Datasheet
LTC3425
2
3425f
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Start-Up Voltage V
OUT
= 0V, I
LOAD
< 1mA 0.88 1 V
Minimum Operating Voltage (Note 3) ● 0.5 V
Output Voltage Adjust Range ● 2.4 5.25 V
Feedback Regulation Voltage ● 1.196 1.220 1.244 V
Feedback Input Current 150 nA
V
OUT
Quiescent Current—Burst Mode Operation BURST = 0V, REFEN = 0V, FB = 1.3V (Note 2) 12 25 µA
BURST = 0V, REFEN = 2V, FB = 1.3V (Note 2) 18 35 µA
V
IN
Quiescent Current—Shutdown SHDN = 0V, V
OUT
= 0V, Not Including Switch Leakage 0.1 1 µA
V
OUT
Quiescent Current—Active V
C
= 0V, Nonswitching (Note 2) 1.8 3 mA
NMOS Switch Leakage V
SW
= 5V 0.1 5 µA
PMOS Switch Leakage V
SW
= 5V, V
OUT
= 0V 0.1 10 µA
NMOS Switch On Resistance (Note 4) 0.04 Ω
PMOS Switch On Resistance (Note 4) 0.05 Ω
NMOS Current Limit I
LIM
Resistor = 75k (Note 4) ● 5.0 7.0 A
I
LIM
Resistor = 200k (Note 4) ● 1.8 2.7 A
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
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LTC3425EUH
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
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
32 31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
33
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1GNDA
GNDA
SWA
V
OUTA
V
OUTB
SWB
GNDB
GNDB
GNDD
GNDD
SWD
V
OUTD
V
OUTC
SWC
GNDC
GNDC
SS
SHDN
SYNCIN
V
IN
R
T
I
LIM
CCM
SYNCOUT
REFEN
V
OUTS
SGND
FB
COMP
BURST
REFOUT
PGOOD
ELECTRICAL CHARACTERISTICS
The ● 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.
UH PART
MARKING
3425