TPS62050DGSRG4 Datasheet, PDF (1/25 Pages) Texas Instruments – 800-mA SYNCHRONOUS STEP-DOWN CONVERTER

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TPS62052, TPS62054
TPS62056, TPS62050, TPS62051
SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011
800-mA SYNCHRONOUS STEP-DOWN CONVERTER
Check for Samples: TPS62052, TPS62054, TPS62056, TPS62050, TPS62051
FEATURES
1
•2 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
efficiency 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
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
MATHCAD is a registered trademark of Mathsoft Incorporated.
2
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 © 2002–2011, Texas Instruments Incorporated