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LT8640 Datasheet(PDF) 3 Page - Analog Devices

Part # LT8640
Description  42V, 5A/8A Peak Synchronous Step-Down Silent Switcher with 2.5關A Quiescent Current
PDF  28 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LT8640 Datasheet(HTML) 3 Page - Analog Devices

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LT8640A
3
Rev. 0
For more information www.analog.com
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Minimum Input Voltage
l
2.9
3.4
V
VIN Quiescent Current In Shutdown
VEN/UV = 0V, VIN = 12V
l
0.75
0.75
3
10
µA
µA
VIN Quiescent Current In Sleep
VEN/UV = 2V, Not Switching, VSYNC = 0V, VIN = 6V
l
1.7
1.7
4
10
µA
µA
LT8640A Feedback Reference Voltage
VIN = 6V, ILOAD = 0.5A
VIN = 6V, ILOAD = 0.5A
l
0.964
0.958
0.970
0.970
0.976
0.982
V
V
LT8640A-3.3 Output Reference Voltage
VIN = 6V, ILOAD = 0.5A
VIN = 6V, ILOAD = 0.5A
l
3.28
3.25
3.3
3.3
3.32
3.35
V
V
Reference Voltage Line Regulation
VIN = 4.0V to 36V
l
0.004
0.02
%/V
LT8640A Feedback Pin Input Current
VFB = 1V
–20
20
nA
BIAS Pin Current Consumption
VBIAS = 3.3V, fSW = 2MHz
11
mA
Minimum On-Time
ILOAD = 1.5A, SYNC = 0V
ILOAD = 1.5A, SYNC = 2V
l
l
35
30
50
50
ns
ns
Minimum Off-Time
80
110
ns
Oscillator Frequency
RT = 221k
RT = 60.4k
RT = 18.2k
l
l
l
180
665
1.8
210
700
1.95
240
735
2.1
kHz
kHz
MHz
Top Power NMOS On-Resistance
ISW = 1A
67
mΩ
Top Power NMOS Current Limit
l
9
12
15
A
Bottom Power NMOS On-Resistance
VINTVCC = 3.4V, ISW = 1A
28
mΩ
SW Leakage Current
VIN = 42V, VSW = 0V, 42V
–3
3
µA
EN/UV Pin Threshold
EN/UV Rising
l
0.94
1.0
1.06
V
EN/UV Pin Hysteresis
40
mV
EN/UV Pin Current
VEN/UV = 2V
–20
20
nA
PG Upper Threshold Offset from VFB or VOUT VFB or VOUT Falling
l
5
7.5
10.25
%
PG Lower Threshold Offset from VFB or VOUT VFB or VOUT Rising
l
–10.75
–8
–5.25
%
PG Hysteresis
0.3
%
PG Leakage
VPG = 3.3V
–40
40
nA
PG Pull-Down Resistance
VPG = 0.1V
l
700
2000
Ω
SYNC/MODE Threshold
SYNC/MODE DC and Clock Low Level Voltage
SYNC/MODE Clock High Level Voltage
SYNC/MODE DC High Level Voltage
l
l
l
0.7
2.2
1.5
2.9
V
V
V



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