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GND
FB
V
SW
V
IN
SHDN
L
22 PH
LM3500-16
V
OUT
AGND
A1
NC
C3
B1
C1
C2
B3
A2
A3
<0.3V
>1.1V
V
IN
2.7V - 5.5V
R2
24:
C
OUT
1PF
Ceramic
C
IN
1PF
Ceramic
LM3500
www.ti.com
SNVS231G –AUGUST 2003–REVISED MAY 2013
LM3500 Synchronous Step-up DC/DC Converter for White LED Applications
Check for Samples: LM3500
1
FEATURES
APPLICATIONS
2
• Synchronous Rectification, High Efficiency
• LCD Bias Supplies
and no External Schottky Diode Required
• White LED Backlighting
• Uses Small Surface Mount Components
• Handheld Devices
• Can Drive 2-5 White LEDs in Series
• Digital Cameras
– (May Function With More Low-V
F
LEDs)
• Portable Applications
• 2.7V to 7V Input Range
DESCRIPTION
• Internal Output Over-Voltage Protection (OVP)
The LM3500 is a fixed-frequency step-up DC/DC
Circuitry, with no External Zener Diode
converter that is ideal for driving white LEDs for
Required
display backlighting and other lighting functions. With
– LM3500-16: 15.5V OVP; LM3500-21: 20.5V
fully intergrated synchronous switching (no external
OVP.
schottky diode required) and a low feedback voltage
• True Shutdown Isolation
(500mV), power efficiency of the LM3500 circuit has
been optimized for lighting applications in wireless
• Input Undervoltage Lockout
phones and other portable products (single cell Li-Ion
• Requires Only Small Ceramic Capacitors at the
or 3-cell NiMH battery supplies). The LM3500
Input and Output
operates with a fixed 1MHz switching frequency.
• Thermal Shutdown
When used with ceramic input and output capacitors,
the LM3500 provides a small, low-noise, low-cost
• 0.1µA Shutdown Current
solution.
• Small 8-Bump Thin DSBGA Package
Typical Application Circuit
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.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2003–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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