Maxim MAX4882ETB Overvoltage protection controllers with current limit in tdfn Datasheet

19-3777; Rev 2; 10/06
Overvoltage Protection Controllers with
Current Limit in TDFN
Features
♦ Overvoltage Protection Up to 28V
♦ Preset Overvoltage Trip Level
5.6V (MAX4881/MAX4883/MAX4893B)
4.5V (MAX4882/MAX4884)
♦ Internal Current-Limited Switch
1.1A (MAX4881/MAX4882)
0.7A (MAX4883/MAX4884)
0.9A (MAX4893B)
♦ Drives Low-Cost n-Channel MOSFET
♦ Internal 50ms Startup Delay
♦ Overvoltage Fault OV Indicator
♦ Current-Limit Fault FLAGI Indicator
♦ Undervoltage Lockout
♦ Thermal Shutdown Protection
♦ Tiny 10-Pin TDFN Package
The MAX4881–MAX4884/MAX4893B overvoltage protection (OVP) controllers with built-in current-limited
switch, protect low-voltage systems against voltages of
up to 28V. When the input voltage exceeds the overvoltage trip level of 5.6V (MAX4881/MAX4883/MAX4893B) or
4.5V (MAX4882/MAX4884), the external n-channel MOSFET is turned off to prevent damage to the protected
components. An undervoltage/overvoltage flag indicator
(OV) notifies the processor that an undervoltage/overvoltage fault condition is present.
The MAX4881/MAX4882 feature an internal 1.1A
current-limited switch, while the MAX4883B/MAX4883C/
MAX4884B/MAX4884C include an internal 0.7A currentlimited switch. The MAX4893B includes a 0.9A currentlimited switch. When the load current is at the current
limit for longer than the blanking time, the switch of the
MAX4881/MAX4882/MAX4883B/MAX4884B/
MAX4893B latches off and does not turn back on until
EN, CB, or IN is cycled. A current-limit flag (FLAGI)
asserts to indicate a current fault condition.
PART
PIN-PACKAGE
GND
8
7
6
3
4
BTA
5
CB
2
GATE
IN
1
MAX4881
MAX4882
MAX4883
MAX4884
MAX4893B
EN
+
3mm x 3mm TDFN
*CONNECT EXPOSED PAD TO GND.
PDAs and Palmtop Devices
MP3 Players
TEMP RANGE
9
*EP
Applications
Cell Phones
Digital Still Cameras
BTB
10
FLAGI
TOP VIEW
N.C.
The MAX4883C/MAX4884C limit the current to 0.7A
indefinitely until the thermal protection trips. An overcurrent flag output asserts to indicate a current fault condition after the blanking time has elapsed.
The MAX4881–MAX4884/MAX4893B have a control
input (CB) that is used to turn on and off the internal current-limited switch. Other features include a shutdown
function (EN) to disable the external n-channel MOSFET,
and a built-in startup delay to allow the adapter voltage
to settle down before turning on the MOSFET.
The MAX4881–MAX4884/MAX4893B are offered in a
space-saving 10-pin TDFN package and operate over
the extended -40°C to +85°C temperature range.
OV
Pin Configuration
Ordering Information
OV TRIP
LEVEL (V)
CURRENT
LIMIT (A)
CURRENT-LIMIT
MODE
TOP
MARK
PKG
CODE
MAX4881ETB
-40°C to +85°C
10 TDFN-EP*
5.6
1.1
LATCHOFF
APK
T1033-1
MAX4882ETB
-40°C to +85°C
10 TDFN-EP*
4.5
1.1
LATCHOFF
APL
T1033-1
MAX4883BETB
-40°C to +85°C
10 TDFN-EP*
5.6
0.7
LATCHOFF
APM
T1033-1
MAX4883CETB
-40°C to +85°C
10 TDFN-EP*
5.6
0.7
CONTINUOUS
APN
T1033-1
MAX4884BETB**
-40°C to +85°C
10 TDFN-EP*
4.5
0.7
LATCHOFF
APO
T1033-1
MAX4884CETB**
-40°C to +85°C
10 TDFN-EP*
4.5
0.7
CONTINUOUS
APP
T1033-1
MAX4893BETB
-40°C to +85°C
10 TDFN-EP*
5.6
0.9
LATCHOFF
ATF
T1033-1
* EP = Exposed pad.
**Future product—contact factory for availability.
________________________________________________________________ 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.
1
MAX4881–MAX4884/MAX4893B
General Description
MAX4881–MAX4884/MAX4893B
Overvoltage Protection Controllers with
Current Limit in TDFN
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.)
IN ............................................................................-0.3V to +30V
GATE ......................................................................-0.3V to +12V
EN, CB, OV, FLAGI, BTA, BTB ................................-0.3V to +6V
Continuous Power Dissipation (TA = +70°C)
10-Pin TDFN (derate 18.5mW/°C above +70°C) .....1481.5mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-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
(VIN = +5V (MAX4881/MAX4883/MAX4893B), VIN = +4V (MAX4882/MAX4884), TA = -40°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
28.0
V
INPUT VOLTAGE (IN)
Input Voltage Range
Overvoltage Trip Level
VIN
OVLO
1.2
VIN rising
MAX4881/MAX4883/MAX4893B
5.5
5.6
5.7
MAX4882/MAX4884
4.4
4.5
4.6
Overvoltage-Trip-Level
Hysteresis
Undervoltage Lockout Threshold
50
UVLO
VIN falling
Supply Current
mV
MAX4881/MAX4883/MAX4893B
4.2
4.35
4.5
MAX4882/MAX4884
2.4
2.55
2.7
Undervoltage Lockout Hysteresis
50
IIN + IBTA
No load, VEN = 0 or 5.5V,
VIN = VOVLO (MIN) - 0.1V, VCB = VIN
240
V
V
mV
380
µA
2.8
5.7
V
2.4
2.7
V
INTERNAL SWITCH
BTA Input Range
BTA Undervoltage Lockout
VBTA
BTAUVLO
VBTA falling
BTA-Undervoltage-Lockout
Hysteresis
Switch-Forward Current Limit
Switch-Reverse Current Limit
50
IFWD
IREV
MAX4881/MAX4882, VBTB = GND
1.00
1.1
1.25
MAX4883/MAX4884, VBTB = GND
0.600
0.7
0.775
MAX4893B, VBTB = GND
0.800
1.25
MAX4883/MAX4884
0.775
Blanking Time
BTB Off Current
2
IL = 400mA
A
1
VBTA = 5V
(MAX4881/MAX4883/MAX4893B)
110
VBTA = 4V
(MAX4882/MAX4884)
110
mV
tBLANK
IBTB-OFF
A
1
MAX4881/MAX4882
MAX4893B
Voltage Drop (VBTA - VBTB)
mV
20
50
VEN = 0, VCB = 0
_______________________________________________________________________________________
80
ms
1
µA
Overvoltage Protection Controllers with
Current Limit in TDFN
(VIN = +5V (MAX4881/MAX4883/MAX4893B), VIN = +4V (MAX4882/MAX4884), TA = -40°C to +85°C, unless otherwise noted. Typical
values are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
GATE
GATE Voltage
VGATE
GATE Pulldown Current
IPD
IGATE
sourcing
1µA
VIN = 5V
(MAX4881/MAX4883/MAX4893B)
9
10
7.6
8.6
V
VIN = 4.3V
(MAX4882/MAX4884)
VIN > VOVLO, VGATE = 5.5V
60
mA
TIMING
Startup Delay
tSTART
OV Blanking Time
tOV-BLANK
GATE Turn-On Time
tGON
GATE Turn-Off Time
VIN > VUVLO, VGATE > 0.3V (Figure 1)
20
50
80
VGATE = 0.3V, VOV = 2.4V (Figure 1)
20
50
80
VGATE = 0.3V to 7V, CGATE = 1500pF (Figure 1)
7
VIN increasing from 5V to 8V at 3V/µs,
VGATE = 0.3V, CGATE = 1500pF (Figure 2)
(MAX4881/MAX4883/MAX4893B)
6
20
µs
VIN increasing from 4V to 7V at 3V/µs,
VGATE = 0.3V, CGATE = 1500pF (Figure 2)
(MAX4882/MAX4884)
tOV
ms
ms
tGOFF
OV Assertion Delay
ms
6
VIN increasing from 5V to 8V at 3V/µs,
VOV = 0.4V (Figure 2)
(MAX4881/MAX4883/MAX4893B)
5.8
VIN increasing from 4V to 7V at 3V/µs,
VOV = 0.4V (Figure 2) (MAX4882/MAX4884)
5.8
20
µs
Initial Overvoltage Fault Delay
tOVP
VIN increasing from 0 to 8V,
IGATE = 80% of IPD (Figure 3)
100
ns
Disable Time
tDIS
VEN = 2.4V, VGATE = 0.3V (Figure 4)
580
ns
EN, CB INPUTS
Input-High Voltage
VIH
Input-Low Voltage
VIL
1.4
V
Input Leakage
0.5
V
1
µA
0.4
V
1
µA
OV, FLAGI OUTPUTS
Output Voltage Low
VOL
Leakage Current
ISINK = 1mA, OV, FLAGI assert
VFLAGI = VOV = 5.5V
THERMAL PROTECTION
Thermal Shutdown
150
°C
Thermal Hysteresis
40
°C
Note 1: All devices are 100% tested at TA = +25°C. Electrical limits over the full temperature range are guaranteed by design.
_______________________________________________________________________________________
3
MAX4881–MAX4884/MAX4893B
ELECTRICAL CHARACTERISTICS (continued)
Typical Operating Characteristics
(VIN = 5V, TA = +25°C, unless otherwise noted.)
250
200
150
100
UVLO TRIP POINT
50
OVLO TRIP POINT
300
9
GATE VOLTAGE (V)
OVLO TRIP POINT
250
200
150
100
25
0
-40
30
GATE VOLTAGE vs. INPUT VOLTAGE
(MAX4881)
-15
10
35
TEMPERATURE (°C)
60
85
0
1000
MAX4881 toc04
OVLO TRIP POINT
UVLO TRIP POINT
100
BTB OFF CURRENT (nA)
9
6
3
VEN = 0
VCB = 0
VBTB = 5.5V
1
2
3
4
5
6
INPUT VOLTAGE (V)
7
8
POWER-UP RESPONSE (MAX4884)
BTB OFF CURRENT vs. TEMPERATURE
12
MAX4881 toc06
MAX4881 toc05
10
15
20
INPUT VOLTAGE (V)
6
3
0
5
UVLO TRIP POINT
50
0
0
MAX4881 toc03
350
IIN + IBTA CURRENT (µA)
IIN + IBTA CURRENT (µA)
300
12
MAX4881 toc02
VEN = 0
VCB = 5V
350
400
MAX4881 toc01
400
GATE VOLTAGE vs. INPUT VOLTAGE
(MAX4884)
IIN + IBTA CURRENT vs. TEMPERATURE
IIN + IBTA CURRENT vs. INPUT VOLTAGE
GATE VOLTAGE (V)
MAX4881–MAX4884/MAX4893B
Overvoltage Protection Controllers with
Current Limit in TDFN
5V
IN
10V
GATE
0
10
5V
BTA
1
0
5V
0.1
0
OV
0
0
1
2
3
4
5
6
INPUT VOLTAGE (V)
7
0.01
8
-40
POWER-DOWN RESPONSE (MAX4884)
-15
10
35
TEMPERATURE (°C)
OVERVOLTAGE RESPONSE (MAX4884)
MAX4881 toc08
MAX4881 toc09
5V
5V
EN
0
0
5V
10V
BTA
0
3V
GATE
0
5V
0
OV
0
20mA
IGATE
0
20ms/div
6V
IN
GATE
5V
OV
4
20ms/div
85
EN vs. GATE (MAX4884)
MAX4881 toc07
IN
10V
GATE
0
60
100µs/div
400ns/div
_______________________________________________________________________________________
Overvoltage Protection Controllers with
Current Limit in TDFN
CURRENT LIMIT vs. TEMPERATURE
(MAX4881)
CURRENT LIMIT vs. TEMPERATURE
(MAX4884)
700
MAX4881 toc11
1.25
MAX4881 toc10
800
1.00
CURRENT LIMIT (A)
CURRENT LIMIT (mA)
600
500
400
300
200
VIN = 4.4V
VBTB = 2.7V
VCB = 5V
100
0.75
0.50
VIN = 5V
VBTB = 2.7V
VCB = 5V
0.25
0
0
-40
-15
10
35
TEMPERATURE (°C)
60
-40
85
CURRENT LIMIT vs. VBTB
(MAX4884)
10
35
TEMPERATURE (°C)
60
85
CURRENT LIMIT vs. VBTB
(MAX4881)
700
1.00
CURRENT LIMIT (A)
600
500
400
300
MAX4881 toc13
1.25
MAX4881 toc12
800
CURRENT LIMIT (mA)
-15
0.75
0.50
200
0.25
VIN = 4.4V
VCB = 5V
100
VIN = 5V
VCB = 5V
0
0
1
2
3
VBTB (V)
4
5
0
0
1
2
3
4
5
VBTB (V)
_______________________________________________________________________________________
5
MAX4881–MAX4884/MAX4893B
Typical Operating Characteristics (continued)
(VIN = 5V, TA = +25°C, unless otherwise noted.)
Overvoltage Protection Controllers with
Current Limit in TDFN
MAX4881–MAX4884/MAX4893B
Pin Description
6
PIN
NAME
FUNCTION
1
IN
Input. IN is the power input for the OVP charge pump. Bypass IN to GND with a 1µF or larger
capacitor.
2
EN
Active-Low Enable Input. Drive EN high to turn off the external MOSFET. Driving EN low activates
the OVP circuitry and turns on the external MOSFET.
3
GATE
4
BTA
Internal Current-Limited Switch Terminal. 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 for proper operation.
5
CB
Active-Low Internal Current-Limited-Switch Control Input. Drive CB high to turn on the internal
switch, pull CB low to turn off the internal switch.
6
GND
Ground
7
BTB
Internal Current-Limited-Switch Output. Bypass BTB to GND with 0.1µF capacitor as close to the
device as possible.
8
FLAGI
Active-Low Open-Drain Internal Current-Limited Flag Output. FLAGI asserts low when the current
is at the limit for longer than the blanking time. FLAGI is disabled when EN goes high.
9
N.C.
10
OV
Active-Low Open-Drain IN-Overvoltage Flag Output. OV goes low when an
undervoltage/overvoltage fault occurs at IN. OV is disabled when EN goes high.
—
EP
Exposed Pad. EP is internally connected to GND. Correct EP to a large ground plane to act as a
heat sink, but do not use EP as the only electrical ground connection.
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.
No Connection. Not internally connected.
_______________________________________________________________________________________
Overvoltage Protection Controllers with
Current Limit in TDFN
MAX4881–MAX4884/MAX4893B
5V
VIN
VUVLO
VIN
tGON
1.2V
VOVLO
0V
8V
tOVP
tSTART
80%
VGATE
0.3V
IGATE
t0V-BLANK
2.4V
VOV
Figure 3. Power-Up Overvoltage Timing Diagram
Figure 1. Startup Timing Diagram
7V/8V
VIN
VOVLO
4V/5V
tOV
VEN
2.4V
tGOFF
tDIS
VGATE
VGATE
0.3V
0.3V
VOV
0.4V
Figure 2. Shutdown Timing Diagram
Detailed Description
The MAX4881–MAX4884/MAX4893B provide up to
+28V overvoltage protection for low-voltage systems.
When the input voltage at IN exceeds the overvoltage
trip level (OVLO), the MAX4881–MAX4884/MAX4893B
turn off the low-cost external n-channel FET to prevent
damage to the protected components and issue an
overvoltage fault flag.
The MAX4881–MAX4884 feature a built-in current-limited
switch that limits the load current to 1.1A (MAX4881/
MAX4882), 0.7A (MAX4883B/MAX4883C/MAX4884B/
MAX4884C), and 0.9A (MAX4893B). When the load current is at the current limit for longer than the blanking
time, the switch of the MAX4881/MAX4882/MAX4883B/
MAX4884B/MAX4893B latches off and does not turn
back on until EN or CB or IN is cycled. A current-limit flag
(FLAGI) asserts to indicate a current fault condition. The
MAX4883C/MAX4884C limit the current to 0.7A indefinitely until the thermal protection trips. An overcurrent flag
output asserts to indicate a current fault condition after
the blanking time has elapsed.
Figure 4. Disable Timing Diagram
IN-Undervoltage Lockout (UVLO)
The MAX4881/MAX4883/MAX4893B have a fixed 4.35V
undervoltage lockout level (UVLO) while the
MAX4882/MAX4884 have a fixed UVLO of 2.55V. GATE
goes low when V IN is below V UVLO , turning off the
external n-channel FET.
IN-Overvoltage Lockout (OVLO)
The MAX4881/MAX4883/MAX4893B have a fixed 5.6V
overvoltage threshold (OVLO), while the MAX4882/
MAX4884 have a fixed OVLO of 4.5V. GATE goes low
when VIN is higher than VOVLO, turning off the external
n-channel FET.
Fault Flag Output (OV)
The OV output signals the host system that there is a fault
with the input voltage. OV asserts low in response to
either an overvoltage or undervoltage fault. OV stays low
for 50ms after GATE turns on, before deasserting high.
OV is an open-drain active-low output. Connect a
pullup resistor from OV to the logic I/O voltage of the
host system or to any voltage source up to 6V. Driving
EN high disables OV.
_______________________________________________________________________________________
7
MAX4881–MAX4884/MAX4893B
Overvoltage Protection Controllers with
Current Limit in TDFN
tBLANK
tBLANK
tBLANK
tBLANK
CURRENT
LIMIT
LOAD
CURRENT
LOAD
CURRENT
ON
SWITCH
STATUS
ON
SWITCH
STATUS
OFF
OFF
EN
STATUS
FLAGI
FLAGI
PIN STATUS
(a) MAX4881/MAX4882/MAX4883B/MAX4884B/MAX4893B
tBLANK
(a)
tBLANK
tBLANK
CURRENT
LIMIT
LOAD
CURRENT
tBLANK
LOAD
CURRENT
ON
ON
SWITCH
STATUS
SWITCH
STATUS
OFF
CB
STATUS
FLAGI
FLAGI
STATUS
(b) MAX4883C/MAX4884C
(b)
Figure 5. Current-Limit Fault Timing
tBLANK
tBLANK
Overcurrent Flag Output (FLAGI)
The MAX4881–MAX4884/MAX4893B have an overcurrent-fault flag output (FLAGI) to indicate a current fault
condition. FLAGI asserts low to indicate a fault when the
current reaches the current limit for longer than the 50ms
blanking time. Toggle IN or CB or EN to release FLAGI
latched condition. FLAGI does not assert if the currentlimit fault occurs for less than the blanking time (Figure 5).
FLAGI is disabled when EN goes high. When CB is low,
the switch opens, but FLAGI is not active.
FLAGI is an open-drain active-low output. Connect a
pullup resistor from FLAGI to the logic I/O voltage of the
host system or to any voltage source up to 6V.
Current-Limit Switch
LOAD
CURRENT
ON
SWITCH
STATUS
IN
STATUS
OFF
UVLO
FLAGI
STATUS
(c)
Figure 6. Latchoff Fault Blanking (MAX4881/MAX4882/
MAX4883B/MAX4884B/MAX4893B
When the forward- or reverse-current-limit threshold is
exceeded, tBLANK timer begins counting. The timer
8
_______________________________________________________________________________________
Overvoltage Protection Controllers with
Current Limit in TDFN
OV
FLAGI
GATE
IN
OVLO
UVLO
CHARGE PUMP
IN
EN
GATE
IN
OVLO
UVLO
CHARGE PUMP
BTA
BTA
OV
BTA
UVLO
1.1A/0.7A
LIMIT
IREF
FLAGI
BTA
UVLO
1.1A/0.7A
LIMIT
IREF
CHARGE
PUMP
CHARGE
PUMP
BTB
BTB
BLANKING TIME
AND LATCHOFF LOGIC
CB
MAX4881/MAX4882
MAX4883B/MAX4884B
MAX4893B
GND
BLANKING TIME
LOGIC
CB
MAX4883C/MAX4884C
GND
Figure 7a. MAX4881/MAX4882/MAX4883B/MAX4884B/
MAX4893B Functional Diagram
Figure 7b. MAX4883C/MAX4884C Functional Diagram
resets if the overcurrent condition disappears before
tBLANK has elapsed. The internal switch is latched off if
the overcurrent condition continues up to the end of the
blanking time (MAX4881/MAX4882/MAX4883B/
MAX4884B/MAX4893B). The MAX4883C/MAX4884C limit
the current infinitely until the thermal trip point occurs.
Reset the switch by toggling EN or CB or IN (Figure 6).
The GATE output voltage, as a function of input voltage, is shown in the Typical Operating Characteristics.
EN Input
The MAX4881–MAX4884/MAX4893B feature an activelow enable input (EN). Drive EN low or connect to
ground for normal operation. Drive EN high to force the
external n-channel MOSFET off, and to disable OV and
FLAGI.
GATE Driver
An on-chip charge pump drives the GATE voltage to
about twice above VIN, allowing the use of a low-cost
n-channel MOSFET (Figure 7). The actual GATE output
voltage tracks approximately 2 x VIN until VIN exceeds
the OVLO trip level, 5.6V (MAX4881/MAX4883/
MAX4893B) and 4.5V (MAX4882/MAX4884) typically.
Applications Information
MOSFET Selection
The MAX4881–MAX4884/MAX4893B are designed for
use with an n-channel MOSFET. MOSFETs with RDS(ON),
specified for a VGS of 4.5V or less, work well. If the input
supply is near the UVLO minimum of 4.2V (MAX4881/
MAX4883/MAX4893B), or of 2.4V (MAX4882/ MAX4884),
consider using a MOSFET specified for a lower VGS voltage. Also, the VDS should be 30V for the MOSFET to
withstand the full 28V IN range of the MAX4881–
MAX4884/MAX4893B. Table 1 shows a selection of
MOSFETs appropriate for use with the MAX4881–
MAX4884/MAX4893B.
IN Bypass Considerations
Bypass IN to GND with a 1µF ceramic capacitor to
achieve 15kV ESD-protected input. When the power
source has significant inductance due to long lead
_______________________________________________________________________________________
9
MAX4881–MAX4884/MAX4893B
IN
EN
Table 1. MOSFET Suggestions
PART
CONFIGURATION/
PACKAGE
VDS
MAX (V)
RON
AT 4.5V (mΩ)
Si1426DH
Single/SC70-6
30
115
Vishay Siliconix
http://www.vishay.com
(402) 563-6866
FDG315N
Single/SC70-6
30
160
Fairchild Semiconductor
http://www.fairchildsemi.com
(207) 775-8100
RC
1MΩ
CHARGE-CURRENTLIMIT RESISTOR
HIGHVOLTAGE
DC
SOURCE
Cs
100pF
MANUFACTURER
RC
50Ω to 100Ω
RD
1.5kΩ
DISCHARGE
RESISTANCE
CHARGE-CURRENTLIMIT RESISTOR
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
HIGHVOLTAGE
DC
SOURCE
Cs
150pF
RD
330Ω
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
STORAGE
CAPACITOR
Figure 10. IEC 61000-4-2 ESD Test Model
Figure 8. Human Body ESD Test Model
I
100%
IP 100%
90%
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
90%
AMPERES
I PEAK
MAX4881–MAX4884/MAX4893B
Overvoltage Protection Controllers with
Current Limit in TDFN
36.8%
10%
0
0
tRL
TIME
tDL
CURRENT WAVEFORM
10%
Figure 9. Human Body Model Current Waveform
t r = 0.7ns to 1ns
length, take care to prevent overshoots due to the LC
tank circuit, and provide protection if necessary to prevent exceeding the 30V absolute maximum rating on IN.
The MAX4881–MAX4884/MAX4893B provide protection
against voltage faults up to 28V, but this does not
include negative voltages. If negative voltages are a
concern, connect a Schottky diode from IN to GND to
clamp negative input voltages.
10
t
30ns
60ns
Figure 11. IEC 61000-4-2 ESD Generator Current
Exposed Pad
The MAX4881–MAX4884/MAX4893B provide an
exposed pad on the bottom of the package. This pad is
internally connected to GND. For the best thermal conductivity and higher power dissipation, solder the
exposed pad to the ground plane. Do not use the
______________________________________________________________________________________
Overvoltage Protection Controllers with
Current Limit in TDFN
AC-DC
ADAPTER
5.25V
IN
VIO
GATE
IN
BTA
VIO
1.1A/0.7A
GATE
BTA
1.1A/0.9A/0.7A
LOAD
BTB
MAX4882/
MAX4884
Li+
MAX4881/
MAX4883/
MAX4893B
BTB
BATTERY
CHARGER
LOAD
Li+
FLAGI
OV
CB
EN
FLAGI
OV
CB
EN
GND
GND
Figure 12. Connection to an AC-DC Adapter without a Built-In
Battery Charger
Figure 13. Connection to an AC-DC Adapter with a Built-In
Battery Charger
ground-connected pad as the only electrical ground
connection or ground return. Use GND (pin 6) as the
only electrical ground connection.
equipment that meets Level 3 of IEC 61000-4-2, without
additional ESD-protection components.
The main difference between tests done using the
Human Body Model and IEC 61000-4-2 is higher peak
current in IEC 61000-4-2. Because series resistance is
lower in the IEC 61000-4-2 ESD test model (Figure 10),
the ESD-withstand voltage measured to this standard is
generally lower than that measured using the Human
Body Model. Figure 11 shows the current waveform for
the ±8kV, IEC 61000-4-2, Level 4, ESD Contact
Discharge test. The Air-Gap test involves approaching
the device with a charger probe. The Contact
Discharge method connects the probe to the device
before the probe is energized.
ESD Test Conditions
ESD performance depends on a number of conditions.
The MAX4881–MAX4884/MAX4893B is specified for
15kV typical ESD resistance on IN when IN is bypassed
to ground with a 1µF low-ESR ceramic capacitor.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body Model
Figure 8 shows the Human Body Model and Figure 9
shows the current waveform it generates when discharged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a
1.5kΩ resistor.
IEC 61000-4-2
Since January 1996, all equipment manufactured
and/or sold in the European community has been
required to meet the stringent IEC 61000-4-2 specification. The IEC 61000-4-2 standard covers ESD testing
and performance of finished equipment; it does not
specifically refer to integrated circuits. The
MAX4881–MAX4884/MAX4893B help users design
Typical Operating Circuits
Figures 12 and 13 depict some typical connections to
the MAX4881–MAX4884/MAX4893B. Figure 12 shows a
battery charger application where the source power is
an 4.4V adapter with a built-in charger, while Figure 13
shows an application where the battery charger is
external.
Chip Information
TRANSISTOR COUNT: 2391
PROCESS: BiCMOS
______________________________________________________________________________________
11
MAX4881–MAX4884/MAX4893B
4.4V ADAPTER
WITH BUILT-IN
CHARGER
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)
6, 8, &10L, DFN THIN.EPS
MAX4881–MAX4884/MAX4893B
Overvoltage Protection Controllers with
Current Limit in TDFN
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
12
______________________________________________________________________________________
H
1
2
Overvoltage Protection Controllers with
Current Limit in TDFN
COMMON DIMENSIONS
PACKAGE VARIATIONS
SYMBOL
MIN.
MAX.
PKG. CODE
N
D2
E2
e
JEDEC SPEC
b
A
0.70
0.80
T633-1
6
1.50–0.10
2.30–0.10
0.95 BSC
MO229 / WEEA
0.40–0.05
1.90 REF
D
2.90
3.10
T633-2
6
1.50–0.10
2.30–0.10
0.95 BSC
MO229 / WEEA
0.40–0.05
1.90 REF
[(N/2)-1] x e
E
2.90
3.10
T833-1
8
1.50–0.10
2.30–0.10
0.65 BSC
MO229 / WEEC
0.30–0.05
1.95 REF
A1
0.00
0.05
T833-2
8
1.50–0.10
2.30–0.10
0.65 BSC
MO229 / WEEC
0.30–0.05
1.95 REF
L
0.20
0.40
T833-3
8
1.50–0.10
2.30–0.10
0.65 BSC
MO229 / WEEC
0.30–0.05
1.95 REF
k
0.25 MIN.
T1033-1
10
1.50–0.10
2.30–0.10
0.50 BSC
MO229 / WEED-3
0.25–0.05
2.00 REF
A2
0.20 REF.
T1033-2
10
1.50–0.10
2.30–0.10
0.50 BSC
MO229 / WEED-3
0.25–0.05
2.00 REF
T1433-1
14
1.70–0.10
2.30–0.10
0.40 BSC
----
0.20–0.05
2.40 REF
T1433-2
14
1.70–0.10
2.30–0.10
0.40 BSC
----
0.20–0.05
2.40 REF
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
-DRAWING NOT TO SCALE-
H
2
2
Revision History
All pages changed at Rev 2.
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 ____________________ 13
© 2006 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
MAX4881–MAX4884/MAX4893B
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information
go to www.maxim-ic.com/packages.)