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Part: MAX1888EUA
Category:
Power Management
-> Battery Management
Description: MAX1888 Low-cost Integrated Offset Logic For Notebook Cpu Power Supplies
Company: Maxim Integrated Products
Datasheet: Download MAX1888EUA datasheet File size : 505 kB
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Datasheet text preview:
19-2189; Rev 1; 2/02
Low-Cost Integrated Offset Logic for Notebook CPU Power Supplies
General Description
The MAX1888 is a three-input decoder with three opendrain outputs. It is used with the MAX1718 or a similar DC-to-DC controller to offset the CPU core voltage in notebook computers. Designed to interface with lowvoltage logic, the MAX1888 can program the controller for three independent offsets. The circuit is extremely low cost and is available in an 8-pin µMAX package.
Features
o Simple, Low-Cost Offset Voltage Control for CPU Core Power Supplies o IMVP II Logic Interface o 3V to 5.5V Supply Voltage o Low 30µA (max) Supply Current o 8-Pin µMAX Package
MAX1888
Applications
CPU Core Supplies for Intel IMVP II Notebook Computers
PART MAX1888EUA
Ordering Information
TEMP RANGE -40°C to +85°C PIN-PACKAGE 8 µMAX
Minimal Operating Circuit
TOP VIEW
POS VCC MAX1888 NEG LOWVOLTAGE LOGIC INPUTS DPSLP PERF SUS GND BSM PSM BOM OPEN-DRAIN DECODER OUTPUTS OFFSET ADJUST DPSLP PERF SUS GND 1 2 3 4
Pin Configuration
INPUT SUPPLY
8
VCC BSM PSM BOM
MAX1888
7 6 5
µMAX
________________________________________________________________ Maxim Integrated Products
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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.
Low-Cost Integrated Offset Logic for Notebook CPU Power Supplies MAX1888
ABSOLUTE MAXIMUM RATINGS
VCC to GND .....-0.3V to +6V PERF, SUS, DPSLP, BOM, PSM, BSM to GND ........-0.3V to +6V Continuous Power Dissipation 8-Pin µMAX (derate 4.5mW/°C above +70°C) ..362.0mW Extended Operating Temperature.....-40°C to +85°C Junction Temperature ......+150°C Storage Temperature........-65°C to +150°C Lead Temperature (soldering, 10s) .........+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, VCC = +5V, TA = -40°C to +85°C, unless otherwise noted.)
PARAMETER POWER SUPPLY Supply Voltage Range (VCC) BIAS Quiescent Supply Current (VCC) LOGIC AND I/Os Logic Input High Voltage (PERF, SUS, DPSLP), Hysteresis = 40mV (typ) Logic Input Low Voltage (PERF, SUS, DPSLP), Hysteresis = 40mV (typ) Logic Input Current Output On-Resistance (BOM, BSM, PSM) Output Leakage Current (BOM, BSM, PSM) DYNAMICS Falling edge, 1.5V to 0V step in 2ns Propagation Delay Rising edge, 0 to 1.5V step in 2ns 700 70 ns ILOAD = 5mA ILOAD = 5mA, 3V < VCC < 5.5V V(pin) = 5V < 0.01 3V < VCC < 5.5V 1.2 V All inputs = 0 All inputs = 1.5V < 0.01 10 1 30 µA 3.0 5.5 V CONDITIONS MIN TYP MAX UNITS
0.4 V 3V < VCC < 5.5V -1 20 0.3 1 50 100 1 µA µA
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Low-Cost Integrated Offset Logic for Notebook CPU Power Supplies
Typical Operating Characteristics
(Circuit of Figure 1, logic high = 1.5V, VOUT = 1.3V, TA = +25°C, unless otherwise noted.)
MAX1888
SUPPLY CURRENT vs. SUPPLY VOLTAGE
100
MAX1888toc01
SUPPLY CURRENT VS. TEMPERATURE
MAX1888 toc02
OUTPUT RON VS. SUPPLY VOLTAGE
TA = +85°C TA = +25°C 30 TA = -40°C RON ()
MAX1888 toc03
16 A B SUPPLY CURRENT (µA) 12 VCC = 5V
40 35
10 SUPPLY CURRENT (µA)
1
8 VCC = 4.5V 4 VCC = 3.3V 0
25 20 15 10
0.1 C D 0.01
0.001 3.0 3.5 4.0 4.5 5.0 5.5 VCC (V) A = ALL INPUTS = 1.5V B = ALL INPUTS = 3.3V C = ALL INPUTS = 5V D = ALL INPUTS = 0.4V
-40
-15
10
35
60
85
3.0
3.5
4.0
4.5
5.0
5.5
TEMPERATURE (°C)
VCC (V)
OUTPUT RON VS. TEMPERATURE
MAX1888 toc04
SWITCHING CHARACTERISTICS (OUTPUT TRANSITIONS INTO A 10k LOAD)
MAX1888 toc05
SWITCHING CHARACTERISTICS (OUTPUT TRANSITIONS INTO A 10k LOAD)
MAX1888 toc06
40 35 VCC = 3.3V 30 RON () 25 20 15 10 -40 -15 10 35 60 VCC = 5V
A A
B
VCC = 3.3V B
VCC = 5V VCC = 3.3V 400ns/div A = VIN, 1V/div B = VOUT, 1V/div
VCC = 5V 85 A = VIN, 1V/div B = VOUT, 1V/div 20ns/div
TEMPERATURE (°C)
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME DPSLP PERF SUS GND BOM PSM BSM VCC FUNCTION Deep-Sleep Mode Control Digital Input Performance-Mode Offset Control Digital Input Suspend-Mode (Deeper Sleep) Control Digital Input Ground Open-Drain Output for Battery Operating Mode (BOM) Open-Drain Output for Performance Sleep Mode (PSM) Open-Drain Output for Battery Sleep Mode (BSM) Supply Voltage
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