SIP12503 Datasheet, PDF (1/11 Pages) Vishay Siliconix – 500-mA - Adjustable Boost Converter for Single or Dual Cell

SiP12503
Vishay Siliconix
500-mA - Adjustable Boost Converter for Single or Dual Cell
DESCRIPTION
SiP12503 is a boost converter IC with adjustable output
voltage for single or dual cell NiMH or Alkaline battery pack.
Featuring with an internal low resistance power MOSFET, it
is capable of starting up with a low battery voltage of 0.85 V.
It only needs six external components (an inductor, a diode,-
two capacitors and two resistors) to construct a step-up
converter. For best efficiency performance, it is designed to
operate in PWM mode with 300 kHZ switching frequency
under normal load and in PFM mode under light load. The
voltage-mode control loop is internally compensated,
simplifying converter design and reducing external parts
count. It accepts input voltages from 0.85 V to 5.0 V, and
adjustable output voltages from 2 V to 5 V. It also features
low shutdown current of under 1 µA, over voltage protection,
thermal shutdown protection, and antiring control to minimize
EMI.
SiP12503 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
• 0.85 V to 5.0 V input voltage range
• Adjustable output voltage range from 2.0 V to 5.0 V
• Low startup voltage: 0.65 V
• PWM control with 300 kHz fixed switching frequency
• PFM control for light load
• Powered from the output voltage supply
• Integrated UVLO and soft-start
• Logic controlled shutdown (< 1 µA)
• 85 % typical efficiency
• Internal power MOS switch: 0.2 Ω at 3.3 V output
• Antiringing switch to minimize EMI
• Shutdown input
• Thermal shutdown
• Minimum external components
• PowerPAK^® MLP33-6 package (DFN-6, 3 x 3)
• Over voltage protection
APPLICATIONS
• Portable applications
• Battery-powered equipment
• Handheld devices
• Digital cameras
• Wireless handsets
• LCD and OLED bias
TYPICAL APPLICATION CIRCUIT
V_IN
10 µF
XSHD
2
V_IN
1
XSHD
10 µH
6
LX
SiP12503
MBR0520
450 KΩ
47 µF
V_OUT
3
V_OUT
FB
4
GND
5
100 KΩ
Document Number: 73579
S09-1454-Rev. B, 03-Aug-09
www.vishay.com
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