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ADP1148AN-33 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADP1148AN-33
Beschreibung High Efficiency Synchronous Step-Down Switching Regulators
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADP1148AN-33 Datasheet, Funktion
a
High Efficiency Synchronous
Step-Down Switching Regulators
ADP1148, ADP1148-3.3, ADP1148-5
FEATURES
Operation From 3.5 V to 18 V Input Voltage
Ultrahigh Efficiency > 95%
Low Shutdown Current
Current Mode Operation for Excellent Line and Load
Transient Response
High Efficiency Maintained Over Wide Current Range
Logic Controlled Micropower Shutdown
Short Circuit Protection
Very Low Dropout Operation
Synchronous FET Switching for High Efficiency
Adaptive Nonoverlap Gate Drives
APPLICATIONS
Notebook and Palmtop Computers
Portable Instruments
Battery Operated Digital Devices
Industrial Power Distribution
Avionics Systems
Telecom Power Supplies
GPS Systems
Cellular Telephones
GENERAL DESCRIPTION
The ADP1148 is part of a family of synchronous step-down
switching regulator controllers featuring automatic sleep mode
to maintain high efficiencies at low output currents. These
devices drive external complementary power MOSFETs at
switching frequencies up to 250 kHz using a constant off-time
current-mode architecture.
FUNCTIONAL BLOCK DIAGRAM
ADP1148
ADJUSTABLE
PWR SIGNAL
VERSION
VIN P-DRIVE N-DRIVE GND GND SENSE(+) VFB SENSE(–)
31
14 12 11
89
7
SLEEP
S
VTH2
4
CT
NON-OVERLAP
DRIVE
1
QR
VTH1
S
T
2
R
QS
C
10mV to
150mV
OFF-TIME
CONTROL
VIN
SENSE(–)
VFB
6
ITH
V
B
13k
G
1.25V 100k
REFERENCE
10
SHUTDOWN
5
INT VCC
The constant off-time architecture maintains constant ripple
current in the inductor, easing the design of wide input range
converters. Current-mode operation provides excellent line and
load transient response. The operating current level is user
programmable via an external current sense resistor.
The ADP1148 incorporates automatic Power Saving Sleep
Mode operation when load currents drop below the level re-
quired for continuous operation. In sleep mode, standby power
is reduced to only about 2 mW at VIN = 10 V. In shutdown,
both MOSFETs are turned off.
+
1F
VIN (5.2V TO 18V)
10nF
VIN
INT VCC
P-DRIVE
0V = NORMAL
>1.5V = SHUTDOWN
ADP1148
SHUTDOWN
ITH SENSE(+)
RC
1k
CC
3300pF
CT SENSE(–)
CT N-DRIVE
470pF
S-GND P-GND
TYPICAL APPLICATIONS
CIN +
100F
P-CH
IRF7204
L* RSENSE**
62H 0.05
VOUT
5V/2A
1000pF
N-CH
IRF7403
C1
10BQ040
+ COUT
390F
*COILTRONICS CTX-68-4
**KRL SL-1-C1-0R050L
100
VIN = 6V
95
VIN = 10V
90
85
80
75
FIGURE 1 CIRCUIT
70
0.02
0.2
LOAD CURRENT – A
2
Figure 1. High Efficiency Step-Down Converter
Figure 2. ADP1148-5 Typical Efficiency
REV. A
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., 1997






ADP1148AN-33 Datasheet, Funktion
ADP1148, ADP1148-3.3, ADP1148-5–Typical Performance Characteristics
1.8
1.6 0؇C
1.4
1.2 25؇C
70؇C
1.0
0.8
0.6
0.4
0.2
0.0
1 2 4 6 8 10 12
(VIN–VOUT) – V
Figure 12. Operating Frequency vs.
(VIN–VOUT)
30
25
20
Qn+Qp = 100nC
15
10
Qn+Qp = 50nC
5
0
20 50 80 110 140 170 200 230 260
OPERATING FREQUENCY – kHz
Figure 13. Gate Charge Supply
Current
80
70
60
50
40
30
20
3.3V
10
5V
0
0.3 0.5 1.0 1.5 2.0 2.5 3.0 3.3 3.5 4.0 4.5 5.0
OUTPUT VOLTAGE – V
Figure 14. Off Time vs. VOUT
155
150
145
MAXIMUM THRESHOLD
140
135
130
125
120
0
25 70 85
TEMPERATURE – ؇C
100
Figure 15. Current Sense Threshold
Voltage
–6– REV. A

6 Page









ADP1148AN-33 pdf, datenblatt
ADP1148, ADP1148-3.3, ADP1148-5
VIN
4V TO 18V
IRF7204
D1
10BQ040
CIN
100F
20V
IRF7403
1F
CT
300pF
10nF
CC
3300pF
RC
1k
1
P-DRIVE
14
N-DRIVE
2 13
NC NC
3 ADP1148-3.3 12
VIN POWER GND
*L
50H
4
CT
11
SIGNAL GND
5
INT VCC
10
SHUTDOWN
6
ITH
7
SENSE(–)
9
VFB
8
SENSE(+)
1000pF
**RSENSE
0.1
NC = NO CONNECT
*COILTRONICS CTX50-2-MP
**KRL SP-1/2-A1-0R100J
COUT
220F
10V ؋ 2
AVX
VOUT
3.3V/1A
Figure 19. ADP1148 Low Dropout, 3.3 V/1 A High Efficiency Regulator
VIN
4V TO 9V
IRF7204
D1
10BQ015
CIN
220F
20V
IRF7403
CT
560pF
1F
10nF
CC
6800pF
RC
1k
1
P-DRIVE
14
N-DRIVE
2
NC
ADP1148
13
NC
3
VIN
12
POWER GND
4
CT
11
SIGNAL GND
5
INT VCC
10
SHUTDOWN
6
ITH
7
SENSE(–)
9
VFB
8
SENSE(+)
*L
50H
200pF
1000pF
**RSENSE
0.05
25k
1%
75k
1%
VOUT
–5V/1.4A
COUT
220F ؋ 2
10V
NC = NO CONNECT
*COILTRONICS CTX50-2-MP
**KRL SL-1-C1-0R05J
Figure 20. 4 V to 9 V Input Voltage to –5 V/1.4 A Regulator
–12–
REV. A

12 Page





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