ADP3026ARU Analog Devices, ADP3026ARU Datasheet

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ADP3026ARU

Manufacturer Part Number
ADP3026ARU
Description
High-Efficiency Notebook Computer Power Supply Controller
Manufacturer
Analog Devices
Datasheet
1.ADP3026ARU.pdf (19 pages)
a
REV. PrB
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.
FEATURES
FEATURES
FEATURES
Wide Input Voltage Range: 6.5 V to 25 V
Wide Input Voltage Range: 6.5 V to 25 V
Wide Input Voltage Range: 6.5 V to 25 V
High Conversion Efficiency > 96%
High Conversion Efficiency > 96%
High Conversion Efficiency > 96%
Int
Int
Integrated Current Sense—No External Resistor Re-
quired
quired
quired
Low Shutdown Current: 14
Low Shutdown Current: 14 A (Typical)
Low Shutdown Current: 14
Voltage Mode PWM with Input Feed Forward for Fast
Voltage Mode PWM with Input Feed Forward for Fast
Voltage Mode PWM with Input Feed Forward for Fast
Dual Synchronous Buck Controllers with PWM/
Dual Synchronous Buck Controllers with PWM/
Dual Synchronous Buck Controllers with PWM/
Built-In Gate Drive Boost Circuit for Driving Exter-
Built-In Gate Drive Boost Circuit for Driving Exter-
Built-In Gate Drive Boost Circuit for Driving Exter-
nal
nal
nal
Two Fixed Output Voltages: 3.3 V, 5 V
Two Fixed Output Voltages: 3.3 V, 5 V
Two Fixed Output Voltages: 3.3 V, 5 V
Extensive Circuit Protection Functions
Extensive Circuit Protection Functions
Extensive Circuit Protection Functions
28-Lead TSSOP Package
28-Lead TSSOP Package
28-Lead TSSOP Package
APPLICATIONS
APPLICATIONS
APPLICATIONS
Notebook Computers and PDAs
Notebook Computers and PDAs
Notebook Computers and PDAs
Portable Instruments
Portable Instruments
Portable Instruments
General Purpose DC-DC Converters
General Purpose DC-DC Converters
General Purpose DC-DC Converters
Preliminary Technical Data
FEATURES
FEATURES
Wide Input Voltage Range: 6.5 V to 25 V
Wide Input Voltage Range: 6.5 V to 25 V
High Conversion Efficiency > 96%
High Conversion Efficiency > 96%
Int
Int
quired
quired
Low Shutdown Current: 14
Low Shutdown Current: 14
Voltage Mode PWM with Input Feed Forward for Fast
Voltage Mode PWM with Input Feed Forward for Fast
Dual Synchronous Buck Controllers with PWM/
Dual Synchronous Buck Controllers with PWM/
Built-In Gate Drive Boost Circuit for Driving Exter-
Built-In Gate Drive Boost Circuit for Driving Exter-
nal
nal
Two Fixed Output Voltages: 3.3 V, 5 V
Two Fixed Output Voltages: 3.3 V, 5 V
Extensive Circuit Protection Functions
Extensive Circuit Protection Functions
28-Lead TSSOP Package
28-Lead TSSOP Package
APPLICATIONS
APPLICATIONS
Notebook Computers and PDAs
Notebook Computers and PDAs
Portable Instruments
Portable Instruments
General Purpose DC-DC Converters
General Purpose DC-DC Converters
PWM Frequency: 300 kHz
PWM Frequency: 300 kHz
PWM Frequency: 300 kHz
PWM Frequency: 300 kHz
PWM Frequency: 300 kHz
Line Transient Response
Line Transient Response
Line Transient Response
Power-Saving Mode Operation
Power-Saving Mode Operation
Power-Saving Mode Operation
N-Channel MOSFETs
N-Channel MOSFETs
N-Channel MOSFETs
Line Transient Response
Line Transient Response
Power-Saving Mode Operation
Power-Saving Mode Operation
N-Channel MOSFETs
N-Channel MOSFETs
egrated Current Sense—No External Resistor Re-
egrated Current Sense—No External Resistor Re-
egrated Current Sense—No External Resistor Re-
egrated Current Sense—No External Resistor Re-
6.5V TO 25V
3/12/02
V
5V
IN
L2
Q3
Q4
A (Typical)
A (Typical)
A (Typical)
A (Typical)
PWRGD
SS5
FUNCTIONAL BLOCK DIAGRAM
ADP3026
POWER-ON
RESET
SMPS
5V
High-Efficiency Notebook Computer
5V LINEAR
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
GENERAL DESCRIPTION
The ADP3026 is a highly efficient dual synchronous buck
switching regulator controller optimized for converting the
battery or adapter input into the system supply voltages re-
quired in notebook computers. The ADP3026 uses a
dual-mode PWM/Power Saving Mode architecture to maintain
efficiency over a wide load range.
The ADP3026 provides accurate and reliable short circuit
protection using an internal current sense circuit, which re-
duces cost and increases overall efficiency. Other protection
features include programmable soft-start, UVLO, and inte-
grated output undervoltage/overvoltage protection.
REF
SMPS
3.3V
Power Supply Controller
World Wide Web Site: http://www.analog.com
SS3
Q1
Q2
L1
© Analog Devices, Inc., 2002
ADP3026
3.3V

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ADP3026ARU Summary of contents

Page 1

... Q4 REV. PrB 3/12/02 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

ADP3026–SPECIFICATIONS REF Load = 0 mA unless otherwise noted.) Parameter INTERNAL 5 V REGULATOR Input Voltage Range 5 V Voltage Line Regulation Total Variation Undervoltage Lockout Threshold Voltage Undervoltage Lockout Hysteresis REFERENCE 2 Output Voltage SUPPLY ...

Page 3

PRELIMINARY TECHNICAL DATA Parameter Power-Saving Mode Trip Threshold 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 FAULT PROTECTION Output Overvoltage Trip Threshold Output Undervoltage Lockout ...

Page 4

PRELIMINARY TECHNICAL DATA ADP3026 Pin No. Mnemonic Function 1 CS5 Current Sense Input for top N-Channel MOSFET of the 5 V Buck Converter. Connect to the drain of the top N-channel MOSFET. 2 FB5 Feedback Input for the 5 V ...

Page 5

... Model Temperature Range ADP3026ARU –40°C to +85°C 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. ...

Page 6

PRELIMINARY TECHNICAL DATA ADP3026 INPUT ADP3026 SD INTVCC 5V LINEAR REG REF 800mV REF 800mV AGND 300kHz PWRGD POWER› RESET 1 A CPOR VIN 72mV + 14mV +5V + ULVO INTVCC CONTROL OSC LOGIC FB5 ON ›3mV 816mV + +2% ...

Page 7

15V 0.01 0.1 OUTPUT CURRENT › A TPC 1. Efficiency vs Output Current 100 15V ...

Page 8

PRELIMINARY TECHNICAL DATA ADP3026 250 CLSET = GND 200 150 100 50 0 › › › › AMBIENT TEMPERATURE › C TPC 7.Current Limit Threshold vs. Temperature 1.210 ...

Page 9

PRELIMINARY TECHNICAL DATA TEK STOP: SINGLE SEQ 250 S CH1 CH2 CH1 10.0V CH2 200mV M 5.00ms CH1 TPC 13 7 Transient Output, IN CH1 – Input Voltage, CH2 – ...

Page 10

PRELIMINARY TECHNICAL DATA ADP3026 THEORY OF OPERATION The ADP3026 is a dual-mode, step-down power supply con- troller for notebook computers or similar battery-powered applications. The device contains two synchronous step- down buck controllers and a linear regulator controller. The buck ...

Page 11

SD SD Shutdown (SD Holding SD = GND low will put the ADP3026 into ultralow current shutdown mode. For automatic start-up, SD can be tied directly to VIN. Soft-Start and Power-Up Sequencing (SS) SS3 and SS5 are soft-start ...

Page 12

PRELIMINARY TECHNICAL DATA ADP3026 handling output currents anywhere from < over 10 A. Throughout this section, design examples and compo- nent values will be given for three different power levels. For simplicity, these levels will be referred to ...

Page 13

PRELIMINARY TECHNICAL DATA ADP3026 CS5 1 C18 470pF FB5 2 R10 EAN5 3 10k R2 C1 15.8k 68pF 4 EAO5 C2 1000pF 5 SS5 R2 C4 47k 22nF 6 CLSET5 REF 7 C5 22nF 8 AGND R3 47k 9 CLSET3 ...

Page 14

PRELIMINARY TECHNICAL DATA ADP3026 – V RMS OUT IN OUT This formula has a maximum /2. Note that the capacitor manufacturer’s ripple OUT current ratings are often based on only 2000 hours ...

Page 15

PRELIMINARY TECHNICAL DATA Upper MOSFET Duty Cycle= Lower MOSFET Duty Cycle From the duty cycle, the required minimum R each MOSFET can be derived by the following equations: Upper MOSFET Upper ) ...

Page 16

PRELIMINARY TECHNICAL DATA ADP3026 Fixed or Adjustable Output Voltage Each switching controller of the ADP3026 can be pro- grammed to operate with a fixed or adjustable output voltage. As shown by the general application schematic in Figure 2, putting the ...

Page 17

ADP3026 PWM DRVH COMPARATOR V RAMP DRVL C2 EAO C1 R2 EAN R1 REF FB Figure 3. Buck Regulator Voltage Control Loop The pulsewidth modulator transfer function is V VEA , where VEA is the output voltage of the error ...

Page 18

PRELIMINARY TECHNICAL DATA ADP3026 4. If critical signal lines (including the voltage and cur- rent sense lines of the ADP3026) must cross through power circuitry best if a signal ground plane can be interposed between those signal lines ...

Page 19

PRELIMINARY TECHNICAL DATA PIN 1 0.006 (0.15) 0.002 (0.05) SEATING PLANE REV. PrB OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 28-Lead TSSOP (RU-28) 0.386 (9.80) 0.378 (9.60 0.177 (4.50) 0.169 (4.30) 0.256 (6.50) 0.246 (6.25 ...

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