TPS62020_15 Datasheet, PDF (1/28 Pages) Texas Instruments – 600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER

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TPS62020
TPS62021
TPS62026
SLVS076C – JUNE 2003 – REVISED DECEMBER 2004
600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER
FEATURES
• Up to 95% Conversion Efficiency
• Typical Quiescent Current: 18 µA
• Load Current: 600 mA
• Operating Input Voltage Range: 2.5 V to 6.0 V
• Switching Frequency: 1.25 MHz
• Adjustable and Fixed Output Voltage
• Power Save Mode Operation at Light load
Currents
• Active-Low MODE pin on TPS62021
• 100% Duty Cycle for Lowest Dropout
• Internal Softstart
• Dynamic Output Voltage Positioning
• Thermal Shutdown
• Short-Circuit Protection
• 10 Pin MSOP PowerPad™ Package
• 10 Pin QFN 3 X 3 mm Package
DESCRIPTION
The TPS6202x is a high efficiency synchronous
step-down dc-dc converter optimized for battery pow-
ered portable applications. This device is ideal for
portable applications powered by a single Li-Ion
battery cell or by 3-cell NiMH/NiCd batteries. With an
output voltage range from 6.0 V down to 0.7 V, the
device supports low voltage DSPs and processors in
PDAs, pocket PCs, as well as notebooks and
subnotebook computers. The TPS6202x operates at
a fixed switching frequency of 1.25 MHz and enters
the power save mode operation at light load currents
to maintain high efficiency over the entire load current
range. For low noise applications, the device can be
forced into fixed frequency PWM mode by pulling the
MODE pin high. The difference between the
TPS6202x and the TPS62021 is the logic level of the
MODE pin. The TPS62021 has an active-low MODE
pin. The TPS6202x supports up to 600-mA load
current.
APPLICATIONS
• PDA, Pocket PC and Smart Phones
• USB Powered Modems
• CPUs and DSPs
• PC Cards and Notebooks
• xDSL Applications
• Standard 5-V to 3.3-V Conversion
Typical Application Circuit (600-mA Output Current)
V_I
2.5 V to 6 V
C3
10 µF
TPS62020
2 _VIN
3 _VIN
1 _EN
6
MODE
4 _GND
8
SW
7
SW
FB ⁵
PGND ¹⁰
PGND ⁹
L1
10 µH
R1
V_O
0.7 V to V_I / 600 mA
C4
10 µF
C1
R2
C2
EFFICIENCY
vs
LOAD CURRENT
100
95 ^{VO = 1.8 V}
90
V_I = 2.7 V
85
80 ^{VI = 3.6 V}
75 ^{VI = 5 V}
70
65
Mode = Low
60
55
50
V_I = 3.6 V
Mode = High
45
40
0
0.01 0.10 1
10 100 1000
I_L − Load Current − mA
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPad is a trademark of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2003–2004, Texas Instruments Incorporated