ADP1147AR-5 Analog Devices, ADP1147AR-5 Datasheet

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ADP1147AR-5

Manufacturer Part Number
ADP1147AR-5
Description
ADP1147AR-5High Efficiency Step-Down Switching Regulator Controllers
Manufacturer
Analog Devices
Datasheet
1.ADP1147AR-5.pdf (12 pages)
a
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.
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.
0V = NORMAL
FEATURES
Greater Than 95% Efficiency
Current Mode Switching Architecture Provides
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
1.5V = SHUTDOWN
Figure 1. High Efficiency Step-Down Converter
(Typical Application)
+
3300pF
Superior Load and Line Transient Response
1 F
C
C
V
IN
1k
R
C
470pF
(5.2V TO 12V)
C
T
+
C
100 F
I
C
IN
SHUTDOWN
TH
T
ADP1147
SHUTDOWN
GND
V
SENSE(–)
P-DRIVE
SENSE(+)
IN
P-CHANNEL
IRF7204
*COILTRONICS CTX 50–2MP
**KRL SL-1-C1-0R050J
1000pF
D1
30BQ040
50 H
L
*
R
SENSE
0.05
**
+
C
390 F
OUT
V
5V/2A
OUT
Switching Regulator Controllers
A very low dropout voltage with excellent output regulation can
be obtained by minimizing the dc resistance of the Inductor, the
R
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 V
For designs requiring even greater efficiencies refer to the
ADP1148 data sheet.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
SLEEP
SENSE
Figure 2. ADP1147-5 Typical Efficiency, Figure 1 Circuit
ADP1147
IN
= 10 V.
S
resistor, and the R
100
95
90
85
80
75
70
65
60
ADP1147-3.3/ADP1147-5
V
TH2
1
High Efficiency Step-Down
FUNCTIONAL BLOCK DIAGRAM
C
T
V
TH1
CONTROL
World Wide Web Site: http://www.analog.com
OFF-TIME
10
Q R
T
1
S
LOAD CURRENT – mA
DS(ON)
V
IN
V
V
IN
IN
P-DRIVE GROUND
V
SENSE(–)
= 10 VOLTS
IN
= 6 VOLTS
100
of the P-MOSFET. The power
C
Q
I
2
10mV to 150mV
TH
© Analog Devices, Inc., 1998
R
S
13k
SHUTDOWN
1k
V
B
SENSE(+) SENSE(–)
REFERENCE
G
V
1.25V
OS
10k
100k
5pF

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ADP1147AR-5 Summary of contents

Page 1

... Figure 1. High Efficiency Step-Down Converter (Typical Application) 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 ...

Page 2

... Extended Commercial Temperature Range . . – +85 C Junction Temperature +150 C Storage Temperature Range . . . . . . . . . . . . – +150 C Lead Temperature (Soldering, 10 sec +300 calculated from the ambient temperature according to the following formulas: ADP1147AN-3.3, ADP1147AN- 110 C/W). ADP1147AR-3.3, ADP1147AR- + ...

Page 3

ELECTRICAL CHARACTERISTICS Parameter REGULATED OUTPUT VOLTAGE ADP1147-3.3 ADP1147-5 INPUT DC SUPPLY CURRENT Normal Mode Sleep Mode (ADP1147-3.3) Sleep Mode (ADP1147-5) Shutdown CURRENT SENSE THRESHOLD VOLTAGE ADP1147-3.3 ADP1147-5 SHUTDOWN PIN THRESHOLD OFF-TIME NOTES 1 All limits at temperature extremes are guaranteed ...

Page 4

ADP1147-3.3/ADP1147-5 200 150 100 MAXIMUM OUTPUT CURRENT – Amps Figure 3. Selecting R vs. SENSE Maximum Output Current 100 GATE CHARGE 95 ADP1147 SCHOTTKY DIODE 85 ...

Page 5

V ) – Volts IN OUT Figure 12. Operating Frequency vs. (V – OUT 155 MAXIMUM ...

Page 6

ADP1147-3.3/ADP1147-5 (a) Continuous Mode Operation (b) Power Saving Mode Figure 19. C Waveforms T P-CHANNEL ADP1147-3 P-DRIVE IN 390pF C GROUND T 3300pF SHUTDOWN I SHUTDOWN TH SENSE(–) SENSE(+) 1k 1000pF ...

Page 7

APPLICATIONS The ADP1147 family of regulators incorporate a current mode, constant off-time architecture to switch an external P-channel MOSFET. The external MOSFET can be switched at frequen- cies up to 250 kHz. The switching frequency of the device is determined ...

Page 8

ADP1147-3.3/ADP1147-5 The formula used to calculate the continuous operating fre- quency is OUT OFF OFF the value of the desired output voltage. ...

Page 9

The Schottky diode is in conduction during the MOSFET off- time. A short circuit the most demanding situa- OUT tion on for the diode. During this time it must be capable of delivering I for ...

Page 10

ADP1147-3.3/ADP1147-5 Losses are encountered in all elements of the circuit, but the four major sources for the circuit shown in Figure 1 are: 1. The ADP1147 dc bias current. 2. The MOSFET gate charge current The I R ...

Page 11

To obtain optimum efficiency the required ESR value 100 m or less. The circuit should also be evaluated with the minimum input voltage. This is done to assure that the power dissipation and junction temperature of the ...

Page 12

ADP1147-3.3/ADP1147-5 0.210 (5.33) OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Plastic DIP (N-8) 0.430 (10.92) 0.348 (8.84 0.280 (7.11) 0.240 (6.10 0.325 (8.25) 0.300 (7.62) 0.060 (1.52) PIN 1 0.015 (0.38) MAX 0.130 (3.30) ...

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