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LTC1772

Constant Frequency Current Mode Step-Down DC/DC Controller in SOT-23

Linear Technology 

TYPICAL APPLICATIO

LTC1772 High Efficiency, Small Footprint 3.3V to 1.8V/0.5A Regulator

R4

10k

C3

220pF

1

6

ITH/RUN PGATE

LTC1772

2

GND

3

VFB

5

VIN

SENSE– 4

R1

0.15Ω

L1

M1 10µH

+

D1

C1

10µF

10V

C2

47µF

6V

VIN

3.3V

VOUT

1.8V

0.5A

R2

100k

C1: TAIYO YUDEN CERAMIC

LMK325BJ106K-T

C2: SANYO POSCAP 6TPA47M

D1: MOTOROLA MBRM120T3

L1: COILTRONICS UP1B-100

M1: Si3443DV

R1: DALE 0.25W

R3

80.6k

1772 TA02

PACKAGE DESCRIPTION

S6 Package

6-Lead Plastic TSOT-23

(Reference LTC DWG # 05-08-1636)

0.62

0.95

MAX

REF

1.22 REF

2.90 BSC

(NOTE 4)

3.85 MAX 2.62 REF

1.4 MIN

2.80 BSC

1.50 – 1.75

(NOTE 4)

PIN ONE ID

LTC1772

RECOMMENDED SOLDER PAD LAYOUT

PER IPC CALCULATOR

0.20 BSC

DATUM ‘A’

0.95 BSC

0.80 – 0.90

1.00 MAX

0.30 – 0.50 REF

0.09 – 0.20

NOTE:

(NOTE 3)

1. DIMENSIONS ARE IN MILLIMETERS

2. DRAWING NOT TO SCALE

3. DIMENSIONS ARE INCLUSIVE OF PLATING

4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR

5. MOLD FLASH SHALL NOT EXCEED 0.254mm

6. JEDEC PACKAGE REFERENCE IS MO-193

1.90 BSC

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

0.30 – 0.45

6 PLCS (NOTE 3)

0.01 – 0.10

S6 TSOT-23 0302

1772fb

11

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