Datasheet
LTC3522
2
3522fa
PIN CONFIGURATION
ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
PV
IN1
, PV
IN2
Voltage .................................... –0.3V to 6V
SW1A, SW1B, SW2 Voltage
DC ............................................................ –0.3V to 6V
Pulsed < 100ns ........................................... –1V to 7V
Voltage, All Other Pins ................................. –0.3V to 6V
Operating Temperature Range (Note 2) ... –40°C to 85°C
Maximum Junction Temperature (Note 5) ............ 125°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage
●
2.4 5.5 V
Quiescent Current—Shutdown V
SHDN1
= V
SHDN2
= 0V
●
0.01 1 µA
Burst Mode Quiescent Current V
FB1
= 1.1V, V
FB2
= 0.66V, V
PWM
= 0V 25 µA
Oscillator Frequency
●
0.8 1.07 1.33 MHz
SHDN1, SHDN2, PWM Input High Voltage 1.4 V
SHDN1, SHDN2, PWM Input Low Voltage 0.4 V
Power Good Outputs Low Voltage I
PGOOD1
= I
PGOOD2
= 1mA 0.02 0.1 V
Power Good Outputs Leakage V
PGOOD1
= V
PGOOD2
= 5.5V 0.1 10 µA
Buck Converter
PMOS Switch Resistance 0.41
Ω
NMOS Switch Resistance 0.34
Ω
NMOS Switch Leakage V
SW2
= 5V, PV
IN1
= PV
IN2
= 5V 0.1 5 µA
PMOS Switch Leakage V
SW2
= 0V, PV
IN1
= PV
IN2
= 5V 0.1 10 µA
Feedback Voltage (Note 4)
●
0.582 0.594 0.606 V
Feedback Input Current 150 nA
Peak Current Limit (Note 3) 300 400 mA
16 15 14 13
5 6 7 8
TOP VIEW
17
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
9
10
11
12
4
3
2
1FB2
PWM
GND
PGOOD2
V
OUT1
SW1A
SW1B
PGND2
SHDN2
PV
IN2
SW2
PGND1
FB1
PGOOD1
SHDN1
PV
IN1
T
JMAX
= 125°C, θ
JA
= 68°C/W
EXPOSED PAD (PIN 17) IS GND AND MUST BE SOLDERED TO PCB GROUND
The ● denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. PV
IN1
= PV
IN2
= 3.6V, V
OUT1
= 3.3V unless otherwise noted.
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3522EUD#PBF LTC3522EUD#TRPBF LCRQ 16-Lead (3mm × 3mm) Plastic QFN –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/
ORDER INFORMATION