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LTC1622CS8 数据表(PDF) 3 Page - Linear Technology

部件名 LTC1622CS8
功能描述  Low Input Voltage Current Mode Step-Down DC/DC Controller
PDF  16 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LTC1622CS8 数据表(HTML) 3 Page - Linear Technology

  LTC1622CS8 Datasheet HTML 1Page - Linear Technology LTC1622CS8 Datasheet HTML 2Page - Linear Technology LTC1622CS8 Datasheet HTML 3Page - Linear Technology LTC1622CS8 Datasheet HTML 4Page - Linear Technology LTC1622CS8 Datasheet HTML 5Page - Linear Technology LTC1622CS8 Datasheet HTML 6Page - Linear Technology LTC1622CS8 Datasheet HTML 7Page - Linear Technology LTC1622CS8 Datasheet HTML 8Page - Linear Technology LTC1622CS8 Datasheet HTML 9Page - Linear Technology Next Button
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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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