High Efficiency Dual
Power Supply Controller
ADP3026
FEATURES
Wide input voltage range: 5.5 V to 25 V
High conversion efficiency > 96%
Integrated current sense—no external resistor required
Low shutdown current: 19 µA (typical)
Voltage mode PWM with input feed-forward for fast line
transient response
Dual synchronous buck controllers
Built-in gate drive boost circuit for driving external
N-channel MOSFETs
2 fixed output voltages: 3.3 V and 5 V
PWM frequency: 200 kHz
Extensive circuit protection functions
GENERAL DESCRIPTION
The ADP3026 is a highly efficient dual synchronous buck
switching regulator controller optimized for converting a
battery or adapter input into multiple supply voltages. The
ADP3026 provides accurate and reliable short-circuit protection
using an internal current sense circuit, which reduces cost and
increases overall efficiency. Other protection features include
programmable soft start, UVLO, and integrated output
undervoltage/overvoltage protection.
The ADP3026 is specified over the 0°C to 70°C commercial
temperature range and is available in a 28-lead TSSOP package.
APPLICATIONS
Portable instruments
General-purpose dc-to-dc converters
FUNCTIONAL BLOCK DIAGRAM
V
IN
5.5V TO 25V
5V LINEAR
REF
Q1
L1
5V
SMPS
Q4
3.3V
SMPS
Q2
3.3V
Q3
L2
5V
SS5
SS3
PWRGD
ADP3026
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
© 2004 Analog Devices, Inc. All rights reserved.
02950-001
POWER-ON
RESET
ADP3026
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
ESD Caution.................................................................................. 5
Pin Configuration and Function Descriptions............................. 6
Typical Performance Characteristics ............................................. 8
Theory of Operation ...................................................................... 10
Circuit Description .................................................................... 10
Application Information ........................................................... 11
Layout Considerations............................................................... 16
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
REVISION HISTORY
10/04—Revision 0: Initial Version
Rev. 0 | Page 2 of 20
ADP3026
SPECIFICATIONS
@ T
A
= 0°C to 70°C, V
IN
= 12 V, SS5 = SS3 = INTVCC, INTVCC Load = 0 mA, REF Load = 0 mA, SD = 5 V, unless otherwise noted.
All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC) methods.
Table 1.
Parameter
INTERNAL 5 V REGULATOR
Input Voltage Range
5 V Voltage
Line Regulation
Total Variation
Undervoltage Lockout
Threshold Voltage
Undervoltage Lockout
Hysteresis
REFERENCE
Output Voltage
1
SUPPLY CURRENT
Shutdown Current
Standby Current
Quiescent Current
Symbol
INTVCC
Conditions
Min
5.5
4.95
4.8
4.05
Typ
Max
25
5.15
5.2
4.5
Unit
V
V
mV/V
V
V
T
A
= 25°C
5.5 V ≤ V
IN
≤ 25 V
Line, temperature
INTVCC falling
5.02
1.0
4.25
270
mV
REF
I
Q
5.5 V ≤ V
IN
≤ 25 V
SD = 0 V
SS3 = SS5 = 0 V
SD = 5 V
No loads
SS3 = SS5 = 5 V
FB5 = 5.05 V, FB3 = 3.33 V
784
800
19
120
1.3
816
50
200
1.9
V
µA
µA
mA
OSCILLATOR
Frequency
POWER GOOD
Output Voltage in Regulation
Output Voltage out of Regulation
PWRGD Trip Threshold
PWRGD Hysteresis
CPOR Pull-Up Current
ERROR AMPLIFIER
DC Gain
2
Gain-Bandwidth Product
MAIN SMPS CONTROLLERS
Fixed 5 V Output Voltage
Fixed 3.3 V Output Voltage
Current Limit Threshold
CLSET5 = CLSET3 = Floating
CLSET5 = CLSET3 = 0 V
Soft-Start Current
Soft-Start Turn-On Threshold
Transition Time (DRVL)
Rise
Fall
Transition Time (DRVH)
Rise
Fall
Logic Input Low Voltage
Logic Input High Voltage
2
f
OSC
PWRGD
5.5 V ≤ V
IN
≤ 25 V
10 kΩ pull-up to 5 V
10 kΩ pull-up to 5 V
FB5 < 90% of nominal output value
FB5 rising
FB5 falling
CPOR = 1.2 V
165
4.8
200
235
kHz
V
V
%
%
µA
dB
MHz
0.4
−6
−3
−3.7
4
−1
47
10
−1.5
−0.3
GBW
FB5
FB3
5.5 V ≤ V
IN
≤25 V
5.5 V ≤ V
IN
≤25 V
5.5 V ≤ V
IN
≤ 25 V, T
A
= 25°C
5.5 V ≤ V
IN
≤ 25 V, T
A
= 25°C
SS3 = SS5 = 3 V
SS5, SS3
t
R
(DRVL)
t
F
(DRVL)
t
R
(DRVH)
t
F
(DRVH)
C
LOAD
= 3000 pF, 10% to 90%
C
LOAD
= 3000 pF, 90% to 10%
C
LOAD
= 3000 pF, 10% to 90%
C
LOAD
= 3000 pF, 90% to 10%
SD
SD
4.90
3.234
54
240
0.7
0.4
5.0
3.3
72
300
2.1
0.6
40
45
50
50
5.10
3.366
90
360
3.8
0.8
70
70
100
100
0.6
V
V
mV
mV
µA
V
ns
ns
ns
ns
V
V
2.9
Rev. 0 | Page 3 of 20
ADP3026
Parameter
FAULT PROTECTION
Output Overvoltage Trip Threshold
Output Undervoltage Lockout Threshold
Symbol
Conditions
With respect to nominal output
With respect to nominal output
Min
115
70
Typ
120
80
Max
125
90
Unit
%
%
1
2
The reference’s line regulation error is insignificant. The reference cannot be used for external load.
Guaranteed by design, not tested in production.
Rev. 0 | Page 4 of 20
ADP3026
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
V
IN
to AGND
AGND to PGND
INTVCC
BST5, BST3 to PGND
BST5 to SW5
BST3 to SW3
CS5, CS3
SW3, SW5 to PGND
SD
DRVL5/3 to PGND
DRVH5/3 to SW5/3
All Other Inputs and Outputs
θ
JA
Operating Ambient
Temperature Range
Junction Temperature Range
Storage Temperature Range
Lead Temperature Range
(Soldering 10 s)
Rating
−0.3 V to +27 V
±0.3 V
AGND − 0.3 V to +6 V
−0.3 V to +32 V
−0.3 V to +6 V
−0.3 V to +6 V
AGND − 0.3 V to VIN
−2 V to VIN + 0.3 V
AGND − 0.3 V to +27 V
−0.3 V to INTVCC + 0.3 V
−0.3 V to INTVCC + 0.3 V
AGND − 0.3 V to INTVCC + 0.3 V
98°C/W
0°C to 70°C
0°C to 150°C
−65°C to +150°C
300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability. Absolute maximum ratings apply individually
only, not in combination. Unless otherwise specified, all other
voltages are referenced to GND.
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on
the human body and test equipment and can discharge without detection. Although this product features
proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy
electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
Rev. 0 | Page 5 of 20
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