LTC1622CMS8 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC1622CMS8' PDF : 16 Pages View PDF
LTC1622
ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V
SYMBOL
PDRV tr
PDRV tf
∆VSENSE(MAX)
PARAMETER
Gate Drive Rise Time
Gate Drive Fall Time
Maximum Current Sense Voltage
CONDITIONS
CLOAD = 3000pF
CLOAD = 3000pF
MIN TYP MAX
80
140
100 140
q 80
110 140
UNITS
ns
ns
mV
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: TJ is calculated from the ambient temperature TA and power
dissipation PD according to the following formula:
LTC1622CS8; TJ = TA + (PD • 150°C/W),
LTC1622CMS8; TJ = TA + (PD • 250°C/W)
Note 3: The LTC1622 is tested in a feedback loop that servos VFB to the
feedback point for the error amplifier (VITH = 0.8V).
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
TYPICAL PERFORMANCE CHARACTERISTICS
Shutdown Current
vs Supply Voltage
45
40
35
30
25
20
15
10
5
0
2345678
SUPPLY VOLTAGE (V)
9 10
1622 G01
Normalized Oscillator Frequency
vs Temperature
10.0
VIN = 4.2V
7.5
5.0
2.5
0
–2.5
–5.0
–7.5
–10.0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1622 G04
RUN/SS Current vs Supply Voltage
3.50
3.00
2.50
2.00
1.50
1.00
234 567 8
SUPPLY VOLTAGE (V)
Reference Voltage
vs Temperature
0.810
VIN = 4.2V
0.805
9 10
1622 G02
0.800
0.795
0.790
0.785
0.780
0.775
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1622 G05
Maximum Current Sense Voltage
vs Duty Cycle
110
VIN = 4.2V
100
90
UNSYNC
80
70
60
50
40
30
20 30 40 50 60 70 80 90 100
DUTY CYCLE (%)
1622 G03
Undervoltage Lockout Voltage
vs Temperature
2.10
2.05
2.00
1.95
1.90
1.85
1.80
1.75
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1622 G06
3
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