TS30021 Datasheet, PDF (14/19 Pages) List of Unclassifed Manufacturers – High Efficiency 1A/2A/3A Current-Mode Synchronous Buck DC/DC Converter, 2MHz and 470mA LDO

TS30021/22/23
Version 1.5
For fixed output voltage versions of the TS30021/22/23, RBOTSW and RTOPSW are not required and the FB pin should be
connected directly to the Vout.
PCB layout for the LDO should follow the same approach and guidelines as given above.
The exposed thermal pad must be soldered to the PCB for mechanical reliability and to achieve good power dissipation. Vias
must be placed under the pad to transfer the heat to the ground plane.
EXTERNAL COMPONENT BILL OF MATERIALS
Designator Function
Description
Suggested
Manufacturer
Manufacturer Code
Qty
CBYPASS
Input Supply Bypass
Capacitor
10uF 10%
35V
TDK
CGA5L3X5R1V106K160AB
1
CBYPASS-LDO
Input Supply Bypass
Capacitor
10uF 10%
35V
TDK
CGA5L3X5R1V106K160AB
1
COUT
Output Filter Capacitor
22uF 10%
10V
TDK
C2012X5R1A226K125AB
1
COUT_LDO LDO Output Filter Capacitor
1uF
1
LOUT
Output Filter Inductor (1A)
1.5uH 2A
TDK
Wurth
1
LOUT
Output Filter Inductor (2A)
1.5uH 3A
TDK
Wurth
1
LOUT
Output Filter Inductor (3A) 1.5uH 4.37A
TDK
Wurth
1
CBST
Boost Capacitor
22nF 10V
TDK
C1005X7R1C223K
1
RTOPSW &
RTOP
Voltage Feedback Resistor
(RTOPSW optional)
17.8K
(Note 1)
1
RBOTSW &
RBOT
Voltage Feedback Resistor
(RBOTSW 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 2MHz internal switching frequency of the TS30021/22/23 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 22uF output capacitor and a 1.5uH inductor.
Specifications subject to change
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