TPS62110 Datasheet, PDF (1/28 Pages) Texas Instruments – 17-V, 1.5-A, SYNCHRONOUS STEP-DOWN CONVERTER

TPS62110, TPS62111
TPS62112, TPS62113
www.ti.com .................................................................................................................................................... SLVS585A – JULY 2005 – REVISED FEBRUARY 2009
17-V, 1.5-A, SYNCHRONOUS STEP-DOWN CONVERTER
FEATURES
1
• High-Efficiency Synchronous Step-Down
Converter With up to 95% Efficiency
• 3.1-V to 17-V Operating Input Voltage Range
• Adjustable Output Voltage Range From
1.2 V to 16 V
• Fixed Output Voltage Options Available in
3.3 V and 5 V
• Synchronizable to External Clock Signal up to
1.4 MHz
• Up to 1.5-A Output Current
• High Efficiency Over a Wide Load-Current
Range Due to PFM/PWM Operation Mode
• 100% Maximum Duty Cycle for Lowest
Dropout
• 20-µA Quiescent Current (Typical)
• Overtemperature and Overcurrent Protected
• Available in 16-Pin QFN Package
APPLICATIONS
• Point-of-Load Regulation From 12-V Bus
• Organizers, PDAs, and Handheld PCs
• Handheld Scanners
TYPICAL APPLICATION
V_I = 3.8 V to 17 V
C_I = 10 mF
25 V
1 mF
VIN
VIN
EN
VINA
TPS62111
AGND
LBI
SYNC
SW
SW
PG
LBO
FB
GND GND PwPD PGND PGND
6.8 mH
1 MW
V_O = 3.3 V
C_O = 22 mF
6.3 V
DESCRIPTION
The TPS6211x devices are a family of low-noise
synchronous step-down dc-dc converters that are
ideally suited for systems powered from a 2-cell Li-ion
battery or from a 12-V or 15-V rail.
The TPS6211x is a synchronous PWM converter with
integrated N- and P-channel power MOSFET
switches. Synchronous rectification is used to
increase efficiency and to reduce 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 1 MHz, allowing the use of small inductor
and capacitor values. The device can be
synchronized to an external clock signal in the range
of 0.8 MHz to 1.4 MHz. For low-noise operation, the
converter can be operated in PWM-only mode. In the
shutdown mode, the current consumption is reduced
to less than 2 µA. The TPS6211x is available in the
16-pin (RSA) QFN package, and operates over a
free-air temperature range of –40°C to 85°C.
TPS62111
Efficiency vs Output Current
100
4.2 V
90
80
70
5V
60
8.4 V
50
12 V
40
30
20
10
0
0.0001
V_O = 3.3 V
T_A = 25^oC
PFM Mode
0.001 0.01
0.1
1
10
I_O - Output Current- A
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.
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 © 2005–2009, Texas Instruments Incorporated