Datasheet

LT3690
3
3690fa
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 12V unless otherwise noted (Notes 3, 7).
PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN
Fixed Undervoltage Lockout
l
3.0 3.9 V
V
IN
Overvoltage Lockout OVLO V
IN
Rising
l
36 38.2 40 V
Quiescent Current from V
IN
V
EN
= 0.2V 0.1 1 µA
V
BIAS
= 3V, V
FB
= 0.85V Not Switching
l
35 60 µA
V
BIAS
= 0V, V
FB
= 0.85V Not Switching 110 150 µA
Quiescent Current from BIAS Pin V
EN
= 0.2V 0.1 1 µA
V
BIAS
= 3V, V
FB
= 0.85V Not Switching
l
70 110 µA
V
BIAS
= 0V, V
FB
= 0.85V Not Switching –3 –10 µA
Boost Schottky Diode Drop (V
BIAS
– V
BST
) I
BIAS
= 200mA 820 950 mV
BST Voltage (Note 5) (V
BST
– V
SW
) Minimum BOOST Voltage Above SW, I
SW
= 4A
l
1.6 2.3 V
BST Pin Current I
SW
= 4A 70 140 mA
BST Pin Leakage V
SW
= 12V, V
BIAS
= 0V 0.1 6 µA
HS Switch Drop (V
IN
– V
SW
) I
SW
= 4A 370 600 mV
HS Switch Current Limit (Note 6) 5.5 6.6 8 A
HS Switch Leakage Current V
SW
= 0V 0.1 2 µA
HS Minimum Switch Off-Time
l
210 ns
LS Switch Off Voltage Drop I
SW
= 4A 700 850 mV
LS Switch On-Resistance I
SW
= 4A, V
CCINT
= 5V 30 60 mΩ
LS Switch On-Resistance I
SW
= 4A, V
CCINT
= 4V 30 90 mΩ
LS Switch Current Threshold 4 5 6.5 A
LS Switch Leakage Current V
EN
= 0V, V
SW
= 12V, V
BST
=12V 0.1 10 µA
V
EN
= 0V, V
SW
= 12V, V
BST
= 12V, T
J
= 125°C 95 µA
V
CCINT
Pin Output Voltage I
VCCINT
= 0µA 4.3 4.9 5.3 V
V
CCINT
Pin Output Voltage I
VCCINT
= –10mA 4.2 4.8 5.3 V
EN Input Current V
EN
= 12V 8 15 µA
V
EN
= 2.5V 2.5 6 µA
EN Input Voltage, Enable 1.5 V
EN Input Voltage, Disable 0.4 V
UVLO Threshold Voltage 1.1 1.33 V
UVLO Pin Current V
UVLO
= 1.33V –2.0 –3.8 µA
UVLO Pin Current V
UVLO
= 1.1V 0.1 1 µA
UVLO Pin Current Hysteresis I
UVH
– I
UVL
1.2 2 2.8 µA
Pull-Up Current at SS Pin V
SS
= 0.8V –1.2 –2 –2.8 µA
Tracking Offset (V
SS
– V
FB
) V
SS
= 0.4V –4 7 15 mV
SYNC Input Voltage High 0.8 V
SYNC Input Voltage Low 0.4 V
SYNC Input Resistance to GND 150 300 600 kΩ
SYNC Input Frequency 0.17 1.5 MHz
Feedback Reference Voltage
l
792
786
800
800
808
814
mV
mV
FB Pin Bias Current Flows Out of Pin V
FB
= 800mV
l
–8 –40 nA
FB Voltage Line Regulation 3.6V < V
IN
< 36V 0.001 0.01 %/V