TPS62650_11 Datasheet, PDF (1/38 Pages) Texas Instruments – 800-mA, 6-MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER WITH I2CTM COMPATIBLE

TPS62650
CSP-9
TPS62651
www.ti.com
SLVS808A – AUGUST 2009 – REVISED FEBRUARY 2011
800-mA, 6-MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER
WITH I²C^TM COMPATIBLE INTERFACE IN CHIP SCALE PACKAGING
Check for Samples: TPS62650, TPS62651
FEATURES
1
•2 86% Efficiency at 6 MHz Operation
• 38μA Quiescent Current
• Wide V_IN Range From 2.3 V to 5.5 V
• 6MHz Regulated Frequency Operation
• Best-In-Class Load and Line Transient
• ±2% PWM DC Voltage Accuracy
• Automatic PFM/PWM Mode Switching
• Low Ripple Light-Load PFM
• I²C Compatible Interface up to 3.4 Mbps
• Pin-Selectable Output Voltage (VSEL)
• Internal Soft-Start, <150-μs Start-Up Time
• Current Overload and Thermal Shutdown
Protection
• Three Surface-Mount External Components
Required (One MLCC Inductor, Two Ceramic
Capacitors)
• Complete Sub 1-mm Component Profile
Solution
• Total Solution Size <13mm²
• Available in a 9-Pin NanoFree™ (CSP)
Packaging
APPLICATIONS
• SmartReflex™ Compliant Power Supply
• OMAP™ Application Processor Core Supply
• Cell Phones, Smart-Phones
• Micro DC-DC Converter Modules
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TPS62650
V_I
2.3 V .. 5.5 V
C1
4.7mF
VIN
GND
FB
SW
L1
0.47 mH
V_O
C2
4.7mF
V_O = Roof
V_O = Floor
I²C Bus
up to 3.4 Mbips
EN
VSEL
SDA
SCL
Figure 1. Typical Application
DESCRIPTION
The TPS6265x device is a high-frequency
synchronous step-down dc-dc converter optimized for
battery-powered portable applications. Intended for
low-power applications, the TPS6265x supports up to
800mA 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 0.75V, the device supports
low-voltage DSPs and processors core power
supplies in smart-phones and handheld computers.
The TPS6265x operates at a regulated 6MHz
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 3.5μA.
The serial interface is compatible with Standard,
Fast/Fast Plus 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 12.5mV,
for setting the output voltage or reprogramming the
mode of operation (PFM/PWM or Forced PWM) for
instance.
The TPS6265x is available in an 9-pin chip-scale
package (CSP).
100
90 ^{VO = 1.2V}
80
70
V_I = 2.7V
PFM/PWM Operation
60
50
V_I = 3.6V
PFM/PWM Operation
40
30
V_I = 4.2V
20
PFM/PWM Operation
10
0
0.1
1
10
V_I = 3.6V
Forced PWM Operation
100
1000
I_O − Load Current − mA
Figure 2. Efficiency vs Load Control
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 are trademarks of Texas Instruments.
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.
© 2009–2011, Texas Instruments Incorporated