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TPS62111 Datasheet

  • TPS62111

  • 采用 QFN-16 封裝的 3.3V 1.5A 輸出 17V 輸入的步降轉(zhuǎn)換器

  • 1804.00KB

  • 24頁(yè)

  • TI

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TPS62110
TPS62111
TPS62112
www.ti.com
SLVS585 鈥?JULY 2005
17-V, 1.5-A, SYNCHRONOUS STEP-DOWN CONVERTER
FEATURES
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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-碌A(chǔ) Quiescent Current (Typical)
Overtemperature and Overcurrent Protected
Available in 16-Pin QFN Package
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 鈥?and P-channel power MOSFET switches.
Synchronous rectification is used to increase ef-
ficiency 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 exter-
nal 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 碌A(chǔ).
The TPS6211x is available in the 16-pin (RSA) QFN
package, and operates over a free-air temperature
range of 鈥?0擄C to 85擄C.
TPS62111
Efficiency vs Output Current
100
4.2 V
90
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
VIN
VIN
EN
VINA
C
I
= 10
m
F
25 V
1
m
F
LBO
AGND
LBI
SYNC
GND GND PwPD PGND PGND
FB
6.8
m
H
TPS62111
1M
PG
C
O
= 22
m
F
6.3 V
80
Efficiency - %
SW
SW
V
O
= 3.3 V
70
60
50
12 V
40
30
20
10
0
0.0001
0.001
5V
8.4 V
V
O
= 3.3 V
o
T
A
= 25 C
PFM Mode
0.01
0.1
1
10
I
O
- Output Current- A
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.
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 漏 2005, Texas Instruments Incorporated

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TPS62112

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