TPS40222 Datasheet, PDF (1/26 Pages) Texas Instruments – 1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm 3 mm SON PACKAGE

www.ti.com
TPS40222
SLUS642A – OCTOBER 2005 – REVISED JANUARY 2006
1.6-A, 1.25-MHz BUCK CONVERTER IN A 3 mm × 3 mm SON PACKAGE
FEATURES
• Input Voltage Range 4.5 V_DC to 8 V_DC
• Output Voltage (0.8 V to 90% V_IN)
• 0 A to 1.6 A Current Capability
• Fixed 1.25-MHz Switching Frequency
• Reference 0.8 V ±1%
• Internal 250 mΩ N-Channel MOSFET Switch
• Current Mode Control with Internal Slope
Compensation
• Internal Soft-Start
• Internal Loop Compensation
• Short Circuit Protection
• Thermal Shutdown
• High Efficiency Up to 92%
• Small 3 mm × 3 mm SON Package
100
V_IN = 5 V
95
TYPICAL EFFICIENCY
vs
LOAD CURRENT
90
85
V_OUT = 3.3 V
80
75
70
V_OUT = 1.25 V
65
APPLICATIONS
• Disk Drives
• Set Top Box
• Point of Load Power
• ASIC Power Supplies
DESCRIPTION
The TPS40222 is a fixed-frequency, current-mode,
non-synchronous buck converter optimized for
applications powered by a 5-V distributed source.
With internally determined operating frequency,
soft-start time, and control loop compensation, the
TPS40222 provides many features with a minimum of
external components.
The TPS40222 operates at 1.25 MHz and supports
up to 1.6-A output loads. The output voltage can be
programmed to as low as 0.8 V. The TPS40222
utilizes pulse-by-pulse current limit as well as
frequency foldback to protect the converter during a
catastrophic short circuited output condition.
SIMPLIFIED APPLICATION DIAGRAM
V_IN
C1
6
5
4
BOOST AVIN PVIN
TPS40222
FB GND SW
1
2
3
C2
L1
V_OUT
D1
C3 ^R1
R2
60
0
0.2 0.4 0.6 0.8 1.0 1.2
I_LOAD − Load Current − A
1.4 1.6
UDG−04135
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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2005–2006, Texas Instruments Incorporated