TPS62050 Datasheet, PDF (1/21 Pages) Texas Instruments – 800-mA SYNCHRONOUS STEP-DOWN CONVERTER

www.ti.com
TPS62050, TPS62051
TPS62052, TPS62054, TPS62056
SLVS432D – SEPTEMBER 2002 – REVISED OCTOBER 2003
800-mA SYNCHRONOUS STEP-DOWN CONVERTER
FEATURES
• High-Efficiency Synchronous Step-Down
Converter With up to 95% Efficiency
• 12-µA Quiescent Current (Typ)
• 2.7-V to 10-V Operating Input Voltage Range
• Adjustable Output Voltage Range From 0.7 V
to 6 V
• Fixed Output Voltage Options Available in
1.5 V, 1.8 V, and 3.3 V
• Synchronizable to External Clock Signal up to
1.2 MHz
• High Efficiency Over a Wide Load Current
Range in Power-Save Mode
• 100% Maximum Duty Cycle for Lowest
Dropout
• Low Noise Operation in Forced Fixed
Frequency PWM Operation Mode
• Internal Softstart
• Overtemperature and Overcurrent Protected
• Available in 10-Pin Microsmall Outline
Package MSOP
DESCRIPTION
The TPS6205x devices are a family of high-efficiency
synchronous step-down dc/dc converters ideally suited
for systems powered from a 1-cell or 2-cell Li-Ion
battery or from a 3-cell to 5-cell NiCd, NiMH, or alkaline
battery.
The TPS62050 is a synchronous PWM converter with
integrated N-channel and P-channel power MOSFET
switches. Synchronous rectification increases ef-
ficiency and reduces external component count. To
achieve highest efficiency over a wide load current
range, the converter enters a power-saving
pulse-frequency modulation (PFM) mode at light load
currents. Operating frequency is typically 850 kHz,
allowing the use of small inductor and capacitor values.
The device can be synchronized to an external clock
signal in the range of 600 kHz to 1.2 MHz. For low noise
operation, the converter can be programmed into
forced-fixed frequency in PWM mode. In shutdown
mode, the current consumption is reduced to less than
2 µA. The TPS6205x is available in the 10-pin (DGS)
micro-small outline package (MSOP) and operates
over an free air temperature range of -40°C to 85°C.
APPLICATIONS
• Cellular Phones
• Organizers, PDAs, and Handheld PCs
• Low Power DSP Supply
• Digital Cameras and Hard Disks
TYPICAL APPLICATION CIRCUIT
V_I = 3.3 V to 10 V
C_i = 10 µF
1 _VIN
SW ^{9 L1 = 10 µH VO = 1.5 V / 800 mA}
8 _EN
5
FB
TPS62052
6
LBI
4
PG
7
SYNC
GND
3
2
LBO
PGND
10
C_o = 22 µF
TPS62050
EFFICIENCY
vs
OUTPUT CURRENT
100
90
80
70
60
50
40
30
20 ^{VI = 7.2 V,}
V_O = 5 V,
10 _{SYNC = L}
0
0.01 0.1
1
10 100
1k
I_O – Output Current – mA
MATHCAD is a trademark of Mathsoft Incorporated.
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.
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 in-
clude testing of all parameters.
Copyright © 2002 – 2003, Texas Instruments Incorporated