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PDF MAX4880 Data sheet ( Hoja de datos )
| Número de pieza | MAX4880 | |
| Descripción | Overvoltage-Protection Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-3776; Rev 0; 7/05
Overvoltage-Protection Controller with
Internal Disconnect Switch
General Description
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
extendedwww.DataSheet4U.com -40°C to +85°C temperature range.
Applications
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
TOP VIEW
Pin Configuration
10 9 8 7 6
MAX4880
12345
Features
♦ 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
Ordering Information
PART
TEMP RANGE
MAX4880ETB -40°C to +85°C
* EP = Exposed Pad
PIN-
PACKAGE
10 TDFN-EP*
TOP
MARK
APJ
Typical Operating Circuit
AC-DC
ADAPTER
5.25V
VIO
IN GATE BTA
BTB
MAX4880
FLAGV
BAT_OK
CB
EN
BTB_SNS
GND
DC-DC
CONVERTER
Li+
3mm x 3mm TDFN
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
Overvoltage-Protection Controller with
Internal Disconnect Switch
(VIN = 5V, TA = +25°C, otherwise noted.)
Typical Operating Characteristics (continued)
CURRENT LIMIT vs. TEMPERATURE
800
700
600
500
400
300
200
VCB = 5V
100 VBTA = 5V
VBTB = 3.6V
0
-40 -15
10
35
TEMPERATURE (°C)
60
85
CURRENT LIMIT vs. VBTB
800
VCB = 5V
700 VBTA = 5V
600
500
400
300
200
100
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
VBTB (V)
www.DataSheet4U.com
PIN
1
2
3
4
5
6
7
8
9
Pin Description
NAME
IN
EN
GATE
BTA
FUNCTION
Input. IN is the power input for the overvoltage (OVP) charge pump. Bypass IN to GND with a 1µF or
larger capacitor to achieve 15kV ESD protection.
Active-Low Enable Input. Driving EN high turns off the external MOSFET. Pulling EN low activates the
overvoltage-protection circuitry and turns on the external MOSFET.
Gate-Drive Output. GATE is the output of an on-chip OVP charge pump. When VUVLO < VIN < VOVLO,
GATE is driven high to turn on the external n-channel MOSFET. When VIN (MIN) < VIN < VUVLO or VIN >
VOVLO, GATE is driven low to turn off the external n-channel MOSFET.
Input Terminal for the Internal-Current-Limited Switch. Connect BTA to the source of the external n-
channel MOSFET. BTA is the power input for the entire device (except the OVP charge pump). Bypass
BTA to GND with a 0.1µF capacitor as close to the device as possible.
Control Input for the Internal-Current-Limited Switch. Drive CB high to leave the internal switch control for
CB
the internal logic. The internal switch turns on and off depending on the battery voltage level. The internal
switch turns off when the battery voltage reaches the BTB trip level (4.2V), and turns back on when the
battery falls by 200mV. Driving CB low turns off the internal switch regardless of the battery voltage.
GND Ground
Output Terminal for the Internal-Current-Limited Switch. When the BTB voltage exceeds the trip level
BTB (4.2V), the internal switch opens. The switch closes only when the BTB voltage drops 200mV below the
trip level.
BTB_SNS Battery-Voltage-Sensing Input. BTB_SNS must be connected to BTB for proper operation. Bypass
BTB_SNS to GND with a 0.1µF capacitor as close to the device as possible.
BAT_OK
Active-Low, Open-Drain, Battery-Voltage-Limit Flag Output. BAT_OK asserts low when the voltage on BTB
exceeds the BTB trip level (4.2V). BAT_OK is disabled when EN goes high.
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet MAX4880.PDF ] | |
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