TPS62270, TPS62272
TPS62273
www.ti.com ........................................................................................................................................... SLVS799C – NOVEMBER 2007 – REVISED JANUARY 2009
2.25 MHz 400-mA Step Down Converter With Selectable VOUT
FEATURES
1
• High Efficiency Step Down Converter
• Output Current up to 400 mA
• VIN Range From 2V to 6V for Li-Ion Batteries
With Extended Voltage Range
• 2.25 MHz Fixed Frequency Operation
• Pin-Selectable Fixed Output Voltage
• Power Save Mode for Highest Efficiency
• Automatic transition between PFM and PWM
Mode
• Voltage Positioning in PFM Mode
• Typical 15-µA Quiescent Current
• 100% Duty Cycle for Lowest Dropout
• Available in 2×2×0,8 mm SON Package
• Allows 4.5V. The input capacitor can be increased without any limit for better
input voltage filtering. Take care when using only small ceramic input capacitors. When a ceramic capacitor is
used at the input and the power is being supplied through long wires, such as from a wall adapter, a load step at
the output or VIN step on the input can induce ringing at the VIN pin. This ringing can couple to the output and
be mistaken as loop instability or could even damage the part by exceeding the maximum ratings.
Table 3. List of Capacitors
16
CAPACITANCE
TYPE
SIZE mm3
SUPPLIER
4.7 µF
GRM188R60J475K
0603: 1.6 × 0.8 × 0.8 mm3
Murata
10 µF
GRM188R60J106M69D
0603: 1.6 × 0.8 × 0.8 mm3
Murata
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Copyright © 2007–2009, Texas Instruments Incorporated
Product Folder Link(s): TPS62270 TPS62272 TPS62273
TPS62270, TPS62272
TPS62273
www.ti.com ........................................................................................................................................... SLVS799C – NOVEMBER 2007 – REVISED JANUARY 2009
LAYOUT CONSIDERATIONS
As for all switching power supplies, the layout is an important step in the design. Proper function of the device
demands careful attention to PCB layout. Care must be taken in board layout to get the specified performance. If
the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well
as EMI problems. It is critical to provide a low inductance, impedance ground path. Therefore, use wide and
short traces for the main current paths. The input capacitor should be placed as close as possible to the IC pins
as well as the inductor and output capacitor.
Connect the GND Pin of the device to the PowerPad™ of the PCB and use this pad as a star point. Use a
common Power GND node and a different node for the Signal GND to minimize the effects of ground noise.
Connect these ground nodes together to the PowerPad™ (star point) underneath the IC. Keep the common path
to the GND PIN, which returns the small signal components and the high current of the output capacitors as
short as possible to avoid ground noise. The FB line should be connected right to the output capacitor and routed
away from noisy components and traces (e.g., SW line).
COUT
VOUT
U1
GND
3.3mm
VIN CIN
L1
Total area
21.5 mm²
6.5 mm
Figure 26. Suggested Board Layout
Copyright © 2007–2009, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): TPS62270 TPS62272 TPS62273
17
PACKAGE OPTION ADDENDUM
www.ti.com
10-Dec-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
TPS62270DRVR
ACTIVE
WSON
DRV
6
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
CCX
TPS62270DRVT
ACTIVE
WSON
DRV
6
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
CCX
TPS62272DRVR
ACTIVE
WSON
DRV
6
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
OAM
TPS62272DRVT
ACTIVE
WSON
DRV
6
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
OAM
TPS62273DRVR
ACTIVE
WSON
DRV
6
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
CGW
TPS62273DRVT
ACTIVE
WSON
DRV
6
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 85
CGW
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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