LT1301CS8#TR Linear Technology, LT1301CS8#TR Datasheet - Page 4

• Manufacturer Part Number: LT1301CS8#TR
• Description: IC CONV DC/DC STEPUP HIEFF 8SOIC
• Manufacturer: Linear Technology
• Type: Step-Up (Boost)r

Specifications of LT1301CS8#TR

• Internal Switch(s): Yes
• Synchronous Rectifier: No
• Number Of Outputs: 1
• Voltage - Output: 5V, 12V
• 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
• Current - Output: -

BLOCK
LT1301
PIN
GND (Pin 1): Signal Ground. Tie to PGND under the
package.
Sel (Pin 2): Output Select. When tied to V
regulates at 12V. When grounded or floating converter
regulates at 5V. May be driven under logic control.
SHDN (Pin 3): Shutdown. Pull high to shut down the
LT1301. Ground for normal operation.
Sense (Pin 4): “Output” Pin. Goes to internal resistive
divider. If operating at 5V output, a 0.1 F ceramic capaci-
tor is required from Sense to Ground.
I
4
LIM
U
(Pin 5): Float for 1A switch current limit. Tie to ground
FUNCTIONS
V
IN
+
U
C1
DIAGRAM
REFERENCE
1.25V
U
W
4
1
GND
SENSE
97.5k
69.2k
500k
2
SELECT
+
–
A1
COMPARATOR
IN
converter
ENABLE
Figure 2.
SHUTDOWN
OSCILLATOR
2
155kHZ
3
V
IN
for approximately 400mA. A resistor between I
ground sets peak current to some intermediate value .
V
value electrolytic to ground. 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.
OFF
IN
COMPARATOR
A2 CURRENT
(Pin 6): Supply Pin. Must be bypassed with a large
A3 DRIVER
BIAS
L1
+
–
5
Q3
8.5k
730
18mV
I
R2
LIM
Q2
1
3
R1
7
8
Q1
160
PGND
SW
D1
LT1301 F2
IN
V
+
should be
OUT
C2
LIM
and