|
ADP5302 の電気的特性と機能
|
ADP5302のメーカーはAnalog Devicesです、この部品の機能は「Ultralow Power Step-Down Regulator」です。 |
|
|
製品の詳細 ( Datasheet PDF )
| 部品番号 ADP5302 |
| 部品説明 Ultralow Power Step-Down Regulator |
| メーカ Analog Devices |
ロゴ |
このページの下部にプレビューとADP5302ダウンロード（pdfファイル）リンクがあります。 Total 23 pages |
No Preview Available ! |
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
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Application Circuit ............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Detailed Functional Block Diagram .............................................. 3
Specifications..................................................................................... 4
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 14
Buck Regulator Operational Modes......................................... 14
Oscillator and Synchronization ................................................ 14
Adjustable and Fixed Output Voltages .................................... 14
Undervoltage Lockout (UVLO) ............................................... 15
Enable/Disable ............................................................................ 15
Current Limit .............................................................................. 15
REVISION HISTORY
6/2016—Rev. 0 to Rev. A
Changes to Features Section and General Description Section....... 1
Change to SYNC Clock Range Parameter, Table 1 ...................... 4
Change to Table 4 ............................................................................. 7
Change to Oscillator and Synchronization Section ................... 14
9/2015—Revision 0: Initial Version
Data Sheet
Short-Circuit Protection............................................................ 15
Soft Start ...................................................................................... 15
Startup with Precharged Output .............................................. 15
100% Duty Operation................................................................ 15
Active Discharge......................................................................... 15
VINOK Function........................................................................ 15
STOP Switching.......................................................................... 16
Thermal Shutdown .................................................................... 16
Applications Information .............................................................. 17
External Component Selection ................................................ 17
Selecting the Inductor................................................................ 17
Output Capacitor........................................................................ 17
Input Capacitor........................................................................... 18
Efficiency..................................................................................... 18
Printed Circuit Board Layout Recommendations ................. 19
Typical Application Circuits ......................................................... 20
Factory Programmable Options ................................................... 21
Outline Dimensions ....................................................................... 22
Ordering Guide .......................................................................... 22
Rev. A | Page 2 of 22
3Pages
Data Sheet
Parameter
Hysteresis Mode
Fixed VID Code Threshold Accuracy from
Active Mode to Standby Mode
Symbol
VFB_HYS_FIX
Adjustable VID Code Threshold Accuracy
from Active Mode to Standby Mode
Hysteresis of Threshold Accuracy from
Active Mode to Standby Mode
Feedback Bias Current
VFB_HYS_ADJ
VFB_HYS (HYS)
IFB
SW PIN
High-Side Power FET On Resistance
Low-Side Power FET On Resistance
Current-Limit in PWM Mode
Peak Current in Hysteresis Mode
Minimum On Time
VINOK PIN
VINOK Monitor Threshold Range
VINOK Monitor Accuracy
RDS (ON) H
RDS (ON) L
ILIM_PWM
ILIM_HYS
tMIN_ON
VVINOK (RISE)
VINOK Monitor Threshold Hysteresis
VINOK Rising Delay
VINOK Falling Delay
Leakage Current for VINOK Pin
Output Low Voltage for VINOK Pin
SOFT START
Default Soft Start Time
Start-Up Delay
VVINOK (HYS)
tVINOK_RISE
tVINOK_FALL
IVINOK_LEAKAGE
VVINOK_LOW
tSS
tSTART_DELAY
Min Typ Max
−0.75
−2.5
−3
1
66
25
+0.75
+2.5
+3
95
45
386 520
299 470
800 1000 1200
265
40 70
2.05 5.15
−1.5 +1.5
−3 +3
1.5
190
130
0.1 1
50 100
350
2
COUT DISCHARGE SWITCH ON RESISTANCE
THERMAL SHUTDOWN
Threshold
Hysteresis
RDIS
TSHDN
THYS
290
142
127
1 SYNC refers to the synchronization function of the multifunction SYNC/MODE pin only.
Unit
%
%
%
%
nA
nA
mΩ
mΩ
mA
mA
ns
V
%
%
%
μs
μs
μA
mV
μs
ms
Ω
°C
°C
ADP5302
Test Conditions/Comments
TJ = 25°C
−40°C ≤ TJ ≤ +125°C
−40°C ≤ TJ ≤ +125°C
Output Option 0, VOUT = 2.5 V
Output Option 1, VOUT = 1.3 V
Pin to pin measurement
Pin to pin measurement
SYNC/MODE = high
SYNC/MODE = low
Factory programmable
TJ = 25°C
−40°C ≤ TJ ≤ +125°C
IVINOK = 100 μA
Factory trim, 1 bit (350 μs, 2800 μs)
Delay from the EN pin being pulled
high
Rev. A | Page 5 of 22
6 Page
合計 : 23 ページ |
| PDF ダウンロード [ ADP5302 データシート.PDF ] |
|
データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
|
|
| 部品番号 | 部品説明 | メーカ |
| ADP5300 | Ultralow Power Step-Down Regulator | Analog Devices |
| ADP5301 | Ultralow Power Step-Down Regulator | Analog Devices |
| ADP5302 | Ultralow Power Step-Down Regulator | Analog Devices |
| ADP5303 | Ultralow Power Step-Down Regulator | Analog Devices |