Datasheet

LT8705
3
8705fb
For more information www.linear.com/LT8705
elecTrical characTerisTics
PARAMETER CONDITIONS MIN TYP MAX UNITS
Voltage Supplies and Regulators
V
IN
Operating Voltage Range EXTV
CC
= 0V
EXTV
CC
= 7.5V
l
l
5.5
2.8
80
80
V
V
V
IN
Quiescent Current Not Switching, V
EXTVCC
= 0 2.65 4.2 mA
V
IN
Quiescent Current in Shutdown V
SHDN
= 0V 0 1 µA
EXTV
CC
Switchover Voltage I
INTVCC
= 20mA, V
EXTVCC
Rising
l
6.15 6.4 6.6 V
EXTV
CC
Switchover Hysteresis 0.18 V
INTV
CC
Current Limit Maximum Current Draw from INTV
CC
and LDO33
Pins Combined. Regulated from V
IN
or EXTV
CC
(12V)
INTV
CC
= 5.25V
INTV
CC
= 4.5V
l
l
90
28
127
42
165
55
mA
mA
INTV
CC
Voltage Regulated from V
IN
, I
INTVCC
= 20mA
Regulated from EXTV
CC
(12V), I
INTVCC
= 20mA
l
l
6.15
6.15
6.35
6.35
6.55
6.55
V
V
INTV
CC
Load Regulation I
INTVCC
= 0mA to 50mA –0.5 –1.5 %
INTV
CC
, GATEV
CC
Undervoltage Lockout INTV
CC
Falling, GATEV
CC
Connected to INTV
CC
l
4.45 4.65 4.85 V
INTV
CC
, GATEV
CC
Undervoltage Lockout Hysteresis GATEV
CC
Connected to INTV
CC
160 mV
INTV
CC
Regulator Dropout Voltage V
IN
-V
INTVCC
, I
INTVCC
= 20mA 245 mV
LDO33 Pin Voltage 5mA from LDO33 Pin
l
3.23 3.295 3.35 V
LDO33 Pin Load Regulation I
LDO33
= 0.1mA to 5mA –0.25 –1 %
LDO33 Pin Current Limit
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 (V
CSP
– V
CSN
) Boost Mode, Minimum M3 Switch Duty Cycle
l
102 117 132 mV
Maximum Current Sense Threshold (V
CSN
– V
CSP
) Buck Mode, Minimum M2 Switch Duty Cycle
l
69 86 102 mV
Gain from V
C
to Maximum Current Sense Voltage
(V
CSP
-V
CSN
) (A5 in the Block Diagram)
Boost Mode
Buck Mode
150
–150
mV/V
mV/V
SHDN Input Voltage High
SHDN Rising to Enable the Device
l
1.184 1.234 1.284 V
SHDN Input Voltage High Hysteresis 50 mV
SHDN Input Voltage Low Device Disabled, Low Quiescent Current
l
0.35 V
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 12V, SHDN = 3V unless otherwise noted. (Note 3)
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/