ADP5020(RevA) Просмотр технического описания (PDF) - Analog Devices
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ADP5020 Datasheet PDF : 28 Pages
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Data Sheet
FEATURES
Input voltage range: 2.4 V to 5.5 V
Low standby current: 1 µA
Switching frequency: 3 MHz
I2C interface
Synchronous Buck 1 regulator: 600 mA
Synchronous Buck 2 regulator: 250 mA
Low dropout regulator (LDO): 150 mA
Internal compensation
Internal soft start
Thermal shutdown
20-lead 4 mm × 4 mm LFCSP
APPLICATIONS
Digital cameras, handsets
Mobile TVs
GENERAL DESCRIPTION
The ADP5020 provides a highly integrated power solution that
includes all of the power circuits necessary for a digital imaging
module. It comprises two step-down dc-to-dc converters, one
LDO, and a power sequence controller. All dc-to-dc converters
integrate power pMOSFETs and nMOSFETs, making the system
simpler and more compact and reducing the cost. The ADP5020
has digitally programmed output voltages and buck converters
that can source up to 600 mA. A fixed frequency operation of
3 MHz enables the use of tiny inductors and capacitors. The buck
converters use a voltage mode, constant-frequency PWM control
scheme, and the synchronous rectification is implemented to
reduce the power loss. The Buck 1 regulator operates at up to
93% efficiency.
Power Management Unit
for Imaging Modules
ADP5020
TYPICAL APPLICATIONS CIRCUIT
VIN
2.4V TO 5.5V
VDD1
SW1
10µF
2.2µH
1µF
VDD_IO
1.7V TO 3.6V
10kΩ 10kΩ
0.1µF
VDD2
VOUT1
VOUT1
VDD3
PGND1
ADP5020
VDDA
SW2
VOUT2
VDD_IO
PGND2
SDA
SCL
XSHTDN
EN/GPIO
VOUT3
SYNC
VOUT1
2.5V TO 3.7V
10µF
VOUT2
2.2µH 1.1V TO 1.8V
4.7µF
VOUT3
1.8V TO 3.3V
1µF
EXT. FREQ
9.6/19.2MHz
DGND AGND
Figure 1.
The ADP5020 provides high performance, reduces component
count and size, and is lower in cost when compared to conven-
tional designs.
The ADP5020 runs on input voltage from 2.4 V to 5.5 V and
supports one-cell lithium-ion (Li+) batteries. The high perfor-
mance LDO maximizes noise suppression. The ADP5020 can be
activated via an I2C® interface or through a dedicated enable input.
During logic-controlled shutdown, the input is disconnected
from the output source, and the part draws 1 µA typical from
the input source. Other key features include undervoltage lockout
to prevent deep-battery discharge and soft start to prevent input
current overshoot at startup. The ADP5020 is available in a
20-lead LFCSP.
Rev. A
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