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PDF ADP5041 Data sheet ( Hoja de datos )
| Número de pieza | ADP5041 | |
| Descripción | Micro PMU | |
| Fabricantes | Analog Devices | |
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Data Sheet
Micro PMU with 1.2 A Buck, Two 300 mA LDOs,
Supervisory, Watchdog, and Manual Reset
ADP5041
FEATURES
Input voltage range: 2.3 V to 5.5 V
One 1.2 A buck regulator
Two 300 mA LDOs
20-lead, 4 mm × 4 mm LFCSP package
Overcurrent and thermal protection
Soft start
Undervoltage lockout
Open-drain processor reset with externally adjustable
threshold monitoring
Guaranteed reset output valid to VAVIN = 1 V
Manual reset input
Watchdog refresh input
Buck key specifications
Output voltage range: 0.8 V to 3.8 V
Current mode topology for excellent transient response
3 MHz operating frequency
Peak efficiency up to 96%
Uses tiny multilayer inductors and capacitors
Mode pin selects forced PWM or auto PWM/PSM mode
100% duty cycle low dropout mode
LDOs key specifications
Output voltage range: 0.8 V to 5.2 V
Low input supply voltage from 1.7 V to 5.5 V
Stable with 2.2 μF ceramic output capacitors
High PSRR
Low output noise
Low dropout voltage
−40°C to +125°C junction temperature range
GENERAL DESCRIPTION
The ADP5041 combines one high performance buck regulator
and two low dropout regulators (LDO) in a small 20-lead
LFCSP to meet demanding performance and board space
requirements.
The high switching frequency of the buck regulator enables
use of tiny multilayer external components and minimizes
board space.
When the MODE pin is set to logic high, the buck regulator
operates in forced PWM mode. When the MODE pin is set to
logic low, the buck regulator operates in PWM mode when the
load is around the nominal value. When the load current falls
below a predefined threshold, the regulator operates in power
save mode (PSM), improving the light load efficiency. The low
quiescent current, low dropout voltage, and wide input voltage
FUNCTIONAL BLOCK DIAGRAM
RFILT = 30Ω
AVIN
VIN1
=
2.3V TO
5.5V
VIN2 = 1.7V
TO 5.5V
C1
4.7µF
ON
OFF
VBIAS
VIN1
BUCK
EN_BK
EN1
C2
1µF
ON
OFF
VIN2
EN2
MR
LDO1
(DIGITAL)
EN_LDO1
VBIAS
SUPERVISOR
ON
OFF
EN3
VIN3 = 1.7V
TO 5.5V
VIN3
C3
1µF
EN_LDO2
LDO2
(ANALOG)
AGND
VOUT1
SW
FB1
R2
PGND
L1
1µH
R1
VOUT1 AT
1.2A
C6
10µF
MODE
VOUT2
FB2
R4
FPWM
PSM/PWM
R3
C5
2.2µF
VOUT2 AT
300mA
nRSTO
WDI
VTHR
R4
µP
R5
VOUT3
FB3
R3
R7
VOUT3 AT
300mA
C6
2.2µF
Figure 1.
range of the ADP5041 LDOs extend the battery life of portable
devices. The ADP5041 LDOs maintain a power supply rejection
greater than 60 dB for frequencies as high as 10 kHz while
operating with a low headroom voltage.
Each regulator in the ADP5041 is activated by a high level on
the respective enable pin. The output voltages of the regulators
and the reset threshold are programmed through external resistor
dividers to address a variety of applications. The ADP5041
contains supervisory circuits that monitor power supply voltage
levels and code execution integrity in microprocessor-based
systems. They also provide power-on reset signals. An on-chip
watchdog timer can reset the microprocessor if it fails to strobe
within a preset timeout period.
Rev. 0
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 Analog Devices, Inc. All rights reserved.
1 page  
ADP5041
Data Sheet
Parameter
WATCHDOG INPUT
Watchdog Timeout Period
Option 0
Option 1
WDI Pulse Width
WDI Input Threshold
WDI Input Current (Source)
WDI Input Current (Sink)
MANUAL RESET INPUT
MR Input Pulse Width
MR Glitch Rejection
MR Pull-Up Resistance
MR to Reset Delay
Min Typ Max Unit Test Conditions/Comments
81.6
102 122.4
ms
1.28 1.6 1.92 sec
80 ns VIL = 0.4 V, VIH = 1.2 V
0.4 1.2 V
8
15 20
µA VWDI = VCC, time average
−30 −25 −15 µA VWDI = 0 V, time average
1 µs
220 ns
25 52 90 kΩ
280 Ns VCC = 5 V
BUCK SPECIFICATIONS
AVIN, VIN1 = 2.3 V to 5.5 V; VOUT1 = 1.8 V; L = 1 µH; CIN = 10 µF; COUT = 10 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 CHARACTERISTICS
Input Voltage Range
OUTPUT CHARACTERISTICS
Output Voltage Accuracy
Line Regulation
Load Regulation
VOLTAGE FEEDBACK
PWM TO POWER SAVE MODE
CURRENT THRESHOLD
INPUT CURRENT CHARACTERISTICS
DC Operating Current
Shutdown Current
SW CHARACTERISTICS
SW On Resistance
Current Limit
ACTIVE PULL-DOWN
OSCILLATOR FREQUENCY
Symbol
VIN1
VOUT1
(ΔVOUT1/VOUT1)/ΔVIN1
(ΔVOUT1/VOUT1)/ΔIOUT1
VFB1
IPSM_L
INOLOAD
ISHTD
RPFET
RNFET
ILIMIT
fOSC
Test Conditions/Comments
Min
2.3
PWM mode, ILOAD = 0 mA to 1200 mA
PWM mode
ILOAD = 0 mA to 1200 mA, PWM mode
−3
0.485
MODE = ground
ILOAD = 0 mA, device not switching,
all other channels disabled
EN1 = 0 V, TA = TJ = −40°C to +125°C
PFET, AVIN = VIN1 = 3.6 V
PFET, AVIN = VIN1 = 5 V
NFET, AVIN = VIN1 = 3.6 V
NFET, AVIN = VIN1 = 5 V
PFET switch peak current limit
EN1 = 0 V
1600
2.5
Typ Max
5.5
−0.05
−0.1
0.5
100
+3
0.515
21 35
0.2 1.0
180
140
170
150
1950
85
3.0
240
190
235
210
2300
3.5
1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
Unit
V
%
%/V
%/A
V
mA
μA
μA
mΩ
mΩ
mΩ
mΩ
mA
Ω
MHz
Rev. 0 | Page 4 of 40
5 Page 
ADP5041
3.90
3.88
3.86
3.84
3.82
3.80
3.78
3.76
3.74
3.72
3.70
0.01
0.1
–40°C
+25°C
+85°C
1
OUTPUT CURRENT (A)
Figure 9. Buck Load Regulation Across Temperature, VOUT1 = 3.8 V,
Auto Mode
3.39
–40°C
+25°C
3.37 +85°C
3.35
3.33
3.31
3.29
3.27
3.25
0.01
0.1
1
OUTPUT CURRENT (A)
Figure 10. Buck Load Regulation Across Temperature, VOUT1 = 3.3 V,
Auto Mode
1.820
1.815
1.810
–40°C
+25°C
+85°C
1.805
1.800
1.795
1.790
1.785
1.780
0.01
0.1
1
OUTPUT CURRENT (A)
Figure 11. Buck Load Regulation Across Temperature, VOUT1 = 1.8 V,
Auto Mode
Data Sheet
1.24
1.23
–40°C
+25°C
+85°C
1.22
1.21
1.20
1.19
1.18
0.01
0.1
1
OUTPUT CURRENT (A)
Figure 12. Buck Load Regulation Across Temperature, VOUT1 = 1.2 V,
Auto Mode
3.90
3.88
3.86
–40°C
+25°C
+85°C
3.84
3.82
3.80
3.78
3.76
3.74
3.72
3.70
0.01
0.1
1
OUTPUT CURRENT (A)
Figure 13. Buck Load Regulation Across Temperature, VOUT1 = 3.8 V,
PWM Mode
3.32
3.31
–40°C
+25°C
+85°C
3.30
3.29
3.28
3.27
3.26
3.25
0.01
0.1
1
OUTPUT CURRENT (A)
Figure 14. Buck Load Regulation Across Temperature, VOUT1 = 3.3 V,
PWM Mode
Rev. 0 | Page 10 of 40
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADP5041.PDF ] | |
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