VIN

VIN

EN

BOOST

SW

FB

GND

VOUT

C3

L1

C2

R1

R2

D1

D2

ON

OFF

C1

R3

VIN

BOOST

SW

GND

L

D1

D2

D3

R3

C4

VBOOST

CBOOST

VZ

VIN

CIN

COUT

VOUT

LM2736

www.ti.com

SNVS316H – SEPTEMBER 2004 – REVISED DECEMBER 2014

Application Information (continued)

Figure 14. Boost Voltage Supplied from the Shunt Zener on VIN

8.2 Typical Applications

8.2.1 LM2736X (1.6 MHz) VBOOST Derived from VIN 5 V to 1.5 V / 750 mA

Figure 15. LM2736X (1.6 MHz) VBOOST Derived from VIN 5 V to 1.5 V / 750 mA

8.2.1.1 Design Requirements

Derive charge for VBOOST from the input supply (VIN). VBOOST – VSW should not exceed the maximum operating

limit of 5.5 V.

8.2.1.2 Detailed Design Procedures

Table 1. Bill of Materials for Figure 15

PART ID

PART VALUE

PART NUMBER

MANUFACTURER

U1

750 mA Buck Regulator

LM2736X

TI

C1, Input Cap

10-µF, 6.3V, X5R

C3216X5ROJ106M

TDK

C2, Output Cap

10-µF, 6.3V, X5R

C3216X5ROJ106M

TDK

C3, Boost Cap

0.01-uF, 16V, X7R

C1005X7R1C103K

TDK

D1, Catch Diode

0.3 VF Schottky 1 A, 10 VR

MBRM110L

ON Semi

D2, Boost Diode

1 VF @ 50 mA Diode

1N4148W

Diodes, Inc.

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