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LM27953 の電気的特性と機能

LM27953のメーカーはNational Semiconductorです、この部品の機能は「White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost」です。


製品の詳細 ( Datasheet PDF )

部品番号 LM27953
部品説明 White LED Driver with Four LED Current Sinks and 3/2x Switched Capacitor Boost
メーカ National Semiconductor
ロゴ National Semiconductor ロゴ 




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LM27953 Datasheet, LM27953 PDF,ピン配置, 機能
November 2004
www.DataSheet4U.com
LM27953
White LED Driver with Four LED Current Sinks and 3/2x
Switched Capacitor Boost
General Description
The LM27953 is a charge-pump-based white-LED driver that
is ideal for mobile phone display backlighting. It is intended
to drive 4 LEDs for a main phone display backlight. Regu-
lated internal current sources deliver excellent current and
brightness matching in all LEDs.
The LED driver current sinks can be used to backlight a main
phone display with up to 4 LEDs. The low-side current
drivers accommodate common-anode-type LEDs. The cur-
rent sinks can also drive standard two-terminal LEDs, and
provide other general lighting functions (keypad lighting, fun
lighting, etc). The brightness of the LEDs can be adjusted
independently with an external resistor.
The LM27953 works off an extended Li-Ion input voltage
range (2.7V to 5.5V). Voltage boost is achieved with a high-
efficiency 3/2x-gain charge pump.
The LM27953 is available in National’s chip-scale 18-bump
micro SMD package.
Features
n Drives 4 Individual Common-Anode LEDs with up to
20mA each for a Main Display Backlight
n Independent Resistor-Programmable Current Setting
n Excellent Current and Brightness Matching
n High-Efficiency 3/2x Charge Pump
n Extended Li-Ion Input: 2.7V to 5.5V
n PWM Brightness Control: 100Hz - 1kHz
n 18-bump Thin Micro SMD Package:
(2.1mm x 2.4mm x 0.6mm)
Applications
n Mobile Phone Display Lighting
n Mobile Phone Keypad Lighting
n PDAs
n General LED Lighting
Typical Application Circuit
© 2004 National Semiconductor Corporation DS201280
20128001
www.national.com

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LM27953 pdf, ピン配列
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN pin voltage
EN pin voltages
IDx Pin Voltages
Continuous Power Dissipation
(Note 3)
Junction Temperature (TJ-MAX)
Storage Temperature Range
Maximum Lead Temperature
(Soldering, 10 sec.)
ESD Rating (Note 4)
Human Body Model - IDx Pins:
Human Body Model - All other Pins:
Machine Model - IDx Pins:
Machine Model - All Other Pins:
-0.3V to 7.1V
-0.3V to (VIN+0.3V)
w/ 6.0V max
-0.3V to
(VPOUT+0.3V)
w/ 6.0V max
Internally Limited
150oC
-65oC to +150o C
265oC
1.0kV
2.0kV
100V
200V
Operating Rating (Notes 1, 2)
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Input Voltage Range
2.7V to 5.5V
Junction Temperature (TJ) Range
Ambient Temperature (TA) Range
(Note 5)
-30˚C to +125˚C
-30˚C to +85˚C
Thermal Properties
Juntion-to-Ambient Thermal
Resistance (θJA), (Note 6)
100˚C/W
Electrical Characteristics (Notes 2, 7)
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: VIN = 3.6V; VDx = 0.6V; EN = 1.5V; RSET = 8.35k; CIN, C1, C2 , and CPOUT = 1µF. (Note 8)
Symbol
Parameter
Condition
Min Typ Max Units
IDx Output Current Regulation
IDx-MATCH Current Matching Between
Outputs
3.0V VIN 4.2V, and VIN = 5.5V
0.45V VDx 3.8V
RSET = 8.35k
3.0V VIN 5.5V;
0.6V VDx 3.8V
RSET = 6.25k
3.0V VIN 5.5V;
0.3V VDx 3.8V
RSET = 12.5k
2.7V VIN 3.0V;
0.45V VDx 3.8V
RSET = 8.35k
VIN = 3.0V (Note 9)
13.5
16.5 mA
15
(-10%)
(+10%) (%)
20 mA
10 mA
15 mA
0.6 %
IQ
Quiescent Supply Current
2.7V VIN 4.2V;
No Load Current,
4.4 6.75 mA
EN = ON
ISD Shutdown Supply Current
2.7V VIN 5.5V,
ENA OFF
2.3 5 µA
VSET
IDx/ISET
ISET Pin Voltage
Output Current to Current Set
Ratio
2.7V VIN 5.5V
1.25
100
V
ROUT
Charge Pump Output Resistance VIN = 3.0V
(Note 10)
2.7
VHR Current Source Headroom
IDx = 95% X IDx (nom)
Voltage Requirement (Note 11) RSET = 8.35k
(IDx (nom) 15mA)
fSW Switching Frequency
3.0V VIN 4.2V
320 mV
375 500 625 kHz
3 www.national.com


3Pages


LM27953 電子部品, 半導体
Typical Performance Characteristics Unless otherwise specified: VIN = 3.6V; VLED = 3.6V; EN = VIN;
RSET = 8.35k; CIN, C1, C2 , and CPOUT = 1µF. (Continued)
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Charge Pump Output Voltage
vs. Output Current
Charge Pump Output Voltage
vs. Input Voltage (No Load Current)
20128010
Input Current vs. Input Voltage
20128008
Charge Pump Output Resistance
vs Output Current
20128009
20128011
www.national.com
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