SLVS432E – SEPTEMBER 2002 – REVISED JUNE 2011
800-mA SYNCHRONOUS STEP-DOWN CONVERTER
Check for Samples:
1
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
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.
2
•
•
•
•
•
•
•
•
•
•
•
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
1
VIN
SW
9
L1 = 10
µH
V
O
= 1.5 V / 800 mA
100
90
80
70
Efficiency – %
TPS62050
EFFICIENCY
vs
OUTPUT CURRENT
8
C
i
= 10
µF
EN
TPS62052
FB
5
6
7
LBI
SYNC
GND
3
10
PG
4
C
o
= 22
µF
2
60
50
40
30
20
10
0
0.01
V
I
= 7.2 V,
V
O
= 5 V,
SYNC = L
0.1
1
10
100
1k
LBO
PGND
I
O
– Output Current – mA
1
2
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.
MATHCAD is a registered trademark of Mathsoft Incorporated.
Copyright © 2002–2011, Texas Instruments Incorporated
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.
TI [ TEXAS INSTRUMENTS ]
