LT3685 LINER [Linear Technology], LT3685 Datasheet - Page 3

• Manufacturer Part Number: LT3685
• Description: 36V, 4A, 1.5MHz Synchronous Step-Down Switching Regulator
• Manufacturer: LINER [Linear Technology]

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
PARAMETER
Boost Schottky Diode Drop (V
BST Voltage (Note 5) (V
BST Pin Current
BST Pin Leakage
HS Switch Drop (V
HS Switch Current Limit (Note 6)
HS Switch Leakage Current
HS Minimum Switch Off-Time
LS Switch Off Voltage Drop
LS Switch On-Resistance
LS Switch On-Resistance
LS Switch Current Threshold
LS Switch Leakage Current
V
V
EN Input Current
EN Input Voltage, Enable
EN Input Voltage, Disable
UVLO Threshold Voltage
UVLO Pin Current
UVLO Pin Current
UVLO Pin Current Hysteresis
Pull-Up Current at SS Pin
Tracking Offset (V
SYNC Input Voltage High
SYNC Input Voltage Low
SYNC Input Resistance to GND
SYNC Input Frequency
Feedback Reference Voltage
FB Pin Bias Current Flows Out of Pin
FB Voltage Line Regulation
PG Threshold as Percentage of V
PG Hysteresis
PG Sink Current
PG Leakage
Error Amplifier Transconductance
Error Amp Voltage Gain
CCINT
CCINT
Pin Output Voltage
Pin Output Voltage
SS
IN
– V
– V
FB
BST
SW
)
)
– V
BIAS
SW
FB
– V
)
BST
)
CONDITIONS
I
Minimum BOOST Voltage Above SW, I
I
V
I
V
I
I
I
V
V
I
I
V
V
V
V
I
V
V
V
3.6V < V
V
V
V
BIAS
SW
SW
SW
SW
SW
VCCINT
VCCINT
UVH
SW
SW
EN
EN
EN
EN
UVLO
UVLO
SS
SS
FB
FB
PG
PG
= 4A
= 4A
= 4A
= 4A, V
= 4A, V
= 0V, V
= 800mV
Rising
= 0V, V
= 12V
= 2.5V
= 0.8V
= 0.4V
= 0.3V
= 5V
= 12V, V
= 0V
– I
= 200mA
= 1.33V
= 1.1V
= 0µA
= –10mA
UVL
IN
< 36V
SW
SW
CCINT
CCINT
BIAS
A
= 12V, V
= 12V, V
= 25°C, V
= 5V
= 4V
= 0V
The
BST
BST
l
= 12V, T
=12V
IN
denotes the specifications which apply over the full operating
= 12V unless otherwise noted (Notes 3, 7).
J
= 125°C
SW
= 4A
l
l
l
l
l
MIN
–1.2
0.17
150
786
100
5.5
4.3
4.2
1.5
1.1
1.2
0.8
–4
88
4
0.001
–2.0
TYP
820
370
700
300
800
500
400
1.6
0.1
6.6
0.1
0.1
4.9
4.8
2.5
0.1
0.1
70
30
30
–2
–8
90
12
60
5
8
2
7
MAX
1.33
–3.8
–2.8
0.01
950
140
600
210
850
600
814
–40
2.3
6.5
5.3
5.3
0.4
2.8
0.4
1.5
60
90
10
95
15
15
92
6
8
2
6
1
1
LT3690
UNITS
3
µA/V
MHz
3690f
%/V
mΩ
mΩ
mV
mA
mV
mV
mV
mV
mV
kΩ
µA
µA
µA
µA
µA
µA
µA
µA
µA
µA
nA
µA
µA
dB
ns
%
V
A
A
V
V
V
V
V
V
V