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LT1300 Datasheet(PDF) 4 Page - Linear Technology

Part No. LT1300
Description  Micropower High Efficiency 3.3/5V Step-Up DC/DC Converter
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LT1300 Datasheet(HTML) 4 Page - Linear Technology

   
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LT1300
PIN FUNCTIONS
GND (Pin 1): Signal Ground.
Sel (Pin 2): Output Select. When tied to VIN or VOUT
converter regulates at 5V. When grounded converter
regulates at 3.3V.
SHDN (Pin 3): Shutdown. Pull high to effect shutdown. Tie
to ground for normal operation.
Sense (Pin 4): “Output” Pin.
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 (see
Figure 5).
VIN (Pin 6): Supply Pin. Must be bypassed with a large
value electrolytic to ground. A 0.1
µF ceramic capacitor
close to the pin may be needed in some cases.
SW (Pin 7): Switch Pin. Connect inductor and diode here.
Keep layout short and direct to minimize electronic radia-
tion.
PGND (Pin 8): Power Ground. Tie to signal ground (pin 1)
under the package. Bypass capacitor from VIN should be
tied directly to the pin.
Figure 1.
BLOCK DIAGRAM
OSCILLATOR
155kHZ
R2
730
C2
SW
R1
3
Q2
1x
Q1
160x
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
161k
144k
500k
C1
1
LT1300 F1


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