TS30012 Datasheet, PDF (14/18 Pages) List of Unclassifed Manufacturers – High Efficiency 1A/2A/3A Current-Mode Synchronous Buck DC/DC Converter, 1MHz

TS30011/12/13
Version 1.6
RTOP
Voltage Feedback Resistor
(optional)
17.8K
(Note 1)
1
RBOT
Voltage Feedback Resistor
(optional)
10K
(Note 1)
1
RPLP
PG Pin Pull-up Resistor
(optional)
10K
1
DCATCH
Catch Diode (optional, 1A)
30V 2A
SOD-123FL
On
Semiconductor
MBR230LSFT1G
1
DCATCH
Catch Diode (optional, 2A)
40V 3A
SOD-123
NXP
Semiconductors
PMEG4030ER,115
1
DCATCH
Catch Diode (optional, 3A)
40V 5A
NXP
SOD-123FL Semiconductors
PMEG4050EP,1
1
Note 1: The voltage divider resistor values are calculated for an output voltage of 2.5V. For fixed output versions, the FB pin is connected directly to VOUT.
EXTERNAL COMPONENT SELECTION
The 1MHz internal switching frequency of the TS30011/12/13 facilitates low cost LC filter combinations. Additionally, the fixed
output versions enable a minimum external component count to provide a complete regulation solution with only 4 external
components: an input bypass capacitor, an inductor, an output capacitor, and the bootstrap capacitor. The internal
compensation is optimized for a 44uF output capacitor and a 4.7uH inductor.
For best performance, a low ESR ceramic capacitor should be used for CBYPASS. If CBYPASS is not a low ESR ceramic capacitor, a
0.1uF ceramic capacitor should be added in parallel to CBYPASS.
The minimum allowable value for the output capacitor is 33uF. To keep the output ripple low, a low ESR (less than 35mOhm)
ceramic is recommended. Multiple capacitors can be paralleled to reduce the ESR.
The inductor range is 4.7uH +/-20%. For optimal over-current protection, the inductor should be able to handle up to the
regulator current limit without saturation. Otherwise, an inductor with a saturation current rating higher than the maximum
IOUT load requirement plus the inductor current ripple should be used.
For high current modes, the optional Schottky diode will improve the overall efficiency and reduce the heat. It is up to the user
to determine the cost/benefit of adding this additional component in the user’s application. The diode is typically not needed.
For the adjustable output version of the TS30011/12/13, the output voltage can be adjusted by sizing RTOP and RBOT feedback
resistors. The equation for the output voltage is
Vout


0.9

^1


R_TOP
R_BOT




.
For the adjustable version, the ratio of VCC/Vout cannot exceed 16.
RPUP is only required when the Power Good signal (PG) is utilized.
THERMAL INFORMATION
TS30011/12/13 is designed for a maximum operating junction temperature Tj of 125°C. The maximum output power is limited
by the power losses that can be dissipated over the thermal resistance given by the package and the PCB structures. The PCB
must provide heat sinking to keep the TS30011/12/13 cool. The exposed metal on the bottom of the QFN package must be
soldered to a ground plane. This ground should be tied to other copper layers below with thermal vias. Adding more copper to
the top and the bottom layers and tying this copper to the internal planes with vias can reduce thermal resistance further. For a
Specifications subject to change
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