MAX1804EUB+ Maxim Integrated Products, MAX1804EUB+ Datasheet

IC FEEDBACK INTERGRATOR 10UMAX

MAX1804EUB+

Manufacturer Part Number
MAX1804EUB+
Description
IC FEEDBACK INTERGRATOR 10UMAX
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1804EUB+

Applications
Feedback Generator
Current - Supply
25µA
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
10-MSOP, Micro10™, 10-uMAX, 10-uSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1804 feedback integrator is designed to
improve voltage regulation in power-supply systems.
The device corrects line- and load-regulation problems,
and can be used to compensate for voltage drops in
power-management distribution lines.
The regulation set point is determined by an external
reference voltage applied at the ADJ pin. The differ-
ence between that reference and MAX1804 feedback is
integrated, and a correction current is applied to the
voltage regulator’s feedback.
The MAX1804’s four inputs allow voltage monitoring in
several local and remote locations to correct for distribu-
tion losses caused by long traces, connectors, and
switches. This eliminates the wasteful practice of perma-
nently adjusting the regulator’s output voltage high
enough to correct for worst-case voltage drops. This is
especially helpful in systems where the load current
varies widely and portions of the load are often shut down
or disconnected (for example, in notebook computers).
If a load switch is opened and the output voltage
sensed at one input falls, the MAX1804 automatically
disables that input and adjusts the regulator’s output
voltage to the lowest of remaining active inputs. If all
inputs are disabled, the OUT pin is in a high-imped-
ance state and makes no output voltage correction.
When SHDN is low, the MAX1804 draws less than 1µA
and its inputs and output are high impedance. The
MAX1804 is available in a 10-pin µMAX package, about
half the size of an 8-pin SOIC.
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
19-1737; Rev 0; 7/00
External Four-Input Feedback Integrator for
________________________________________________________________ Maxim Integrated Products
General Description
REF
SYSTEM
SUPPLY
DH
DL
FB
ADJ
COMP
R
OUT
MAX1804
V
IN
GND
OUT
R TOP
SHDN
IN1
IN2
IN3
IN4
V+
R
o High Precision (±1% max Error)
o Low Power (25µA Supply Current)
o Automatic Input Disable
o Shutdown (1µA max Supply Current)
o Inputs and Outputs High Impedance in Shutdown
o +2.7V to +5.5V Supply Range
o 2.8V to 5.5V Regulation Adjust Range
o Parallelable for More than Four Inputs
o 10-Pin µMAX Package
Pin Configuration appears at end of data sheet.
BOTTOM
MAX1804EUB
or When V+ = 0
PART
Remote Feedback Regulators
High-Accuracy Regulators
Desktop/Notebook Computers
Servers and Workstations
Subnotebooks and PDAs
Typical Operating Circuit
Power Supplies
TEMP. RANGE
-40°C to +85°C
Ordering Information
V
V
V
V
OUT
OUT
OUT
OUT
A
B
C
D
Applications
10 µMAX
PIN-PACKAGE
Features
1

Related parts for MAX1804EUB+

MAX1804EUB+ Summary of contents

Page 1

... The MAX1804 is available in a 10-pin µMAX package, about half the size of an 8-pin SOIC. REF ________________________________________________________________ Maxim Integrated Products For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. o High Precision (±1% max Error) o Low Power (25µ ...

Page 2

External Four-Input Feedback Integrator for Power Supplies ABSOLUTE MAXIMUM RATINGS V+, IN1, IN2, IN3, IN4, OUT, ADJ, SHDN to GND...…-0.3V, +6V COMP to GND ....................................................-0.3V, V+ +0.3V Continuous Power Dissipation (T = +70°C) A 10-Pin µMAX (derate 8.3mW/°C above +70°C) ...

Page 3

External Four-Input Feedback Integrator for ELECTRICAL CHARACTERISTICS (continued 0°C to +85° 3.3V 1.2V ADJ erwise noted.) PARAMETER SHDN INPUT Logic Input Voltage High V Logic Input Voltage Low V Logic ...

Page 4

External Four-Input Feedback Integrator for Power Supplies ELECTRICAL CHARACTERISTICS (continued -40°C to +85° 3.3V ADJ PARAMETER SHDN INPUT Logic Input Voltage High V V+ Logic Input Voltage Low V V+ Logic Input ...

Page 5

External Four-Input Feedback Integrator for ( 3.3V 1.2V, V SHDN V ADJ OUT LOAD TRANSIENT RESPONSE (APPLICATION CIRCUIT OF FIGURE2) CH1 CH5 CH4 CH3 CH2 100µs/div CH1 = I ; 1.00A/div LOAD CH5 = ...

Page 6

External Four-Input Feedback Integrator for Power Supplies NAME PIN Sense Input 1. Connect to one four inputs to be monitored. If IN_ is the lowest active input, IN_ will be regulated IN1 1 ...

Page 7

External Four-Input Feedback Integrator for VL C3 VIN 4.5V TO 28V 4.7µF 16V 0.1µF 3 JU1 2 6 SHDN SHDN MAX1653 2 2 SKIP JU2 2 5 SYNC SYNC 3 JU4 3 REF REF ...

Page 8

External Four-Input Feedback Integrator for Power Supplies OUT 11V OFF 10µF MAX603 GND SET R R BOTTOM TOP 100k 300k R TOP 600k 1.25V V+ SHDN SET REFERENCE IN1 ADJ IN2 MAX1804 IN3 COMP IN4 GND 2200pF ...

Page 9

External Four-Input Feedback Integrator for SHUTDOWN OUT 470pF COMP GND Figure 4. MAX1804 Functional Block Diagram _______________________________________________________________________________________ V BATT V+ SYSTEM DC/DC FB3 FB5 GND 390k SHDN V+ UVLO LOGIC 120µS m ...

Page 10

External Four-Input Feedback Integrator for Power Supplies R TOP R FB MAX1653 R BOTTOM G ND SHORT COMPACT PLACEMENT OF FEEDBACK RESISTORS REDUCES NOISE PICKUP Figure 5. Proper Layout of Feedback Resistors for Regulator Applications Information Layout Information Proper layout ...

Page 11

... Maxim reserves the right to change the circuitry and specifications without notice at any time. implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ...

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