TPS62040_12 Datasheet, PDF (1/30 Pages) Texas Instruments – 1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER

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TPS62040
TPS62042, TPS62043
TPS62044, TPS62046
SLVS463B − JUNE 2003 − REVISED OCTOBER 2005
1.2 A/1.25 MHz, HIGH-EFFICIENCY STEP-DOWN CONVERTER
FEATURES
D Up to 95% Conversion Efficiency
D Typical Quiescent Current: 18 µA
D Load Current: 1.2 A
D Operating Input Voltage Range: 2.5 V to 6.0 V
D Switching Frequency: 1.25 MHz
D Adjustable and Fixed Output Voltage
D Power Save Mode Operation at Light load
Currents
D 100% Duty Cycle for Lowest Dropout
D Internal Softstart
D Dynamic Output Voltage Positioning
D Thermal Shutdown
D Short-Circuit Protection
D 10 Pin MSOP PowerPad™ Package
D 10 Pin QFN 3 X 3 mm Package
APPLICATIONS
D PDA, Pocket PC and Smart Phones
D USB Powered Modems
D CPUs and DSPs
D PC Cards and Notebooks
D xDSL Applications
D Standard 5-V to 3.3-V Conversion
DESCRIPTION
The TPS6204x family of devices are high efficiency
synchronous step-down dc-dc converters optimized for
battery powered portable applications. The devices are
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 devices
support low voltage DSPs and processors in PDAs,
pocket PCs, as well as notebooks and subnotebook
computers. The TPS6204x 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 devices can be forced into fixed
frequency PWM mode by pulling the MODE pin high. The
TPS6204x supports up to 1.2-A load current.
Typical Application Circuit 1.2-A Output Current
V_I
2.5 V to 6 V
C1
22 µF
TPS6204x
2
VIN
3 _VIN
1
EN
6 _MODE
4 _GND
8
SW
7
SW
FB ⁵
PGND ¹⁰
PGND ⁹
L1
V_O
6.2 µH ^{0.7 V to V}I ^{/1.2 A}
C2
22 µF
EFFICIENCY
vs
LOAD CURRENT
100
V_O = 1.8 V
95
90
V_I = 2.7 V
85
V_I = 3.6 V
80 V_I = 5 V
75
70
65
MODE = Low
60
55
50
V_I = 3.6 V
45
MODE = High
40 _{0 0.01 0.1}
1
10 100 1 k 10 k
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 Texas Instruments standard warranty.
Production processing does not necessarily include testing of all parameters.
Copyright © 2003 − 2005, Texas Instruments Incorporated