TPS62355DRCR Datasheet, PDF (1/46 Pages) Texas Instruments – 800-mA / 1000-mA, 3-MHz SYNCHRONOUS STEP-DOWN CONVERTER

QFN-10 CSP-12
TPS62350, TPS62351
TPS62352, TPS62353
TPS62354, TPS62355, TPS62356
www.ti.com .............................................................................................................................................................. SLVS540E – MAY 2006 – REVISED APRIL 2008
800-mA / 1000-mA, 3-MHz SYNCHRONOUS STEP-DOWN CONVERTER
WITH I²C™ COMPATIBLE INTERFACE IN CHIP SCALE PACKAGING
FEATURES
1
•234 88% Efficiency at 3-MHz Operation
• 800-mA Output Current at V_I = 2.7 V
• 3-MHz Fixed Frequency Operation
• Best in Class Load and Line Transient
• Complete 1-mm Component Profile Solution
• ±2% PWM DC Voltage Accuracy
• 35-ns Minimum On-Time
• Efficiency Optimized Power-Save Mode
(Light PFM)
• Transient Optimized Power-Save Mode
(Fast PFM)
• 28-µA Typical Quiescent Current
• I²C Compatible Interface up to 3.4 Mbps
• Pin-Selectable Output Voltage
• Synchronizable On the Fly to External
Clock Signal
• Available in a 10-Pin QFN (3 x 3 mm) and
12-Pin NanoFree™ (CSP) Packaging
APPLICATIONS
• SmartReflex™ Compliant Power Supply
• Split Supply DSPs and µP Solutions
OMAP™, XSCALE™
• Cell Phones, Smart-Phones
• PDAs, Pocket PCs
• Digital Cameras
• Micro DC-DC Converter Modules
TYPICAL APPLICATION
TPS62350YZG
V_I
2.7 V .. 5.5 V
C1
A
PVIN
AVIN
PGND
PGND
FB
SW
AGND
V_O = Roof
V_O = Floor
I²C Bus
up to 3.4 Mbips
EN
VSEL
SDA
SCL
SYNC
L1
1 mH
A
DESCRIPTION
The TPS6235x device is a high-frequency
synchronous step-down dc-dc converter optimized for
battery-powered portable applications. Intended for
low-power applications, the TPS6235x supports up to
800-mA load current and allows the use of small, low
cost inductors and capacitors.
The device is ideal for mobile phones and similar
portable applications powered by a single-cell Li-Ion
battery. With an output voltage range adjustable via
I²C interface down to 0.6 V, the device supports
low-voltage DSPs and processors core power
supplies in smart-phones, PDAs, and handheld
computers.
The TPS6235x operates at 3-MHz fixed switching
frequency and enters the efficiency optimized
power-save mode operation at light load currents to
maintain high efficiency over the entire load current
range. In the shutdown mode, the current
consumption is reduced to less than 2 µA.
The serial interface is compatible with Fast/Standard
and High-Speed mode I²C specification allowing
transfers at up to 3.4 Mbps. This communication
interface is used for dynamic voltage scaling with
voltage steps down to 12.5 mV, for reprogramming
the mode of operation (Light PFM, Fast PFM or
Forced PWM) or disable/enabling the output voltage.
V_O
C2
10 mF
EFFICIENCY vs LOAD CURRENT
100
90
80
70
60
50
40
30 _{VI = 3.6 V}
20 _{VO = 1.35 V}
10 _{LPFM/PWM Mode}
0
0.1 1
10 100 1000
I_O − Output Current − mA
1
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.
NanoFree, SmartReflex, OMAP, PowerPAD are trademarks of Texas Instruments.
2
XSCALE is a trademark of Intel Corporation.
3
I2C is a trademark of Philips Corporation.
4
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 © 2006–2008, Texas Instruments Incorporated