LTC3425_15 Datasheet, PDF (2/24 Pages) Linear Technology – 5A, 8MHz, 4-Phase Synchronous Step-Up DC/DC Converter

LTC3425
ABSOLUTE AXI U RATI GS
(Note 1)
V_IN Voltage ................................................. – 0.3V to 6V
SWA-D Voltages ..........................................– 0.3V to 6V
V_OUTA-D, V_OUTS Voltages............................ – 0.3V to 6V
BURST, SHDN, SS, REFEN, SYNCOUT, PGOOD,
REFOUT, CCM, SYNCIN Voltages ............... – 0.3V to 6V
Operating Ambient Temperature Range
(Note 5) .............................................. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
32 31 30 29 28 27 26 25
GNDA 1
24 GNDD
GNDA 2
23 GNDD
SWA 3
V_OUTA 4
V_OUTB 5
SWB 6
GNDB 7
GNDB 8
22 SWD
21 V_OUTD
33
20 V_OUTC
19 SWC
18 GNDC
17 GNDC
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
T_JMAX = 125°C, θ_JA = 40°C/W 1 LAYER BOARD,
θ_JA = 35°C/W 4 LAYER BOARD, θ_JC = 1.1°C/W
EXPOSED PAD IS GND (PIN 33) MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
UH PART
MARKING
LTC3425EUH
3425
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T_A = 25°C. V_IN = 1.2V, V_OUT = 3.3V, R_T = 15k, unless otherwise noted.
PARAMETER
Minimum Start-Up Voltage
Minimum Operating Voltage
Output Voltage Adjust Range
Feedback Regulation Voltage
Feedback Input Current
V_OUT Quiescent Current—Burst Mode Operation
V_IN Quiescent Current—Shutdown
V_OUT Quiescent Current—Active
NMOS Switch Leakage
PMOS Switch Leakage
NMOS Switch On Resistance
PMOS Switch On Resistance
NMOS Current Limit
CONDITIONS
V_OUT = 0V, I_LOAD < 1mA
(Note 3)
MIN
q
q 2.4
q 1.196
BURST = 0V, REFEN = 0V, FB = 1.3V (Note 2)
BURST = 0V, REFEN = 2V, FB = 1.3V (Note 2)
SHDN = 0V, V_OUT = 0V, Not Including Switch Leakage
V_C = 0V, Nonswitching (Note 2)
V_SW = 5V
V_SW = 5V, V_OUT = 0V
(Note 4)
(Note 4)
I_LIM Resistor = 75k (Note 4)
I_LIM Resistor = 200k (Note 4)
q 5.0
q 1.8
TYP
0.88
1.220
1
12
18
0.1
1.8
0.1
0.1
0.04
0.05
7.0
2.7
MAX
1
0.5
5.25
1.244
50
25
35
1
3
5
10
UNITS
V
V
V
V
nA
µA
µA
µA
mA
µA
µA
Ω
Ω
A
A
3425f
2