LP5952 반도체 회로 부품 판매점
Dual Rail Linear Regulator
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 National Semiconductor |
January 2007
LP5952
350mA Dual Rail Linear Regulator
General Description
The LP5952 is a Dual Supply Rail Linear Regulator optimized
for powering ultra-low voltage circuits from a single Li-Ion cell
or 3 cell NiMH/NiCd batteries.
In the typical post regulation application VBATT is directly con-
nected to the battery (range 2.5V...5.5V) and VIN is supplied
by the output voltage of the DC-DC Converter (range 0.7V...
4.5V).
The device offers superior dropout and transient features
combined with very low quiescent currents. In shutdown
mode (Enable pin pulled low) the device turns off and reduces
battery consumption to 0.1µA (typ.).
The LP5952 also features internal protection against over-
temperature, over-current and under-voltage conditions.
Performance is specified for a -40°C to 125°C junction tem-
perature range.
The LP5952 is available in a micro SMD package, lead free.
The device is available in fixed output voltages in the range
of 0.5V to 2.0V. For availability, please contact your local NSC
sales office.
Features
■ Excellent load transient response: ±15mV typical
■ Excellent line transient response: ±1mV typical
■ 0.7V ≤ VIN ≤ 4.5V
■ 2.5V ≤ VBATT ≤ 5.5V
■ 0.5V ≤ VOUT ≤ 2.0V
■ For ILOAD = 350mA:
VBATT ≥ VOUT(NOM) + 1.5V or 2.5V whichever is higher
■ For ILOAD = 150mA:
VBATT ≥ VOUT(NOM) + 1.3V or 2.5V whichever is higher
■ 50µA typical quiescent current from VBATT
■ 10µA typical quiescent current from VIN
■ 0.1µA typical quiescent current in shutdown
■ Guaranteed 350mA output current
■ Noise voltage = 100µVRMS typical
■ Operates from a single Li-Ion cell or 3 cell NiMH/NiCd
batteries
■ Only one or two tiny surface-mount external components
required depending on application
■ Small 5 bump micro SMD package, lead free
■ Thermal-overload and short-circuit protection
■ -40°C to +125°C junction temperature range
Applications
■ Mobile Phones
■ Hand-Held Radios
■ Personal Digital Assistants
■ Palm-Top PCs
■ Portable Instruments
■ Battery Powered Devices
Typical Application Circuit
20208501
FIGURE 1: Typical Application Circuit with DC-DC Converter as Pre-Regulator for VIN
© 2007 National Semiconductor Corporation 202085
www.national.com
Connection Diagrams
FIGURE 2: Typical Application Circuit
20208502
20208503
FIGURE 3: Connection Diagram 5-Bump Thin Micro SMD Package, Large Bump, 0.5mm Pitch
See NS Package Number TLA05
20208506
FIGURE 4: Package Marking
Note: The actual physical placement of the package marking will vary from part to part. The package marking “X” designates the
date code. “T” is a NSC internal code for die traceability. Both will vary considerably. “U” identifies the device (part number, option,
etc.).
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LP5952 regulator
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