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LTC1622CS8 데이터시트(PDF) 3 Page - Linear Technology

부품명 LTC1622CS8
상세설명  Low Input Voltage Current Mode Step-Down DC/DC Controller
PDF  16 Pages
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제조업체  LINER [Linear Technology]
홈페이지  http://www.linear.com
Logo LINER - Linear Technology

LTC1622CS8 데이터시트(HTML) 3 Page - Linear Technology

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LTC1622
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
PDRV tr
Gate Drive Rise Time
CLOAD = 3000pF
80
140
ns
PDRV tf
Gate Drive Fall Time
CLOAD = 3000pF
100
140
ns
∆VSENSE(MAX)
Maximum Current Sense Voltage
q
80
110
140
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
SUPPLY VOLTAGE (V)
23
10
1622 G01
45
67
89
45
40
35
30
25
20
15
10
5
0
DUTY CYCLE (%)
20
30
100
1622 G03
40
50
60
70
80
90
110
100
90
80
70
60
50
40
30
VIN = 4.2V
UNSYNC
TEMPERATURE (
°C)
–55 –35
125
1622 G06
–15
5
25
45
65
85 105
2.10
2.05
2.00
1.95
1.90
1.85
1.80
1.75
RUN/SS Current vs Supply Voltage
SUPPLY VOLTAGE (V)
2
8
1622 G02
46
10
3.50
3.00
2.50
2.00
1.50
1.00
3579
TEMPERATURE (
°C)
–55 –35
125
1622 G05
–15
5
25
45
65
85 105
0.810
0.805
0.800
0.795
0.790
0.785
0.780
0.775
VIN = 4.2V
Shutdown Current
vs Supply Voltage
Maximum Current Sense Voltage
vs Duty Cycle
Undervoltage Lockout Voltage
vs Temperature
Reference Voltage
vs Temperature
TEMPERATURE (
°C)
–55 –35
125
1622 G04
–15
5
25
45
65
85 105
10.0
7.5
5.0
2.5
0
–2.5
–5.0
–7.5
–10.0
VIN = 4.2V
Normalized Oscillator Frequency
vs Temperature
The q denotes specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 4.2V



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