1.5A, 40V, MAXPower Step-Down

DC-DC Converters

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are

implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.

18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2005 Maxim Integrated Products

Printed USA

is a registered trademark of Maxim Integrated Products, Inc.

COMMON DIMENSIONS

3.35

3.15

T2855-1

3.25

3.35

3.15 3.25

MAX.

3.20

EXPOSED PAD VARIATIONS

3.00

T2055-2

3.10

D2

NOM.

MIN.

3.20

3.00 3.10

MIN.

E2

NOM. MAX.

NE

ND

PKG.

CODES

1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994.

2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES.

3. N IS THE TOTAL NUMBER OF TERMINALS.

4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL

CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE

OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1

IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE.

5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN

0.25 mm AND 0.30 mm FROM TERMINAL TIP.

6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY.

7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION.

8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS.

9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT EXPOSED PAD DIMENSION FOR T2855-1,

T2855-3, AND T2855-6.

NOTES:

SYMBOL

PKG.

N

L1

e

E

D

b

A3

A

A1

k

10. WARPAGE SHALL NOT EXCEED 0.10 mm.

JEDEC

T1655-1

3.20

3.00 3.10

3.00 3.10 3.20

0.70

0.80

0.75

4.90

4.90

0.25

0.25

0

--

4

WHHB

4

16

0.35

0.30

5.10

5.10

5.00

0.80 BSC.

5.00

0.05

0.20 REF.

0.02

MIN.

MAX.

NOM.

16L 5x5

3.10

T3255-2

3.00

3.20 3.00 3.10 3.20

2.70

T2855-2

2.60

2.60

2.80

2.70 2.80

L

0.30

0.50

0.40

--

-

--

-

WHHC

20

5

5

5.00

5.00

0.30

0.55

0.65 BSC.

0.45

0.25

4.90

4.90

0.25

0.65

-

-

5.10

5.10

0.35

20L 5x5

0.20 REF.

0.75

0.02

NOM.

0

0.70

MIN.

0.05

0.80

MAX.

--

-

WHHD-1

28

7

7

5.00

5.00

0.25

0.55

0.50 BSC.

0.45

0.25

4.90

4.90

0.20

0.65

-

-

5.10

5.10

0.30

28L 5x5

0.20 REF.

0.75

0.02

NOM.

0

0.70

MIN.

0.05

0.80

MAX.

--

-

WHHD-2

32

8

8

5.00

5.00

0.40

0.50 BSC.

0.30

0.25

4.90

4.90

0.50

-

-

5.10

5.10

32L 5x5

0.20 REF.

0.75

0.02

NOM.

0

0.70

MIN.

0.05

0.80

MAX.

0.20 0.25 0.30

DOWN

BONDS

ALLOWED

NO

YES

3.10

3.00

3.20

3.10

3.00

3.20

T2055-3

3.10

3.00

3.20

3.10

3.00

3.20

T2055-4

T2855-3

3.15 3.25 3.35 3.15 3.25 3.35

T2855-6

3.15 3.25 3.35 3.15 3.25 3.35

T2855-4

2.60 2.70 2.80 2.60 2.70 2.80

T2855-5

2.60 2.70 2.80 2.60 2.70 2.80

T2855-7

2.60 2.70 2.80 2.60 2.70 2.80

3.20

3.00 3.10

T3255-3

3.20

3.00 3.10

3.20

3.00 3.10

T3255-4

3.20

3.00 3.10

NO

NO

NO

NO

NO

NO

NO

NO

YES

YES

YES

YES

3.20

3.00

T1655-2

3.10

3.00 3.10 3.20

YES

NO

3.20

3.10

3.00

3.10

T1655N-1

3.00

3.20

3.35

3.15

T2055-5

3.25

3.15 3.25 3.35

YES

3.35

3.15

T2855N-1

3.25

3.15 3.25 3.35

NO

3.35

3.15

T2855-8

3.25

3.15 3.25 3.35

YES

3.20

3.10

T3255N-1

3.00

NO

3.20

3.10

3.00

L

0.40

0.40

**

**

**

**

**

**

**

**

**

**

**

**

**

**

**

**

**

**

±0.15

11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY.

H

2

2

21-0140

PACKAGE OUTLINE,

16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm

-DRAWING NOT TO SCALE-

12. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY.

3.30

T4055-1

3.20

3.40 3.20 3.30 3.40

**

YES

0.05

00.02

0.60

0.40 0.50

10

-----

0.30

40

10

0.40 0.50

5.10

4.90 5.00

0.25 0.35 0.45

0.40 BSC.

0.15

4.90

0.25

0.20

5.00 5.10

0.20 REF.

0.70

MIN.

0.75 0.80

NOM.

40L 5x5

MAX.

13. LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION "e", ±0.05.

Package Information (continued)

(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,

go to www.maxim-ic.com/packages.)