LTC1555C Просмотр технического описания (PDF) - Linear Technology
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LTC1555C Datasheet PDF : 12 Pages
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LTC1555/LTC1556
ELECTRICAL CHARACTERISTICS
VIN = 2.7V to 10V, DVCC = 1.8V to 5.5V, controller digital pins tied to DVCC, SIM digital pins floating, EN, FB pins tied to GND
(LTC1556), C1 = 0.1µF, COUT = 10µF unless otherwise specified.
PARAMETER
CONDITIONS
VCC Short-Circuit Current
Auxiliary LDO VOUT (VLDO)
Auxiliary Switch Resistance
FB Input Resistance
VCC Shorted to GND
EN = High, VCC = 5V, FB = LDO, ILDO = 5mA (LTC1556)
EN = High, VCC = 5V, FB = GND (LTC1556)
(LTC1556)
Charge Pump fOSC
Controller Inputs/Outputs, DVCC = 3V
Input Current (IIH, IIL)
M0, M1, SS, RIN, CIN
DDRV, EN
High Level Input Current (IIH)
Low Level Input Current (IIL)
High Input Voltage Threshold (VIH)
DATA
DATA
M0, M1, RIN, CIN, DDRV, EN
DATA
Low Input Voltage Threshold (VIL)
M0, M1, RIN, CIN, DDRV, EN
DATA
High Level Output Voltage (VOH)
Low Level Output Voltage (VOL)
DATA Pull-up Resistance
DATA Output Rise/Fall Time
DATA Source Current = 20µA, I/O = VCC
DATA Sink Current = – 200µA, I/O = 0V (Note 3)
Between DATA and DVCC
DATA Loaded with 30pF
SIM Inputs/Outputs, DVCC = 3V, VCC = 3V or 5V
I/O High Input Voltage Threshold (VIH) IIH(MAX) = ±20µA
I/O Low Input Voltage Threshold (VIL) IIL(MAX) = 1mA
High Level Output Voltage (VOH)
I/O, Source Current = 20µA, DATA or DDRV = DVCC
RST, CLK, Source Current = 20µA
Low Level Output Voltage (VOL)
I/O, Sink Current = – 1mA, DATA or DDRV = 0V (Note 3)
RST, CLK, Sink Current = – 200µA
I/O Pull-Up Resistance
Between I/O and VCC
SIM Timing Parameters, DVCC = 3V, VCC = 5V
CLK Rise/Fall Time
CLK Loaded with 30pF
RST, I/O Rise/Fall Time
RST, I/O Loaded with 30pF
CLK Frequency
CLK Loaded with 30pF
VCC Turn-On Time
VCC Discharge Time to 1V
SS = DVCC, COUT = 10µF, IVCC = 0
SS = 0V, COUT = 10µF, IVCC = 0
IVCC = 0, VCC = 5V, COUT = 10µF
MIN
TYP
MAX
UNITS
q
12.5
40
mA
q 4.00
4.3
4.55
V
q
18
30
Ω
200
kΩ
q 500
650
800
kHz
q –1
q –5
1
µA
5
µA
q – 20
20
µA
q
1
mA
q
q
q 0.2 × DVCC
q 0.4
0.7 × DVCC
V
DVCC – 0.6
V
V
V
q 0.7 × DVCC
q
V
0.4
V
q
13
20
28
kΩ
q
1.3
2
µs
q
0.5 × VCC 0.7 × VCC
V
q 0.4
V
q 0.8 × VCC
q 0.9 × VCC
q
q
V
V
0.4
V
0.4
V
q 6.5
10
14
kΩ
q
18
ns
q
1
µs
q
5
MHz
1
ms
6
ms
3
ms
The q denotes specifications which apply over the specified temperature
range.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: C grade device specifications are guaranteed over the 0°C to 70°C
temperature range. In addition, C grade device specifications are assured
over the – 40°C to 85°C temperature range by design or correlation, but
are not production tested.
Note 3: The DATA and I/O pull-down drivers must also sink current
sourced by the internal pull-up resistors.
3
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