VIN

EN

LM2775

GND

VOUT

C1+

C1-

10 2F

10 2F

PFM

OUTDIS

1 2F

Battery

Controller

System

5V @ 200mA

LM2775

SNVSA57 – MAY 2015

www.ti.com

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM2775 can create a 5-V system rail capable of delivering up to 200 mA of output current to the load. The 2-

MHz switched capacitor boost allows for the use of small value discrete external components.

8.2 Typical Application

Figure 19. Typical LM2775 Configuration

8.2.1 Design Requirements

DESIGN PARAMETER

EXAMPLE VALUE

Input voltage range

2.7 V to 5.5 V

Output current range

8.2.2 Detailed Design Procedure

8.2.2.1 Output Current Capability

The LM2775 provides 200 mA of output current when the input voltage is within 3.1 V to 5.5 V.

NOTE

Understanding relevant application issues is recommended and a thorough analysis of the

application circuit should be performed when using the part outside operating ratings

and/or specifications to ensure satisfactory circuit performance in the application. Special

care should be paid to power dissipation and thermal effects. These parameters can have

a dramatic impact on high-current applications, especially when the input voltage is high.

(see the Power Dissipation section).

The schematic of Figure 20 is a simplified model of the LM2775 that is useful for evaluating output current

capability. The model shows a linear pre-regulation block (Reg), a voltage doubler (2×), and an output resistance

output resistance of the LM2775 is 3.5

Ω (typical) and is approximately equal to twice the resistance of the four

LM2775 switches. When the output voltage is in regulation, the regulator in the model controls the voltage V' to

12

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