Datasheet

LT3472
2
3472f
V
IN
, SHDN Voltage ................................................... 16V
SWP, SWN, V
POS
Voltage ....................................... 36V
DN Voltage ............................................................ –36V
FBP, FBN, SSP, SSN Voltage ................................... 10V
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range
Extended Commercial.........................40°C to 85°C
Storage Temperature Range ................. 65°C to 125°C
ORDER PART
NUMBER
DFN PART
MARKING
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 3°C/W
EXPOSED PAD IS GND (PIN 11)
MUST BE SOLDERED TO PCB
LBGC
LT3472EDD
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
(Note 1)
ELECTRICAL CHARACTERISTICS
The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 3V, SHDN = 3V unless otherwise noted.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operation Voltage 2.2 V
Maximum Operation Voltage 16 V
Supply Current SHDN = 3V, Not Switching 2.8 mA
SHDN = 0V 0.1 1 µA
SHDN Voltage High 0.8 V
SHDN Voltage Low 0.3 V
SHDN Pin Bias Current SHDN = 3V 35 µA
Positive Feedback Voltage 1.2 1.25 1.3 V
Negative Feedback Voltage –5 0 5 mV
Positive Feedback Voltage Line Regulation 0.01 %/V
Negative Feedback Voltage Line Regulation 0.008 mV/V
FBP Current FBP = V
FBP
24.5 25 25.3 µA
FBN Current FBN = V
FBN
24.5 25 25.3 µA
FBP to Start Negative Channel 1.02 1.1 1.18 V
Switching Frequency 0.9 1.1 1.4 MHz
Maximum Duty Cycle (Both Channels) 88 92 %
Positive Channel Switch Current Limit 250 350 mA
Negative Channel Switch Current Limit 300 400 mA
Positive Channel Switch V
CESAT
I
SWP
= 200mA 245 mV
Negative Channel Switch V
CESAT
I
SWN
= 200mA 400 mV
Switch Leakage Current (Both Channels) V
SW
= 5V 0.01 5 µA
Schottky DP Forward Drop I
DP
= 150mA 700 950 mV
Schottky DN Forward Drop I
DN
= 150mA 750 1000 mV
Schottky Leakage Current (Both Channels) V
R
= 36V 4 µA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
TOP VIEW
DD PACKAGE
10-LEAD (3mm × 3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
V
POS
SSP
FBP
SSN
FBN
SWP
V
IN
SHDN
SWN
DN
11
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT3472E is guaranteed to meet specified performance from
0°C to 70°C. Specifications over the –40°C to 85°C operating range are
assured by design, characterization and correlation with statistical process
controls.