NPO5DB4R7M datasheet(10/14 Pages) ANALOGICTECH

Part #	NPO5DB4R7M

Description	1MHz 1.2A Buck DC/DC Converter

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Manufacturer	ANALOGICTECH [Advanced Analogic Technologies]

Direct Link	http://www.analogictech.com

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10 / 14 page

AAT1157

1MHz 1.2A Buck DC/DC Converter

10

1157.2005.11.1.4

Where I

Q is the AAT1157 quiescent current.

Once the total losses have been determined, the

junction temperature can be derived from the

θ

JA for

the QFN package. Close attention should be paid to

the proper layout for the QFN package. Proper size

and placement of thermal routing vias below the

central paddle is necessary for good heat transfer to

other PCB layers and their ground planes. The

θ

JA

for the QFN package with no connection to the cen-

tral paddle is 50°C/W. The actual

θ

JA will vary with

the number and type of vias. The PCB board size,

number of board layers, and ground plane charac-

teristics also influence the

θ

JA. A good thermal con-

nection from the paddle to the PCB ground plane

layers can significantly reduce

θ

JA.

Adjustable Output

Resistors R3 and R4, as shown in Figure 1, force

the output to regulate higher than the 0.6V refer-

ence voltage level. The optimum value for R4 is

59k

Ω. Values higher than this can cause stability

problems, while lower values can degrade light

load efficiency. For a 2.5V output with R4 set to

59k

Ω, R3 is 187kΩ.

Table 1: Suggested Component Values.

Buck-Boost Output

Figure 4 shows how to configure the AAT1157 in a

buck boost configuration with an external MOSFET

and Schottky diode.

The converter has a 3.3V

600mA output with an input voltage ranging from

2.7V to 5.5V.

Output

R3 for

Voltage

L1

Capacitor

R4 = 59k

Ω

(V)

(µH)

(C3-C4) (µF)

(k

Ω

Ω)

0.8

1.5 - 2.6

3x 22

19.6

1.0

1.5 - 3.3

2x 22

39.2

1.2

2.2 - 3.3

2x 22

59

1.5

2.2 - 4.7

2x 22

88.7

1.8

3.0 - 4.7

2x 22

118

2.5

3.0 - 4.7

2x 22

187

3.3

2.2 - 4.7

22

267

⎛⎞

⎝⎠

R3 =

-1 · R4 =

- 1 · 59k

Ω = 187kΩ

V

O

V

REF

⎛⎞

⎝⎠

2.5V

0.6V

T

J = P ·

Θ

JA + TAMB

I

O

2

⋅ (R

DSON(HS)

⋅ V

O + RDSON(LS)

⋅ (V

IN - VO))

P =

V

IN

+ (t

sw

⋅ F ⋅ I

O

⋅ V

IN + IQ)

⋅ V

IN

Figure 4: AAT1157 Buck Boost Converter.

3.0

µH

L1

22

µF

C1

100

R1

0.1

µF

C2

C1 Murata 22

µF 10V X7R 1210 GRM32ER71A226KE20L

C3,C4 MuRata 22

µF 6.3V X5R 0805 GRM21BR60J226ME39L

L1 Sumida CDRH5D28-3R0

LX

14

N/C

6

EN

7

VCC

9

VP

10

N/C

8

LX

13

PGND

3

VP

12

VP

11

OUT

4

LX

15

2

1

SGND

5

N/C

16

AAT1157

U1

267k

R2

59.0k

R3

Si2302ADS

Q1

MBRM120L

D1

2x 22

µF

C3,C4

VIN 2.7V to 5.5V

VO 3.3V/600mA

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