Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
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/
4320fb
2
For more information
www.linear.com/LT4320
LT4320/LT4320-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2)
SYMBOL
PARAMETER
OUTP Voltage Range
OUTP Undervoltage Lockout (UVLO) Threshold
V
INT
I
OUTP
I
INn
∆V
SD
∆V
TGATE
V
BGATE
I
TGUn
I
TGSn
I
TGGn
I
BGUn
I
BGDn
INn Turn-On/Off Threshold
OUTP Pin Current
INn Pin Current
at 9V
at 72V
Topside Source-Drain Regulation Voltage (INn – OUTP)
LT4320
LT4320-1
Top Gate Drive (TGn – INn)
Bottom Gate Drive (BGn)
Top Gate Pull-Up Current
INn = OUTP+
∆V
SD(MAX)
+ 5mV, 10μA Out of
TGn, Other IN = 0V
INn = OUTP, 10μA Out of BGn, Other IN = 0V
TGn – INn = 0V, INn = OUTP + 0.1V
TGn – INn = 5V, INn = OUTP + 0.1V
Current Flows Out of TGn, Other IN = 0V
TGn – INn = 5V, INn = OUTP – 0.25V
Current Flows Into TGn, Other IN = 0V
INn = 0V, Other IN = OUTP = 9.0V, TGn = 5V
Current Flows Into TGn
BGn = 5V; INn = OUTP = 9.0V, Other IN = 0V
Current Flows Out of BGn
BGn = 5V; INn = 0V, Other IN = OUTP = 9.0V
Current Flows Into BGn
INn = OUTP, Other IN = 0V
OUTP = 9V, Other IN = 0V
INn = OUTP+
∆V
SD(MAX)
+ 5mV, Other IN = 0V
CONDITIONS
l
l
l
electrical characteristics
MIN
9
6.2
1.3
TYP
6.6
1.0
44
0.3
MAX
72
7.0
3.7
1.5
63
0.4
35
55
10.8
12
UNITS
V
V
V
mA
µA
mA
mV
mV
V
V
µA
µA
mA
mA
mA
mA
INn = OUTP+
∆V
SD(MAX)
+ 5mV, Other IN = 0V
l
l
l
l
l
l
l
l
l
l
l
l
l
8
26
6.6
7.0
425
120
1.25
6.0
1.9
12.5
20
40
Top Gate Pull-Down Current to INn
Top Gate Pull-Down Current to OUTN
Bottom Gate Pull-Up Current
Bottom Gate Pull-Down Current
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Unless otherwise specified,
exposure to any Absolute Maximum Rating condition for extended periods
may affect device reliability and lifetime.
Note 2:
All voltages are referenced to OUTN = 0V unless otherwise specified.
Note 3:
Externally forced voltage absolute maximums. The LT4320 may
exceed these limits during normal operation.
4320fb
For more information
www.linear.com/LT4320
3
LT4320/LT4320-1
typical perForMance characteristics
I
INn
and I
OUTP
vs OUTP
1200
1000
800
600
400
200
0
INn
I
OUTP
(µA)
OTHER IN = 0V
OUTP
1200
1000
800
600
400
200
0
7
∆V
SD
= 100mV
∆V
SD
= 40mV
9
13
17
OUTP (V)
4320 G02
4320 G03
I
OUTP
vs OUTP
IN1 AND IN2 FLOATING
11
10
∆V
TGATE
vs OUTP
OTHER IN = 0V
CURRENT (µA)
∆V
TGATE
(V)
0
20
40
OUTP (V)
60
80
9
8
0
20
40
INn = OUTP (V)
60
80
4320 G01
6
21
25
12
11
10
V
BGATE
(V)
9
8
7
6
V
BGATE
vs OUTP
1000
900
800
700
500
400
300
200
OTHER IN = 0V
9
13
17
OUTP (V)
21
25
4320 G04
TGn Pull-Up Strength
INn = OUTP + 100mV
OTHER IN = 0V
5
TGn Pull-Down Strength to INn
INn = OUTP – 250mV
OTHER IN = 0V
4
I
TGSn
(mA)
OUTP = 9V
OUTP = 12V
OUTP = 72V
0
2
4
6
∆V
TGATE
(V)
4320 G05
I
TGn
(µA)
600
3
2
1
0
OUTP = 9V
OUTP = 72V
0
2
4
6
∆V
TGATE
(V)
4320 G06
100
0
8
10
12
8
10
12
TGn Pull-Down Strength to OUTN
60
50
40
I
BGUn
(mA)
I
TGGn
(mA)
30
20
10
0
OUTP = 9V
OUTP = 12V
OUTP = 72V
0
2
4
6
TGn (V)
8
10
12
4320 G07
BGn Pull-Up Strength
5
OTHER IN = 0V
35
30
25
I
BGDn
(mA)
V
INn
= 9V
V
INn
= 12V
V
INn
= 72V
0
2
4
8
V
BGATE
(V)
6
10
12
14
3
20
15
10
1
5
0
BGn Pull-Down Strength
INn = 0V
OTHER IN = OUTP
4
2
0
0
2
4
6
V
BGATE
(V)
8
10
12
4320 G09
4320 G08
4320fb
4
For more information
www.linear.com/LT4320
LT4320/LT4320-1
pin Functions
(DFN, PDIP/MSOP)
IN2 (Pin 1/Pin 1):
Bridge Rectifier Input. IN2 connects to
the external NMOS transistors MTG2 source, MBG1 drain
and the power input.
TG2 (Pin 2/Pin 2):
Topside Gate Driver Output. TG2 pin
drives MTG2 gate.
BG2 (Pin 3/Pin 5):
Bottom-Side Gate Driver Output. BG2
pin drives MBG2 gate.
BG1 (Pin 4/Pin 6):
Bottom-Side Gate Driver Output. BG1
pin drives MBG1 gate.
OUTN (Pin 5/Pin 7):
OUTN is the rectified negative output
voltage, and connects to the sources of MBG1 and MBG2.
OUTP (Pin 6/Pin 9):
OUTP is the rectified positive output
voltage that powers the LT4320 and connects to the drains
of MTG1 and MTG2.
TG1 (Pin 7/Pin 11):
Topside Gate Driver Output. TG1 pin
drives MTG1 gate.
IN1 (Pin 8/Pin 12):
Bridge Rectifier Input. IN1 connects
to the external NMOS transistors MTG1 source, MBG2
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