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ADP1147AN-33 fiches techniques PDF

Analog Devices - High Efficiency Step-Down Switching Regulator Controllers

Numéro de référence ADP1147AN-33
Description High Efficiency Step-Down Switching Regulator Controllers
Fabricant Analog Devices 
Logo Analog Devices 





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ADP1147AN-33 fiche technique
a
High Efficiency Step-Down
Switching Regulator Controllers
ADP1147-3.3/ADP1147-5
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.
VIN (5.2V TO 12V)
+
1F
+ CIN
100F
P-CHANNEL
IRF7204
L*
50H
D1
30BQ040
RSENSE**
0.05
VOUT
5V/2A
+ COUT
390F
0V = NORMAL
1.5V = SHUTDOWN
VIN
P-DRIVE
CC RC
3300pF 1k
ADP1147
SHUTDOWN
ITH SENSE(+)
CT SENSE(–)
CT GND
470pF
1000pF
*COILTRONICS CTX 50–2MP
**KRL SL-1-C1-0R050J
SHUTDOWN
Figure 1. High Efficiency Step-Down Converter
(Typical Application)
FUNCTIONAL BLOCK DIAGRAM
VIN P-DRIVE GROUND SENSE(+) SENSE(–)
ADP1147
SLEEP
S VTH2
VTH1
1
QR
S
T
2
R
QS
V
B
C 10mV to 150mV
13k
G
VOS
1.25V
5pF
100k
OFF-TIME VIN
CONTROL SENSE(–)
REFERENCE
CT ITH SHUTDOWN
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.
100
95 VIN = 6 VOLTS
90
VIN = 10 VOLTS
85
80
75
70
65
60
1 10 100 1k 10k
LOAD CURRENT – mA
Figure 2. ADP1147-5 Typical Efficiency, Figure 1 Circuit
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
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

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