LT1305CS8 Linear Technology, LT1305CS8 Datasheet - Page 4

• Manufacturer Part Number: LT1305CS8
• Description: IC DC/DC CONV STP-UP MCRPWR8SOIC
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LT1305CS8

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V
• Current - Output: 400mA
• Frequency - Switching: 155kHz
• Voltage - Input: 1.8 ~ 10 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Power - Output: 500mW
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PI FU CTIO S
LT1305
TYPICAL PERFORMANCE CHARACTERISTICS
GND (Pin 1): Signal Ground. Tie to PGND under the
package.
LBO (Pin 2): Open-Collector Output of Comparator C3.
Can sink 100 A. High impedance when device is in shut-
down.
SHDN (Pin 3): Shutdown. Pull high to shut down the
LT1305. Ground for normal operation.
FB (Pin 4): Feedback Input. Connects to main comparator
C1 input.
4
1.250
1.245
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.200
1.205
U
–50
Low-Battery Detect Trip Point
–25
U
TEMPERATURE ( C)
0
25
U
50
W
75
LT1305 • G10
U
100
400
350
300
250
200
150
100
50
0
Switch Saturation Voltage
0
T
A
0.2
= 25 C
0.4
SWITCH CURRENT (A)
0.6
0.8
1.0
LBI (Pin 5): Low-Battery Comparator Input. When voltage
on this pin is below 1.24V, LBO is low.
V
value capacitor to gound. Keep bypass within 0.2" of the
device.
SW (Pin 7): Switch Pin. Connect inductor and diode here.
Keep layout short and direct to minimize radio frequency
interference.
PGND (Pin 8): Power Ground. Tie to signal ground (pin 1)
under the package. Bypass capacitor from V
tied directly to PGND within 0.2" of the device.
IN
1.2
(Pin 6): Supply Pin. Must be bypassed with a large
1.4
1.6
LT1305 • F12
1.8
2.0
300
250
200
150
100
50
0
– 50
Switch Saturation Voltage
I
SW
= 1A
– 25
TEMPERATURE ( C)
0
25
IN
50
should be
75
LT1305 • G13
100