LT3433
W W
U W
U
W U
ABSOLUTE MAXIMUM RATINGS
PACKAGE/ORDER INFORMATION
(Note 1)
TOP VIEW
Input Supply (VIN) .................................... –0.3V to 60V
Boosted Supply (VBST) .............. –0.3V to VSW_H + 30V
(VBST(MAX) = 80V)
ORDER PART
SGND
1
2
3
4
5
6
7
8
16
SGND
NUMBER
V
15 SW_L
BST
LT3433EFE
LT3433IFE
SW_H
14
13
12
11
10
9
PWRGND
Internal Supply (VBIAS) ............................. –0.3V to 30V
SW_H Switch Voltage.................................. –2V to 60V
SW_L Switch Voltage ............................... –0.3V to 30V
Feedback Voltage (VFB)............................... –0.3V to 5V
Operating Junction Temperature Range (Note 5)
LT3433E (Note 6) ............................ – 40°C to 125°C
LT3433I ........................................... – 40°C to 125°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
V
IN
V
V
OUT
17
BURST_EN
BIAS
V
C
SHDN
SS
V
FB
FE PART MARKING
SGND
SGND
3433EFE
3433IFE
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 40°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) MUST BE SOLDERED TO SGND
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The ● denotes specifications that apply over the full operating temperature range, otherwise specifications are at TA = 25°C.
VIN = 13.8V, VFB = 1.25V, VOUT = 5V, VBURST_EN = 0V, VBST – VIN = 5V, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
60
UNITS
V
V
Operating Voltage Range
Undervoltage Lockout
Undervoltage Lockout Hysteresis
Operating Voltage Range
Operating Voltage Range
●
●
4
V
V
IN
Enable Threshold
3.4
3.95
IN(UVLO)
160
mV
V
V
V
●
3.3
3.3
20
OUT
BST
V
V
< V
– V
+ 20V
●
●
75
20
V
V
BST
BST
SW_H
SW_H
I
Normal Operation
Burst Mode Operation
Shutdown
(Notes 2, 3)
●
●
●
580
100
10
940
190
25
µA
µA
µA
VIN
V
V
< 0.6V
< 0.4V
VC
SHDN
V
Internal Supply Output Voltage
Operating Voltage Range
●
●
●
2.6
2.9
20
V
V
BIAS
I
Normal Operation
Burst Mode Operation
Shutdown
660
0.1
0.1
4.5
990
µA
µA
µA
VBIAS
V
V
< 0.6V
VC
< 0.4V
SHDN
Short-Circuit Current Limit
mA
R
R
Boost Supply Switch On-Resistance
Output Supply Switch On-Resistance
Shutdown Pin Thresholds
I
I
= 500mA
= 500mA
●
●
0.8
0.6
1.2
1
Ω
Ω
SWH(ON)
SWL(ON)
SHDN
SW
SW
V
Disable
Enable
●
●
0.4
V
V
1
I
I
I
/I
Boost Supply Switch Drive Current
Output Supply Switch Drive Current
Switch Current Limit
High Side Switch On, I = 500mA
●
●
●
30
30
50
50
0.9
mA/A
mA/A
A
VBST SW
SW
/I
Low Side Switch On, I = 500mA
SW
VOUT SW
0.5
3
0.7
LIM
Foldback Current Limit
V
= 0V
0.35
5
A
FB
I
Soft-Start Output Current
●
●
9
µA
SS
V
Feedback Reference Voltage
1.224
1.215
1.231
1.238
1.245
V
V
FB
3433ia
2
Linear [ Linear ]
