LTC3522 Datasheet, PDF (2/20 Pages) Linear Technology – Synchronous 400mA Buck-Boost and 200mA Buck Converters

LTC3522
ABSOLUTE MAXIMUM RATINGS
(Note 1)
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
PACKAGE/ORDER INFORMATION
TOP VIEW
16 15 14 13
FB2 1
12 V_OUT1
PWM 2
GND 3
11 SW1A
17
10 SW1B
PGOOD2 4
9 PGND2
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 68°C/W
EXPOSED PAD (PIN 17) IS GND AND MUST BE SOLDERED TO PCB GROUND
ORDER PART NUMBER UD PART MARKING
LTC3522EUD
LCRQ
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. PV_IN1 = PV_IN2 = 3.6V, V_OUT1 = 3.3V unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Voltage
● 2.4
5.5
V
Quiescent Current—Shutdown
Burst Mode Quiescent Current
Oscillator Frequency
V_SHDN1 = V_SHDN2 = 0V
V_FB1 = 1.1V, V_FB2 = 0.66V, V_PWM = 0V
●
0.01
1
μA
25
μA
● 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
Power Good Outputs Leakage
Buck Converter
I_PGOOD1 = I_PGOOD2 = 1mA
V_PGOOD1 = V_PGOOD2 = 5.5V
0.02 0.1
V
0.1
10
μA
PMOS Switch Resistance
0.41
Ω
NMOS Switch Resistance
0.34
Ω
NMOS Switch Leakage
PMOS Switch Leakage
Feedback Voltage
V_SW2 = 5V, PV_IN1 = PV_IN2 = 5V
V_SW2 = 0V, PV_IN1 = PV_IN2 = 5V
(Note 4)
0.1
5
μA
0.1
10
μA
● 0.582 0.594 0.606
V
Feedback Input Current
1
50
nA
Peak Current Limit
(Note 3)
300
400
mA
Maximum Duty Cycle
Minimum Duty Cycle
V_FB2 = 0.54V
V_FB2 = 0.66V
● 100
●
%
0
%
3522f
2