2
LT1302/LT1302-5
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
V
IN
Voltage ............................................................. 10V
SW Voltage ............................................................. 25V
FB Voltage .............................................................. 10V
SHDN Voltage ......................................................... 10V
V
C
Voltage ................................................................ 4V
I
T
Voltage.................................................................. 4V
Maximum Power Dissipation ............................ 700mW
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ............... – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
Consult factory for Industrial and Military grade parts.
ORDER PART
NUMBER
LT1302CN8
LT1302CS8
LT1302CN8-5
LT1302CS8-5
S8 PART MARKING
1302
13025
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
Q
Quiescent Current V
SHDN
= 0.5V, V
FB
= 1.3V ● 200 300 µA
V
SHDN
= 1.8V ● 15 25 µA
V
IN
Input Voltage Range 2.0 V
● 2.2 8 V
V
FB
Feedback Voltage (LT1302) V
C
= 0.4V ● 1.22 1.24 1.26 V
Feedback Pin Bias Current (LT1302) V
FB
= 1V 100 nA
Output Sense Voltage (LT1302-5) V
C
= 0.4V ● 4.85 5.05 5.25 V
Output Ripple Voltage (LT1302-5) V
C
= 0.4V 50 mV
Sense Pin Resistance to Ground (LT1302-5) 420 kΩ
V
OS
Offset Voltage See Block Diagram 15 mV
Comparator Hysteresis (Note 1) 5 mV
Oscillator Frequency Current Limit Not Asserted (Note 2) 175 220 265 kHz
● 160 310 kHZ
DC Maximum Duty Cycle 75 86 95 %
t
ON
Switch On Time Current Limit Not Asserted 3.9 µs
t
OFF
Switch Off Time 0.7 µs
Output Line Regulation 2 < V
IN
< 8V ● 0.06 0.15 %/V
V
CESAT
Switch Saturation Voltage I
SW
= 2A 310 400 mV
● 475 mV
Switch Leakage Current V
SW
= 5V, Switch Off ● 0.1 10 µA
Switch Current Limit V
C
= 0.4V (Burst Mode Operation) 1 A
V
C
= 1.25V (Full Power) (Note 3) ● 2.0 2.8 3.9 A
Error Amplifier Voltage Gain 0.9V ≤ V
C
≤ 1.2V, ∆V
C
/∆V
FB
50 75 V/V
V
SHDNH
Shutdown Pin High ● 1.8 V
V
SHDNL
Shutdown Pin Low ● 0.5 V
I
SHDN
Shutdown Pin Bias Current V
SHDN
= 5V ● 820 µA
V
SHDN
= 2V 3 µA
V
SHDN
= 0V ● 0.1 1 µA
I
T
Pin Resistance to Ground 3.9 kΩ
T
A
= 25°C, V
IN
= 2.5V, unless otherwise noted.
E
LECTR
IC
AL C CHARA TERIST
ICSCD
The ● denotes specifications which apply over the 0°C to 70°C
temperature range.
Note 1: Hysteresis is specified at DC. Output ripple depends on capacitor
size and ESR.
Note 2: The LT1302 operates in a variable frequency mode. Switching
frequency depends on load inductance and operating conditions and may
be above specified limits.
Note 3: Minimum switch current 100% tested. Maximum switch current
guaranteed by design.
1
2
3
4
8
7
6
5
TOP VIEW
GND
V
C
SHDN
(SENSE*)FB
PGND
SW
V
IN
I
T
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
*FIXED VERSION
PINS 1 AND 8 ARE INTERNALLY
CONNECTED IN SOIC PACKAGE
T
JMAX
= 125°C, θ
JA
= 100°C/W (N8)
T
JMAX
= 125°C, θ
JA
= 80°C/W (S8)
