MAX4880ETB-T Maxim Integrated, MAX4880ETB-T Datasheet

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MAX4880ETB-T

Manufacturer Part Number
MAX4880ETB-T
Description
Power Switch ICs - Power Distribution
Manufacturer
Maxim Integrated
Datasheet
19-3776; Rev 0; 7/05
The MAX4880 is an overvoltage-protection controller
with an internal current-limited switch that can be con-
figured as a low-cost battery charger. When the input
voltage exceeds the overvoltage trip level (5.7V), or
drops below the undervoltage-lockout level (4.2V), the
MAX4880 turns off the external n-channel MOSFET and
asserts an undervoltage/overvoltage flag indicator
(FLAGV) low to notify the processor.
The MAX4880 internal current-limited switch limits the
charge current flowing to the battery to 525mA. The
switch opens when the battery voltage reaches its full-
charged state (4.2V), and a flag (BAT_OK) asserts to
notify the processor. The MAX4880 includes a switch-
control input (CB) to turn off the internal current-limited
switch, regardless of the battery voltage.
The MAX4880 also features a built-in startup delay that
allows the adapter voltage to settle down before turning
on the MOSFET. Other features include 15kV ESD pro-
tection for the input and a shutdown function (EN) to
turn off the external n-channel MOSFET.
The MAX4880 is available in a space-saving 10-pin
TDFN package and is specified for operation over the
extended -40°C to +85°C temperature range.
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.
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________________________________________________________________ Maxim Integrated Products
10
1
3mm x 3mm TDFN
Overvoltage-Protection Controller with
9
2
MAX4880
General Description
8
3
Pin Configuration
7
4
Applications
6
5
Internal Disconnect Switch
♦ Overvoltage Protection Up to 28V
♦ Preset 5.6V Overvoltage Trip Level
♦ Internal 525mA Current-Limited Switch
♦ ±1.2% Accurate Battery Disconnect (4.2V)
♦ Drives Low-Cost n-Channel MOSFET
♦ Internal 50ms Startup Delay
♦ Overvoltage/Undervoltage-Fault FLAGV Indicator
♦ Battery-Voltage-Trip BAT_OK Indicator
♦ Undervoltage Lockout
♦ Thermal Shutdown Protection
♦ Tiny 10-Pin TDFN Package
* EP = Exposed Pad
MAX4880ETB
ADAPTER
AC-DC
5.25V
PART
V
IO
Typical Operating Circuit
-40°C to +85°C
TEMP RANGE
FLAGV
BAT_OK
CB
EN
IN
Ordering Information
MAX4880
GATE
GND
BTB_SNS
BTA
BTB
PIN-
PACKAGE
10 TDFN-EP*
Features
CONVERTER
Li+
DC-DC
MARK
TOP
APJ
1

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MAX4880ETB-T Summary of contents

Page 1

... Accurate Battery Disconnect (4.2V) ♦ Drives Low-Cost n-Channel MOSFET ♦ Internal 50ms Startup Delay ♦ Overvoltage/Undervoltage-Fault FLAGV Indicator ♦ Battery-Voltage-Trip BAT_OK Indicator ♦ Undervoltage Lockout ♦ Thermal Shutdown Protection ♦ Tiny 10-Pin TDFN Package PART MAX4880ETB Applications * EP = Exposed Pad AC-DC ADAPTER 5.25V 6 5 Features ...

Page 2

Overvoltage-Protection Controller with Internal Disconnect Switch ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND.) IN ............................................................................-0.3V to +30V GATE ......................................................................-0.3V to +12V EN, CB, FLAGV, BAT_OK, BTA, BTB, BTB_SNS .....-0.3V to +6V Continuous Power Dissipation (T = +70°C) A 10-Pin ...

Page 3

Overvoltage-Protection Controller with ELECTRICAL CHARACTERISTICS (continued 5V -40°C to +85°C, unless otherwise noted. Typical values are PARAMETER SYMBOL FLAGV Assertion Delay Initial Overvoltage Fault Delay Disable Time EN, CB INPUTS Input-High Voltage ...

Page 4

Overvoltage-Protection Controller with Internal Disconnect Switch ( +25°C, otherwise noted BTB TRIP LEVEL vs. INPUT VOLTAGE 4.20 4.16 4.12 4.08 4.04 4.00 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 INPUT VOLTAGE (V) POWER-UP ...

Page 5

Overvoltage-Protection Controller with ( +25°C, otherwise noted.) IN CURRENT LIMIT vs. TEMPERATURE 800 700 600 500 400 300 200 100 BTA V = 3.6V BTB 0 -40 -15 10 ...

Page 6

Overvoltage-Protection Controller with Internal Disconnect Switch PIN NAME Active-Low, Open-Drain-Fault Flag Output. FLAGV goes low when either an overvoltage or undervoltage FLAGV fault occurs at IN. FLAGV is disabled when EN goes high. During startup, FLAGV has a delay of ...

Page 7

Overvoltage-Protection Controller with EN GATE IN 10V OVLO IN CHARGE PUMP UVLO BAT_OK 525mA LIMIT I FLAGV REF CHARGE PUMP V REF MAX4880 GND Figure 5. Functional Diagram Detailed Description The MAX4880 provides up to 28V overvoltage protection for low-voltage ...

Page 8

Overvoltage-Protection Controller with Internal Disconnect Switch 1MΩ 1.5kΩ DISCHARGE CHARGE-CURRENT- RESISTANCE LIMIT RESISTOR HIGH STORAGE VOLTAGE 100pF CAPACITOR DC SOURCE Figure 6. Human-Body ESD Test Model 50Ω to 100Ω 330Ω ...

Page 9

Overvoltage-Protection Controller with Table 1. MOSFET Suggestions CONFIGURATION/ PART PACKAGE Si1426DH Single/SC70-6 FDG315N Single/SC70-6 tank circuit and provide protection if necessary to pre- vent exceeding the 30V absolute maximum rating on IN. The MAX4880 provides protection against voltage faults up ...

Page 10

... 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 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products © ...

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