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ADP1613 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADP1613
Beschreibung (ADP1612 / ADP1613) 650 KHz /1.3 MHz Step-Up PWM DC-to-DC Switching Converter
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 28 Seiten
ADP1613 Datasheet, Funktion
www.DataSheet4U.com
650 kHz /1.3 MHz Step-Up
PWM DC-to-DC Switching Converters
ADP1612/ADP1613
FEATURES
Current limit
1.4 A for the ADP1612
2.0 A for the ADP 1613
Minimum input voltage
1.8 V for the ADP1612
2.5 V for the ADP1613
Pin-selectable 650 kHz or 1.3 MHz PWM frequency
Adjustable output voltage up to 20 V
Adjustable soft start
Undervoltage lockout
Thermal shutdown
8-lead MSOP
APPLICATIONS
TFT LCD bias supplies
Portable applications
Industrial/instrumentation equipment
TYPICAL APPLICATION CIRCUIT
L1
ADP1612/
VIN ADP1613
6 VIN
SW 5
ON
OFF
3 EN
CIN 1.3MHz
650kHz
7 FREQ
(DEFAULT)
FB 2
8 SS
COMP 1
CSS
GND
4
D1 VOUT
R1
R2
RCOMP
CCOMP
COUT
Figure 1. Step-Up Regulator Configuration
GENERAL DESCRIPTION
The ADP1612/ADP1613 are step-up dc-to-dc switching con-
verters with an integrated power switch capable of providing
an output voltage as high as 20 V. With a package height of less
than 1.1 mm, the ADP1612/ADP1613 are optimal for space-
constrained applications such as portable devices or thin film
transistor (TFT) liquid crystal displays (LCDs).
The ADP1612/ADP1613 operate in current mode pulse-width
modulation (PWM) with up to 94% efficiency. Adjustable
soft start prevents inrush currents when the part is enabled.
The pin-selectable switching frequency and PWM current-mode
architecture allow for excellent transient response, easy noise
filtering, and the use of small, cost-saving external inductors
and capacitors. Other key features include undervoltage lockout
(UVLO), thermal shutdown (TSD), and logic controlled enable.
The ADP1612/ADP1613 are available in the lead-free
8-lead MSOP.
100
VIN = 5V
90
fSW = 1.3MHz
TA = 25°C
80
70
60
50
ADP1612, VOUT = 12V
40
ADP1612, VOUT = 15V
ADP1613, VOUT = 12V
ADP1613, VOUT = 15V
30
1 10 100 1k
LOAD CURRENT (mA)
Figure 2. ADP1612/ADP1613 Efficiency for Various Output Voltages
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
©2009 Analog Devices, Inc. All rights reserved.






ADP1613 Datasheet, Funktion
wwAwD.DPat1aS6he1e2t4/UA.coDmP1613
TYPICAL PERFORMANCE CHARACTERISTICS
VEN = VIN and TA = 25°C, unless otherwise noted.
100
VIN = 3.3V
90
fSW = 650kHz
TA = 25°C
80
ADP1612
70
60
50
40
VOUT = 5V
VOUT = 12V
VOUT = 15V
30
1 10 100 1k
LOAD CURRENT (mA)
Figure 4. ADP1612 Efficiency vs. Load Current, VIN = 3.3 V, fSW = 650 kHz
100
VIN = 3.3V
90
fSW = 1.3MHz
TA = 25°C
80
ADP1612
70
60
50
40
VOUT = 5V
VOUT = 12V
VOUT = 15V
30
1 10 100 1k
LOAD CURRENT (mA)
Figure 5. ADP1612 Efficiency vs. Load Current, VIN = 3.3 V, fSW = 1.3 MHz
100
VIN = 5V
90
fSW = 650kHz
TA = 25°C
80
ADP1612
70
60
50
40 VOUT = 12V
VOUT = 15V
30
1 10 100 1k
LOAD CURRENT (mA)
Figure 6. ADP1612 Efficiency vs. Load Current, VIN = 5 V, fSW = 650 kHz
100
VIN = 5V
90
fSW = 1.3MHz
TA = 25°C
80
ADP1612
70
60
50
40 VOUT = 12V
VOUT = 15V
30
1 10 100 1k
LOAD CURRENT (mA)
Figure 7. ADP1612 Efficiency vs. Load Current, VIN = 5 V, fSW = 1.3 MHz
100
VIN = 5V
90
fSW = 650kHz
TA = 25°C
80
ADP1613
70
60
50
40
VOUT = 12V
VOUT = 15V
VOUT = 20V
30
1 10 100 1k
LOAD CURRENT (mA)
Figure 8. ADP1613 Efficiency vs. Load Current, VIN = 5 V, fSW = 650 kHz
100
VIN = 5V
90
fSW = 1.3MHz
TA = 25°C
80
ADP1613
70
60
50
40
VOUT = 12V
VOUT = 15V
VOUT = 20V
30
1 10 100 1k
LOAD CURRENT (mA)
Figure 9. ADP1613 Efficiency vs. Load Current, VIN = 5 V, fSW = 1.3 MHz
Rev. 0 | Page 6 of 28

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ADP1613 pdf, datenblatt
wAwwD.DPa1ta6Sh1ee2t4/UA.cDomP1613
THERMAL SHUTDOWN (TSD)
The ADP1612/ADP1613 include TSD protection. If the die
temperature exceeds 150°C (typical), TSD turns off the NMOS
power device, significantly reducing power dissipation in the
device and preventing output voltage regulation. The NMOS
power device remains off until the die temperature reduces to
130°C (typical). The soft start capacitor is discharged during
TSD to ensure low output voltage overshoot and inrush
currents when regulation resumes.
UNDERVOLTAGE LOCKOUT (UVLO)
If the input voltage is below the UVLO threshold, the ADP1612/
ADP1613 automatically turn off the power switch and place
the part into a low power consumption mode. This prevents
potentially erratic operation at low input voltages and prevents
the power device from turning on when the control circuitry
cannot operate it. The UVLO levels have ~100 mV of hysteresis
to ensure glitch free startup.
ENABLE/SHUTDOWN CONTROL
The EN input turns the ADP1612/ADP1613 regulator on or
off. Drive EN low to turn off the regulator and reduce the
input current to 0.01 μA, typical. Drive EN high to turn on
the regulator.
When the step-up dc-to-dc switching converter is in shutdown
mode (EN ≤ 0.3 V), there is a dc path from the input to the output
through the inductor and output rectifier. This causes the output
voltage to remain slightly below the input voltage by the forward
voltage of the rectifier, preventing the output voltage from dropping
to ground when the regulator is shutdown. Figure 37 provides a
circuit modification to disconnect the output voltage from the
input voltage at shutdown.
Regardless of the state of the EN pin, when a voltage is applied to
VIN of the ADP1612/ADP1613, a large current spike occurs due
to the nonisolated path through the inductor and diode between
VIN and VOUT. The high current is a result of the output capacitor
charging. The peak value is dependent on the inductor, output
capacitor, and any load active on the output of the regulator.
Rev. 0 | Page 12 of 28

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