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Part: LP2985A-26D
Category:
Description: LP2985A-XX; Very Low Noise, Low Dropout, 150 ma Linear Regulator, CMOS Process Technology
Company: Philips Semiconductors
Datasheet: Download LP2985A-26D datasheet File size : 606 kB
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INTEGRATED CIRCUITS
LP2985A-XX Very low noise, low dropout, 150 mA linear regulator, CMOS process technology
Product data Supersedes data of 2003 Jul 31 2003 Aug 18
Philips Semiconductors
Philips Semiconductors
Product data
Very low noise, very low dropout, 150 mA linear regulator, CMOS process technology
LP2985A-XX
GENERAL DESCRIPTION
The LP2985A-XX family are very low-noise, very low-dropout, low quiescent-current linear regulators designed for battery-powered applications, although they can also be used for devices powered by AC-DC converters. The parts are available in a range of preset output voltages from 2.5 V to 4.5 V. Typical dropout voltages are only 165 mV at 150 mA and 41 mV at 50 mA. Reverse battery current is extremely low, 0.5 µA typical. For demanding applications, output noise voltage of typically 30 µVrms is achieved with a 0.01 µF capacitor on the bypass pin. The input voltage can vary from 2.5 to 6.5 Vdc, providing up to 150 mA output current. An internal P-channel FET pass transistor maintains an 85 µA typical supply current, independent of the load current and dropout voltage. Other features include a 0.01 µA logic-controlled shutdown, short circuit and thermal shutdown protection, and reverse battery protection. The LP2985A-XX also includes an auto-discharge function which actively dischargers the output voltage to ground when the device is placed in shutdown. To accommodate high density layouts, it is packaged in wafer-level chip-scale package (WL-CSP5) and regular SO5/SOT23-5 package.
WL-CSP5 (bottom view)
SO5 (SOT23-5)
FEATURES
· Low output noise: 30 µVrms · Low dropout voltages: 165 mV at 150 mA, 41 mV at 50 mA · Thermal overload and short circuit protection · Reverse battery protection · Output current limit · 85 µA no load supply current · 100 µA typical operating supply current at IOUT = 150 mA · Preset output voltage of 2.7 V, 2.8 V, and 3.0 V;
other voltages upon request in 100 mV increments
APPLICATIONS
· Cordless, PCS, and cellular telephones · PCMCIA cards and modems · Handheld and portable instruments · Palmtop computers and electronic planners
SIMPLIFIED DEVICE DIAGRAM
LP2985A-XX
ON OFF SHDN A3 B2 VOUT A1 C1 C3 CIN 1 µF DC 2.5 V to 6.5 V VIN
GND C BP
bypass
R load (optional)
COUT 1 µF
Preset output voltages: 2.5 V to 4.5 V
Top view (Wafer-level CSP pin assignments using JEDEC standard matrix)
SL01866
Figure 1. Simplified device diagram.
2003 Aug 18
2
Philips Semiconductors
Product data
Very low noise, very low dropout, 150 mA linear regulator, CMOS process technology
LP2985A-XX
ORDERING INFORMATION
PACKAGE TYPE NUMBER NUMBER LP2985A-XXUK LP2985A-XXD NAME WL-CSP5 SO5/SOT23-5 DESCRIPTION wafer-level, chip-scale 5 bump package, surface mount plastic small outline package; 5 leads; body width 1.5 mm TEMPERATURE RANGE 40 to +85 °C 40 to +85 °C
NOTE: The device has three (3) voltage output options, indicated by the XX on the Type Number. Additional voltage output options may be available (see Table 1). XX LP2985A-27 LP2985A-28 LP2985A-30 VOLTAGE (Typical) 2.7 V 2.8 V 3.0 V
Table 1. Marking code
Each device is marked with a four letter code. The first three letters designate the product. The fourth letter, represented by `x', is a date tracking code. Part LP2985A-27D, LP2985A-27UK LP2985A-28UK LP2985A-30UK LP2985A-25D (Note 1) LP2985A-26D (Note 1) LP2985A-28D LP2985A-30D LP2985A-33D (Note 1) LP2985A-36D (Note 1) LP2985A-42D (Note 1) LP2985A-45D (Note 1) 1. Consult factory for availability. Marking ACCx ACAx AMPx APXx APYx APZx ARAx ARBx ARCx ARDx AREx
PIN CONFIGURATION
LP2985A-XX
SHDN A3 B2 GND A1 BP C1 VOUT C3 VIN
PIN DESCRIPTION
BALL NO. A1 PIN NO. 2 SYMBOL GND DESCRIPTION Ground. The bump may also serve as heat spreader by soldering it to a large PCB pad or circuit board ground plane to maximize power dissipation. Regulator output. Sources up to 150 mA. Minimum output capacitor is 1 µF. Noise Bypass Pin: Low noise of typically 30 mVrms with optional 0.01 µF bypass capacitor. Larger bypass capacitor further reduces noise. Active-LOW Shutdown Input. This pin must be actively terminated. Tie to VIN if this function is not used. Regulator Input. Supply voltage ranges from 2.5 V to 6.5 V. Bypass with a 1 µF capacitor to GND.
C1
5
VOUT
SL01867
B2 Figure 2. WL-CSP5 pin configuration (UK package).
4
BP
A3
VIN 1 5 VOUT
3
SHDN
LP2985A
GND 2
C3
SHDN 3 4 BP
1
VIN
SL02028
Figure 3. SO5/SOT23-5 pin configuration (D package).
2003 Aug 18
3
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