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LTC1473CGN#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
1
LTC1473
Dual PowerPath
TM
Switch Driver
■
Power Path Management for Systems with Multiple
DC Sources
■
All N-Channel Switching to Reduce Power Losses and
System Cost
■
Switches and Isolates Sources Up to 30V
■
Adaptive High Voltage Step-Up Regulator for N-Channel
Gate Drive
■
Capacitor Inrush and Short-Circuit Current Limited
■
User-Programmable Timer to Limit Switch Dissipation
■
Small Footprint: 16-Pin Narrow SSOP
The LTC
®
1473 provides a power management solution for
single and dual battery notebook computers and other
portable equipment. The LTC1473 drives two sets of back-
to-back N-channel MOSFET switches to route power to the
input of the main system switching regulator. An internal
boost regulator provides the voltage to fully enhance the
logic level N-channel MOSFET switches.
The LTC1473 senses current to limit surge currents both
into and out of the batteries and the system supply
capacitor during switch-over transitions or during fault
conditions. A user-programmable timer monitors the time
the MOSFET switches are in current limit and latches them
off when the programmed time is exceeded.
A unique “2-diode mode” logic ensures system start-up
regardless of which input receives power first.
■
Notebook Computers
■
Portable Instruments
■
Handi-Terminals
■
Portable Medical Equipment
■
Portable Industrial Control Equipment
PowerPath is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
IN1
IN2
DIODE
TIMER
V
+
V
GG
SW
GND
GA1
SAB1
GB1
SENSE
+
SENSE
–
GA2
SAB2
GB2
LTC1473
C
OUT
R
SENSE
0.04Ω
1µF
1µF
MMBD914LTI
1mH*
Si9926DY
MMBD2838LTI
1473 TA01
BAT1
DCIN
BAT2
INPUT OF SYSTEM
HIGH EFFICIENCY DC/DC
SWITCHING REGULATOR
(LTC1735, ETC)
FROM POWER
MANAGEMENT
µP
C
TIMER
4700pF
MBRD340
Si9926DY
*COILCRAFT 1812LS-105XKBC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATION
U
2
LTC1473
ABSOLUTE MAXIMUM RATINGS
W
WW
U
DCIN, BAT1, BAT2 Supply Voltage .............. –0.3 to 32V
SENSE
+
, SENSE
–
, V
+
.................................. –0.3 to 32V
GA1, GB1, GA2, GB2 ................................... –0.3 to 42V
SAB1, SAB2 ................................................. – 0.3 to 32V
SW, V
GG
...................................................... – 0.3 to 42V
IN1, IN2, DIODE........................................–0.3V to 7.5V
Junction Temperature (Note 2)............................. 125°C
Operating Temperature Range
Commercial ............................................. 0°C to 70°C
Industrial ........................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
PACKAGE/ORDER INFORMATION
W
U
U
LTC1473CGN
LTC1473IGN
TOP VIEW
GN PACKAGE
16-LEAD NARROW PLASTIC SSOP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
IN1
IN2
DIODE
TIMER
V
+
V
GG
SW
GND
GA1
SAB1
GB1
SENSE
+
SENSE
–
GA2
SAB2
GB2
T
JMAX
= 125°C, θ
JA
= 150°C/ W
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
+
Supply Operating Range 4.75 30 V
I
S
Supply Current V
IN1
= V
DIODE
= 5V, V
IN2
= 0V, V
SENSE
+
= V
SENSE
–
= 20V ● 100 200 µA
V
GS
V
GS
Gate Supply Voltage V
GS
= V
GG
– V
+
● 7.5 8.5 9.5 V
V
+
UVLO
V
+
Undervoltage Lockout Threshold V
+
Ramping Down 2.7 3.1 3.5 V
V
+
UVLOHYS
V
+
Undervoltage Lockout Hysteresis 0.75 1 1.25 V
V
HIDIGIN
Digital Input Logic High ● 2 1.6 V
V
LODIGIN
Digital Input Logic Low ● 1.5 0.8 V
I
IN
Input Current V
IN1
= V
IN2
= V
DIODE
= 5V ±1 µA
V
GS(ON)
Gate-to-Source ON Voltage I
GA1
= I
GA2
= I
GB1
= I
GB2
= –1µA, V
SAB1
= V
SAB2
= 20V ● 5.0 5.7 7.0 V
V
GS(OFF)
Gate-to-Source OFF Voltage I
GA1
= I
GA2
= I
GB1
= I
GB2
= 100µA, V
SAB1
= V
SAB2
= 20V ● 00.4 V
I
BSENSE
+
SENSE
+
Input Bias Current V
SENSE
+
= V
SENSE
–
= 20V ● 24.56.5µA
V
SENSE
+
= V
SENSE
–
= 0V (Note 3) ● –300 –160 – 100 µA
I
BSENSE
–
SENSE
–
Input Bias Current V
SENSE
+
= V
SENSE
–
= 20V ● 24.56.5µA
V
SENSE
+
= V
SENSE
–
= 0V (Note 3) ● –300 –160 – 100 µA
V
SENSE
Inrush Current Limit Sense Voltage V
SENSE
–
= 20V (V
SENSE
+
– V
SENSE
–
) ● 0.15 0.20 0.25 V
V
SENSE
–
= 0V (V
SENSE
+
– V
SENSE
–
) 0.10 0.20 0.30 V
I
PDSAB
SAB1, SAB2 Pull-Down Current V
IN1
= V
IN2
= V
DIODE
= 0.8V 5 20 35 µA
V
IN1
= V
IN2
= 0.8V, V
DIODE
= 2V 30 200 350 µA
I
TIMER
Timer Source Current V
IN1
= 0.8V, V
IN2
= V
DIODE
= 2V, V
TIMER
= 0V, ● 35.59 µA
V
SENSE
+
– V
SENSE
–
= 300mV
V
TIMER
Timer Latch Threshold Voltage V
IN1
= 0.8V, V
IN2
= V
DIODE
= 2V ● 1.1 1.2 1.3 V
t
ON
Gate Drive Rise Time C
GS
= 1000pF, V
SAB1
= V
SAB2
= 0V (Note 4) 33 µs
t
OFF
Gate Drive Fall Time C
GS
= 1000pF, V
SAB1
= V
SAB2
= 20V (Note 4) 2 µs
t
D1
Gate Drive Turn-On Delay C
GS
= 1000pF, V
SAB1
= V
SAB2
= 0V (Note 4) 22 µs
t
D2
Gate Drive Turn-Off Delay C
GS
= 1000pF, V
SAB1
= V
SAB2
= 20V (Note 4) 1 µs
f
OVGG
V
GG
Regulator Operating Frequency 30 kHz
ELECTRICAL CHARACTERISTICS
Test circuit, V
+
= 20V, unless otherwise specified.
Consult factory for Military grade parts.
(Note 1)
The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
GN PART MARKING
1473
1473I
3
LTC1473
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
DC Supply Current
vs Supply Voltage
SUPPLY VOLTAGE (V)
0
SUPPLY CURRENT (µA)
80
120
40
1473 G01
40
0
10
20
30
5
15
25
35
160
60
100
20
140
V
DIODE
= V
IN1
= 5V
V
IN2
= 0V
V
DIODE
= 5V
V
IN1
= V
IN2
= 0V
V
SENSE
+
= V
SENSE
–
= V
+
DC Supply Current vs V
SENSE
DC Supply Current
vs Temperature
TEMPERATURE (°C)
–50
50
SUPPLY CURRENT (µA)
60
80
90
100
0
140
1473 G02
70
–25 25 50 75 100 125
110
120
130
V
+
= 20V
V
DIODE
= V
IN1
= 5V
V
IN2
= 0V
V
DIODE
= 5V
V
IN1
= V
IN2
= 0V
V
GS
Gate-to-Source ON Voltage
vs Temperature
TEMPERATURE (°C)
–50
5.1
V
GS
GATE-TO-SOURCE ON VOLTAGE (V)
5.2
5.4
5.5
5.6
0
6.0
1473 G04
5.3
–25 25 50 75 100 125
5.7
5.8
5.9
V
+
= V
SAB
=20V
TEMPERATURE (°C)
–50
1.0
SUPPLY VOLTAGE (V)
1.5
2.5
3.0
3.5
0
5.5
1473 G05
2.0
–25 25 50 75 100 125
4.0
4.5
5.0
START-UP
THRESHOLD
SHUTDOWN
THRESHOLD
Undervoltage Lockout Threshold (V
+
)
vs Temperature
Note 4: Gate turn-on and turn-off times are measured with no inrush
current limiting, i.e., V
SENSE
= 0V. Gate rise times are measured from 1V to
4.5V and fall times are measured from 4.5V to 1V. Delay times are
measured from the input transition to when the gate voltage has risen or
fallen to 3V.
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: T
J
is calculated from the ambient temperature T
A
and power
dissipation P
D
according to the following formula:
T
J
= T
A
+ (P
D
)(150°C/W)
Note 3: I
S
increases by the same amount as I
BSENSE
+
+ I
BSENSE
–
when
their common mode falls below 5V.
ELECTRICAL CHARACTERISTICS
V
GS
Gate Supply Voltage
vs Temperature
TEMPERATURE (°C)
–50
8.1
V
GS
GATE SUPPLY VOLTAGE (V)
8.2
8.4
8.5
8.6
0
9.0
1473 G03
8.3
–25 25 50 75 100 125
8.7
8.8
8.9
V
+
= 20V
V
GS =
V
GG
– V
+
|V
SENSE
| COMMON MODE(V)
0
SUPPLY CURRENT (µA)
20
1473 • TPC02.5
5
10
15
2.5
7.5
12.5
17.5
500
450
400
350
300
250
200
150
100
V
+
= 20V
V
DIODE
= V
IN1
= 5V
V
IN2
= 0V
V
SENSE
+
– V
SENSE
–
= 0V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

LTC1473CGN#TRPBF

Mfr. #:
Buy LTC1473CGN#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Power Management Specialized - PMIC 2x PwrPath Switch Drvr
Lifecycle:
New from this manufacturer.
Delivery:
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