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LT1640ALIS8#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LT1640AL/LT1640AH
Negative Voltage
Hot Swap Controller
■
Allows Safe Board Insertion and Removal
from a Live –48V Backplane
■
Operates from –10V to –80V
■
Programmable Inrush Current
■
Allows 50mA of Reverse Drain Pin Current
■
Programmable Electronic Circuit Breaker
■
Programmable Overvoltage Protection
■
Programmable Undervoltage Lockout
■
Power Good Control Output
The LT
®
1640AL/LT1640AH are 8-pin, negative voltage
Hot Swap
TM
controllers that allow a board to be safely
inserted and removed from a live backplane. Inrush cur-
rent is limited to a programmable value by controlling the
gate voltage of an external N-channel pass transistor. The
pass transistor is turned off if the input voltage is less than
the programmable undervoltage threshold or greater than
the overvoltage threshold. A programmable electronic
circuit breaker protects the system against shorts. The
PWRGD (LT1640AL) or PWRGD (LT1640AH) signal can
be used to directly enable a power module. The LT1640AL
is designed for modules with a low enable input and the
LT1640AH for modules with a high enable input.
The LT1640AL/LT1640AH are available in 8-pin PDIP and
SO packages.
■
Central Office Switching
■
–48V Distributed Power Systems
■
Negative Power Supply Control
Hot Swap is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Input Inrush Current
CONTACT
BOUNCE
1640A F07b
V
EE
V
DD
LT1640AL
SENSE
C1
†
150nF
25V
C2
†
3.3nF
100V
C3
0.1µF
100V
C4
100µF
100V
Q1
IRF530
R2
10Ω
5%
R3
†
18k
5%
R4
†
562k
1%
R5
†
9.09k
1%
R6
†
10k
1%
R1
†
0.02Ω
5%
4
OV
GND
GND
(SHORT PIN)
3
2
–48V
OV = 71V
*
* DIODES INC. SMAT70A
†
THESE COMPONENTS ARE APPLICATION
SPECIFIC AND MUST BE SELECTED BASED
UPON OPERATING CONDITIONS AND DESIRED
PERFORMANCE. SEE APPLICATIONS
INFORMATION.
UV = 37V
UV
56
8
7
1
GATE DRAIN
PWRGD
1640A TA01
V
OUT
+
SENSE
+
TRIM
SENSE
–
V
OUT
–
V
IN
–
ON/OFF
LUCENT
JW050A1-E
V
IN
+
2
9
5V
8
7
6
5
1
4
+
C5
100µF
16V
+
43
21
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LT1640AL/LT1640AH
ABSOLUTE MAXIMUM RATINGS
W
WW
U
Supply Voltage (V
DD
– V
EE
) .................... –0.3V to 100V
PWRGD, PWRGD Pins ........................... –0.3V to 100V
DRAIN Pin ................................................. –2V to 100V
SENSE, GATE Pins.................................... –0.3V to 20V
UV, OV Pins .............................................. –0.3V to 60V
Maximum Junction Temperature ......................... 125°C
Operating Temperature Range
LT1640ALC/LT1640AHC ........................ 0°C to 70°C
LT1640ALI/LT1640AHI...................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
(Note 1), All Voltages Referred to V
EE
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
DC
V
DD
Supply Operating Range ● 10 80 V
I
DD
Supply Current UV = 3V, OV = V
EE
, SENSE = V
EE
● 1.3 5 mA
V
CB
Circuit Breaker Trip Voltage V
CB
= (V
SENSE
– V
EE
) ● 40 50 60 mV
I
PU
GATE Pin Pull-Up Current Gate Drive On, V
GATE
= V
EE
● –30 –45 –60 µA
I
PD
GATE Pin Pull-Down Current Any Fault Condition 24 50 70 mA
I
SENSE
SENSE Pin Current V
SENSE
= 50mV –20 µA
∆V
GATE
External Gate Drive (V
GATE
– V
EE
), 15V ≤ V
DD
≤ 80V ● 10 13.5 18 V
(V
GATE
– V
EE
), 10V ≤ V
DD
< 15V ● 6815 V
V
UVH
UV Pin High Threshold Voltage UV Low to High Transition ● 1.213 1.243 1.272 V
V
UVL
UV Pin Low Threshold Voltage UV High to Low Transition ● 1.198 1.223 1.247 V
V
UVHY
UV Pin Hysteresis 20 mV
I
INUV
UV Pin Input Current V
UV
= V
EE
● –0.02 –0.5 µA
V
OVH
OV Pin High Threshold Voltage OV Low to High Transition ● 1.198 1.223 1.247 V
V
OVL
OV Pin Low Threshold Voltage OV High to Low Transition ● 1.165 1.203 1.232 V
V
OVHY
OV Pin Hysteresis 20 mV
I
INOV
OV Pin Input Current V
OV
= V
EE
● –0.03 –0.5 µA
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2), V
DD
= 48V, V
EE
= 0V unless otherwise noted.
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
S8 PART MARKING
LT1640ALCN8
LT1640ALCS8
LT1640ALIN8
LT1640ALIS8
1640AL
640ALI
T
JMAX
= 125°C, θ
JA
= 120°C/W (N8)
T
JMAX
= 125°C, θ
JA
= 150°C/W (S8)
1
2
3
4
8
7
6
5
TOP VIEW
V
DD
DRAIN
GATE
SENSE
PWRGD
OV
UV
V
EE
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
ORDER PART
NUMBER
S8 PART MARKING
LT1640AHCN8
LT1640AHCS8
LT1640AHIN8
LT1640AHIS8
1640AH
640AHI
T
JMAX
= 125°C, θ
JA
= 120°C/W (N8)
T
JMAX
= 125°C, θ
JA
= 150°C/W (S8)
1
2
3
4
8
7
6
5
TOP VIEW
V
DD
DRAIN
GATE
SENSE
PWRGD
OV
UV
V
EE
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
ELECTRICAL CHARACTERISTICS
Consult factory for parts specified with wider operating temperature ranges.
3
LT1640AL/LT1640AH
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 2), V
DD
= 48V, V
EE
= 0V unless otherwise noted.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
PG
Power Good Threshold V
DRAIN
– V
EE
, High to Low Transition 1.1 1.4 2.0 V
V
PGHY
Power Good Threshold Hysteresis 0.4 V
I
DRAIN
Drain Input Bias Current V
DRAIN
= 48V ● 10 50 500 µA
V
OL
PWRGD Output Low Voltage PWRGD (LT1640AL), (V
DRAIN
– V
EE
) < V
PG
I
OUT
= 1mA ● 0.48 0.8 V
I
OUT
= 5mA 1.50 3.0 V
PWRGD Output Low Voltage PWRGD (LT1640AH), V
DRAIN
= 5V
(PWRGD – DRAIN) I
OUT
= 1mA ● 0.75 1.0 V
I
OH
Output Leakage PWRGD (LT1640AL), V
DRAIN
=48V, ● 0.05 10 µA
V
PWRGD
= 80V
R
OUT
Power Good Output Impedance PWRGD (LT1640AH), (V
DRAIN
– V
EE
) < V
PG
● 2 6.5 kΩ
(PWRGD to DRAIN)
AC
t
PHLOV
OV High to GATE Low Figures 1, 2 1.7 µs
t
PHLUV
UV Low to GATE Low Figures 1, 3 1.5 µs
t
PLHOV
OV Low to GATE High Figures 1, 2 5.5 µs
t
PLHUV
UV High to GATE High Figures 1, 3 6.5 µs
t
PHLSENSE
SENSE High to Gate Low Figures 1, 4 2 3 4 µs
t
PHLPG
DRAIN Low to PWRGD Low (LT1640AL) Figures 1, 5 0.5 µs
DRAIN Low to (PWRGD – DRAIN) High (LT1640AH) Figures 1, 5 0.5 µs
t
PLHPG
DRAIN High to PWRGD High (LT1640AL) Figures 1, 5 0.5 µs
DRAIN High to (PWRGD – DRAIN) Low (LT1640AH) Figures 1, 5 0.5 µs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to V
EE
unless otherwise
specified.
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (mA)
1.3
1.4
1.5
60
100
1640A G01
1.2
1.1
0
20 40 80
1.6
1.7
1.8
T
A
= 25°C
Supply Current vs Supply Voltage
TEMPERATURE (°C)
–50 –25
1.0
SUPPLY CURRENT (mA)
1.1
1.2
1.3
1.4
1.6
0255075
1640A G02
100
1.5
V
DD
= 48V
Supply Current vs Temperature
SUPPLY VOLTAGE (V)
0
6
GATE VOLTAGE (V)
7
9
10
11
40
80
100
15
1640A G03
8
20 60
12
13
14
T
A
= 25°C
Gate Voltage vs Supply Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
ELECTRICAL CHARACTERISTICS
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LT1640ALIS8#PBF

Mfr. #:
Buy LT1640ALIS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Hot Swap Voltage Controllers Hot Swap Controller for -48V
Lifecycle:
New from this manufacturer.
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