MAX1809EEE+ Maxim Integrated Products, MAX1809EEE+ Datasheet

IC DDR TERMINATION 16-QSOP

MAX1809EEE+

Manufacturer Part Number
MAX1809EEE+
Description
IC DDR TERMINATION 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX1809EEE.pdf (17 pages)

Specifications of MAX1809EEE+

Applications
Converter, DDR
Voltage - Input
3 ~ 5.5 V
Number Of Outputs
1
Voltage - Output
1.1 ~ 5.5 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-QSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1809 is a reversible energy flow, constant-off-
time, pulse-width modulated (PWM), step-down DC-DC
converter. It is ideal for use in notebook and subnote-
book computers that require 1.1V to 5V active
termination power supplies. This device features an
internal PMOS power switch and internal synchronous
rectifier for high efficiency and reduced component
count. The internal 90mΩ PMOS power switch and
70mΩ NMOS synchronous-rectifier switch easily deliver
continuous load currents up to 3A. The MAX1809 accu-
rately tracks an external reference voltage, produces
an adjustable output from 1.1V to V
efficiencies as high as 93%.
The MAX1809 uses a unique current-mode, constant-
off-time, PWM control scheme that allows the output to
source or sink current. This feature allows energy to
return to the input power supply that otherwise would
be wasted. The programmable constant-off-time archi-
tecture sets switching frequencies up to 1MHz, allowing
the user to optimize performance trade-offs between
efficiency, output switching noise, component size, and
cost. The MAX1809 features an adjustable soft-start to
limit surge currents during startup, a 100% duty-cycle
mode for low-dropout operation, and a low-power shut-
down mode that disables the power switches and
reduces supply current below 1µA. The MAX1809 is
available in a 28-pin QFN with an exposed backside
pad, a 28-pin thin QFN, or a 16-pin QSOP.
19-2142; Rev 1; 9/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
V
IN
DDR Memory Termination
Active Termination Buses
V
3A, 1MHz, DDR Memory Termination Supply
SET
Typical Operating Circuit
IN
V
SHDN
EXTREF
TOFF
CC
________________________________________________________________ Maxim Integrated Products
MAX1809
General Description
PGND
GND
REF
SS
LX
FB
Applications
IN
, and achieves
V
OUT
o Source/Sink 3A
o ±1% Output Accuracy
o Up to 1MHz Switching Frequency
o 93% Efficiency
o Internal PMOS/NMOS Switches
o 1.1V to V
o 3V to 5.5V Input Voltage Range
o <1µA Shutdown Supply Current
o Programmable Constant-Off-Time Operation
o Thermal Shutdown
o Adjustable Soft-Start Inrush Current Limiting
o Output Short-Circuit Protection
*Contact factory for availability.
Pin Configurations continued at end of data sheet.
MAX1809EGI*
MAX1809EEE
MAX1809ETI
90mΩ/70mΩ On-Resistance at V
110mΩ/80mΩ On-Resistance at V
TOP VIEW
PART
EXTREF
N.C.
N.C.
SS
LX
IN
IN
IN
1
2
3
4
5
6
7
Adjustable Output Voltage
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Ordering Information
TEMP RANGE
THIN QFN
MAX1809
Pin Configurations
IN
PIN-PACKAGE
28 QFN
16 QSOP
28 Thin QFN
IN
Features
21
20
19
18
17
16
15
= 4.5V
= 3V
PGND
PGND
LX
LX
PGND
V
GND
CC
1

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MAX1809EEE+ Summary of contents

Page 1

... FB SHDN V SET EXTREF REF TOFF SS ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. o Source/Sink 3A o ±1% Output Accuracy 1MHz Switching Frequency o 93% Efficiency o Internal PMOS/NMOS Switches 90mΩ/70mΩ On-Resistance at V 110mΩ ...

Page 2

DDR Memory Termination Supply ABSOLUTE MAXIMUM RATINGS GND ........................................................-0. .............................................................................±0.3V CC GND to PGND.....................................................................±0.3V SHDN, SS, FB OFF REF EXTREF to GND.......................................-0. ...

Page 3

DDR Memory Termination Supply ELECTRICAL CHARACTERISTICS (continued 3.3V 1.1V EXTREF A PARAMETER SYMBOL SS Source Current SS Sink Current SHDN Input Current SHDN Logic Levels Maximum Output RMS Current ...

Page 4

DDR Memory Termination Supply (Circuit of Figure 1.25V, for V OUT IN EFFICIENCY vs. OUTPUT CURRENT (SOURCING) 100 R = 0Ω DROOP 5V 2.5V 75 OUT ...

Page 5

DDR Memory Termination Supply (Circuit of Figure 1.25V, for V OUT LOAD-TRANSIENT RESPONSE 0V 0A 10µs/div V = 1.25V 3.3V, I EXTREF IN OUT SWITCHING WAVEFORMS (SOURCING 400ns/div I = 2A, ...

Page 6

DDR Memory Termination Supply PIN (QFN) PIN (QSOP 10, 11, 12, — 22, 24, 26 18, 19 ...

Page 7

DDR Memory Termination Supply V 10Ω 2.2µF V DDQ (2.5V) 10kΩ 10kΩ V SSQ Figure 1. Typical Application Circuit feedback voltage exceeds the external reference voltage ( the positive current limit is reached. When EXTREF the ...

Page 8

DDR Memory Termination Supply where C = 2.5nF and f is the switching frequency. SW Resistive losses in the two power switches are approxi- mated by: 2 ✕ D(RES) OUT PMOS where R is ...

Page 9

DDR Memory Termination Supply SOURCE SYNCHRONOUS BUCK MODE (SOURCING CURRENT SINK SYNCHRONOUS BOOST MODE (SINKING CURRENT) Figure 3. Sourcing and Sinking Capabilities of the MAX1809 Programming the Switching Frequency and Off-Time and ...

Page 10

DDR Memory Termination Supply to maximum DC load current. A higher value of LIR allows smaller inductance but results in higher losses and ripple. A good compromise between size and losses is found at approximately a 25% ripple ...

Page 11

DDR Memory Termination Supply LX V DDQ MAX1809 V EXTREF FB EXTREF (1.1V ≤ V ≤ 1.7V) EXTREF IN Figure 5. Adjusting the Output Voltage Using EXTREF The output current limit during soft-start varies with the ...

Page 12

DDR Memory Termination Supply output regulates at a slightly lower voltage under a given load, allowing more voltage headroom as the load changes suddenly to zero or to the opposite polarity (sinking mode). By utilizing the full-voltage tolerance ...

Page 13

DDR Memory Termination Supply INPUT VOLTAGE (3V TO 5.5V 10Ω 2.2µF SHDN SHDN Figure 9. Discharging the Output of the MAX1809 in Shutdown INPUT VOLTAGE (3V TO 5.5V ...

Page 14

DDR Memory Termination Supply before startup, a 100Ω resistor should be added in the feedback path, and a diode from shown in Figure 10. SS will keep FB low during the startup sequence, ensuring ...

Page 15

DDR Memory Termination Supply (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information (continued) 15 ...

Page 16

DDR Memory Termination Supply (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) 16 ______________________________________________________________________________________ Package Information (continued) ...

Page 17

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17 © 2002 Maxim Integrated Products ...

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