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INTEGRATED CIRCUITS
SA57026 300 mA LDO with ON/OFF control and independent delayed RESET function
Product data File under Integrated Circuits, Standard Analog 2001 Oct 03
Philips Semiconductors
Philips Semiconductors
Product data
300 mA LDO with ON/OFF control and independent delayed RESET function
SA57026
GENERAL DESCRIPTION
The SA57026 has an extremely precise fixed output with a typical accuracy of 2%. It is designed to provide very low dropout and low noise in CD-ROM drives, battery-operated systems, and portable computers applications. This regulator consists of an internal voltage reference, an error amplifier, a driver with current limiter, and a thermal shut-down mechanism. An Active-LOW RESET is assered when the detected voltage (VDET) falls below the reset voltage threshold. The RESET output remains low for 30 s (typical) when zero capacitance connected to Cd pin. The reset time delay can be adjusted by replacing cpacitance values from Cd pin to Ground. The device is available in the SOP-7B package.
FEATURES
* Very low dropout voltage: 500 mV typ. (Iout = 50 mA) * High precision output voltage: 2% * Output current capacity: 300 mA * Low noise: 40 mVrms typ. @ 20 Hz to 80 KHz and for Cn = 10 nF * Extremely good line regulation: 10 mV typical * Extremely good load regulation: 20 mV typical * Low temperature drift co-efficient to Vout: 100 ppm/C * Internal current limit and thermal shut-down circuits * Adjustment-free reset detection voltage: 4.2 V typ. * Delay time can be adjusted by external capacitor * Wide operating temperature range: -40 C to +85 C
BLOCK DIAGRAM
APPLICATIONS
* CD-ROM drives * Electronic notebooks, PDAs and palmtop computers * Cameras, VCRs and camcorders * PCMCIA cards * Modems * Battery-operated or hand-held instruments
4
VIN
5
VOUT
ON/OFF 3 THERMAL PROTECT 2 RESET
1 7
GND Cd
SL01528
Figure 1. Block diagram.
2001 Oct 03
2
853-2292 27197
Philips Semiconductors
Product data
300 mA LDO with ON/OFF control and independent delayed RESET function
SA57026
ORDERING INFORMATION
PACKAGE TYPE NUMBER SA57026 NAME SOP-7B DESCRIPTION small outline 7-pin surface mount (see dimensional drawing) TEMPERATURE RANGE -40 to +85 C
NOTE: The device has two reset threshold options. XX SA57026D SA57026F Output voltage (Typ.) 3.3 V 3.3 V Reset threshold (Typ.) 4.20 V 3.90 V
Part number marking
Part number SA57026DD SA57026FD Marking ALU ALV
PIN CONFIGURATION
PIN DESCRIPTION
PIN SYMBOL GND RESET Ground. RESET signal output pin. The output remains low while VDET is below the reset voltage threshold, and for an extnerl set time delay Cd pin after VDET rises above reset threshold. Output voltage on/off control pin. Connect to VIN if not used. ON/OFF = LOW: Voltage output (Pin 5) OFF ON/OFF = HIGH: Voltage output (Pin 5) ON Voltage supply input pin. Regulated voltage output pin. Ground pin and heat sink. Reset delay time capacitor pin. RESET pin output delay time can be set by capacitance connected to the Cd pin. tPLH = 100000 x C tPLH: transmission delay time (s). C: capacitor value (F). DESCRIPTION 1 2
GND RESET ON/OFF VIN
1 2
7
Cd
SA57026
3 4
6
GND
5
VOUT
3
ON/OFF
SL01529
Figure 2. Pin configuration.
4 5 6 7
VIN VOUT GND Cd
MAXIMUM RATINGS
SYMBOL VIN IOUT Toper Tstg PD Supply voltage Output current Operating temperature Storage temperature Power dissipation (Note 1) PARAMETER MIN. -0.3 0 -40 -40 - MAX. +10 400 +85 +125 800 UNIT V mA C C mW
NOTE: 1. When mounted on a 25 x 40 x 1 mm glass epoxy board.
2001 Oct 03
3
Philips Semiconductors
Product data
300 mA LDO with ON/OFF control and independent delayed RESET function
SA57026
ELECTRICAL CHARACTERISTICS
Tamb = 25 C; VON/OFF = 1.6 V, unless otherwise specified. SYMBOL Iccq1 Iccq2 Iccq3 Regulator VOUT Output voltage VIN = 5 V; IOUT = 30 mA SA57026D SA57025F VIN = 3.2 V; IOUT = 150 mA VIN = 4.4 to 5.5 V; IOUT = 30 mA VIN = 5 V; IOUT = 0 to 300 mA Tj = -20 to +85 C; VIN = 5 V VIN = 5 V; f = 120 Hz; Vripple = 1 Vp-p; IOUT = 30 mA VIN = 5 V; f = 20 to 80 kHz; Vripple = 1 Vp-p; IOUT = 30 mA VON/OFF = 1.6 V 3.25 3.25 - - - - - - - 1.6 -0.3 3.30 3.30 0.15 10 20 100 50 40 5 - - 3.35 3.35 0.3 20 120 - 80 120 10 VIN+0.3 0.4 V V V mV mV ppm/C dB Vrms A V V PARAMETER No-load input current 1 No-load input current 2 Input current (OFF) CONDITIONS VIN = 5 V; IOUT = 0 mA VIN = 4 V; IOUT = 0 mA VIN = 5 V; VON/OFF = 0.4 V MIN. - - - TYP. 3 4 250 MAX. 8 - - UNIT mA mA A
VIO V1 V2 VOUT/T RR Vn ION Vth(H) Vth(L) Reset VDET
Input/output differential voltage Line regulation Load regulation VOUT Temperature coefficient (Note 1) Ripple rejection (Note 1) Output noise voltage (Note 1) ON/OFF terminal current HIGH threshold voltage LOW threshold voltage
Detection voltage
VIN = HIGH-to-LOW SA57026D SA57025F Tj = -20 to +85 C VIN = HIGH-to-LOW-to-HIGH VIN = 3.9 V; RL = 4.7 k VIN = 5 V VIN = 3.9 V; RL = 0 VIN = 3.9 V; RL = 0 ; Tamb = -20 to +80 C Cd = 0.0 F VIN = 4 V to 5 V; Cd = 0.1 F
4.11 3.81 - 100 - - 5 3 - 5 -
4.20 3.90 100 - 100 - - - 30 10 30 0.65
4.29 3.99 - 200 200 0.1 - - 90 20 90 0.85
V V ppm/C mV mV A mA mA s ms s V
VS/T VS VOL ILO IOL1 IOL2 tPLH tPLH1 tPHL VOPL
VS temperature coefficient (Note 1) Hysteresis voltage LOW-level output voltage Output leakage current LOW-level output current 1 LOW-level output current 2 (Note 1) LOW-to-HIGH transmission delay time (Note 1) Reset delay time HIGH-to-LOW transmission delay time (Note 1) Threshold operating voltage
VOL = 0.4 V
-
NOTE: 1. The parameter is guaranteed by design.
2001 Oct 03
4
Philips Semiconductors
Product data
300 mA LDO with ON/OFF control and independent delayed RESET function
SA57026
APPLICATION INFORMATION Input capacitor
An input capacitor of 1 F is required to eliminate the AC coupling noise. This capacitor must be located as close as possible to VIN or GND pin (not more than 1 cm) and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitor will work. RESET output delay operation with an external capacitor from Cd pin to GND When the supply voltage crosses the release voltage (VDET) from a low value to a value higher than the released voltage (VDET), the Cd pin voltage starts to increase (charges up the external capacitor). While the RESET output remains at LOW state condition until the Cd pin voltage reaches the threshold operating voltage (VOPL) 0.4 V typical; after that, the RESET output is reversed to HIGH state condition. The transmission delay time (tPLH) can be set with the capacitance Cd of an external cpacitor as shown in Equation (1):
Output capacitor
Phase compensation is made for securing stable operation, even if the load current varies. For this reason, an output capacitor with good frequency characteristics is needed. Set it as close to the circuit as possible, with wires as short as possible. Tha value of the output capacitance has to be at least 47 F connected from VOUT to GND. When operating from sources other than batteries, supply-noise rejection and transient response can be improved by increasing the value of the input and output capacitors and employing passive filtering techniques.
t PLH + 10 6
C
Eqn. (1)
(Time is expressed in seconds; capacitance in Farads.)
PCB layout
The component placement around the LDO should be done carefully to achieve good dynamic line and load response. The input and noise capacitors should be kept close to the LDO. The rise in junction temperature depends on how efficiently the heat is carried away from the junction to ambient. The junction to lead thermal impedance is a characteristic of the package and fixed. The thermal impedance between lead to ambient can be reduced by increasing the copper area on the PCB. Increase the input, output and ground trace area to reduce the junction-to-ambient impedance.
ON/OFF
The regulator is fully enabled when a logic HIGH is applied to this input. The regulator enters shutdown when a logic LOW is appplied to this input. During shutdown, regulator output voltage falls to zero, RESET remains valid and supply current is reduced to 5 A (typ). If the function is not to be used, the ON/OFF pin should be tied to VIN.
RESET output
The SA57066 has an Active-LOW RESET output. The RESET output is driven Active-LOW within 30 s typical (when Cd is zero capacitance). The time delay can be adjusted up to 10 ms typical (when Cd is 0.1 F) of VDET falling through the reset voltage threshold. RESET is maintained Active-HIGH after VDET rises above thre reset threshold.
VIN 4 C 1 F R 4.7 k 2 RESET 3 1 6 5
VOUT
SA57026
7 Cd
COUT 47 F
R C 0.1 F
ON/OFF
SL01530
Figure 3. Typical application circuit.
2001 Oct 03
5
Philips Semiconductors
Product data
300 mA LDO with ON/OFF control and independent delayed RESET function
SA57026
PACKING METHOD
The SA57026 is packed in reels, as shown in Figure 4.
GUARD BAND
TAPE REEL ASSEMBLY
TAPE DETAIL
COVER TAPE
CARRIER TAPE
BARCODE LABEL
BOX
SL01305
Figure 4. Tape and reel packing method
2001 Oct 03
6
Philips Semiconductors
Product data
300 mA LDO with ON/OFF control and independent delayed RESET function
SA57026
SOP-7B: small outline 7-pin surface mount package
+0.1 -0.05 5.0 0.3 1.67 0.2 5 7 0.15
0.4 0.2 4.4 0.2 PIN #1 4 1.27 0.895 MAX 1.55 0.15 0.10 0.05 0.05 0.4 0.1 0.12
NOTE 1. Controlling dimensions are in millimeters (mm).
2001 Oct 03
7
0 - 10
6.2 0.3
Philips Semiconductors
Product data
300 mA LDO with ON/OFF control and independent delayed RESET function
SA57026
Data sheet status
Data sheet status [1] Objective data Preliminary data Product status [2] Development Qualification 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. Changes will be communicated according to the Customer Product/Process Change Notification (CPCN) procedure SNW-SQ-650A.
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.
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, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. 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. Philips Semiconductors 811 East Arques Avenue P.O. Box 3409 Sunnyvale, California 94088-3409 Telephone 800-234-7381 (c) Copyright Philips Electronics North America Corporation 2001 All rights reserved. Printed in U.S.A. Date of release: 10-01 Document order number: 9397 750 08968
Philips Semiconductors
2001 Oct 03 8

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