LT8705 Просмотр технического описания (PDF) - Linear Technology
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LT8705 Datasheet PDF : 44 Pages
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LT8705
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT8705EUHF#PBF
LT8705EUHF#TRPBF
8705
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LT8705IUHF#PBF
LT8705IUHF#TRPBF
8705
38-Lead (5mm × 7mm) Plastic QFN
–40°C to 125°C
LT8705EFE#PBF
LT8705EFE#TRPBF
LT8705FE
38-Lead Plastic TSSOP
–40°C to 125°C
LT8705IFE#PBF
LT8705IFE#TRPBF
LT8705FE
38-Lead Plastic TSSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, SHDN = 3V unless otherwise noted. (Note 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Voltage Supplies and Regulators
VIN Operating Voltage Range
VIN Quiescent Current
VIN Quiescent Current in Shutdown
EXTVCC Switchover Voltage
EXTVCC Switchover Hysteresis
INTVCC Current Limit
INTVCC Voltage
INTVCC Load Regulation
INTVCC, GATEVCC Undervoltage Lockout
INTVCC, GATEVCC Undervoltage Lockout Hysteresis
INTVCC Regulator Dropout Voltage
LDO33 Pin Voltage
EXTVCC = 0V
EXTVCC = 7.5V
Not Switching, VEXTVCC = 0
VSHDN = 0V
IINTVCC = 20mA, VEXTVCC Rising
l 5.5
l 2.8
80
V
80
V
2.65 4.2
mA
0
1
µA
l 6.15 6.4 6.6
V
0.18
V
Maximum Current Draw from INTVCC and LDO33
Pins Combined. Regulated from VIN or EXTVCC (12V)
INTVCC = 5.25V
l 90 127 165
mA
INTVCC = 4.5V
l 28 42 55
mA
Regulated from VIN, IINTVCC = 20mA
l 6.15 6.35 6.55
V
Regulated from EXTVCC (12V), IINTVCC = 20mA
l 6.15 6.35 6.55
V
IINTVCC = 0mA to 50mA
–0.5 –1.5
%
INTVCC Falling, GATEVCC Connected to INTVCC
l 4.45 4.65 4.85
V
GATEVCC Connected to INTVCC
160
mV
VIN-VINTVCC, IINTVCC = 20mA
245
mV
5mA from LDO33 Pin
l 3.23 3.295 3.35
V
LDO33 Pin Load Regulation
LDO33 Pin Current Limit
ILDO33 = 0.1mA to 5mA
–0.25 –1
%
l 12 17.25 22
mA
LDO33 Pin Undervoltage Lockout
LDO33 Falling
2.96 3.04 3.12
V
LDO33 Pin Undervoltage Lockout Hysteresis
35
mV
Switching Regulator Control
Maximum Current Sense Threshold (VCSP – VCSN)
Maximum Current Sense Threshold (VCSN – VCSP)
Gain from VC to Maximum Current Sense Voltage
(VCSP-VCSN) (A5 in the Block Diagram)
SHDN Input Voltage High
Boost Mode, Minimum M3 Switch Duty Cycle
Buck Mode, Minimum M2 Switch Duty Cycle
Boost Mode
Buck Mode
SHDN Rising to Enable the Device
l 102 117 132
l 69 86 102
150
–150
l 1.184 1.234 1.284
mV
mV
mV/V
mV/V
V
SHDN Input Voltage High Hysteresis
50
mV
SHDN Input Voltage Low
Device Disabled, Low Quiescent Current
l
0.35
V
8705p
For more information www.linear.com/8705
3
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