TPS62510_15 Datasheet, PDF (1/25 Pages) Texas Instruments – 1.5-A, LOW VI HIGH EFFICIENCY STEP-DOWN CONVERTER

TPS62510
www.ti.com ................................................................................................................................................................ SLVS651A – MAY 2006 – REVISED JULY 2009
1.5-A, LOW V_I HIGH EFFICIENCY STEP-DOWN CONVERTER
FEATURES
1
•2 1.8-V to 3.8-V Input Voltage Range
• Up to 96% High Efficiency Synchronous
Step-Down Converter
• 1.5-MHz Fixed Frequency PWM Operation
• 1% Output Voltage Accuracy in Fixed
Frequency PWM Mode
• Power Save Mode Operation for High
Efficiency Over the Entire Load Current Range
• 22-µA Quiescent Current
• Fixed and Adjustable Output Voltage
• Output Voltage Tracking (OVT) for Reliable
Sequencing
• Available in a 10-Pin QFN (3 x 3 mm) Package
APPLICATIONS
• Portable Devices (Mobile Phone, PDA)
• 2-Cell NiMHd/Alkaline Applications
• Hard Disc Drives
• Point-Of-Load Regulation
• Notebook Computers
• WiMAX and WLAN Applications
DESCRIPTION
The TPS62510 family are high-efficiency step-down
converters targeted for operation from a 1.8-V to
3.8-V input voltage rail, ideally suited for 2-cell
Alkaline or NiMHd applications. The TPS62510 is
also ideal as a point-of-load regulator running from a
fixed 3.3-V, 2.5-V or 1.8-V input voltage rail. The
converter operates in fixed frequency PWM mode
switching at 1.5 MHz with the MODE pin high. Pulling
the MODE pin low enables the high efficiency mode.
In high efficiency mode, the device operates with a
1.5 MHz fixed frequency PWM at nominal load
current, and automatically enters the Power Save
Mode at light load currents. For maximum system
reliability, the converter features Output Voltage
Tracking using the OVT pin to allow sequencing, and
to allow for the output voltage to track an external
voltage applied to this pin.
VI
1.8 V to 3.8 V
C1
22 mF
Rf 1 W
Cf
100 nF
TPS62510
L1
10 _PVIN
SW ^{1 2.2 mH}
C3
9
AVIN
FB ⁴
22 pF
6 _EN
PG ⁸
5 _OVT
AGND ³
7 _{MODE PGND} 2
VO
1.5 V to 1.5 A
R1
300 kW
R2
200 kW
C2
22 mF
Figure 1. Typical Application
95
VI = 1.9 V
90
(Mode Low)
85 ^VI ^{= 2.4 V}
(Mode Low)
80
75
VI = 1.9 V
(Mode High)
70
VI = 3.2 V
VI = 2.4 V
65
(Mode Low)
(Mode High)
60
55
V_O = 1.2 V
50
0.01 0.1
1
VI = 3.2 V
(Mode High)
10 100 1 k 10 k
I_L - Load Current- mA
Figure 2. Efficiency vs Load Current
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.
PowerPAD is a trademark 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.
Copyright © 2006–2009, Texas Instruments Incorporated