VIN

VIN

EN

BOOST

SW

FB

GND

VOUT

C3

L1

C2

R1

R2

D1

D2

ON

OFF

C1

R3

LM2736

SNVS316H – SEPTEMBER 2004 – REVISED DECEMBER 2014

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8.2.6 LM2736Y (550 kHz) VBOOST Derived from VIN 5 V to 1.5 V / 750 mA

Figure 26. LM2736Y (550 kHz) VBOOST Derived from VIN 5 V to 1.5 V / 750 mA

8.2.6.1 Design Requirements

Derive charge for VBOOST from the input voltage, (VIN). VBOOST should be greater than 2.5 V above VSW for best

efficiency. VBOOST – VSW should not exceed the maximum operating limit of 5.5 V.

8.2.6.2 Detailed Design Procedure

Table 6. Bill of Materials for Figure 26

PART ID

PART VALUE

PART NUMBER

MANUFACTURER

U1

750mA Buck Regulator

LM2736Y

TI

C1, Input Cap

10µF, 6.3V, X5R

C3216X5ROJ106M

TDK

C2, Output Cap

22µF, 6.3V, X5R

C3216X5ROJ226M

TDK

C3, Boost Cap

0.01µF, 16V, X7R

C1005X7R1C103K

TDK

D1, Catch Diode

0.3VF Schottky 1A, 10VR

MBRM110L

ON Semi

D2, Boost Diode

1VF @ 50mA Diode

1N4148W

Diodes, Inc.

L1

10µH, 1.6A,

SLF7032T-100M1R4

TDK

R1

2k

Ω, 1%

CRCW06032001F

Vishay

R2

10k

Ω, 1%

CRCW06031002F

Vishay

R3

100k

Ω, 1%

CRCW06031003F

Vishay

Please refer toDetailed Design Procedures.

8.2.6.3 Application Curves

Please refer to Application Curves.

22

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