Datasheet
LTC3523/LTC3523-2
2
3523fb
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS
V
IN1
, V
IN2
, V
BAT
, V
OUT
Voltages .................... –0.3V to 6V
SHDN1, PGOOD1, PGOOD2, FB1 Voltages .. –0.3V to 6V
SHDN2, FB2, MODE Voltages ...... –0.3V to (V
IN2
+ 0.3V)
SW1 Voltage
DC .............................................................. 0.3V to 6V
Pulse < 100ns .......................................... –0.3V to 7V
SW2 Voltage Pulse < 100ns ......... –0.3V to (V
IN2
+ 0.3V)
Operating Temperature Range
(Notes 2, 3) .............................................. –40°C to 85°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
16 15 14 13
5 6 7 8
TOP VIEW
17
UD PACKAGE
16-LEAD (3mm s 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1FB1
V
IN1
PG00D1
V
OUT
FB2
PGOOD2
MODE
V
IN2
SHDN1
V
BAT
GND3
SHDN2
SW1
GND1
GND2
SW2
T
JMAX
= 125°C, θ
JA
= 68°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Start-Up Voltage
l
1.6 1.8 V
Frequency LTC3523
LTC3523-2
l
l
0.9
1.8
1.2
2.4
1.5
2.65
MHz
MHz
Quiescent Current–Shutdown V
SHDN1
= V
SHDN2
= 0V, V
OUT
= 0V, V
IN1
= V
IN2
= V
BAT
0.5 3 μA
Quiescent Current –Sleep Measured from V
SUPPLY
, V
IN1
= V
IN2
= V
BAT
= 2.4V 45 μA
Quiescent Current V
OUT
– Sleep Measured from V
OUT
= 3.3V (Note 4) 15 μA
SHDN1, SHDN2 Input High 1V
SHDN1, SHDN2 Input Low 0.35 V
SHDN1, SHDN2 Input Current V
SHDN
= 5.5V 1.4 2 μA
PGOOD1, PGOOD2 Threshold Referenced to the Feedback Voltage –6 –9 –14 %
PGOOD1, PGOOD2 Low Voltage I
PGOOD
= 1mA 0.35 V
PGOOD1, PGOOD2 Leakage V
PGOOD
= 5.25V 0.01 1 μA
MODE Input High 1.0 V
MODE Input Low
0.35 V
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN1
= V
IN2
= V
BAT
= 2.4V, V
OUT
= 3.3V, unless otherwise specifi ed.
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3523EUD#PBF
LTC3523EUD-2#PBF
LTC3523EUD#TRPBF
LTC3523EUD-2#TRPBF
LCYC
LDDR
16-Lead (3mm × 3mm) Plastic DFN
16-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to: http://www.linear.com/tapeandreel/