TPS62420_15 Datasheet, PDF (1/38 Pages) Texas Instruments – TPS6242x 2.25-MHz 600-mA and 1000-mA Dual Step-Down Converter in Small 3-mm × 3-mm VSON Package

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TPS62420, TPS62421
SLVS676D – JUNE 2006 – REVISED JULY 2015
TPS6242x 2.25-MHz 600-mA and 1000-mA Dual Step-Down
Converter in Small 3-mm × 3-mm VSON Package
1 Features
•1 High Efficiency up to 95%
• V_IN Range from 2.5 V to 6 V
• 2.25-MHz Fixed Frequency Operation
• Output Current 600 mA and 1000 mA
• Adjustable Output Voltage from 0.6 V to V_IN
• Pin Selectable Output Voltage Supports Simple
Dynamic Voltage Scaling
• Optional EasyScale™ One-Pin Serial Interface for
Dynamic Output Voltage Adjustment
• Power-Save Mode at Light Load Currents
• 180° Out of Phase Operation
• Output Voltage Accuracy in PWM Mode ±1%
• Typical 32-μA Quiescent Current for both
Converters
• 100% Duty Cycle for Lowest Dropout
• Available in a 10-Pin VSON (3 mm × 3 mm)
2 Applications
• Cell Phones, Smart-phones
• PDAs, Pocket PCs
• OMAP™ and Low Power DSP Supply
• Portable Media Players
• Digital Radios
• Digital Cameras
3 Description
The TPS6242x device is a synchronous dual step-
down DC–DC converter. It provides two independent
output voltage rails powered by 1-cell Li-Ion or 3-cell
NiMH/NiCD batteries. The device is also suitable to
operate from a standard 3.3-V or 5-V voltage rail.
With an input voltage range of 2.5 V to 6 V, the
TPS6242x is ideal for battery-powered portable
applications like smart phones, PDAs, and other
portable equipment.
With the EasyScale™ serial interface the output
voltages can be modified during operation. It
therefore supports dynamic voltage scaling for low
power DSP and processors.
The TPS6242x operates at 2.25-MHz fixed switching
frequency and enter the power-save mode operation
at light load currents to maintain high efficiency over
the entire load current range. For low-noise
applications the devices can be forced into fixed-
frequency PWM mode by pulling the MODE/DATA
pin High. In the shutdown mode, the current
consumption is reduced to 1.2 μA. The device allows
the use of small inductors and capacitors to achieve a
small solution size.
The TPS6242x operates over a free-air temperature
range of –40°C to 85°C. It is available in a 10-pin
leadless package (3 mm × 3 mm VSON)
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
TPS62420
TPS62421
VSON (10)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application Schematic
VIN 2.5V – 6V
C_IN
10 μF
TPS62420
VIN
EN_1
FB 1
SW1
DEF_1
L1
2.2 μH
R11
270kΩ
R12
180kΩ
V_OUT1 = 1.5V
up to 600mA
C_OUT1 = 22 µF
EN_2
MODE/
DATA
SW2
ADJ2
GND
L2
2.2 μH _R21
C_ff2
360kΩ 33pF
R22
180kΩ
V_OUT2 = 1.8V
Up to 1000mA
C_OUT2 = 22 µF
Efficiency vs Output Current
100
90
80
70
V _OUT2 = 1.8V
60
V _IN = 3.6V
MODE/DATA = 0
50
V _OUT1 = 1.5V
40
30
20
10
0
0.01
0.1
1
10
IOUT mA
100
1000
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.