View LP2985-XX_237932.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

INTEGRATED CIRCUITS
LP2985-XX Micropower 150 mA low noise, low dropout linear regulator
Product data Supersedes data of 2003 Oct 17 2003 Oct 31
Philips Semiconductors
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
GENERAL DESCRIPTION
The LP2985-XX is a 150 mA, fixed output voltage regulator designed to provide very low dropout and low noise in battery powered and portable applications. The output voltage is preset to 1.5, 1.8, 2.8, 3.0, 3.3, 3.6, or 5.0 V. Designed with an optimized PNP process, the LP2985-XX achieves unequalled performance in all specifications critical to battery-powered designs such as low supply-current, low dropout voltage, low power consumption, small size, fast dynamic response to line and load, precision output, etc. This regulator consists of an internal voltage reference, an error amplifier, a driver with current limiter and a thermal shut-down mechanism. The LP2985-XX is housed in a small outline 5-lead package (SOT23-5/SOP003).
FEATURES
* Very low consumption current: 85 mA typ. (when not loaded),
0.1 mA max. (when off)
APPLICATIONS
* Very low dropout voltage: 100 mV typ. (IOUT = 50 mA) * High precision output voltage: 2% * Output current capacity: 150 mA * Low noise: 30 mVRMS @ 20 Hz to 80 kHz (Cn= 10 nF) * Good line regulation: 0.01%/V typ. * Good load regulation: 30 mV typ. (IOUT = 1 to 150 mA) * Low temperature drift co-efficient to VOUT: 100 ppm/C * Built-in current limit and thermal shut-down * Wide operating temperature range: -40 to +85 C * Preset output voltages: 1.5, 1.8, 2.5, 2.8, 3.0, 3.3, 3.6, or 5.0 V
SIMPLIFIED DEVICE DIAGRAM
LP2985-XX
VIN 1
* Cellular phones, cordless phones, and 2-way radios * Electronic notebooks, PDAs and palmtop computers * Cameras, VCRs and camcorders * PCMCIA cards * Modems * Battery-powered or hand-held instruments
5
VOUT
3 ON/OFF
BIAS
CURRENT LIMIT DRIVER
REFERENCE NOISE 4
THERMAL SHUTDOWN GND 2
SL01545
Figure 1. Simplified device diagram.
2003 Oct 31
2
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
ORDERING INFORMATION
PACKAGE TYPE NUMBER LP2985-XXD DESCRIPTION Plastic small outline package; 5 leads; body width 1.6 mm VERSION SOP003 TEMPERATURE RANGE -40 to +85 C
NOTE: The device has eight voltage output options, indicated by the XX on the Type Number. XX 15 18 25 28 30 33 36 50 VOLTAGE (Typical) 1.5 V 1.8 V 2.5 V 2.8 V 3.0 V 3.3 V 3.6 V 5.0 V
Part number marking
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 number LP2985-15D LP2985-18D LP2985-25D LP2985-28D LP2985-30D LP2985-33D LP2985-36D LP2985-50D Marking ANLx AABx ASJx AACx ABGx ABHx ANBx ABJx
PIN CONFIGURATION
PIN DESCRIPTION
PIN SYMBOL VIN GND ON/OFF NOISE VOUT Voltage input. Device ground. ON/OFF control pin. Connect to VIN if not used. Noise decrease pin, for connecting external capacitor. Voltage output. DESCRIPTION 1 2 3 4
4 NOISE
VIN
1
5
VOUT
LP2985-XX
GND
2
ON/OFF
3
5
SL01544
Figure 2. Pin configuration.
MAXIMUM RATINGS
SYMBOL VIN Toper Tstg PD Supply voltage Operating temperature Storage temperature Power dissipation PARAMETER MIN. -0.3 -40 -40 - MAX. +12.0 +85 +150 150 UNIT V C C mW
2003 Oct 31
3
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
ELECTRICAL CHARACTERISTICS
Tamb = 25 C, VIN = VOUT(nom) + 1 V, VON/OFF = 2.0 V, unless otherwise specified. SYMBOL ICC ICC(OFF) VOUT PARAMETER No-load input current Standby input current Output voltage LP2885-15 LP2885-18 LP2885-25 LP2885-28 LP2885-30 LP2885-33 LP2885-36 LP2885-50 VIN-VOUT VLNR VLDR VOUT/T RR1 RR2 Vn ION/OFF VOFF VON Dropout voltage Line regulation Load regulation VOUT temperature coefficient Ripple rejection 1 Ripple rejection 2 Output noise voltage ON/OFF pin input current ON/OFF low threshold voltage ON/OFF high threshold voltage VIN = VOUT(typ) + 1 to 10 V VIN = VOUT(typ) + 1 to 10 V IOUT = 1 to 150 mA -30 C Tj +85 C f = 120 Hz; Vripple = 1 V f = 1 kHz; Cn = 0.01 F; Vripple = 1 V fBW = 20 Hz to 80 kHz; Cn = 0.01 F VON/OFF = 5.0 V IOUT = 0 mA VON/OFF CONDITIONS MIN. - - 98 1.47 1.764 2.45 2.744 2.940 3.234 3.528 4.900 - - - - 50 - - - -0.3 1.6 TYP. 85 0 - 1.5 1.8 2.5 2.8 3.0 3.3 3.6 5.0 0.1 10 30 100 70 60 30 5 - - MAX. 130 0.1 102 1.53 1.836 2.55 2.856 3.060 3.366 3.672 5.100 0.2 20 90 - - - - 15 0.4 VIN + 0.3 UNIT A A % Vnom V V V V V V V V V mV mV ppm/C dB dB VRMS A V V
2003 Oct 31
4
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
TYPICAL PERFORMANCE CURVES
2.8 V product. Except where noted otherwise, Tamb = 25 C; VIN = Vo + 1 V; Vcont = 2 V; Ci = 1 F; Co = 1 F; Cn = 0.01 F.
3.5 3.0 VO, OUTPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0.0 0 2 4 6 8 10 12 VIN, INPUT VOLTAGE (V) RL = 2.8 k RL = 93 RL = 19 0.0 0 2 4 6 8 10 12 VIN, INPUT VOLTAGE (V) I IN , INPUT CURRENT (mA) 1.5 RL =
1.0
0.5
SL02130
SL02131
Figure 3. Output voltage versus input voltage.
Figure 4. Input current versus input voltage.
2.90
2.845 RL = 2.8 k
VO, OUTPUT VOLTAGE (V)
VO, OUTPUT VOLTAGE (V) 0 100 150 200 300
2.85
2.840
2.80
2.835
2.75
2.830
2.70 50 250 IO, OUTPUT CURRENT (mA)
2.825 2 4 6 8 10 12 VIN, INPUT VOLTAGE (V)
SL02132
SL02133
Figure 5. Load regulation.
Figure 6. LIne regulation.
0.5 VIN = 2.6 V 0.4 VO, OUTPUT VOLTAGE (V) VO, OUTPUT VOLTAGE (V)
2.90 RL = 2.8 k
2.85
0.3
2.80
0.2
2.75
0.1
0 0 50 100 150 200 250 IO, OUTPUT CURRENT (mA)
2.70 -50
-25
0
25
50
75
100
125
150
SL02134
AMBIENT TEMPERATURE, Tamb (C)
SL02135
Figure 7. Dropout voltage versus output current.
Figure 8. Output voltage versus Tamb.
2003 Oct 31
5
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
TYPICAL PERFORMANCE CURVES (continued)
2.8 V product. Except where noted otherwise, Tamb = 25 C; VIN = Vo + 1 V; Vcont = 2 V; Ci = 1 F; Co = 1 F; Cn = 0.01 F.
0 -10 RR, RIPPLE REJECTION (dB) -20 -30 -40 -50 -60 -70 -80 0.01 0.1 1 10 100 1000 f, FREQUENCY (kHz) Cn = 0.01 F IO = 100 mA 1O = 30 mA RR, RIPPLE REJECTION (dB) IO = 150 mA 0 -10 -20 -30 -40 -50 -60 -70 -80 0.01 0.1 1 10 100 1000 f, FREQUENCY (kHz) Cn = 0 F IO = 150 mA IO = 100 mA 1O = 30 mA
SL02136
SL02137
Figure 9. Ripple rejection (Cn = 0.01 F).
Figure 10. Ripple rejection (Cn = 0 F).
30 Vn , OUTPUT NOISE VOLTAGE ( Vrms )
200
GND PIN CURRENT (mA)
25
150
20
15
100
10
CC ,
50
5
I
0 0 50 100 150 200 250 IO, OUTPUT CURRENT (mA)
0 0.00001
0.0001
0.001
0.01
0.1
SL02138
Cn, NOISE REDUCTION CAPACITOR (F)
SL02139
Figure 11. GND pin current.
Figure 12. Output noise voltage.
10 Ci = Co = 1 F
10 Ci = Co = 0.47 F
1 ESR ( ) ESR ( )
1
0.1
STABLE AREA
0.1
STABLE AREA
0.01 0 50 100 150 200 250 IO, OUTPUT CURRENT (mA)
0.01 0 50 100 150 200 250 IO, OUTPUT CURRENT (mA)
SL02140
SL02141
Figure 13. ESR stability area (Ci = Co = 1 F).
Figure 14. ESR stability area (Ci = Co = 0.47 F).
2003 Oct 31
6
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
TYPICAL PERFORMANCE CURVES (continued)
2.8 V product. Except where noted otherwise, Tamb = 25 C; VIN = Vo + 1 V; Vcont = 2 V; Ci = 1 F; Co = 1 F; Cn = 0.01 F.
Ci = Co = 1 F, Cn = 0.01 F CH1=10mV DC 1 : 1 CH2=50mV AC 10 : 1 10 s/div CH1=10mV DC 1 : 1 100 mA IO: 50 mA/div IO: 50 mA/div CH2=50mV AC 10 : 1 Ci = Co = 0.47 F, Cn = 0.01 F 10 s/div
100 mA
GND
GND
Vo: 50 mV/div
Vo: 50 mV/div
SL02142
SL02143
Figure 15. Load transient response (IO = 0 100 mA); (Ci = Co = 1 F; Cn = 0.01 F).
Ci =0, Co = 1 F, Cn = 0.01 F CH1=2v DC 1 : 1 CH2=20mV AC 10 : 1 10 s/div
Figure 16. Load transient response (IO = 0 100 mA); (Ci = Co = 0.47 F; Cn = 0.01 F).
Ci =0, Co = 0.47 F, Cn = 0.01 F CH1=2V DC 1 : 1 CH2=20mV AC 10 : 1 10 s/div
4V VIN: 2 V/div VIN: 2 V/div
4V
GND
GND
Vo: 20 mV/div
Vo: 20 mV/div
SL02144
SL02145
Figure 17. Line transient response (VIN = 3.8 4.8 V; IO = 30 mA); (Ci = 0; Co = 1 F; Cn = 0.01 F).
VIN = Vcont = 0 3.8 V; IO = 30 mA CH1=2V DC 10 : 1 CH2=2V DC 10 : 1 100 s/div
Figure 18. Line transient response (VIN = 3.8 4.8 V; IO = 30 mA); (Ci = 0; Co = 0.47 F; Cn = 0.01 F).
VIN = 3.8 V; Vcont = 0 3.8 V; IO = 30 mA CH1=2V DC 10 : 1 4V CH2=2V DC 10 : 1 100 s/div
4V Cont: 2 V/div
VIN, Cont: 2 V/div
GND 4V
GND 4V
Vo: 2 V/div
GND
Vo: 2 V/div
GND
SL02146
SL02147
Figure 19. Turn-on transient response Vin = Vcont = 0 3.8 V; IO = 30 mA)
Figure 20. Turn-on transient response Vin = 3.8 V; Vcont = 0 3.8 V; IO = 30 mA)
2003 Oct 31
7
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
TECHNICAL DISCUSSION
As illustrated in Figure 21, the LP2985-XX consists of a band-gap voltage reference, an error amplifier, P-channel pass transistor, current limit circuit and an internal feedback voltage divider. The output voltage is fed back through an internal resistor voltage divider connected to the VOUT pin. The reference is connected to the error amplifier's inverting input. The error amplifier compares the reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass transistor's gate is pulled lower, which allows more current to pass to the output and increase the
output voltage. If the feedback voltage is too high, the pass transistor gate is pulled up, allowing less current to pass to the output, resulting in a decrease in output voltage. An external bypass capacitor connected to the NOISE pin reduces noise at the output. Additional functional blocks include a current-limiter, thermal sensor and shut-down logic. The current-limiter monitors and controls the pass-transistor's gate voltage, limiting the output current to its specified maximum value. Thus it can withstand a short-circuited output for an indefinite amount of time without damaging the part.
LP2985-XX
VIN 1 5 VOUT
3 ON/OFF
BIAS
CURRENT LIMIT DRIVER
REFERENCE NOISE 4
THERMAL SHUTDOWN GND 2
SL01545
Figure 21. Block diagram.
2003 Oct 31
8
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
APPLICATION INFORMATION
The following points have to be kept in mind for good performance while using these devices:
Input Capacitor
An input capacitor of greater than 1 F is required between the LP2985-XX input pin and the circuit ground (the amount of capacitance may be increased without limit). This capacitor must be located as close as possible to the VIN or GND pin (not more than 1 cm away from the pin) and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor will work.
good frequency characteristics is needed. Set it as close to the circuit as possible and make the wiring as short as possible. The value of the output capacitance must be at least 1 F and must have B-type temperature characteristics. Also it must have the ESR (Equivalent Series Resistance) value within the stable range shown in the ESR versus IO plot.
ON/OFF (Chip Enable) Pin
The ON/OFF pin must be actively terminated, not floating. If the function is not to be used, the pin should be tied to VIN.
Line Impedance of VIN and GND
The VIN and GND lines should be sufficiently wide to minimize impedance. If the impedance of these lines is high, there is a chance to pick up noise or malfunction.
Output Capacitor
Phase compensation is used for securing stable operation even if the load current varies. For this reason, an output capacitor with
OUTPUT VOLTAGE 1 F 0.01 F
5 VOUT
4 NOISE
VIN 1
GND 2
ON/OFF 3
SUPPLY VOLTAGE 1 F
SL01546
Figure 22. Typical application circuit, device always ON.
TEST CIRCUITS
A 1 F TEST LOAD 5 VOUT 4 NOISE 0.01 F V
VIN 1 A
GND 2
ON/OFF 3
A SUPPLY VOLTAGE 1 F
SL01547
Figure 23. Test circuit.
2003 Oct 31
9
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
PACKING METHOD
The LP2985-XX is packed in reels, as shown in Figure 24.
GUARD BAND
TAPE REEL ASSEMBLY
TAPE DETAIL
COVER TAPE
CARRIER TAPE
BARCODE LABEL
BOX
SL01305
Figure 24. Tape and reel packing method
2003 Oct 31
10
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
Plastic small outline package; 5 leads; body width 1.6 mm
SOP003
2003 Oct 31
11
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
REVISION HISTORY
Rev _3 Date 20031031 Description Product data (9397 750 12242). ECN 853-2291 01-A14288 of 31 October 2003. Supersedes data of 17 Oct 2003 (9397 750 12098).
* Added 2.5 V output voltage option. * Features on page 2: "Wide operating temperature range: -30 to +85 C" changed to
"Wide operating temperature range: -40 to +85 C". _2 _1 20031017 20011003 Product data (9397 750 12098). ECN 853-2291 29545 of 14 February 2003. Supersedes data of 03 Oct 2001 (9397 750 08962). Product data (9397 750 08962). ECN 853-2291 27197 of 03 October 2001.
Modifications:
2003 Oct 31
12
Philips Semiconductors
Product data
Micropower 150 mA low noise, low dropout linear regulator
LP2985-XX
Data sheet status
Level
I
Data sheet status [1]
Objective data
Product status [2] [3]
Development
Definitions
This data sheet contains data from the objective specification for product development. Philips Semiconductors reserves the right to change the specification in any manner without notice. This data sheet contains data from the preliminary specification. Supplementary data will be published at a later date. Philips Semiconductors reserves the right to change the specification without notice, in order to improve the design and supply the best possible product. This data sheet contains data from the product specification. Philips Semiconductors reserves the right to make changes at any time in order to improve the design, manufacturing and supply. Relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN).
II
Preliminary data
Qualification
III
Product data
Production
[1] Please consult the most recently issued data sheet before initiating or completing a design. [2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL http://www.semiconductors.philips.com. [3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.
Definitions
Short-form specification -- The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see the relevant data sheet or data handbook. Limiting values definition -- Limiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability. Application information -- Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no representation or warranty that such applications will be suitable for the specified use without further testing or modification.
Disclaimers
Life support -- These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors for any damages resulting from such application. Right to make changes -- Philips Semiconductors reserves the right to make changes in the products--including circuits, standard cells, and/or software--described or contained herein in order to improve design and/or performance. When the product is in full production (status `Production'), relevant changes will be communicated via a Customer Product/Process Change Notification (CPCN). Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified.
Contact information
For additional information please visit http://www.semiconductors.philips.com. Fax: +31 40 27 24825
(c) Koninklijke Philips Electronics N.V. 2003 All rights reserved. Printed in U.S.A. Date of release: 10-03
For sales offices addresses send e-mail to: sales.addresses@www.semiconductors.philips.com.
Document order number:
9397 750 12242
Philips Semiconductors
2003 Oct 31 13

▲Up To Search▲

Price & Availability of LP2985-XX

	To Download LP2985-XX Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .