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LT1301 Fiches technique(PDF) 4 Page - Linear Technology

No de pièce LT1301
Description  Micropower High Efficiency 5V/12V Step-Up DC/DC Converter for Flash Memory
Download  12 Pages
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Fabricant  LINER [Linear Technology]
Site Internet  http://www.linear.com
Logo LINER - Linear Technology

LT1301 Fiches technique(HTML) 4 Page - Linear Technology

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4
LT1301
PIN FUNCTIONS
GND (Pin 1): Signal Ground. Tie to PGND under the
package.
Sel (Pin 2): Output Select. When tied to VIN converter
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
µF ceramic capaci-
tor is required from Sense to Ground.
ILIM (Pin 5): Float for 1A switch current limit. Tie to ground
for approximately 400mA. A resistor between ILIM and
ground sets peak current to some intermediate value .
VIN (Pin 6): Supply Pin. Must be bypassed with a large
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 VIN should be
tied directly to PGND within 0.2" of the device.
Figure 2.
BLOCK DIAGRAM
OSCILLATOR
155kHZ
R2
730
C2
SW
R1
3
Q2
1
×
Q1
160
×
18mV
OFF
VIN
VIN
ILIM
PGND
VOUT
ENABLE
A1
COMPARATOR
+
+
+
+
1.25V
REFERENCE
L1
D1
7
2
4
SENSE
A2 CURRENT
COMPARATOR
A3 DRIVER
BIAS
Q3
8.5k
58
SHUTDOWN
3
SELECT
2
GND
69.2k
97.5k
500k
C1
1
LT1301 F2


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