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SIP12501 Datasheet, PDF (1/9 Pages) Vishay Siliconix – Boost Converter for Single/Double AA Cell or NiMH Battery for White LED Applications
SiP12501
Vishay Siliconix
Boost Converter for Single/Double AA Cell or NiMH Battery for
White LED Applications
DESCRIPTION
SiP12501 is a boost converter IC for single or double cell
NiMH or Alkaline battery pack, which can drive white LEDs
connected in parallel to provide backlight in hand-held
devices. Designed with an internal low threshold power
MOSFET, it is capable of starting up with a low battery
voltage of 0.65 V. For best efficiency performance, the
SiP12501 is designed to operate in PWM mode with 600 kHz
switching. The voltage-mode PWM design is internally
compensated, reducing the external parts count. It accepts
input voltages from 0.65 V to 3.3 V, regulates output current
of up to 60 mA from a 0.9 V input. The LED current can be
adjusted externally for its brightness control. SiP12501
features low shutdown current of under 1 µA, internal power
MOS, thermal shutdown protection and antiringing control.
SiP12501 is available in a lead (Pb)-free 6 pin, PowerPAK
MLP33 package and is specified to operate over the
industrial temperature range of - 40 °C to 85 °C.
FEATURES
• Voltage mode control with internal frequency
compensation
• 0.65 V to 3.3 V input voltage range
• Low startup voltage: 0.65 V
• PWM control with 600 kHz fixed switching frequency
• Analog control of LED intensity
• Power supply from output voltage
• Regulated output current
• Integrated UVLO and soft-start
• Logic controlled shutdown (< 1 µA)
• High efficiency: typical 75 %
• Internal power MOS
• Antiringing switch to minimize EMI
• Thermal shutdown
• Minimum external components
• PowerPAK® MLP33-6 package
APPLICATIONS
• White LED backlighting
• Handheld devices
• Digital cameras
• Portable applications
• LCD bias supplies
TYPICAL APPLICATION CIRCUIT
VIN
10 µF
XSHD
2
VIN
1
XSHD
10 µH
6
LX
MBR0520
SiP12501
5
GND
4
FB
VOUT
3
4.7 µF
15 Ω
15 Ω
15 Ω
15 Ω
Document Number: 73192
S09-1455-Rev. B, 03-Aug-09
www.vishay.com
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