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PDF ADP5024 Data sheet ( Hoja de datos )
| Número de pieza | ADP5024 | |
| Descripción | Regulators | |
| Fabricantes | Analog Devices | |
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Data Sheet
FEATURES
Main input voltage range: 2.3 V to 5.5 V
Two 1200 mA buck regulators and one 300 mA LDO
24-lead, 4 mm × 4 mm LFCSP package
Regulator accuracy: ±3%
Factory programmable or external adjustable VOUTx
3 MHz buck operation with forced PWM and automatic
PWM/PSM modes
BUCK1/BUCK2: output voltage range from 0.8 V to 3.8 V
LDO: output voltage range from 0.8 V to 5.2 V
LDO: input supply voltage from 1.7 V to 5.5 V
LDO: high PSRR and low output noise
APPLICATIONS
Power for processors, ASICS, FPGAs, and RF chipsets
Portable instrumentation and medical devices
Space constrained devices
Dual 3 MHz, 1200 mA Buck
Regulators with One 300 mA LDO
ADP5024
GENERAL DESCRIPTION
The ADP5024 combines two high performance buck regula-
tors and one low dropout (LDO) regulator in a small, 24-lead,
4 mm × 4 mm LFCSP to meet demanding performance and
board space requirements.
The high switching frequency of the buck regulators enables tiny
multilayer external components and minimizes the board space.
When the MODE pin is set high, the buck regulators operate in
forced PWM mode. When the MODE pin is set low, the buck
regulators operate in PWM mode when the load current is above
a predefined threshold. When the load current falls below a pre-
defined threshold, the regulator operates in power save mode
(PSM), improving the light load efficiency.
The two bucks operate out of phase to reduce the input capacitor
requirement. The low quiescent current, low dropout voltage, and
wide input voltage range of the LDO extends the battery life of
portable devices. The ADP5024 LDO maintains power supply
rejection greater than 60 dB for frequencies as high as 10 kHz
while operating with a low headroom voltage.
Regulators in the ADP5024 are activated though dedicated
enable pins. The default output voltages can be either externally
http://www.DataSheet4U.net/ set in the adjustable version or factory programmable to a wide
range of preset values in the fixed voltage version.
2.3V TO
5.5V
1.7V TO
5.5V
CAVIN
0.1µF
C1
4.7µF
ON
OFF
C2
4.7µF
ON
OFF
C3
1µF
TYPICAL APPLICATION CIRCUIT
AVIN
VIN1
EN1
VIN2
EN2
HOUSEKEEPING
BUCK1
EN1 MODE
MODE
BUCK2
EN2
VOUT1
SW1
FB1
PGND1
MODE
VOUT2
SW2
FB2
PGND2
L1 1µH
R1
R2
VOUT1 AT
1200mA
C5
10µF
PWM
PSM/PWM
L2 1µH
R3
R4
VOUT2 AT
1200mA
C6
10µF
EN3
VIN3
EN3 LDO
(ANALOG)
ADP5024
AGND
VOUT3
FB3
R5
R6
VOUT3 AT
300mA
C7
1µF
Figure 1.
Rev. A
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
www.analog.com
Fax: 781.461.3113 ©2011-2012 Analog Devices, Inc. All rights reserved.
datasheet pdf - http://www.DataSheet4U.net/
1 page  
Data Sheet
ADP5024
LDO SPECIFICATIONS
VIN3 = (VOUT3 + 0.5 V) or 1.7 V (whichever is greater) to 5.5 V; CIN = COUT = 1 µF; TJ = −40°C to +125°C for minimum/maximum
specifications, and TA = 25°C for typical specifications, unless otherwise noted.1
Table 3.
Parameter
INPUT VOLTAGE RANGE
OPERATING SUPPLY CURRENT
Bias Current per LDO2
Symbol
VIN3
IVIN3BIAS
Total System Input Current IIN
LDO Only
OUTPUT CHARACTERISTICS
Output Voltage Accuracy
Line Regulation
Load Regulation3
VOLTAGE FEEDBACK
DROPOUT VOLTAGE4
ΔVOUT3/VOUT3
(ΔVOUT3/VOUT3)/ΔVIN3
(ΔVOUT3/VOUT3)/ΔIOUT3
VFB3
VDROPOUT
CURRENT-LIMIT THRESHOLD5
ACTIVE PULL-DOWN
OUTPUT NOISE
Regulator LDO
POWER SUPPLY REJECTION
RATIO
Regulator LDO
ILIMIT3
RPDWN-L
NOISELDO
PSRR
Test Conditions/Comments
Min
1.7
IOUT3 = 0 µA
IOUT3 = 10 mA
IOUT3 = 300 mA
Includes all current into AVIN, VIN1,
VIN2, and VIN3
IOUT3 = 0 µA, all other channels
disabled
100 µA < IOUT3 < 300 mA
IOUT3 = 1 mA
IOUT3 = 1 mA to 300 mA
VOUT3 = 5.2 V, IOUT3 = 300 mA
VOUT3 = 3.3 V, IOUT3 = 300 mA
VOUT3 = 2.5 V, IOUT3 = 300 mA
VOUT3 = 1.8 V, IOUT3 = 300 mA
Channel disabled
−3
−0.03
0.485
335
10 Hz to 100 kHz, V = 5 V, V = 2.8 Vhttp://www.DataSheet4U.net/
IN3
OUT3
10 kHz, VIN3 = 3.3 V, VOUT3 = 2.8 V,
IOUT3 = 1 mA
100 kHz, VIN3 = 3.3 V, VOUT3 = 2.8 V,
IOUT3 = 1 mA
1 MHz, VIN3 = 3.3 V, VOUT3 = 2.8 V,
IOUT3 = 1 mA
Typ
10
60
165
53
0.001
0.5
50
75
100
180
600
600
100
60
62
63
Max
5.5
30
100
245
+3
+0.03
0.003
0.515
140
Unit
V
µA
µA
µA
µA
%
%/V
%/mA
V
mV
mV
mV
mA
Ω
µV rms
dB
dB
dB
1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
2 This is the input current into VIN3, which is not delivered to the output load.
3 Based on an endpoint calculation using 1 mA and 300 mA loads.
4 Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only to output voltages
above 1.7 V.
5 Current-limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, the current limit for a 3.0 V
output voltage is defined as the current that causes the output voltage to drop to 90% of 3.0 V or 2.7 V.
Rev. A | Page 5 of 28
datasheet pdf - http://www.DataSheet4U.net/
5 Page 
Data Sheet
100
+25°C
90
80
–40°C
70
+85°C
60
50
40
30
20
10
0
0.001
0.01
0.1
1
IOUT (A)
Figure 15. BUCK1 Efficiency vs. Load Current, Across Temperature,
VIN = 3.9 V, VOUT1 = 3.3 V, Automatic Mode
100
90 +25°C
+85°C
80
70
–40°C
60
50
40
30
20
10
0
0.001
0.01
0.1
1
IOUT (A)
Figure 16. BUCK2 Efficiency vs. Load Current, Across Temperature,
VOUT2 = 1.8 V, Automatic Mode
100
+25°C
90
80
70 +85°C
–40°C
60
50
40
30
20
10
0
0.001
0.01
0.1
1
IOUT (A)
Figure 17. BUCK1 Efficiency vs. Load Current, Across Temperature,
VOUT1 = 0.8 V, Automatic Mode
ADP5024
3.3
3.2
+25°C
3.1
–40°C
3.0
+85°C
2.9
2.8
2.7
2.6
2.5
0
0.2 0.4 0.6 0.8 1.0 1.2
IOUT (A)
Figure 18. BUCK2 Switching Frequency vs. Output Current, Across
Temperature, VOUT2 = 1.8 V, PWM Mode
T
VOUT
1
ISW
2
SW
http://www.DataSheet4U.net/
4
CH1 50mV
CH2 500mA Ω
CH4 2.00V
M 4.00µs A CH2
T 28.40%
240mA
Figure 19. Typical Waveforms, VOUT1 = 3.3 V, IOUT1 = 30 mA, Automatic Mode
T
VOUT
1
ISW
2
SW
4
CH1 50mV BW CH2 500mA Ω M 4.00µs A CH2
CH4 2.00V BW
T 28.40%
220mA
Figure 20. Typical Waveforms, VOUT2 = 1.8 V, IOUT2 = 30 mA, Automatic Mode
Rev. A | Page 11 of 28
datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
| Páginas | Total 28 Páginas | |
| PDF Descargar | [ Datasheet ADP5024.PDF ] | |
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