SW

SS

FREQ

IN

SW

AGND

COMP

FB

EN

PGND

10-PIN3mmx3mmx1mmQFN

Thermal

Pad

TPS61087

SLVS821C – MAY 2008 – REVISED JULY 2013

www.ti.com

PIN ASSIGNMENT

DRC, DSC PACKAGE

(TOP VIEW)

PIN FUNCTIONS

PIN

I/O

DESCRIPTION

NAME

NO.

COMP

1

I/O

Compensation pin

FB

2

I

Feedback pin

EN

3

I

Shutdown control input. Connect this pin to logic high level to enable the device

AGND

4,

Analog ground

Thermal

Pad

PGND

5

Power ground

SW

6, 7

Switch pin

IN

8

Input supply pin

FREQ

9

I

Frequency select pin. The power switch operates at 650 kHz if FREQ is connected to GND and at 1.2 MHz

if FREQ is connected to IN

SS

10

Soft-start control pin. Connect a capacitor to this pin if soft-start needed. Open = no soft-start

TABLE OF GRAPHS

FIGURE

Maximum load current

vs. Input voltage at High frequency (1.2 MHz)

Figure 1

Maximum load current

vs. Input voltage at Low frequency (650 kHz)

Figure 2

η

Efficiency

Figure 3

η

Efficiency

Figure 4

PWM switching - discontinuous conduction

Figure 5

PWM switching - continuous conduction

Figure 6

Load transient response

at High frequency (1.2 MHz)

Figure 7

Load transient response

at Low frequency (650 kHz)

Figure 8

Soft-start

Figure 9

Supply current

vs. Supply voltage

Figure 10

Oscillator frequency

vs. Load current

Figure 11

Oscillator frequency

vs. Supply voltage

Figure 12

The typical characteristics are measured with the inductors 7447789003 3.3 µH (high frequency) or 74454068

6.8 µH (low frequency) from Wurth and the rectifier diode SL22.

4

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