View NSC05584_994551.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MICROCIRCUIT DATA SHEET MNLP2956A-X REV 0A0
Original Creation Date: 08/09/94 Last Update Date: 07/08/97 Last Major Revision Date: 08/09/94
DUAL MICROPOWER LOW-DROPOUT VOLTAGE REGULATORS
General Description
The LP2956 is a micropower voltage regulator with very low quiescent current(170uA typical at light loads) and very low dropout voltage (typically 60mV at 1mA load current and 470mV at 250mA load current on the main output). The LP2956 retains all the desirable characteristics of the LP2951, but offers increased output current (main output), an auxiliary LDO adjustable regulated output (75mA), and additional features. The auxiliary output is always on (regardless of main output status), so it can be used to power memory circuits. Quiescent current increases only slightly at dropout, which prolongs battery life. The error flag goes low if the main output voltage drops out of regulation. An open-collector auxiliary comparator is included, whose inverting input is tied to the 1.23V reference. Reverse battery protection is provided. The parts are available in plastic DIP and surface mount packages.
Industry Part Number
LP2956A
NS Part Numbers
LP2956AMJ-QML
Prime Die
LP2956A
Controlling Document
5962-9554701QEA
Processing
MIL-STD-883, Method 5004
Subgrp Description
1 2 3 4 5 6 7 8A 8B 9 10 11 Static tests at Static tests at Static tests at Dynamic tests at Dynamic tests at Dynamic tests at Functional tests at Functional tests at Functional tests at Switching tests at Switching tests at Switching tests at
Temp ( oC)
+25 +125 -55 +25 +125 -55 +25 +125 -55 +25 +125 -55
Quality Conformance Inspection
MIL-STD-883, Method 5005
1
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Features
Output voltage adjusts from 1.23V to 29V. Guaranteed 250 mA current (main output). Auxiliary LDO (75 mA) adjustable output. Auxiliary comparator with open-collector output. Shutdown pin for main output. Extremely low quiescent current. Low dropout voltage. Extremely tight line and load regulation. Very low temperature coefficient. Current and thermal limiting. Reverse battery protection.
Applications
- High-efficiency linear regulator. - Low dropout battery-powered regulator. - uP system regulator with switchable high-current Vcc.
2
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
(Absolute Maximum Ratings)
(Note 1) Storage Temperature Range -65 C to +150 C Operating Junction Temperature Range -55 C to +125 C Lead Temperature (Soldering, 5 Seconds) Power Dissipation (Note 2, 3) Input Supply Voltage -20V to +30V Maximum Junction Temperature 150 C Feedback Input Voltage (Note 4) -0.3V to +5V Aux. Feedback Input Voltage (Note 4) -0.3V to +5V Shutdown Input Voltage (Note 4) -0.3V to +30V Comparator Input Voltage (Note 4, 5) -0.3V to +30V Comparator Output Voltage (Note 4, 5) -0.3V to +30V Thermal Resistance ThetaJA CERDIP (Still Air) (500LF/Min Air flow) ThetaJC (Note 3) CERDIP ESD Rating (Note 6) 260 C
Internally Limited
72 C/W 36 C/W
2 C/W
2kV Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature), ThetaJA (package junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any temperature is Pdmax = (Tjmax - TA)/ThetaJA or the number given in the Absolute Maximum Ratings, whichever is lower. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. See Application Hints for additional information on heat sinking and thermal resistance.
Note 2:
3
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
(Continued)
Note 3: The package material for these devices allows much improved heat transfer over our standard ceramic packages. In order to take full advantage of this improved heat transfer, heat sinking must be provided between the package base (directly beneath the die), and either metal traces on, or thermal vias through, the printed circuit board. Without this additional heat sinking, device power dissipation must be calculated using junction-to-ambient, rather than junction-to-case, thermal resistance. It must not be assumed that the device leads will provide substantial heat transfer out of the package, since the thermal resistance of the leadframe material is very poor, relative to the material of the package base. The stated junction-to-case thermal resistance is for the package material only, and does not account for the additional thermal resistance between the package base and the printed circuit board. The user must determine the value of the additional thermal resistance and must combine this with the stated value for the package, to calculate the total allowed power dissipation for the device. When used in dual-supply systems where the regulator load is returned to a negative supply, the output voltage must be diode-clamped to ground. May exceed the input supply voltage. All pins are rated for 2kV, except for the auxiliary feedback pin which is rated for 1.2kV (human body model, 100pF discharged through 1.5kOhms).
Note 4: Note 5: Note 6:
4
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
MAIN OUTPUT
(The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin=6V,Cl=2.2uF(Main Out.) and 10uF(Aux. Out.), Feedback pin is tied to 5V Tap pin,Cin=1uF,Vsd=0V,Main Out. pin is tied to Out. Sense pin, Aux. Out. is programmed for 5V. The main regulator output has a 1mA load, aux. regulator output has a 100uA load AC: SAME AS DC CONDITION SYMBOL Vo PARAMETER Output Voltage CONDITIONS NOTES PINNAME MIN 4.975 4.940 1mA < Il < 250mA Delta Vo / Delta t Delta Vo / Vo Delta Vo / Vo Vin - Vo Temperature Coefficient Line Regulation Vin = 6V to 30V 1 4.930 MAX 5.025 5.060 5.070 100 0.1 0.2 Load Regulation Il = 1mA to 250mA Il = 0.1mA to 1mA Dropout Voltage Il = 1mA 2 3 3 Il = 50mA 3 3 Il = 100mA 3 3 Il = 250mA 3 3 Ilimit Current Limit Rl = 1 Ohm 0.16 0.20 100 150 300 420 400 520 600 800 500 530 Delta Vo / Delta Pd Vfb Ifb Thermal Regulation Feedback Pin Voltage Feedback Pin Bias Current Output Leakage In Shutdown I(SD IN) > 1uA, Vin = 30V, Vout = 0V I(SD IN) > 1uA, Vin = 30V, Vout = 0V 4 1.215 0.2 1.245 40 60 Io(OFF) 10 20 UNIT V V V SUBGROUPS 1 2, 3 1, 2, 3
ppm/ 1, 2, C 3 % % % % mV mV mV mV mV mV mV mV mA mA %/W V nA nA uA uA 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 1 1 2, 3 1 2, 3
5
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
AUXILIARY OUTPUT
(The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin=6V,Cl=2.2uF(Main Out.) and 10uF(Aux. Out.), Feedback pin is tied to 5V Tap pin,Cin=1uF,Vsd=0V,Main Out. pin is tied to Out. Sense pin, Aux. Out. is programmed for 5V. The main regulator output has a 1mA load, aux. regulator output has a 100uA load AC: SAME AS DC CONDITION SYMBOL Vfb PARAMETER Feedback Pin Voltage Feedback Pin Bias Current Line Regulation 6V < Vin < 30V 6V < Vin < 30V Delta Vo / Vo Vin - Vo Load Regulation Il = 0.1mA to 1mA Il = 1mA to 75mA Dropout Voltage Il = 1mA 5 CONDITIONS NOTES PINNAME MIN 1.22 1.21 Ifb MAX 1.25 1.26 20 30 Delta Vo / Vo 0.3 0.5 0.3 0.6 200 300 Il = 50mA 600 700 Il = 75mA 700 850 Ilim Current Limit Vout = 0V 6 6 Delta Vo/Delta Pd Thermal Regulation 4 200 250 0.5 UNIT V V nA nA % % % % mV mV mV mV mV mV mA mA %/W SUBGROUPS 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1, 2, 3
6
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
DROPOUT DETECTION COMPARATOR
(The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin=6V,Cl=2.2uF(Main Out.) and 10uF(Aux. Out.), Feedback pin is tied to 5V Tap pin,Cin=1uF,Vsd=0V,Main Out. pin is tied to Out. Sense pin, Aux. Out. is programmed for 5V. The main regulator output has a 1mA load, aux. regulator output has a 100uA load AC: SAME AS DC CONDITION SYMBOL Ioh PARAMETER Output "High" Leakage Output "Low" Voltage Upper Threshold Voltage Lower Threshold Voltage Voh = 30V CONDITIONS NOTES PINNAME MIN 1 2 Vol Vin = 4V Io (COMP) = 400uA VThr (max) 7 7 VThr (min) 7 7 -320 -380 -450 -640 250 400 -150 -100 -230 -160 MAX UNIT uA uA mV mV mV mV mV mV SUBGROUPS 1 2, 3 1 2, 3 1 2, 3 1 2, 3
SHUTDOWN INPUT
(The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin=6V,Cl=2.2uF(Main Out.) and 10uF(Aux. Out.), Feedback pin is tied to 5V Tap pin,Cin=1uF,Vsd=0V,Main Out. pin is tied to Out. Sense pin, Aux. Out. is programmed for 5V. The main regulator output has a 1mA load, aux. regulator output has a 100uA load AC: SAME AS DC CONDITION Iin Vih Input Current to Disable Output Shutdown Input High Threshold Shutdown Input Low Threshold I(sd in) > 1uA I(sd in) > 1uA Vil Vo > 4.5V Vo > 4.5V 8 900 1200 400 200 0.5 uA mV mV mV mV 1, 2, 3 1 2, 3 1 2, 3
7
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
AUXILIARY COMPARATOR
(The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin=6V,Cl=2.2uF(Main Out.) and 10uF(Aux. Out.), Feedback pin is tied to 5V Tap pin,Cin=1uF,Vsd=0V,Main Out. pin is tied to Out. Sense pin, Aux. Out. is programmed for 5V. The main regulator output has a 1mA load, aux. regulator output has a 100uA load AC: SAME AS DC CONDITION SYMBOL Vt(High) PARAMETER Upper Trip Point CONDITIONS NOTES 9 9 Vt(Low) Lower Trip Point 9 9 Ioh Output "HIGH" Leakage Output "LOW" Leakage Input Bias Current Voh = 30V Vin(COMP) = 1.3V Vol Vin(COMP) = 1.1V Io(COMP) = 400uA Ib 0 < Vin(COMP) < 5V 0 < Vin(COMP) < 5V -30 -50 PINNAME MIN 1.20 1.19 1.19 1.18 MAX 1.28 1.29 1.27 1.28 1 2 250 400 30 50 UNIT V V V V uA uA mV mV nA nA SUBGROUPS 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3
8
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Electrical Characteristics
GROUND PIN CURRENT
(The following conditions apply to all the following parameters, unless otherwise specified.) DC: Vin=6V,Cl=2.2uF(Main Out.) and 10uF(Aux. Out.), Feedback pin is tied to 5V Tap pin,Cin=1uF,Vsd=0V,Main Out. pin is tied to Out. Sense pin, Aux. Out. is programmed for 5V. The main regulator output has a 1mA load, aux. regulator output has a 100uA load AC: SAME AS DC CONDITION SYMBOL Ignd PARAMETER Ground Pin Current CONDITIONS Il (Main Out) = 1mA Il (Aux. Out) = 0.1mA Il (Main Out) = 50mA Il (Aux. Out) = 1mA Il (Main Out) = 100mA Il (Aux. Out) = 1 mA Il (Main Out) = 250mA Il (Aux. Out) = 1mA NOTES 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 10 180 200 uA uA 1 2, 3 PINNAME MIN MAX 250 280 2 2.5 6 8 28 33 6 8 8 10 325 350 UNIT uA uA mA mA mA mA mA mA mA mA mA mA uA uA SUBGROUPS 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3 1 2, 3
Il (Main Out) = 1 mA Il (Aux. Out) = 50mA Il (Main Out) = 1mA
Il (Aux. Out) = 75mA Ignd Ground Pin Current at Dropout Vin = 4.5V Il (Main Out) = 0.1mA Il (Aux. Out) = 0.1mA Ignd Ground Pin Current at Shutdown Note 1: Note 2: No Load on Either Output I(sd in) > 1uA
Note 3:
Note 4:
Note 5:
Note 6:
Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. Load regulation is measured at constant junction temperature using low duty cycle pulse testing. Two separate tests are performed, one for the range of 100uA to 1mA and one for the 1mA to 250mA range. Changes in output voltage due to heating effects are covered by the thermal regulation specification. Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below the value measured with a 1V differential. At very low values of programmed output voltage, the input voltage minimum of 2V (2.3V over temperature) must be observed. Thermal regulation is the change in output voltage at a time T after a change in power dissipation, excluding load or line regulation effects. Specifications are for a 200mA load pulse at Vin = 20V (3W pulse) for T = 10ms on the Main regulator output. For the Auxiliary regulator output, specifications are for a 66mA load pulse at Vin = 20V (1W pulse) for T = 10ms. Load regulation is measured at constant junction temperature using low duty cycle pulse testing. Two separate tests are performed, one for the range of 100uA to 1mA and one for the 1mA to 75mA range. Changes in output voltage due to heating effects are covered by the thermal regulation specification. The auxiliary regulator output has foldback limiting, which means the output current reduces with output voltage. The tested limit is for Vout = 0V, so the output current will be higher at higher output voltage.
9
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
(Continued)
Dropout dectection comparator thresholds are expressed as changes in a 5V output. To express the threshold voltages in terms of a differential at the Feedback terminal, divide by the error amplifier gain = Vout/Vref. Note 8: The shutdown input equivalent circuit is the base of a grounded-emitter NPN transistor in series with a current-limiting resistor. Pulling the shutdown input high turns off the main regulator. For more details, see Application Hints. Note 9: This test is performed with the auxiliary comparator output sinking 400uA of current. At the upper trip point, the comparator output must be >2.4V. At the low trip point, the comparator output must be <0.4V. Note 10: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the ground pin current, output load current, and current through the external resistive dividers (if used). Note 7:
10
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Graphics and Diagrams
GRAPHICS# 6270HRA2 J16ARL CERDIP (J), 16 LEAD (B/I CKT) CERDIP (J), 16 LEAD (P/P DWG) DESCRIPTION
See attached graphics following this page.
11
MNLP2956A-X REV 0A0
MICROCIRCUIT DATA SHEET
Revision History
Rev
0A0
ECN #
Rel Date
Originator
Barbara Lopez
Changes
Initial Release of: MNLP2956A-X Rev. 0A0. Added note for power dissipation and reference to thermal resistance for Aluminum Nitride package.
M0000610 07/08/97
12

▲Up To Search▲

Price & Availability of NSC05584

	To Download NSC05584 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .