LP5952_08 Datasheet, PDF (1/16 Pages) National Semiconductor (TI) – 350mA Dual Rail Linear Regulator

June 10, 2008
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 V_BATT is directly con-
nected to the battery (range 2.5V...5.5V) and V_IN 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 device is available in a tiny 5-bump micro SMD and a 6-
pin Chip On Lead LLP 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 ≤ V}_IN ^{≤ 4.5V}
■ ^{2.5V ≤ V}_BATT ^{≤ 5.5V}
■ ^{0.5V ≤ V}_OUT ^{≤ 2.0V}
■ ^{For I}_LOAD ^{= 350mA:}
V_BATT ≥ V_OUT(NOM) + 1.5V or 2.5V whichever is higher
■ ^{For I}_LOAD ^{= 150mA:}
V_BATT ≥ V_OUT(NOM) + 1.3V or 2.5V whichever is higher
■ ^{50µA typical quiescent current from V}_BATT
■ ^{10µA typical quiescent current from V}_IN
■ ^{0.1µA typical quiescent current in shutdown}
■ ^{Guaranteed 350mA output current}
■ ^{Noise voltage = 100µV}_RMS ^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, thin 5-bump micro SMD package and 6-pin Chip On}
Lead LLP 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
FIGURE 1. Typical Application Circuit with DC-DC Converter as Pre-Regulator for V_IN
20208501
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