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參數資料
| 型號： | TPS60251RTW |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I2C INTERFACE |
| 中文描述： | 高效電荷泵7，帶有I2C接口個WLED |
| 文件頁數： | 1/28頁 |
| 文件大小： | 515K |
| 代理商： | TPS60251RTW |
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www.ti.com
FEATURES
3.0-V to 6.0-V Input Voltage Range
×
1 and
×
1.5 Charge Pump
Fully Programmable Current with I
2
C
–
64 Dimming Steps with 25mA Maximum
(Sub and Main Display Banks)
–
4 Dimming Steps with 80mA Maximum
(DM5 for Auxiliary Application)
2% Current Matching for Sub LEDs at Light
Load Condition (Each 100
μ
A)
750-kHz Charge Pump Frequency
Continuous 230-mA Maximum Output Current
Auto Switching Between
×
1 and
×
1.5 Mode for
Maximum Efficiency
Built-in Soft Start and Current Limit
Hardware Enable/Disable
Open Lamp Detection
24-Pin 4mm x 4mm QFN
APPLICATIONS
Cellular Phones
PDA, PMP, GPS (Up To 4 Inch Display)
Multidisplay Handheld Devices
DESCRIPTION
The
TPS60251
frequency charge pump DC/DC converter that uses a
dual mode 1
×
and 1.5
×
conversion to maximize
efficiency over the input voltage range. It drives up to
five white LEDs for a main display and up to two
white LEDs for a sub display with regulated constant
current for uniform intensity. By utilizing adaptive
1
×
/1.5
×
charge pump modes and very low-dropout
current regulators, the TPS60251 achieves high
efficiency over the full 1-cell lithium-battery input
voltage range.
95
90
85
80
75
70
65
60
55
50
E
3
3.5
4
4.5
5
5.5
6
V - Input Voltage - V
4 Main LED - 15 mA, V = 3.1 V
C1+
SDAT
DS1 DS2 DM5
VIO
NC
GND
GND
NC-G
NC
DM1
DM2
DM3
DM4
IS
ENA
GND
C2+
C2-
C1-
VOUT
VIN
Main Display
C1
1uF
C4
4.7uF
C2
1uF
C3
1uF
Sub Display
SCLK
I
2
C Interface
1.8V for I /O
Input
Auxiliary Port for Key Pad
or Flash Light
TPS60251
SLVS767–APRIL 2007
HIGH EFFICIENCY CHARGE PUMP FOR 7 WLEDs WITH I
2
C INTERFACE
is
a
high
efficiency,
constant
Four enable inputs, ENmain, ENsub1, ENsub2, and
ENaux, available through I
2
C, are used for simple
on/off controls for the main, sub1, sub2, and DM5
displays, respectively. To lower operating current
when using one sub display LED, the device
provides independent operation in sub display LEDs.
The TPS60251 is available in a 24-pin 4mmx4mm
thin QFN.
Figure 1. Typical Application for Sub and Main
Figure 2. Efficiency vs Input Voltage
ORDERING INFORMATION
(1)
PART NUMBER
TPS60251RTW
PACKAGE
T
A
24 Pin 4 mm
×
4 mm QFN (RTW)
–40
°
C to +85
°
C
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
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 2007, Texas Instruments Incorporated
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS60251RTWR | 功能描述:LED照明驅動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWRG4 | 功能描述:LED照明驅動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWT | 功能描述:LED照明驅動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
| TPS60251RTWT | 制造商:Texas Instruments 功能描述:DC/DC Charge Pump Converter IC |
| TPS60251RTWTG4 | 功能描述:LED照明驅動器 High Eff Charge Pump RoHS:否 制造商:STMicroelectronics 輸入電壓:11.5 V to 23 V 工作頻率: 最大電源電流:1.7 mA 輸出電流: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:SO-16N |
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