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LT8338 Fiches technique(PDF) 3 Page - Analog Devices

No de pièce LT8338
Description  40V, 1.2A Micropower Synchronous Boost Converter with PassThru
PDF  20 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

LT8338 Fiches technique(HTML) 3 Page - Analog Devices

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LT8338
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. VIN = 12V, VOUT = 36V, CTRL = 2.0V, EN/UVLO = 12V, INTVCC = 2.2µF to
GND, RT = 40.2kΩ to GND, BST = 0.1µF to SW and SYNC/MODE is tied to GND.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN Operating Voltage
l
3.0
40
V
VIN Quiescent Current (Note 5)
EN/UVLO = 0V (Shutdown Mode)
0.1
1
µA
EN/UVLO = 2V, SYNC/MODE = 0V,
Not Switching, VOUT–VIN = +100mV
(Burst Mode Operation)
6
18
µA
EN/UVLO = 2V, SYNC/MODE = 0V,
Not Switching, VOUT–VIN < –100mV
(PassThru Mode)
12
35
µA
EN/UVLO = 2V, SYNC/MODE = 2.6V
(Pulse-Skipping Mode + SSFM)
1200
1500
µA
VOUT Regulation (Note 6)
VIN = 3.3V, CTRL = 0.5V (D = 33.33%)
l
8.8
9.00
9.2
V
VIN = 9V, CTRL = 1.0V (D = 50%)
l
17.8
18.00
18.2
V
VIN = 24V, CTRL = 2.0V (D = 66.67%)
l
35.6
36.00
36.4
V
VOUT Limit Threshold Voltage (Note 6)
l
40.2
41.4
V
VOUT IQ in Shutdown
EN/UVLO = 0V
5
µA
EN/UVLO Threshold Voltage
EN/UVLO Falling
l
0.975
1.000
1.025
V
EN/UVLO Rising Hysteresis
50
mV
EN/UVLO Input Bias Current
EN/UVLO = 2V
–40
40
nA
INTVCC Regulation Voltage
l
2.56
2.6
2.64
V
INTVCC Line Regulation
3V ≤ VIN ≤ 40V
0.02
%/V
INTVCC Load Regulation
1µA ≤ IINTVCC ≤ 10mA
0.04
%/mA
VOUT-to-CTRL Divider Ratio (Note 6)
9V ≤ VOUT ≤ 36V
l
17.85
18.00
18.15
V/V
VOUT Internal Divider Resistance
20
MΩ
CTRL Pin Input Current
–20
20
nA
Switching Frequency
RT = 301k
l
270
300
335
kHz
RT = 80.6k
l
1.05
1.15
1.25
MHz
RT = 40.2k
l
2.00
2.20
2.40
MHz
SYNC Function Input Frequency Range
SYNC/MODE = External Clock
0.3
3.0
MHz
Spread Spectrum Frequency Range
Range = (fSW(SPREAD-ON)/fSW(SPREAD-OFF)-1) • 100% SYNC/MODE = INTVCC
+14
%
Spread Spectrum Modulation Frequency
10
kHz
SYNC Function Input Low Threshold Voltage
SYNC/MODE Pulse Falling
0.8
V
SYNC Function Input High Threshold Voltage
SYNC/MODE Pulse Rising
2.0
V
SYNC/MODE Pin Voltage
SYNC/MODE = Floating
1.3
V



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