LTC3520 Datasheet, PDF (2/24 Pages) Linear Technology – Synchronous 1A Buck-Boost and 600mA Buck Converters

LTC3520
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PV_IN1, PV_IN2, PV_IN3, SV_IN 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 150°C
PIN CONFIGURATION
TOP VIEW
24 23 22 21 20 19
SV_IN 1
A_OUT 2
A_IN 3
R_T 4
PWM1 5
SD1 6
18 FB1
17 SS1
16 SGND
25
15 V_C1
14 FB2
13 SS2
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 37°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3520EUF#PBF
LTC3520EUF#TRPBF
3520
24-Lead (4mm × 4mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C, S_VIN = P_VIN1 = P_VIN2 = P_VIN3 = 3.6V, V_OUT1 = 3.3V, R_T = 54.9k, unless
otherwise noted.
PARAMETER
Input Voltage
CONDITIONS
MIN TYP MAX UNITS
● 2.2
5.5
V
Quiescent Current in Shutdown
Undervoltage Lockout
Burst Mode Quiescent Current, Both Converters
Oscillator Frequency
Buck Converter
V⎯_S⎯_D⎯₁ = V⎯_S⎯_D⎯₂ = V⎯_S⎯_D⎯₃ = 0V
SV_IN Rising
V_FB1 = V_FB2 = 0.88V, V⎯_S⎯_D⎯₃ = 0V
R_T = 54.9k
●
0.01
1
µA
2
2.2
V
55
µA
● 0.8
1
1.2
MHz
PMOS Switch Resistance
0.32
Ω
NMOS Switch Resistance
0.18
Ω
NMOS Switch Leakage
PMOS Switch Leakage
V_SW2 = 5V, S_VIN = P_VIN1 = P_VIN2 = P_VIN3 = 5V
V_SW2 = 0V, S_VIN = P_VIN1 = P_VIN2 = P_VIN3 = 5V
0.1
5
µA
0.1
10
µA
3520f
2