Document Outline
- GENERAL DESCRIPTION
- FEATURES
- APPLICATIONS
- BLOCK DIAGRAM
- ORDERING INFORMATION
- PIN CONFIGURATION
- PIN DESCRIPTION
- MAXIMUM RATINGS
- ELECTRICAL CHARACTERISTICS
- APPLICATION INFORMATION
- PACKING METHOD
- PACKAGE OUTLINE
- REVISION HISTORY
- Data sheet status
- Definitions
- Disclaimers
Philips
Semiconductors
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
Product data
Supersedes data of 2001 Oct 03
2003 Oct 13
INTEGRATED CIRCUITS
Philips Semiconductors
Product data
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
2
2003 Oct 13
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
(V
DET
) 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 7-pin small outline package (SOP002).
FEATURES
Very low dropout voltage: 500 mV typ. (I
out
= 50 mA)
High precision output voltage:
2%
Output current capacity: 300 mA
Low noise: 40 mV
rms
typ. @ 20 Hz to 80 KHz and for C
n
= 10 nF
Extremely good line regulation: 10 mV typical
Extremely good load regulation: 20 mV typical
Low temperature drift co-efficient to V
out
:
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
APPLICATIONS
CD-ROM drives
Electronic notebooks, PDAs and palmtop computers
Cameras, VCRs and camcorders
PCMCIA cards
Modems
Battery-operated or hand-held instruments
BLOCK DIAGRAM
2
1
7
5
4
THERMAL
PROTECT
3
V
IN
V
OUT
RESET
GND
Cd
ON/OFF
SL01528
Figure 1. Block diagram.
Philips Semiconductors
Product data
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
2003 Oct 13
3
ORDERING INFORMATION
TYPE NUMBER
PACKAGE
TEMPERATURE
TYPE NUMBER
DESCRIPTION
VERSION
RANGE
SA57026
small outline 7-pin surface mount (see dimensional drawing)
SOP002
40 to +85
C
NOTE:
The device has two reset threshold options.
XX
Output voltage (Typ.)
Reset threshold (Typ.)
SA57026D
3.3 V
4.20 V
SA57026F
3.3 V
3.90 V
Part number marking
Part number
Marking
SA57026DD
A L U
SA57026FD
A L V
PIN CONFIGURATION
SL01529
1
2
4
5
7
Cd
V
OUT
V
IN
RESET
GND
SA57026
3
ON/OFF
6
GND
Figure 2. Pin configuration.
PIN DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1
GND
Ground.
2
RESET
RESET signal output pin. The output remains
low while V
DET
is below the reset voltage
threshold, and for an extnerl set time delay
Cd pin after V
DET
rises above reset
threshold.
3
ON/OFF
Output voltage on/off control pin. Connect to
V
IN
if not used.
ON/OFF = LOW: Voltage output (Pin 5) OFF
ON/OFF = HIGH: Voltage output (Pin 5) ON
4
V
IN
Voltage supply input pin.
5
V
OUT
Regulated voltage output pin.
6
GND
Ground pin and heat sink.
7
Cd
Reset delay time capacitor pin.
RESET pin output delay time can be set by
capacitance connected to the Cd pin.
t
PLH
= 100000 x C
t
PLH
: transmission delay time (s).
C: capacitor value (F).
MAXIMUM RATINGS
SYMBOL
PARAMETER
MIN.
MAX.
UNIT
V
IN
Supply voltage
0.3
+10
V
I
OUT
Output current
0
400
mA
T
oper
Operating temperature
40
+85
C
T
stg
Storage temperature
40
+125
C
P
D
Power dissipation (Note 1)
800
mW
NOTE:
1. When mounted on a 25
40
1 mm glass epoxy board.
Philips Semiconductors
Product data
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
2003 Oct 13
4
ELECTRICAL CHARACTERISTICS
T
amb
= 25
C; V
ON/OFF
= 1.6 V, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
I
ccq1
No-load input current 1
V
IN
= 5 V; I
OUT
= 0 mA
3
8
mA
I
ccq2
No-load input current 2
V
IN
= 4 V; I
OUT
= 0 mA
4
mA
I
ccq3
Input current (OFF)
V
IN
= 5 V; V
ON/OFF
= 0.4 V
250
A
Regulator
V
OUT
Output voltage
V
IN
= 5 V; I
OUT
= 30 mA
SA57026D
3.25
3.30
3.35
V
SA57025F
3.25
3.30
3.35
V
V
IO
Input/output differential voltage
V
IN
= 3.2 V; I
OUT
= 150 mA
0.15
0.3
V
V1
Line regulation
V
IN
= 4.4 to 5.5 V; I
OUT
= 30 mA
10
20
mV
V2
Load regulation
V
IN
= 5 V; I
OUT
= 0 to 300 mA
20
120
mV
V
OUT
/
T
V
OUT
Temperature coefficient
(Note 1)
T
j
= 20 to +85
C; V
IN
= 5 V
100
ppm/
C
RR
Ripple rejection (Note 1)
V
IN
= 5 V; f = 120 Hz; V
ripple
= 1 V
pp
;
I
OUT
= 30 mA
50
80
dB
V
n
Output noise voltage (Note 1)
V
IN
= 5 V; f = 20 to 80 kHz;
V
ripple
= 1 V
pp
; I
OUT
= 30 mA
40
120
V
rms
I
ON
ON/OFF terminal current
V
ON/OFF
= 1.6 V
5
10
A
V
th(H)
HIGH threshold voltage
1.6
V
IN
+0.3
V
V
th(L)
LOW threshold voltage
0.3
0.4
V
Reset
V
DET
Detection voltage
V
IN
= HIGH-to-LOW
SA57026D
4.11
4.20
4.29
V
SA57025F
3.81
3.90
3.99
V
V
S
/
T
V
S
temperature coefficient (Note 1)
T
j
= 20 to +85
C
100
ppm/
C
V
S
Hysteresis voltage
V
IN
= HIGH-to-LOW-to-HIGH
100
200
mV
V
OL
LOW-level output voltage
V
IN
= 3.9 V; R
L
= 4.7 k
100
200
mV
I
LO
Output leakage current
V
IN
= 5 V
0.1
A
I
OL1
LOW-level output current 1
V
IN
= 3.9 V; R
L
= 0
5
mA
I
OL2
LOW-level output current 2 (Note 1)
V
IN
= 3.9 V; R
L
= 0
;
T
amb
= 20 to +80
C
3
mA
t
PLH
LOW-to-HIGH transmission delay
time (Note 1)
Cd = 0.0
F
30
90
s
t
PLH1
Reset delay time
V
IN
= 4 V to 5 V; Cd = 0.1
F
5
10
20
ms
t
PHL
HIGH-to-LOW transmission delay
time (Note 1)
30
90
s
V
OPL
Threshold operating voltage
V
OL
= 0.4 V
0.65
0.85
V
NOTE:
1. The parameter is guaranteed by design.
Philips Semiconductors
Product data
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
2003 Oct 13
5
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 V
IN
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.
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 V
OUT
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.
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 V
IN
.
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 V
DET
falling through the reset voltage
threshold. RESET is maintained Active-HIGH after V
DET
rises above
thre reset threshold.
RESET output delay operation with an external capacitor from
Cd pin to GND
When the supply voltage crosses the release voltage (V
DET
) from a
low value to a value higher than the released voltage (V
DET
), 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 (V
OPL
) 0.4 V
typical; after that, the RESET output is reversed to HIGH state
condition.
The transmission delay time (t
PLH
) can be set with the capacitance
Cd of an external cpacitor as shown in Equation (1):
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.
SA57026
5
V
OUT
7
2
4
6
1
3
Cd
C
0.1
F
C
OUT
47
F
R
ON/OFF
R
4.7 k
V
IN
RESET
C
1
F
SL01530
Figure 3. Typical application circuit.
Philips Semiconductors
Product data
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
2003 Oct 13
6
PACKING METHOD
The SA57026 is packed in reels, as shown in Figure 4.
SL01305
TAPE DETAIL
COVER TAPE
CARRIER TAPE
REEL
ASSEMBLY
TAPE
GUARD
BAND
BARCODE
LABEL
BOX
Figure 4. Tape and reel packing method
Philips Semiconductors
Product data
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
2003 Oct 13
7
Plastic small outline package; 7 leads; body width 4.4 mm
SOP002
Philips Semiconductors
Product data
SA57026
300 mA LDO with ON/OFF control and
independent delayed RESET function
2003 Oct 13
8
REVISION HISTORY
Rev
Date
Description
_2
20031013
Product data (9397 750 12113). ECN 853-2292 30327 of 09 September 2003.
Modifications:
Change package name from SOP-7B to SOP002 in Ordering information and Package outline sections.
_1
20011003
Product data (9397 750 08968). ECN 853-2292 27197 of 03 October 2001.
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
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Koninklijke Philips Electronics N.V. 2003
All rights reserved. Printed in U.S.A.
Date of release: 10-03
Document order number:
9397 750 12113
Philips
Semiconductors
Data sheet status
[1]
Objective data
Preliminary data
Product data
Product
status
[2] [3]
Development
Qualification
Production
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).
Data sheet status
[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.
Level
I
II
III
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