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LM2795 Datasheet Preview

LM2795 Datasheet

Current Regulated Switched Capacitor LED Supply

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LM2794, LM2795
www.ti.com
SNVS168L – JANUARY 2002 – REVISED MAY 2013
LM2794 /LM2795 Current Regulated Switched Capacitor LED Supply with Analog and
PWM Brightness Control
Check for Samples: LM2794, LM2795
FEATURES
1
2 Regulated Current Sources with ±0.5%
Matching between any Two Outputs
• High Efficiency 3/2 Boost Function
• Drives One, Two, Three or four White LEDs
• 2.7V to 5.5V Input Voltage
• Up to 80mA Output Current
• Analog Brightness Control
• Active-Low or High Shutdown Input ('94/95)
• Very Small Solution Size and no Inductor
• 2.3µA (typ.) Shutdown Current
• 325kHz Switching Frequency (min.)
• Constant Frequency Generates Predictable
Noise Spectrum
• Thin DSBGA Package: 2.08mm X 2.403mm X
0.600mm High
APPLICATIONS
• White LED Display Backlights
• White LED Keypad Backlights
• 1-Cell Li-Ion Battery-Operated Equipment
Including PDAs, Hand-Held PCs, Cellular
Phones
DESCRIPTION
The LM2794/95 is a fractional CMOS charge-pump
that provides four regulated current sources. It
accepts an input voltage range from 2.7V to 5.5V and
maintains a constant current determined by an
external sense resistor.
The LM2794/5 delivers up to 80mA of load current to
accommodate four White LEDs. The switching
frequency is 325kHz. (min.) to keep the conducted
noise spectrum away from sensitive frequencies
within portable RF devices.
Basic Application Circuit
CIN 1PF
C1
C2
VIN POUT
C1+
1PF
C1-
C2+
1PF LM2794/95
C2-
SD
D1
D2
D3
D4
BRGT
GND
ISET
CHOLD
1PF
LED1
LED2
LED3
LED4
RSET
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.
All trademarks are the property of their respective owners.
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 © 2002–2013, Texas Instruments Incorporated




etcTI

LM2795 Datasheet Preview

LM2795 Datasheet

Current Regulated Switched Capacitor LED Supply

No Preview Available !

LM2794, LM2795
SNVS168L – JANUARY 2002 – REVISED MAY 2013
www.ti.com
DESCRIPTION (CONTINUED)
Brightness can be controlled by both linear and PWM techniques. A voltage between 0V and 3.0V may be
applied to the BRGT pin to linearly vary the LED current. Alternatively, a PWM signal can be applied to the SD
pin to vary the perceived brightness of the LED. The SD pin reduces the operating current to 2.3µA (typ.) The
LM2794 is shut down when the SD pin is low, and the LM2795 is shut down when the SD pin is high.
The LM2794/95 is available in a DSBGA CSP package.
Connection Diagram
E7
D6
E5
C7
A7
B6
A5
E3 A3
D2 B2
E1 C1 A1
Figure 1. DSBGA Package
Bottom View
Pin (1)
A1
B2
C1
D2
E1
E3,E5,E7,D6
C7
B6
A7
A5
A3
Name
C1+
C1
VIN
GND
C2
D14
ISET
BRGT
SD
C2+
POUT
PIN DESCRIPTION
Function
Positive terminal of C1
Negative terminal of C1
Power supply voltage input
Power supply ground input
Negative terminal of C2
Current source outputs. Connect directly to LED
Current Sense Input. Connect 1% resistor to ground to set constant current through LED
Variable voltage input controls output current
The LM2794 has an active-low shutdown pin (LOW = shutdown, HIGH = operating). The LM2795
has an active-high shutdown pin (HIGH = shutdown, LOW = operating) that has a pull-up to VIN.
Positive terminal of C2
Charge pump output
(1) Note that the pin numbering scheme for the DSBGA package was revised in April, 2002 to conform to JEDEC standard. Only the pin
numbers were revised. No changes to the physical location of the inputs/outputs were made. For reference purpose, the obsolete
numbering had C1+ as pin 1, C1- as pin 2, VIN as pin 3, GND as pin 4, C2- as pin 5, D1-D4 as pin 6,7,8 & 9, Iset as pin 10, BRGT as
pin 11, SD as pin 12, C2+ as pin 13, Pout as pin 14
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2 Submit Documentation Feedback
Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM2794 LM2795


Part Number LM2795
Description Current Regulated Switched Capacitor LED Supply
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