Datasheet
LT3434
2
3434fb
(Note 1)
V
IN
, SHDN, BIAS, PGOOD, SW ............................... 60V
BOOST Pin Above SW ............................................ 35V
BOOST Pin Voltage ................................................. 68V
SYNC, C
SS
, PGFB, FB................................................ 6V
Operating JunctionTemperature Range
LT3434EFE (Note 2) ........................ –40°C to 125°C
LT3434IFE (Note 2) ......................... –40°C to 125°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
Consult LTC Marketing for parts specified with wider operating temperature ranges.
LT3434EFE
LT3434IFE
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
J
= 25°C. V
IN
= 12V, SHDN = 12V, BIAS = 5V, FB/PGFB = 1.25V,
C
SS
/SYNC = 0V unless otherwise noted.
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD IS GND (PIN 17)
MUST BE SOLDERED TO GND (PIN 8)
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/
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
SHDN
SHDN Threshold 1.15 1.3 1.45 V
I
SHDN
SHDN Input Current SHDN = 12V ● 520 µA
Minimum Input Voltage (Note 3) ● 2.4 3 V
I
VINS
Supply Shutdown Current SHDN = 0V, BOOST = 0V, FB/PGFB = 0V 0.1 2 µA
Supply Sleep Current (Note 4) BIAS = 0V, FB = 1.35V ● 170 250 µA
FB = 1.35V
● 45 75 µA
I
VIN
Supply Quiescent Current BIAS = 0V, FB = 1.15V 3.2 6 mA
BIAS = 5V, FB = 1.15V 2.6 5 mA
Minimum BIAS Voltage (Note 5) FB = 1.15V ● 2.7 3.1 V
I
BIASS
BIAS Sleep Current (Note 4) ● 110 180 µA
I
BIAS
BIAS Quiescent Current SYNC = 3.3V 700 900 µA
Minimum Boost Voltage (Note 6) I
SW
= 3A 1.8 V
Input Boost Current (Note 7) I
SW
= 3A 65 85 mA
V
REF
Reference Voltage (V
REF
) 3.3V < V
VIN
< 60V ● 1.225 1.25 1.275 V
I
FB
FB Input Bias Current 75 200 nA
EA Voltage Gain (Note 8) 900 V/V
EA Voltage g
m
dI(V
C
)= ±10µA 400 650 900 µMho
EA Source Current FB = 1.15V 20 40 55 µA
EA Sink Current FB = 1.35V 15 30 40 µA
V
C
to SW g
m
6A/V
FE PART
MARKING
3434EFE
3434IFE
FE PACKAGE
16-LEAD PLASTIC TSSOP
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
NC
SW
V
IN
V
IN
SW
BOOST
C
T
GND
PGOOD
SHDN
SYNC
PGFB
FB
V
C
BIAS
C
SS
17