Datasheet

PowerPAD
(17)
16
SS
EN
VIN
SW
FREQ
NC
PGND
PGND
SW
SW
NC
PGND
SYNC
AGND
COMP
FB
15 14 13
5
6 7 8
1
2
3
4
12
11
10
9
1
7
6
5
4
3
2
14
8
9
10
11
12
13
SW
SW
VIN
EN
SS
SYNC
AGND
PGND
PGND
NC
FREQ
FB
COMP
PGND
PowerPAD
(15)
TPS55340
SLVSBD4B –MAY 2012–REVISED OCTOBER 2012 www.ti.com
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
ORDERING INFORMATION
(1)
T
J
PART NUMBER PACKAGE
TPS55340RTE QFN-16
-40°C to 150°C
TPS55340PWP HTSSOP-14
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
PIN ASSIGNMENTS
QFN-16 PACKAGE
HTSSOP-14 PACKAGE
(Top View)
(Top View)
PIN FUNCTIONS
PIN
DESCRIPTION
NO.
NAME
QFN-16 HTSSOP-14
VIN 2 3 The input supply pin to the IC. Connect VIN to a supply voltage between 2.9V and 32V. It is acceptable for the
voltage on the pin to be different from the boost power stage input.
SW 1, 15, 16 1, 2 SW is the drain of the internal power MOSFET. Connect SW to the switched side of the boost or SEPIC inductor or
the flyback transformer.
FB 8 9 Error amplifier input and feedback pin for positive voltage regulation. Connect to the center tap of a resistor divider
to program the output voltage.
EN 3 4 Enable pin. When the voltage of this pin falls below the enable threshold for more than 1ms, the IC turns off.
COMP 7 8 Output of the transconductance error amplifier. An external RC network connected to this pin compensates the
regulator feedback loop.
SS 4 5 Soft-start programming pin. A capacitor between the SS pin and AGND pin programs soft-start timing.
FREQ 9 10 Switching frequency program pin. An external resistor connected between the FREQ pin and AGND sets the
switching frequency.
AGND 6 7 Signal ground of the IC.
PGND 11, 12, 13 12, 13, 14 Power ground of the IC. It is connected to the source of the internal power MOSFET switch.
SYNC 5 6 Switching frequency synchronization pin. An external clock signal can be used to set the switching frequency
between 200kHz and 1.0MHz. If not used, this pin should be tied to AGND.
NC 10, 14 11 Reserved pin that must be connected to ground.
PowerPAD 17 15 The PowerPAD should be soldered to the AGND. If possible, use thermal vias to connect to internal ground plane
for improved power dissipation.
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