LT1301 查看數據表（PDF） - Linear Technology

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LT1301

Micropower High Efficiency 5V/12V Step-Up DC/DC Converter for Flash Memory

Linear Technology 

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 0.1µF 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.

BLOCK DIAGRAM

VIN

+

C1

SENSE

4

L1

VIN

2

D1

VOUT

+

C2

SW

7

18mV

A2 CURRENT

R1

COMPARATOR

3Ω

500k

R2

730Ω

1.25V

REFERENCE

97.5k

69.2k

A1

OFF

COMPARATOR

+

ENABLE OSCILLATOR

155kHZ

–

GND SELECT

1

2

SHUTDOWN

3

A3 DRIVER

BIAS

Q2

1×

Q3

Q1

160×

8.5k

ILIM

5

PGND

8

Figure 2.

LT1301 F2

4

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