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ADP1611 PDF даташит

Спецификация ADP1611 изготовлена ​​​​«Analog Devices» и имеет функцию, называемую «1.2 MHz Step-Up DC-to-DC Switching Converter».

Детали детали

Номер произв ADP1611
Описание 1.2 MHz Step-Up DC-to-DC Switching Converter
Производители Analog Devices
логотип Analog Devices логотип 

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ADP1611 Даташит, Описание, Даташиты
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FEATURES
Fully integrated 1.2 A , 0.23 Ω power switch
Pin-selectable 700 kHz or 1.2 MHz PWM frequency
90% efficiency
Adjustable output voltage up to 20 V
3% output regulation accuracy
Adjustable soft start
Input undervoltage lockout
MSOP 8-lead package
APPLICATIONS
TFT LC bias supplies
Portable applications
Industrial/instrumentation equipment
20 V,1.2 MHz Step-Up
DC-to-DC Switching Converter
ADP1611
GENERAL DESCRIPTION
The ADP1611 is a step-up dc-to-dc switching converter with an
integrated 1.2 A, 0.23 Ω power switch capable of providing an
output voltage as high as 20 V. With a package height of less
than 1.1 mm, the ADP1611 is optimal for space-constrained
applications such as portable devices or thin film transistor
(TFT) liquid crystal displays (LCDs).
The ADP1611 operates in pulse-width modulation (PWM)
current mode with up to 90% efficiency. Adjustable soft start
prevents inrush currents at startup. The pin-selectable switching
frequency and PWM current-mode architecture allow excellent
transient response, easy noise filtering, and the use of small,
cost-saving external inductors and capacitors.
The ADP1611 is offered in the Pb-free 8-lead MSOP and
operates over the temperature range of −40°C to +85°C.
FB 2
RT 7
FUNCTIONAL BLOCK DIAGRAM
REF
COMP
1
ERROR
AMP
gm
IN
6
BIAS
ADP1611
RAMP
GEN
OSC
F/F
RQ
S
COMPARATOR
DRIVER
5 SW
SS 8
SD 3
SOFT START
CURRENT-
SENSE
AMPLIFIER
4
GND
Figure 1.
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. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703 © 2005 Analog Devices, Inc. All rights reserved.









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ADP1611 Даташит, Описание, Даташиты
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ADP1611
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 10
Current-Mode PWM Operation .............................................. 10
Frequency Selection ................................................................... 10
Soft Start ...................................................................................... 10
On/Off Control........................................................................... 10
Setting the Output Voltage ........................................................ 10
REVISION HISTORY
2/05—Revision 0: Initial Version
Choosing the Input and Output Capacitors ........................... 11
Diode Selection........................................................................... 12
Loop Compensation .................................................................. 12
Soft-Start Capacitor ................................................................... 13
Application Circuits ................................................................... 14
Step-Up DC-to-DC Converter with True Shutdown ............ 14
TFT LCD Bias Supply ................................................................ 14
SEPIC Power Supply .................................................................. 15
Layout Procedure ........................................................................... 16
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Rev. 0 | Page 2 of 20









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ADP1611 Даташит, Описание, Даташиты
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ADP1611
SPECIFICATIONS
VIN = 3.3 V, TA = −40°C to +85°C, unless otherwise noted. All limits at temperature extremes are guaranteed by correlation and
characterization using standard statistical quality control (SQC), unless otherwise noted.
Table 1.
Parameter
SUPPLY
Input Voltage
Quiescent Current
Nonswitching State
Shutdown
Switching State1
OUTPUT
Output Voltage
Load Regulation
Overall Regulation
REFERENCE
Feedback Voltage
Line Regulation
ERROR AMPLIFIER
Transconductance
Voltage Gain
FB Input Bias Current
SWITCH
SW On Resistance
SW Leakage Current
Peak Current Limit2
OSCILLATOR
Oscillator Frequency
Maximum Duty Cycle
SHUTDOWN
Shutdown Input Voltage Low
Shutdown Input Voltage High
Shutdown Input Bias Current
SOFT START
SS Charging Current
UNDERVOLTAGE LOCKOUT3
UVLO Threshold
UVLO Hysteresis
Symbol Conditions
VIN
IQ VFB = 1.3 V, RT = VIN
IQSD VSD = 0 V
IQSW fSW = 1.23 MHz, no load
VOUT
VFB
gm
AV
RON
ICLSET
fOSC
DMAX
VIL
VIH
ISD
ILOAD = 10 mA to 150 mA, VOUT = 10 V
Line, load, temperature
VIN = 2.5 V to 5.5 V
I = 1 µA
VFB = 1.23 V
ISW = 1.0 A
VSW = 20 V
RT = GND
RT = IN
COMP = open, VFB = 1 V, RT = GND
VSD = 3.3 V
VSS = 0 V
VIN rising
1 This parameter specifies the average current while switching internally and with SW (Pin 5) floating.
2 Guaranteed by design and not fully production tested.
3 Guaranteed by characterization.
Min Typ Max Unit
2.5 5.5 V
390 600
0.01 10
12
µA
µA
mA
VIN 20
0.05
±3
V
mV/mA
%
1.212 1.230 1.248
−0.15
+0.15
V
%/V
100 µA/V
60 dB
10 nA
230 600
0.01 20
2.0
mΩ
µA
A
0.49 0.7
0.885 MHz
0.89 1.23 1.6
MHz
78 83 90
%
0.6
2.2
0.01 1
V
V
µA
3
2.2 2.4 2.5
220
µA
V
mV
Rev. 0 | Page 3 of 20










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