MAX1792-25DP [NXP]
IC,VOLT REGULATOR,FIXED/ADJUSTABLE,+2.5/1.25 TO +5V,CMOS,TSSOP,8PIN,PLASTIC;
| 型号： | MAX1792-25DP |
| 厂家： | 
NXP |
| 描述： | IC,VOLT REGULATOR,FIXED/ADJUSTABLE,+2.5/1.25 TO +5V,CMOS,TSSOP,8PIN,PLASTIC |
| 文件： | 总12页 (文件大小：164K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
INTEGRATED CIRCUITS
MAX1792-XX
500 mA, low-noise,
preset/adjustable LDO regulator
with thermal protection
Objective data
2003 Apr 07
Philips
Semiconductors
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
GENERAL DESCRIPTION
MAX1792-XX very low-dropout linear regulator operates from +2.5 V
to 6.5 V supply and delivers a guaranteed 500 mA output load
current at 110 mV (typical) dropout voltage. It needs 1 µF
input/output capacitors, offers a low output noise voltage of
85 µVrms. The output voltage accuracy is extremely high ±1% of
preset mode or can be adjusted from 1.25 V to 5.0 V with an
external resistive divider. To accommodate high density layouts it is
packaged in the small footprint 8-leaded HTSSOP-8 package with
an exposed pad for better power dissipation, an ideal for all portable
applications such as cellular phones, cordless phones, and
notebook computers.
HTSSOP-8 (TOP)
HTSSOP-8 (BOTTOM)
Additional features include power and thermal shutdown, output
current limitation, power status and thermal warning via the RST pin,
reverse battery protection, external logic-controlled on-off via the
SHDN pin.
FEATURES
• Preset output voltages of 1.5 V, 1.8 V, 3.3 V, or 5.0 V
• Output voltage adjustable between 1.25 to 5.0 V
• Low 85 µV
noise without noise bypass capacitor.
rms
• ±1% typical output voltage accuracy
• 500 mA Maximum Output Current with current limitation.
• Typical dropout voltage 110 mV @ 500 mA output current
• 110 µA typical ground current
APPLICATIONS
• Notebook computers
• Cellular and Cordless Phones
• USB Hubs
• Thermal-overload and short-circuit protection
• Reverse battery protection
• Docking Stations
• RST pin - both power status and thermal warning indicator.
• SHDN pin offers logic-controlled shutdown
• Max line regulation 0.15%/V
• Personal Digital Assitants (PDA)
• Base Stations
• Palmtop Computers
• Max load regulation 1%
• Other battery-powered equipment
SIMPLIFIED SYSTEM DIAGRAM
V
V
IN
V
IN
OUT
1 µF
1 µF
R
Load
Preset output or
adjustable from
1.25 V to 5.0 V
DC
MAX1792-XX
2.5 V to 6.5 V
R
RST
100 KΩ
ON
RST
to µC
SHDN
SET
OFF
SL02063
GND
Figure 1. Simplified system diagram.
2
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
ORDERING INFORMATION
PACKAGE
TEMPERATURE
RANGE
TYPE NUMBER
NAME
DESCRIPTION
VERSION
SOT770-1
plastic thermal enhanced thin shrink small outline package;
8 leads; body width 3 mm; exposed die pad
MAX1792-XXDP
HTSSOP8
–40 to +85 °C
NOTE:
The device has five voltage output options, indicated by the XX on
the “Type number”.
XX
15
18
25
33
50
OUTPUT VOLTAGE (Typical)
1.5 V or adj.
1.8 V or adj.
2.5 V or adj.
3.3 V or adj.
5.0 V or adj.
PIN CONFIGURATION
PIN DESCRIPTION
PIN
SYMBOL
DESCRIPTION
1, 2 IN
Regulator input. Supply voltage can range
from +2.5 V to 6.5 V. Minimum input voltage
required is 2.5 V. Bypass with a 1 µF
capacitor to GND. Connect both input pins
together externally.
IN
IN
1
2
3
4
8
7
6
5
OUT
OUT
SET
GND
MAX1792-XX
RST
SHDN
3
4
RST
Connect a 10 kΩ up to 100 kΩ resistor
between RST and OUT. Active LOW
open-drain output indicates an
out-of-regulation condition when power falls
typically 6% below VOUT(NOM), or thermal
warning (trips at 127 °C ± 2 °C). If not used,
leave this pin unconnected.
SL02064
Figure 2. Pin configuration.
SHDN
Shutdown input.
Active HIGH. A logic LOW powers down the
regulator. The shutdown quiescent current is
typically 50nA. Connect to IN for manual
operation.
5
6
GND
SET
Ground. This pin and the exposed pad also
function as a heatsink. Solder both to a large
pad or to the circuit-board ground plane to
maximize power dissipation.
Voltage-Setting Input. If connected to GND,
VOUT is preset.
If connected to a resistive divider between
OUT and GND to set output volatage
between 1.25 V and 5.0 V.
7, 8 OUT
Regulator output.
Sources up to 500 mA. Bypass with a 1 µF
capacitor to GND. Connect both output pins
together externally.
3
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
MAXIMUM RATINGS (SOT23-5)
SYMBOL
PARAMETER
MIN.
–0.3
–0.3
–0.3
–40
–
MAX.
+6.5
+6.5
UNIT
V
V
V
V
V
to GND voltage
IN
IN
RST to GND voltage
OUT to GND voltage
V
RST
OUT
V
+ 0.3
V
IN
T
Operating temperature range
Junction temperature
+85
°C
°C
°C
mW
amb
T
j
+125
+160
TBD
T
stg
Storage temperature
–65
–
P
Power dissipation (T
= 25 °C)
amb
Power dissipation degrading factor above 25 °C = 5.1 mW/°C
R
Thermal resistance, junction to ambient
–
TBD
°C/W
th(j-a)
4
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
ELECTRICAL CHARACTERISTICS
V
= V
+0.5 V, or V = 2.5 V (whichever is greater), SHDN = V , T
= 0 °C to +85 °C, unless otherwise noted. Typical values are at
IN
OUT(nom)
IN
IN amb
T
amb
= 25 °C. (Note1)
Symbol
Parameter
Conditions
Min
2.5
–1
Typ
Max
6.5
+1
Units
V
IN
Input voltage (Preset Mode)
V
V
OUT
Output Voltage Accuracy
(Preset Mode)
I
= 100 mA,
Preset V
Preset V
≥ 2.5 V
OUT
T
amb
OUT
= +85 °C
< 2.5 V
–1.5
–2
+1.5
+2
OUT
%
I
= 100 mA, T
= 0 °C to +85 °C
OUT
amb
I
= 1 mA to 500 mA, V > V + 0.5 V,
OUT
–3
+3
OUT
IN
T
amb
= 0 °C to +85 °C
Adjustable Output Voltage Range
1.25
5
V
V
V
I
SET Voltage Threshold
(Adjustable Mode)
V
V
= 2.7 V,
T = 85 °C
amb
1.229
1.25
1.271
SET
IN
set to
OUT
2.0 V
= 100 mA
T
= 0 °C to 85 °C
1.219
1.281
1.8
amb
I
OUT
Maximum Output Current
Short-Circuit Current Limit
In-Regulation Current Limit
SET input Bias Current
Ground Pin Current
V
≥ 2.7 V
500
mA
A
OUT
IN
I
V
OUT
= 0 V, V ≥ 2.7 V
0.55
0.8
1.6
LIM
IN
V
> 96% of nominal value, V ≥ 2.7 V
IN
A
OUT
I
V
SET
I
OUT
= 1.25 V
= 1 mA
–100
–
+100
250
nA
SET
I
Q
80
µA
I
= 500 mA
V
OUT
110
110
120
200
OUT
V
IN
-
Dropout Voltage (Note 3)
Line Regulation
I
= 500 mA
= 5.0 V
= 3.3 V
= 2.5 V
175
200
310
OUT
V
OUT
V
OUT
V
OUT
mV
V
from (V
+ 100 mV) to 5.5 V,
= 5 mA
IN
OUT
I
∆V
∆V
–0.15
–
0
+0.15
1.0
%/V
%
LOAD
LNR
Load Regulation
I
= 1 mA to 500 mA
0.4
LDR
OUT
Output Voltage Noise
10 Hz to 1 MHz, C
= 3.3 µF
OUT
(ESR < 0.1 W)
–
85
–
µVRMS
Shutdown
I
SHDN Supply Current
SHDN input Threshold
1
–
SHDN = GND, VIN = 5.5 V
2.5 V < VIN < 5.5 V
2.5 V < VIN < 5.5 V
SHDN = IN or GND
µA
V
OFF
V
1.6
–
IH
V
0.6
100
IL
I
SHDN input Bias Current
10
nA
SHDN
RESET Output (Power & Temperature Warning)
V
OL
RST Output Low Voltage
RST sinking 1 mA
0.01
0.1
5.5
V
V
Operating Voltage Range for Valid
Reset
RST sinking 100 mA
1.0
RST Output High Leakage Current
RST Trip Temperature
V
= +5.5 V
100
–
nA
°C
°C
%
RST
–
–
127
12
RST Trip Temperature Hysteresis
RST Threshold
–
Rising edge, referred to V
90
–
93
3
96
OUT(NOMINAL)
RST Threshod Hysteresis
RST Release Delay
%
t
Rising edge of OUT to rising edge of RST
1.5
4.5
8
–
ms
RP
Thermal Protection
TSHDN
Thermal Shutdown Temperature
SHDN = V or GND
–
154
13
°C
°C
IN
∆TSHDN Thermal Shutdown Hysteresis
SHDN = GND, V = 5.5 V
IN
5
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
ELECTRICAL CHARACTERISTICS
V
= V
+0.5 V, or V = 2.5 V (whichever is greater), SHDN = V , T
= –40 °C to +85 °C, unless otherwise noted. (Note2)
IN
OUT(nom)
IN
IN amb
Symbol
Parameter
Conditions
Min
2.5
Typ
Max
6.5
+2
Units
V
IN
Input voltage (Preset Mode)
V
V
OUT
Output Voltage Accuracy
(Preset Mode)
I
= 100 mA
–2
OUT
%
I
= 1 mA to 500 mA
–3
+3
OUT
Adjustable Output Voltage Range
1.25
1.212
5
V
V
V
SET
SET Voltage Threshold
(Adjustable Mode)
I
= 100 mA
1.288
OUT
IOUT
Maximum Output Current
Short–Circuit Current Limit
SET Input Bias Current
Ground Pin Current
500
0.55
–100
–
–
mA
A
I
V
= 0 V, V 2.7 V
1.8
LIM
OUT
IN
I
V
= 1.25 V
+100
250
175
200
310
nA
mA
SET
SET
I
Q
I
= 1 mA
OUT
V
IN
–
Dropout Voltage (Note 3)
I
= 500 mA
V
OUT
V
OUT
V
OUT
= 5.0 V
–
OUT
V
OUT
= 3.3 V
= 2.5 V
–
mV
–
Line Regulation
Load Regulation
V
IN
from (V
I
+ 100 mV) to 5.5 V,
= 5 mA
OUT
LOAD
∆VLNR
∆VLDR
–0.15
–
+0.15
1.0
%/V
%
I
= 1 mA to 500 mA
OUT
Shutdown
IOFF
SHDN Supply Current
SHDN input Threshold
1
–
SHDN = GND, VIN = 5.5 V
2.5 V < VIN < 5.5 V
–
1.6
–
mA
V
VIH
VIL
0.6
100
2.5 V < VIN < 5.5 V
ISHDN
SHDN input Bias Current
SHDN = V or GND
nA
–
IN
RESET Output (Power & Temperature OK)
V
OL
RST Output Low Voltage
RST sinking 1 mA
–
0.1
5.5
V
V
Operating Voltage Range for Valid
Reset
RST sinking 100 µA
1.0
RST Output High Leakage Current
RST Trip Temperature
V
= +5.5 V
100
–
–
–
–
nA
°C
°C
%
RST
127
12
RST Trip Temperature Hysteresis
RST Threshold
–
Rising edge, referred to V
90
–
96
–
OUT(NOMINAL)
RST Threshold Hysteresis
RST Release Delay
3
%
t
1.5
8
ms
RP
Thermal Protection
TSHDN
Thermal Shutdown Temperature
–
–
–
–
154
13
°C
°C
∆TSHDN Thermal Shutdown Hysteresis
NOTES:
1. Limits are production tested at T
= +25 °C.
amb
2. Specifications to –40 °C are guaranteed by design, not production tested.
3. The dropout voltage is defined as V –V , where V is 100 mV below the value of V
when V = V +0.5 V
OUT
IN
OUT
OUT
OUT
IN
Since the minimum input voltage is 2.5 V, this specificaiton is only meaningful when V
≥ 2.5 V. Characterization curves for dropout
OUT(NOM)
voltages over temperature range using V
= V –V
, where V
= 98%V
are also included.
DROPOUT
IN
OUT
OUT
OUT(nom)
6
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
TECHNICAL DESCRIPTION
Temperature Sensor
The temperature sensor block monitors the die temperature and
flags RST when the temperature crosses 127 °C. If the die
temperature goes beyond 144 °C typical value the output amplifier is
shut down. Both the temperatures corresponding to RST or SHDN
have a hysteresis of 13 °C.
General Discussion
The MAX1792-XX is a low drop-out, low-quiescent current linear
regulator designed primarily for battery-powered applications and
stabilizes with or without input/output capacitors. The device delivers
up to 500 mA and is available with preset output voltages of 1.5 V,
1.8 V, 2.5 V, 3.3 V, and 5.0 V for HTSSOP-8 package.
Reverse Battery Protection
The reverse battery protection circuit prevents damage to the device
if the supply battery is accidentally installed backwards. This circuit
compares IN and SHDN to GND and disconnects the device’s
internal circuits if it detects reversed polarity. Reverse supply current
is limited to 1 mA when this protective circuit is active, preventing
the battery from rapidly discharging through the device. Reverse
battery current is extremely low, 0.5 µA typical.
The 1.225 V band-gap reference is connected to the error amplifier’s
inverting input. The error amplifier compares this reference with the
feedback voltage and amplifies the difference. If the feedback
voltage is lower than the reference voltage, the pass-transistor gate
is pulled lower, which allows more current to pass to the output. The
output voltage is fed back through an internal resistor voltage divider
connected to the OUT pin.
RESET Output
Band-gap
RST goes low when the output voltage goes out of regulation as
during drop-out, current limit or thermal shutdown. RST is an
open-drain N-channel MOSFET. To obtain a logic-level output,
connect a 10 kΩ pull-up resistor from RST pin to OUT pin. To
minimize current consumption, make this resistor as large as
practical. A 100 kΩ resistor works well for most applications. The
RST is not active during shutdown. RST has a 10ms blanking time
to allow transient responses to settle within accuracy limits.
The band-gap circuitry generates a temperature independent
voltage by properly adding two voltages with negative and positive
temperature coefficient. The band-gap voltage is typically 1.25 V
with a temperature variation of 5 mV over the temperature range
from –40 °C to 85 °C.
Low Pass Filter
Low pass filter is basically an RC filter with a low cutoff frequency
and internally built in circuitry. Bypass capacitor needed at 1µF from
OUT to GND. There is one comparator, which turns on the bypass
paths to charge or discharge the capacitor if the output of the filter is
higher or lower than the band-gap voltage by a specified amount.
Current Limit
The MAX1792-XX includes a current limiter that monitors and
controls the pass transistor’s gate voltage, limiting the output current
to 1.8A typical value. For design purposes, consider the current limit
to be 550 mA minimum value. The output can be shorted to ground
for an indefinite period of time without damaging the part.
Output Amplifier
The output amplifier is a folded cascode PMOS amplifier which
controls the gate of the output transistor and sources the load
current. A portion of the output voltage is compared to the reference
voltage and a constant voltage is maintained at output. The output is
also monitored by a comparator which trips the RST if the output
voltage falls below the nominal output level by a specified amount
due to low battery condition or any other reason. The current limiter
circuit monitors the output current and limits the load current to a
certain value to avoid any damage due to short circuit.
SET Output (Adjustable Output)
The MAX1792-XX can be operated in either a preset voltage mode
or an adjustable mode. Connect SET to GND to select the preset
output voltage. The output voltage may also be adjusted by
connecting a resistive network divider from OUT to SET to GND
(Figure 4, Typical Application Using Adjustable Mode). Select R2 in
the 25 kΩ to 100 km range. Calculate R1 with the following
equation:
Bias Circuit
R1 + R2[(VOUTńVSET) * 1]
The bias block provides bias currents and voltages for the other
blocks. It has a self start-up circuit and it can establish the bias
currents and voltages very fast.
where V
= 1.25 V and V
may range from 1.25 V to 5.0 V.
OUT
SET
7
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
SIMPLIFIED BLOCK DIAGRAM
REVERSE
BATTERY
PROTECTION
GND
5
TEMP.
SENSOR
LOGIC
CONTROL
6
SET
LOW
PASS
BAND GAP
FILTER
1
2
OUTPUT
AMP
IN
SHDN
OUT
4
ADJ.
COMPARATOR
7
8
BIAS
NETWORK
3
RST
MAX1792-XX
SL02065
Figure 3. Simplified block diagram.
8
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
SYSTEM TEST USING RESISTIVE DIVIDER NETWORK
V
IN
1 µF
1 µF
Preset output or
adjustable from
1.25 V to 5.0 V
DC
V
V
OUT
IN
R
Load
2.5 V to 6.5 V
MAX1792-XX
R
RST
100 KΩ
ON
RST
SET
SHDN
GND
R1
R2
OFF
SL02066
Figure 4. Typical application using adjustable mode.
9
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
PACKING METHOD
The MAX1792-XX is packed in reels, as shown in Figure 5.
GUARD
BAND
TAPE
TAPE DETAIL
REEL
ASSEMBLY
COVER TAPE
CARRIER TAPE
BARCODE
LABEL
BOX
SL01305
Figure 5. Tape and reel packing method.
10
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
HTSSOP8: plastic thermal enhanced thin shrink small outline package; 8 leads;
body width 3 mm; exposed die pad
SOT770-1
11
2003 Apr 07
Philips Semiconductors
Objective data
500 mA, low-noise, preset/adjustable LDO
regulator with thermal protection
MAX1792-XX
REVISION HISTORY
Rev
Date
Description
_1
20030407
Objective data; initial version (9397 750 11171).
Data sheet status
Product
status
Definitions
[1]
Level
Data sheet status
[2] [3]
I
Objective data
Development
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.
II
Preliminary data
Qualification
Production
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.
III
Product data
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).
[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.
Limitingvaluesdefinition— 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
viaaCustomerProduct/ProcessChangeNotification(CPCN).PhilipsSemiconductorsassumesnoresponsibilityorliabilityfortheuseofanyoftheseproducts,conveys
nolicenseortitleunderanypatent, copyright, ormaskworkrighttotheseproducts, andmakesnorepresentationsorwarrantiesthattheseproductsarefreefrompatent,
copyright, or mask work right infringement, unless otherwise specified.
Koninklijke Philips Electronics N.V. 2003
Contact information
All rights reserved. Printed in U.S.A.
For additional information please visit
http://www.semiconductors.philips.com.
Fax: +31 40 27 24825
Date of release: 04-03
9397 750 11171
For sales offices addresses send e-mail to:
sales.addresses@www.semiconductors.philips.com.
Document order number:
Philips
Semiconductors
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