Datasheet

PIN ASSIGNMENT
SW
SS
MODE
IN
SW
AGND
COMP
FB
EN
PGND
10-PIN3mmx3mmx1mmQFN
Thermal
Pad
TYPICAL CHARACTERISTICS
TABLE OF GRAPHS
TPS61086
SLVSA05 – AUGUST 2009 ................................................................................................................................................................................................ www.ti.com
DRC PACKAGE
(TOP VIEW)
TERMINAL FUNCTIONS
TERMINAL
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
MODE 9 I Operating mode selection pin. MODE = ' high ' for forced PWM operation. MODE = ' low ' for PFM operation
SS 10 Soft-start control pin. Connect a capacitor to this pin if soft-start needed. Open = no soft-start
FIGURE
η Efficiency vs Load current- PFM V
IN
= 3.3 V, V
S
= 9 V, 12 V, 15 V Figure 1
η Efficiencyvs Load current - Forced PWM V
IN
= 3.3 V, V
S
= 9 V, 12 V, 15 V Figure 2
PFM switching 1 - discontinuous conduction V
IN
= 3.3 V, V
S
= 12 V, I
out
= 50 mA Figure 3
PFM switching 1 - discontinuous conduction V
IN
= 3.3 V, V
S
= 12 V, I
out
= 50 mA Figure 4
PFM switching - discontinuous conduction V
IN
= 3.3 V, V
S
= 12 V, I
out
= 4 mA Figure 5
Forced PWM switching - discontinuous V
IN
= 3.3 V, V
S
= 12 V, I
out
= 4 mA Figure 6
conduction
PFM / PWM switching - continuous conduction V
IN
= 3.3 V, V
S
= 12 V, I
out
= 300 mA Figure 7
I
out(max)
Maximum output current Figure 8
Load transient response - PFM V
IN
= 3.3 V, V
S
= 12 V, I
out
= 50 mA...150 Figure 9
mA
Load transient response - Forced PWM V
IN
= 3.3 V, V
S
= 1 2V, I
out
= 50 mA...150 Figure 10
mA
Line transient response - PFM V
IN
= 2.3 V...6.0 V, V
S
= 12 V, I
out
= 0 mA Figure 11
Line transient response - Forced PWM V
IN
= 2.3 V...6.0 V, V
S
= 12 V, I
out
= 150 mA Figure 12
f
S
Switching frequency - Forced PWM vs Load current, V
IN
= 3.3 V, V
S
= 12 V Figure 13
f
S
Switching frequency - Forced PWM vs Supply voltage, V
S
= 12 V, I
out
= 200 mA Figure 14
Soft-start Figure 15
Supply current vs Supply voltage,V
IN
= 3.3 V, V
S
= 12 V Figure 16
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