, MO-193, TSOT-23, 8 PIN
文件页数： 10/16页
文件大小： 152K
代理商： LTC2905ITS8#TRMPB
LTC2904/LTC2905
3
29045fb
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. V1 = 2.5V, V2 = 1V, S1 = TOL = V1, S2 = 0V, unless otherwise noted.
(Notes 2, 3)
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 greater of V1, V2 is the internal supply voltage (VCC).
Note 3: All currents into pins are positive; all voltages are referenced to
GND unless otherwise noted.
Note 4: For reset thresholds test conditions refer to the voltage threshold
programming table in the Applications Information section.
Note 5: The output pins RST and RST have an internal pull-up to VCC of
typically –6μA. However, an external pull-up resistor may be used when
faster rise time is required or for VOH voltages greater than VCC.
Note 6: The input current to the three-state input pins are the pull-up and
the pull-down current when the pins are either set to V1 or GND
respectively. In the open state, the maximum leakage current to V1 or GND
permissible is 10μA.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VRT50
5V, 5% Reset Threshold
V1 Input Threshold
●
4.600
4.675
4.750
V
5V, 7.5% Reset Threshold
●
4.475
4.550
4.625
V
5V, 10% Reset Threshold
●
4.350
4.425
4.500
V
VRT33
3.3V, 5% Reset Threshold
V1, V2 Input Threshold
●
3.036
3.086
3.135
V
3.3V, 7.5% Reset Threshold
●
2.954
3.003
3.053
V
3.3V, 10% Reset Threshold
●
2.871
2.921
2.970
V
VRT25
2.5V, 5% Reset Threshold
V1, V2 Input Threshold
●
2.300
2.338
2.375
V
2.5V, 7.5% Reset Threshold
●
2.238
2.275
2.313
V
2.5V, 10% Reset Threshold
●
2.175
2.213
2.250
V
VRT18
1.8V, 5% Reset Threshold
V2 Input Threshold
●
1.656
1.683
1.710
V
1.8V, 7.5% Reset Threshold
●
1.611
1.638
1.665
V
1.8V, 10% Reset Threshold
●
1.566
1.593
1.620
V
VRT15
1.5V, 5% Reset Threshold
V2 Input Threshold
●
1.380
1.403
1.425
V
1.5V, 7.5% Reset Threshold
●
1.343
1.365
1.388
V
1.5V, 10% Reset Threshold
●
1.305
1.328
1.350
V
VRT12
1.2V, 5% Reset Threshold
V2 Input Threshold
●
1.104
1.122
1.140
V
1.2V, 7.5% Reset Threshold
●
1.074
1.092
1.110
V
1.2V, 10% Reset Threshold
●
1.044
1.062
1.080
V
VRT10
1V, 5% Reset Threshold
V2 Input Threshold
●
0.920
0.935
0.950
V
1V, 7.5% Reset Threshold
●
0.895
0.910
0.925
V
1V, 10% Reset Threshold
●
0.870
0.885
0.900
V
VCCMIN
Minimum Internal Operating Voltage (Note 2) RST in Correct Logic State
●
1V
IV1
V1 Input Current
Includes Input Current to Three-State Pins
●
65
130
μA
IV2
V2 Input Current
●
0.4
1.0
μA
ITMR(UP)
TMR Pull-Up Current
(LTC2905)
VTMR = 0V
●
–1.5
–2.1
–2.7
μA
ITMR(DOWN)
TMR Pull-Down Current (LTC2905)
VTMR = 1.4V
●
1.5
2.1
2.7
μA
tRST
Reset Time-Out Period
(LTC2904)
●
140
200
260
ms
tRST
Reset Time-Out Period
(LTC2905)
CTMR = 22nF
●
140
200
260
ms
tUV
Vx Undervoltage Detect to
Vx Less than Reset Threshold VRTX
150
μs
RST or RST
by More than 1%
VOL
Output Voltage Low RST, RST
I = 2.5mA
l
0.15
0.4
V
I = 100μA; V1 = 1V (RST Only)
l
0.05
0.3
V
VOH
Output Voltage High RST, RST
I = –1μAl
VCC–1
V
(Notes 2, 5)
Three-State Inputs S1, S2, TOL
VIL
Low Level Input Voltage
l
0.4
V
VIH
High Level Input Voltage
l
1.4
V
VZ
Pin Voltage when Left in Open State
I = –10μA
l
0.7
V
I = 0μA
0.9
V
I = 10μA
l
1.1
V
IVPG
Programming Input Current (Note 6)
l
±25
μA
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