Datasheet

LT1073
2
Supply Voltage, Step-Up Mode................................ 15V
Supply Voltage, Step-Down Mode ........................... 36V
SW1 Pin Voltage...................................................... 50V
SW2 Pin Voltage........................................... –0.4 to V
IN
Feedback Pin Voltage (LT1073) ................................. 5V
Switch Current........................................................ 1.5A
Maximum Power Dissipation ............................. 500mW
Operating Temperature Range ..................... 0°C to 70°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
T
JMAX
= 125°C, θ
JA
= 100°C/W (N8)
T
JMAX
= 125°C, θ
JA
= 120°C/W (S8)
Consult factory for parts specified with wider operating temperature ranges.
LT1073CN8
LT1073CN8-5
LT1073CN8-12
LT1073CS8
LT1073CS8-5
LT1073CS8-12
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
= 1.5V unless otherwise specified.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current Switch Off ● 95 130 µA
I
Q
Quiescent Current, Step-Up No Load LT1073-5 135 µA
Mode Configuration LT1073-12 250 µA
V
IN
Input Voltage Step-Up Mode ● 1.15 12.6 V
1.0 12.6 V
Step-Down Mode ● 30 V
Comparator Trip Point Voltage LT1073 (Note 2) ● 202 212 222 mV
V
OUT
Output Sense Voltage LT1073-5 (Note 3) ● 4.75 5 5.25 V
LT1073-12 (Note 3)
● 11.4 12 12.6 V
Comparator Hysteresis LT1073 ● 510 mV
Output Hysteresis LT1073-5 ● 125 250 mV
LT1073-12
● 300 600 mV
f
OSC
Oscillator Frequency ● 15 19 23 kHz
DC Duty Cycle Full Load (V
FB
= V
REF
) ● 65 72 80 %
t
ON
Switch ON Time ● 30 38 50 µs
I
FB
Feedback Pin Bias Current LT1073, V
FB
= 0V ● 10 50 nA
I
SET
Set Pin Bias Current V
SET
= V
REF
● 60 120 nA
V
AO
AO Output Low I
AO
= –100µA ● 0.15 0.4 V
Reference Line Regulation 1V ≤ V
IN
≤ 1.5V ● 0.35 1.0 %V
1.5V ≤ V
IN
≤ 12V ● 0.05 0.1 %V
V
CESAT
Switch Saturation Voltage V
IN
= 1.5V, I
SW
= 400mA 300 400 mV
Set-Up Mode
● 600 mV
V
IN
= 1.5V, I
SW
= 500mA 400 550 mV
● 750 mV
V
IN
= 5V, I
SW
= 1A 700 1000 mV
● 1500 mV
A
V
A2 Error Amp Gain R
L
= 100kΩ (Note 4) ● 400 1000 V/V
1
2
3
4
8
7
6
5
TOP VIEW
I
LIM
V
IN
SW1
SW2
FB (SENSE)*
SET
A0
GND
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSIONS
S8 PART MARKING
1073
10735
107312