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PDF ADP1606 Data sheet ( Hoja de datos )
| Número de pieza | ADP1606 | |
| Descripción | 2MHz Synchronous Boost DC-to-DC Converter | |
| Fabricantes | ANALOG DEVICES | |
| Logotipo |  |
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Data Sheet
FEATURES
Up to 96% efficiency
0.8 V to VOUT input voltage range
Low 0.9 V input start-up voltage
1.8 V fixed output voltage (ADP1606)
1.8 V to 3.3 V adjustable output voltage range (ADP1607)
23 µA quiescent current
Fixed pulse-width modulation (PWM) and light load pulse
frequency modulation (PFM) mode options
Synchronous rectification
True shutdown output isolation
Internal soft start, compensation, and current limit
2 mm × 2 mm, 6-lead LFCSP
Compact solution size
APPLICATIONS
1-cell and 2-cell alkaline and NiMH/NiCd powered devices
Portable audio players, instruments, and medical devices
Solar cell applications
Miniature hard disk power supplies
Power LED status indicators
GENERAL DESCRIPTION
The ADP1606/ADP1607 are high efficiency, synchronous, fixed
frequency, step-up dc-to-dc switching converters with a 1.8 V
fixed output voltage option and a 1.8 V to 3.3 V adjustable
output voltage option for use in portable applications.
The 2 MHz operating frequency enables the use of small
footprint, low profile external components. Additionally, the
synchronous rectification, internal compensation, internal fixed
2 MHz, Synchronous Boost
DC-to-DC Converters
ADP1606/ADP1607
TYPICAL APPLICATION CIRCUITS
L
2.2µH
INPUT VOLTAGE
0.8V TO VOUT
CIN
10µF
ADP1606
1 VIN
SW 5
VOUT 6
FIXED
OUTPUT VOLTAGE
1.8V
ON
OFF 2 EN
PWM
GND MODE 3 AUTO
COUT
10µF
4
Figure 1. ADP1606
L
2.2µH
INPUT VOLTAGE
0.8V TO VOUT
1
CIN
10µF
ON
OFF
2
ADP1607
VIN SW 5
VOUT 6
EN GND
4
FB 3
ADJUSTABLE
OUTPUT VOLTAGE
1.8V TO 3.3V
R1
COUT
R2 10µF
Figure 2. ADP1607
current limit, and current mode architecture allow excellent
transient response and a minimal external part count.
Other key features include fixed PWM and light load PFM
mode options, true output isolation, thermal shutdown (TSD),
and logic controlled enable. Available in a lead-free, thin, 6-lead
LFCSP package, the ADP1606/ADP1607 are ideal for providing
efficient power conversion in portable devices.
Rev. D
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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 ©2012–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
Data Sheet
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
ADP1606/ADP1607
VIN 1
6 VOUT
EN 2
MODE 3
ADP1606
TOP VIEW
(Not to Scale)
7
EPAD
5 SW
4 GND
NOTES
1. CONNECT THE EXPOSED PAD TO GND.
Figure 3. ADP1606 Pin Configuration
VIN 1
6 VOUT
EN 2
FB 3
ADP1607
TOP VIEW
(Not to Scale)
7
EPAD
5 SW
4 GND
NOTES
1. CONNECT THE EXPOSED PAD TO GND.
Figure 4. ADP1607 Pin Configuration
Table 4. ADP1606 Pin Function Descriptions
Pin No. Mnemonic Description
1 VIN
Analog and Power Supply Pin.
2 EN
Shutdown Control Pin. Drive EN high to turn on the synchronous boost; drive EN low to turn it off.
3
MODE
Mode Select Pin. This pin toggles between auto mode (automatic transitioning between PFM and PWM mode)
and fixed PWM mode. Set MODE low to allow the device to operate in auto mode. Pull MODE high to force the
device to operate in PWM mode. The voltage applied to MODE cannot be higher than the voltage applied to VIN.
Do not leave this pin floating.
4 GND Analog and Power Ground Pin.
5 SW
Drain Connection for NMOS and PMOS Power Switches.
6
VOUT
Output Voltage and Source Connection of PMOS Power Switch.
7
EPAD
Exposed Pad. Connect to GND.
Table 5. ADP1607 Pin Function Descriptions
Pin No. Mnemonic Description
1 VIN
Analog and Power Supply Pin.
2 EN
Shutdown Control Pin. Drive EN high to turn on the synchronous boost; drive EN low to turn it off.
3 FB
Output Voltage Feedback Pin.
4 GND Analog and Power Ground Pin.
5 SW
Drain Connection for NMOS and PMOS Power Switches.
6
VOUT
Output Voltage and Source Connection of PMOS Power Switch.
7
EPAD
Exposed Pad. Connect to GND.
Rev. D | Page 5 of 16
5 Page 
Data Sheet
This current-mode PWM regulation system allows fast
transient response and tight output voltage regulation. PWM
mode operation results in lower efficiencies than PFM mode at
light loads.
Auto Mode
Auto mode is a power saving feature that forces the auto mode
version of the ADP1607 and the auto mode of the ADP1606 to
switch between PFM and PWM in response to output load
changes. In auto mode, the ADP1606/ADP1607 operate in PFM
mode for light load currents and switch to PWM mode for
medium and heavy load currents.
PFM Mode
When the auto mode version of the ADP1607 and the auto
mode of the ADP1606 are operating under light load
conditions, the effective switching frequency and supply current
are decreased and varied using PFM to regulate the output
voltage. This results in improved efficiencies and lower
quiescent currents. In PFM mode, the converter only switches
when necessary to keep the output voltage between the PFM
comparator high output voltage threshold and the lower sleep
mode exit voltage threshold. Switching stops when the upper
PFM limit is reached and resumes when the lower sleep mode
exit threshold is reached.
When VOUT exceeds the upper PFM threshold, switching stops
and the device enters sleep mode. In sleep mode, the
ADP1606/ADP1607 are mostly shut down, significantly
reducing the quiescent current. The output voltage is
discharged by the load until the output voltage reaches the
lower sleep mode exit threshold. After crossing the lower sleep
mode exit threshold, switching resumes and the process repeats.
Mode Transition
The auto mode version of the ADP1607 and the auto mode of
the ADP1606 switch automatically between PFM and PWM
modes to maintain optimal efficiency. Switching to PFM allows
the converter to save power by supplying the lighter load
current with fewer switching cycles. The mode transition point
depends on the operating conditions. See Figure 16 for typical
transition levels for VOUT = 2.5 V. Hysteresis exists in the
transition point to prevent instability and decreased efficiencies
that may result if the converter oscillates between PFM and
PWM for a fixed input voltage and load current.
ADP1606/ADP1607
The output voltage in PWM can be greater than or less than the
PFM voltage of that device.
INTERNAL CONTROL FEATURES
Input to Output Isolation
While in shutdown, the ADP1606/ADP1607 manage the
voltage of the bulk of the PMOS to force it off and internally
isolate the path from the input to output. This isolation allows
the output to drop to ground, reducing the current
consumption of the application in shutdown.
Soft Start
The ADP1606/ADP1607 soft start sequence is designed for
optimal control of the device. When EN goes high, or when the
device recovers from a TSD, the start-up sequence begins. The
output voltage increases through a sequence of stages to ensure
that the internal circuitry is powered up in the correct order as
the output voltage rises to its final value.
Current Limit
The ADP1606/ADP1607 are designed with a fixed 1 A typical
current limit that does not vary with duty cycle.
Synchronous Rectification
In addition to the N-channel MOSFET switch, the
ADP1606/ADP1607 have a P-channel MOSFET switch to build
the synchronous rectifier. The synchronous rectifier improves
efficiency, especially for heavy load currents, and reduces cost
and board space by eliminating the need for an external
Schottky diode.
Compensation
The PWM control loop of the ADP1606/ADP1607 is internally
compensated to deliver maximum performance with no
additional external components. The ADP1606/ADP1607 are
designed to work with 2.2 μH chip inductors and 10 μF ceramic
capacitors. Other values may reduce performance and/or
stability.
TSD Protection
The ADP1606/ADP1607 include TSD protection when the
device is in PWM mode only. If the die temperature exceeds
150°C (typical), the TSD protection activates and turns off the
power devices. They remain off until the die temperature falls
below 135°C (typical), at which point the converter restarts.
Rev. D | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADP1606.PDF ] | |
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