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ADP1147AN-33 Datasheet(PDF) 1 Page - Analog Devices

No. de pieza ADP1147AN-33
Descripción Electrónicos  High Efficiency Step-Down Switching Regulator Controllers
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ADP1147AN-33 Datasheet(HTML) 1 Page - Analog Devices

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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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
a
ADP1147-3.3/ADP1147-5
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
High Efficiency Step-Down
Switching Regulator Controllers
FUNCTIONAL BLOCK DIAGRAM
Q
R
S
VIN
SENSE(–)
VTH2
SLEEP
VOS
1.25V
OFF-TIME
CONTROL
5pF
100k
13k
VIN P-DRIVE GROUND
SENSE(+) SENSE(–)
CT
ITH SHUTDOWN
ADP1147
10mV to 150mV
R
S
Q
1
2
C
V
G
S
T
B
VTH1
REFERENCE
FEATURES
Greater Than 95% Efficiency
Current Mode Switching Architecture Provides
Superior Load and Line Transient Response
Wide Input Voltage Range 3.5 V* to 16 V
User Defined Current Limit
Short Circuit Protection
Shutdown Pin
Low Dropout Voltage
Low Standby Current 160
A typ
Low Cost
Available in 8-Lead PDIP or 8-Lead SOIC
APPLICATIONS
Portable Computers
Modems
Cellular Telephones
Portable Equipment
GPS Systems
Handheld Instruments
GENERAL DESCRIPTION
The ADP1147 is part of a family of High Efficiency Step-Down
Switching Regulators. These regulators offer superior load and
line transient response, a user defined current limit and an
automatic power savings mode. The automatic power savings
mode is used to maintain efficiency at lower output currents.
The ADP1147 incorporates a constant off-time, current mode
switching architecture to drive an external P-channel MOSFET
at frequencies up to 250 kHz. Constant off-time switching gen-
erates a constant ripple current in the external inductor. This
results in a wider input voltage operating range of 3.5 V* to
16 V, and a less complex circuit design.
*3.5 volt operation is for the ADP1147-3.3.
1000pF
SHUTDOWN
L
*
50 H
D1
30BQ040
1 F
0V = NORMAL
1.5V = SHUTDOWN
RSENSE**
0.05
RC
1k
CC
3300pF
CT
470pF
VIN (5.2V TO 12V)
CIN
100 F
VOUT
5V/2A
COUT
390 F
P-CHANNEL
IRF7204
SHUTDOWN
GND
P-DRIVE
SENSE(–)
ADP1147
ITH
CT
VIN
SENSE(+)
+
+
+
*COILTRONICS CTX 50–2MP
**KRL SL-1-C1-0R050J
Figure 1. High Efficiency Step-Down Converter
(Typical Application)
A very low dropout voltage with excellent output regulation can
be obtained by minimizing the dc resistance of the Inductor, the
RSENSE resistor, and the RDS(ON) of the P-MOSFET. The power
savings mode conserves power by reducing switching losses at
lower output currents. When the output load current falls below
the minimum required for the continuous mode the ADP1147
will automatically switch to the power savings mode. It will remain
in this mode until the inductor requires additional current or the
sleep mode is entered. In sleep mode with no load the standby
power consumption of the device is reduced to 2.0 mW typical
at VIN = 10 V.
For designs requiring even greater efficiencies refer to the
ADP1148 data sheet.
LOAD CURRENT – mA
100
95
60
1
10k
10
100
1k
90
85
65
80
75
70
VIN = 6 VOLTS
VIN = 10 VOLTS
Figure 2. ADP1147-5 Typical Efficiency, Figure 1 Circuit


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