Datasheet

SW
SS
FREQ
IN
SW
AGND
COMP
FB
EN
PGND
10-PIN3mmx3mmx1mmQFN
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
I
OUT(max)
Maximum load current vs. Input voltage at High frequency (1.2 MHz) Figure 1
I
OUT(max)
Maximum load current vs. Input voltage at Low frequency (650 kHz) Figure 2
η Efficiency vs. Load current, V
S
= 15 V, V
IN
= 5 V Figure 3
η Efficiency vs. Load current, V
S
= 9 V, V
IN
= 3.3 V 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.
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