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PDF ADP5302 Data sheet ( Hoja de datos )
| Número de pieza | ADP5302 | |
| Descripción | Ultralow Power Step-Down Regulator | |
| Fabricantes | Analog Devices | |
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Data Sheet
50 mA/500 mA, Ultralow Power Step-Down
Regulator With Battery Voltage Monitor
ADP5302
FEATURES
Input supply voltage range: 2.15 V to 6.50 V
Operates down to 2.00 V
Ultralow 240 nA quiescent current with no load
Selectable output voltages of 1.2 V to 3.6 V, or 0.8 V to 5.0 V
±1.5% output accuracy over the full temperature range in
pulse-width modulation (PWM) mode
Selectable hysteresis mode or PWM operation mode
Output current
Up to 50 mA in hysteresis mode
Up to 500 mA in PWM mode
VINOK flag to monitor input battery voltage
Ultrafast stop switching control
100% duty cycle operation mode
2 MHz switching frequency with optional synchronization
input from 1.5 MHz to 2.5 MHz
Quick output discharge (QOD) option
UVLO, OCP, and TSD protection
10-lead, 3 mm × 3 mm LFCSP package
Junction temperature: −40°C to +125°C
APPLICATIONS
Energy (gas, water) metering
Portable and battery-powered equipment
Medical applications
Keep-alive power supplies
GENERAL DESCRIPTION
The ADP5302 is a high efficiency, ultralow quiescent current
step-down regulator that draws only 240 nA quiescent current
to regulate the output at no load.
The ADP5302 runs from an input voltage of 2.15 V to 6.50 V,
allowing the use of multiple alkaline or NiMH cells, Li-Ion cells,
or other power sources. The output voltage is selectable from 0.8 V
to 5.0 V by an external VID resistor and a factory fuse. The total
solution requires only four tiny external components.
The ADP5302 can operate between hysteresis mode and PWM
mode via the SYNC/MODE pin. In hysteresis mode, the regulator
achieves excellent efficiency at less than 1 mW and provides up to
50 mA of output current. In PWM mode, the regulator produces a
lower output ripple and supplies up to 500 mA of output current.
The flexible configuration capability during operation of the
device enables very efficient power management to meet both
long battery life and low system noise requirements.
TYPICAL APPLICATION CIRCUIT
VIN =
2.15V TO 6.50V
10µF
ON
OFF
PVIN
EN
ADP5302
(LFCSP-10)
SW
PGND
2.2µH
10µF
VOUT
PWM
HYS
STOP
SW
SYNC/
MODE
STOP
AGND
FB
VINOK
VID
EPAD
VID0: 1.2V VID8: 2.5V
VID1: 1.5V VID9: 2.6V
VID2: 1.8V VID10: 2.7V
VID3: 2.0V VID11: 2.8V
R0
VID4: 2.1V
VID5: 2.2V
VID12: 2.9V
VID13: 3.0V
VID6: 2.3V VID14: 3.3V
VID7: 2.4V VID15: 3.6V
Figure 1.
The ADP5302 integrates an ultralow power comparator with a
factory programmable voltage reference to monitor the input
battery voltage. The regulator runs at a 2 MHz switching
frequency in PWM mode, and the SYNC/MODE pin can be
synchronized to an external clock from 1.5 MHz to 2.5 MHz.
The ADP5302 includes an extra STOP pin that can temporarily
disable the regulator switching; in this way, a quiet system environ-
ment can be achieved to benefit the noise sensitive circuitry, which
includes data conversion, RF data transmission, and analog sensors.
Other key features in the ADP5302 include separate enabling,
QOD, and safety features, such as overcurrent protection
(OCP), thermal shutdown (TSD), and input undervoltage
lockout (UVLO).
The ADP5302 is available in a 10-lead, 3 mm × 3 mm LFCSP
package rated for the −40°C to +125°C junction temperature range.
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2015–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADP5302
Data Sheet
SPECIFICATIONS
VIN = 3.6 V, VOUT = 2.5 V, TJ = −40°C to +125°C for minimum and maximum specifications, and TA = 25°C for typical specifications,
unless otherwise noted.
Table 1.
Parameter
INPUT SUPPLY VOLTAGE RANGE
SHUTDOWN CURRENT
QUIESCENT CURRENT
Operating Quiescent Current in
Hysteresis Mode
Symbol
VIN
ISHUTDOWN
IQ_HYS
Min Typ Max
2.15 6.50
18 40
18 130
240 360
240 520
640 1500
Unit
V
nA
nA
nA
nA
nA
Operating Quiescent Current in
Hysteresis Mode
Operating Quiescent Current in PWM Mode
UNDERVOLTAGE LOCKOUT
UVLO Threshold
Rising
Falling
OSCILLATOR CIRCUIT
Switching Frequency in PWM Mode
Feedback (FB) Threshold of Frequency Fold
SYNCHRONIZATION THRESHOLD1
SYNC Clock Range
SYNC High Level Threshold
SYNC Low Level Threshold
SYNC Duty Cycle Range
IQ_HYS2
IQ_PWM
UVLO
VUVLO_RISING
VUVLO_FALLING
fSW
VOSC_FOLD
SYNCCLOCK
SYNCHIGH
SYNCLOW
SYNCDUTY
1.90
1.7
1.5
1.2
100
SYNC/MODE Leakage Current
MODE TRANSITION
Transition Delay from Hysteresis Mode to
PWM Mode
EN PIN
Input Voltage Threshold
High
Low
Input Leakage Current
STOP SWITCHING
PWM Switching Stop Delay
PWM Switching Resume Delay
FB PIN
Output Options by VID Resistor
PWM Mode
Fixed VID Code Voltage Accuracy
ISYNC_LEAKAGE
tHYS_TO_PWM
VIH
VIL
IEN_LEAKAGE
1.2
tSTOP_RISE_DELAY
tSTOP_FALL_DELAY
VOUT_OPT
0.8
VFB_PWM_FIX
−0.6
2.4 3.2
425 630
2.06 2.14
2.00
2.0 2.3
0.3
2.5
0.4
1/fSW −
150
50 150
20
0.4
25
10
20
5.0
+0.6
μA
μA
V
V
MHz
V
MHz
V
V
ns
nA
Clock
cycles
V
V
nA
ns
ns
V
%
Adjustable VID Code Voltage Accuracy
VFB_PWM_ADJ
−1.2
−1.5
+1.2 %
+1.5 %
Test Conditions/Comments
VEN = 0 V, −40°C ≤ TJ ≤ +85°C
VEN = 0 V, −40°C ≤ TJ ≤ +125°C
−40°C ≤ TJ ≤ +85°C
−40°C ≤ TJ ≤ +125°C
100% duty cycle operation, VIN = 3.0 V,
VOUT set to 3.3 V
STOP = high; VIN = 3.6 V, VSTOP = 3.6 V
VSYNC/MODE = 3.6 V
SYNC/MODE goes logic high from
logic low
STOP goes logic high from logic low
STOP goes logic low from logic high
0.8 V to 5.0 V in various factory options
TJ = 25°C, output voltage setting via
factory fuse
−40°C ≤ TJ ≤ +125°C
Output voltage setting via the
VID resistor
Rev. A | Page 4 of 22
5 Page 
ADP5302
801
800
799
798
797
–40
25 85
TEMPERATURE (°C)
125
Figure 16. Feedback Voltage vs. Temperature, PWM Mode
800
–40ºC
700 +25ºC
+125ºC
600
500
400
300
200
2.3
2.9 3.5 4.1 4.7 5.3 5.9
VIN (V)
Figure 17. High-Side RDS(ON) H vs. VIN
6.5
1090
1040
990
940
890
840
–40
25
85 125
TEMPERATURE (°C)
Figure 18. Peak Current Limit vs. Temperature
Data Sheet
810
808
ACTIVE TO STANDBY
806
804
STANDBY TO ACTIVE
802
800
798
796
794
792
–40
25 85
TEMPERATURE (°C)
125
Figure 19. Feedback Voltage vs. Temperature, Hysteresis Mode
500
–40ºC
450 +25ºC
+125ºC
400
350
300
250
200
2.3
2.9 3.5 4.1 4.7 5.3
VIN (V)
Figure 20. Low-Side RDS(ON) L vs. VIN
5.9
6.5
1200
1150
1100
1050
1000
950
900
850
800
2.3
–40°C
+25°C
+125°C
2.9 3.5 4.1 4.7 5.3
VIN (V)
Figure 21. Peak Current Limit vs. VIN
5.9
6.5
Rev. A | Page 10 of 22
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ADP5302.PDF ] | |
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