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19-3777; Rev 2; 10/06
Overvoltage Protection Controllers with Current Limit in TDFN
General Description
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. 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 -40C to +85C temperature range.
Features
o Overvoltage Protection Up to 28V o Preset Overvoltage Trip Level 5.6V (MAX4881/MAX4883/MAX4893B) 4.5V (MAX4882/MAX4884) o Internal Current-Limited Switch 1.1A (MAX4881/MAX4882) 0.7A (MAX4883/MAX4884) 0.9A (MAX4893B) o Drives Low-Cost n-Channel MOSFET o Internal 50ms Startup Delay o Overvoltage Fault OV Indicator o Current-Limit Fault FLAGI Indicator o Undervoltage Lockout o Thermal Shutdown Protection o Tiny 10-Pin TDFN Package
MAX4881-MAX4884/MAX4893B
Pin Configuration
FLAGI N.C. BTB 7 4 BTA OV
TOP VIEW
10 *EP
9
8
+ 1 IN
MAX4881 MAX4882 MAX4883 MAX4884 MAX4893B
2 EN 3 GATE 5 CB
Applications
Cell Phones Digital Still Cameras PDAs and Palmtop Devices MP3 Players
OV TRIP LEVEL (V) 5.6 4.5 5.6 5.6 4.5 4.5 5.6
3mm x 3mm TDFN
*CONNECT EXPOSED PAD TO GND.
Ordering Information
CURRENT LIMIT (A) 1.1 1.1 0.7 0.7 0.7 0.7 0.9 CURRENT-LIMIT MODE LATCHOFF LATCHOFF LATCHOFF CONTINUOUS LATCHOFF CONTINUOUS LATCHOFF TOP MARK APK APL APM APN APO APP ATF PKG CODE T1033-1 T1033-1 T1033-1 T1033-1 T1033-1 T1033-1 T1033-1
PART MAX4881ETB MAX4882ETB MAX4883BETB MAX4883CETB MAX4884BETB** MAX4884CETB** MAX4893BETB
TEMP RANGE -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C -40C to +85C
PIN-PACKAGE 10 TDFN-EP* 10 TDFN-EP* 10 TDFN-EP* 10 TDFN-EP* 10 TDFN-EP* 10 TDFN-EP* 10 TDFN-EP*
* EP = Exposed pad. **Future product--contact factory for availability. ________________________________________________________________ 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.
GND 6
Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
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 = +70C) 10-Pin TDFN (derate 18.5mW/C above +70C) .....1481.5mW Operating Temperature Range ..........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range ............................-65C to +150C Lead Temperature (soldering, 10s) ................................+300C
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 = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER INPUT VOLTAGE (IN) Input Voltage Range Overvoltage Trip Level Overvoltage-Trip-Level Hysteresis Undervoltage Lockout Threshold Undervoltage Lockout Hysteresis Supply Current INTERNAL SWITCH BTA Input Range BTA Undervoltage Lockout BTA-Undervoltage-Lockout Hysteresis MAX4881/MAX4882, VBTB = GND Switch-Forward Current Limit IFWD MAX4883/MAX4884, VBTB = GND MAX4893B, VBTB = GND MAX4881/MAX4882 Switch-Reverse Current Limit IREV MAX4883/MAX4884 MAX4893B VBTA = 5V (MAX4881/MAX4883/MAX4893B) Voltage Drop (VBTA - VBTB) IL = 400mA VBTA = 4V (MAX4882/MAX4884) 20 VEN = 0, VCB = 0 50 1.00 0.600 0.800 VBTA BTAUVLO VBTA falling 2.8 2.4 50 1.1 0.7 1.25 0.775 1 1.25 0.775 1 110 mV 110 80 1 ms A A A 5.7 2.7 V V mV IIN + IBTA No load, VEN = 0 or 5.5V, VIN = VOVLO (MIN) - 0.1V, VCB = VIN UVLO VIN falling MAX4881/MAX4883/MAX4893B MAX4882/MAX4884 4.2 2.4 VIN OVLO VIN rising MAX4881/MAX4883/MAX4893B MAX4882/MAX4884 1.2 5.5 4.4 5.6 4.5 50 4.35 2.55 50 240 380 4.5 2.7 28.0 5.7 4.6 V V mV V mV A SYMBOL CONDITIONS MIN TYP MAX UNITS
Blanking Time BTB Off Current
tBLANK IBTB-OFF
2
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Overvoltage Protection Controllers with Current Limit in TDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +5V (MAX4881/MAX4883/MAX4893B), VIN = +4V (MAX4882/MAX4884), TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER GATE IGATE sourcing 1A VIN = 5V (MAX4881/MAX4883/MAX4893B) VIN = 4.3V (MAX4882/MAX4884) 9 7.6 60 20 20 50 50 7 6 20 s VIN increasing from 4V to 7V at 3V/s, VGATE = 0.3V, CGATE = 1500pF (Figure 2) (MAX4882/MAX4884) VIN increasing from 5V to 8V at 3V/s, VOV = 0.4V (Figure 2) (MAX4881/MAX4883/MAX4893B) VIN increasing from 4V to 7V at 3V/s, VOV = 0.4V (Figure 2) (MAX4882/MAX4884) Initial Overvoltage Fault Delay Disable Time EN, CB INPUTS Input-High Voltage Input-Low Voltage Input Leakage OV, FLAGI OUTPUTS Output Voltage Low Leakage Current THERMAL PROTECTION Thermal Shutdown Thermal Hysteresis 150 40 C C VOL ISINK = 1mA, OV, FLAGI assert VFLAGI = VOV = 5.5V 0.4 1 V A VIH VIL 1.4 0.5 1 V V A tOVP tDIS VIN increasing from 0 to 8V, IGATE = 80% of IPD (Figure 3) VEN = 2.4V, VGATE = 0.3V (Figure 4) 6 20 80 80 10 V 8.6 mA ms ms ms SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX4881-MAX4884/MAX4893B
GATE Voltage
VGATE
GATE Pulldown Current TIMING Startup Delay OV Blanking Time GATE Turn-On Time
IPD tSTART tOV-BLANK tGON
VIN > VOVLO, VGATE = 5.5V VIN > VUVLO, VGATE > 0.3V (Figure 1) VGATE = 0.3V, VOV = 2.4V (Figure 1) VGATE = 0.3V to 7V, CGATE = 1500pF (Figure 1) VIN increasing from 5V to 8V at 3V/s, VGATE = 0.3V, CGATE = 1500pF (Figure 2) (MAX4881/MAX4883/MAX4893B)
GATE Turn-Off Time
tGOFF
5.8 s 5.8 100 580 ns ns
OV Assertion Delay
tOV
Note 1: All devices are 100% tested at TA = +25C. Electrical limits over the full temperature range are guaranteed by design.
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3
Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
Typical Operating Characteristics
(VIN = 5V, TA = +25C, unless otherwise noted.)
IIN + IBTA CURRENT vs. INPUT VOLTAGE
MAX4881 toc01
IIN + IBTA CURRENT vs. TEMPERATURE
MAX4881 toc02
GATE VOLTAGE vs. INPUT VOLTAGE (MAX4884)
OVLO TRIP POINT 9 GATE VOLTAGE (V)
MAX4881 toc03
400 350 IIN + IBTA CURRENT (A) 300 250 200 150 100 50 0 0 5 10 15 20 INPUT VOLTAGE (V) 25 UVLO TRIP POINT VEN = 0 VCB = 5V OVLO TRIP POINT
400 350 IIN + IBTA CURRENT (A) 300 250 200 150 100 50 0
12
UVLO TRIP POINT
6
3
0 -40 -15 10 35 TEMPERATURE (C) 60 85 0 1 2 3 4 5 6 INPUT VOLTAGE (V) 7 8
30
GATE VOLTAGE vs. INPUT VOLTAGE (MAX4881)
MAX4881 toc04
BTB OFF CURRENT vs. TEMPERATURE
VEN = 0 VCB = 0 VBTB = 5.5V
MAX4881 toc05
POWER-UP RESPONSE (MAX4884)
MAX4881 toc06
12 OVLO TRIP POINT UVLO TRIP POINT 9 GATE VOLTAGE (V)
1000
100 BTB OFF CURRENT (nA)
IN GATE
5V 10V 0 5V
10 1 BTA 0 5V 0.1 OV 0
6
3
0 0 1 2 3 4 5 6 INPUT VOLTAGE (V) 7 8
0.01 -40 -15 10 35 TEMPERATURE (C) 60 85
20ms/div
POWER-DOWN RESPONSE (MAX4884)
MAX4881 toc07
EN vs. GATE (MAX4884)
MAX4881 toc08
OVERVOLTAGE RESPONSE (MAX4884)
MAX4881 toc09
IN 10V GATE 0 BTA
5V EN 0
5V 0
IN
6V 3V
5V 0 5V OV 0 20ms/div 100s/div GATE
10V
GATE
0 5V
0
OV 20mA IGATE
0
400ns/div
4
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Overvoltage Protection Controllers with Current Limit in TDFN
Typical Operating Characteristics (continued)
(VIN = 5V, TA = +25C, unless otherwise noted.)
MAX4881-MAX4884/MAX4893B
CURRENT LIMIT vs. TEMPERATURE (MAX4884)
700 600 CURRENT LIMIT (mA) 500 400 300 200 100 0 -40 -15 10 35 TEMPERATURE (C) 60 85 VIN = 4.4V VBTB = 2.7V VCB = 5V CURRENT LIMIT (A) 0.75
MAX4881 toc10
CURRENT LIMIT vs. TEMPERATURE (MAX4881)
MAX4881 toc11
800
1.25
1.00
0.50 VIN = 5V VBTB = 2.7V VCB = 5V -40 -15 10 35 TEMPERATURE (C) 60 85
0.25
0
CURRENT LIMIT vs. VBTB (MAX4884)
MAX4881 toc12
CURRENT LIMIT vs. VBTB (MAX4881)
MAX4881 toc13
800 700 600 CURRENT LIMIT (mA) 500 400 300 200 100 0 0 1 2 VBTB (V) 3 4 5 VIN = 4.4V VCB = 5V
1.25
1.00 CURRENT LIMIT (A)
0.75
0.50
0.25 VIN = 5V VCB = 5V 0 0 1 2 VBTB (V) 3 4 5
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5
Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
Pin Description
PIN 1 2 3 NAME IN EN GATE FUNCTION Input. IN is the power input for the OVP charge pump. Bypass IN to GND with a 1F or larger capacitor. 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. 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. 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 0.1F capacitor as close to the device as possible for proper operation. 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. Ground Internal Current-Limited-Switch Output. Bypass BTB to GND with 0.1F capacitor as close to the device as possible. 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. No Connection. Not internally connected. 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. 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.
4
BTA
5 6 7 8 9 10 --
CB GND BTB FLAGI N.C. OV EP
6
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Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
5V VIN 1.2V VUVLO tGON 8V tSTART VGATE 0.3V t0V-BLANK VOV 2.4V IGATE VIN 0V tOVP 80% VOVLO
Figure 1. Startup Timing Diagram
Figure 3. Power-Up Overvoltage Timing Diagram
7V/8V VIN 4V/5V
VOVLO tOV tGOFF tDIS VEN 2.4V
VGATE 0.3V
VGATE 0.3V
VOV 0.4V
Figure 2. Shutdown Timing Diagram
Figure 4. Disable 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.
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
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Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
tBLANK tBLANK tBLANK CURRENT LIMIT LOAD CURRENT ON SWITCH STATUS OFF EN STATUS LOAD CURRENT ON SWITCH STATUS OFF tBLANK
FLAGI FLAGI PIN STATUS (a) MAX4881/MAX4882/MAX4883B/MAX4884B/MAX4893B tBLANK CURRENT LIMIT LOAD CURRENT ON SWITCH STATUS SWITCH STATUS OFF CB STATUS FLAGI FLAGI STATUS (b) (a) tBLANK
tBLANK
tBLANK LOAD CURRENT ON
(b) MAX4883C/MAX4884C
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.
LOAD CURRENT ON SWITCH STATUS
OFF UVLO
IN STATUS FLAGI STATUS
(c)
Current-Limit Switch
When the forward- or reverse-current-limit threshold is exceeded, tBLANK timer begins counting. The timer
8
Figure 6. Latchoff Fault Blanking (MAX4881/MAX4882/ MAX4883B/MAX4884B/MAX4893B
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Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
EN GATE EN GATE
IN
IN OVLO UVLO
CHARGE PUMP BTA
IN
IN OVLO UVLO
CHARGE PUMP BTA
OV
1.1A/0.7A LIMIT
BTA UVLO
OV
1.1A/0.7A LIMIT
BTA UVLO
FLAGI
IREF CHARGE PUMP BTB BLANKING TIME AND LATCHOFF LOGIC CB
FLAGI
IREF CHARGE PUMP BTB BLANKING TIME LOGIC CB
MAX4881/MAX4882 MAX4883B/MAX4884B MAX4893B GND
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.
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.
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.
IN Bypass Considerations
Bypass IN to GND with a 1F ceramic capacitor to achieve 15kV ESD-protected input. When the power source has significant inductance due to long lead
9
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Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
Table 1. MOSFET Suggestions
PART CONFIGURATION/ PACKAGE Single/SC70-6 VDS MAX (V) 30 RON AT 4.5V (m) 115 MANUFACTURER Vishay Siliconix http://www.vishay.com (402) 563-6866 Fairchild Semiconductor http://www.fairchildsemi.com (207) 775-8100
Si1426DH
FDG315N
Single/SC70-6
30
160
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE
RD 1.5k DISCHARGE RESISTANCE DEVICE UNDER TEST HIGHVOLTAGE DC SOURCE
RC 50 to 100 CHARGE-CURRENTLIMIT RESISTOR
RD 330 DISCHARGE RESISTANCE DEVICE UNDER TEST
Cs 100pF
STORAGE CAPACITOR
Cs 150pF
STORAGE CAPACITOR
Figure 8. Human Body ESD Test Model
Figure 10. IEC 61000-4-2 ESD Test Model
I 100%
IP 100% 90% AMPERES 36.8% 10% 0 0 tRL TIME
Ir
PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
90%
tDL CURRENT WAVEFORM
I PEAK
10% t r = 0.7ns to 1ns t 30ns 60ns
Figure 9. Human Body Model Current Waveform
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.
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
10
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Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
4.4V ADAPTER WITH BUILT-IN CHARGER AC-DC ADAPTER 5.25V
IN VIO
GATE
BTA VIO
IN
GATE
BTA
1.1A/0.7A
1.1A/0.9A/0.7A
LOAD BTB
MAX4882/ MAX4884
Li+ FLAGI OV CB EN GND
MAX4881/ MAX4883/ MAX4893B
FLAGI OV CB EN GND
BTB
BATTERY CHARGER
LOAD
Li+
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.
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 1F 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 1.5k resistor.
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.
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.
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
Chip Information
TRANSISTOR COUNT: 2391 PROCESS: BiCMOS
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11
Overvoltage Protection Controllers with Current Limit in TDFN MAX4881-MAX4884/MAX4893B
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
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
21-0137
H
1 2
12
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Overvoltage Protection Controllers with Current Limit in TDFN
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.)
MAX4881-MAX4884/MAX4893B
COMMON DIMENSIONS SYMBOL A D E A1 L k A2 MIN. 0.70 2.90 2.90 0.00 0.20 MAX. 0.80 3.10 3.10 0.05 0.40
PACKAGE VARIATIONS PKG. CODE T633-1 T633-2 T833-1 T833-2 T833-3 T1033-1 T1033-2 T1433-1 T1433-2 N 6 6 8 8 8 10 10 14 14 D2 1.50-0.10 1.50-0.10 1.50-0.10 1.50-0.10 1.50-0.10 1.50-0.10 1.50-0.10 1.70-0.10 1.70-0.10 E2 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 2.30-0.10 e 0.95 BSC 0.95 BSC 0.65 BSC 0.65 BSC 0.65 BSC 0.50 BSC 0.50 BSC 0.40 BSC 0.40 BSC JEDEC SPEC MO229 / WEEA MO229 / WEEA MO229 / WEEC MO229 / WEEC MO229 / WEEC MO229 / WEED-3 MO229 / WEED-3 ------b 0.40-0.05 0.40-0.05 0.30-0.05 0.30-0.05 0.30-0.05 0.25-0.05 0.25-0.05 0.20-0.05 0.20-0.05 [(N/2)-1] x e 1.90 REF 1.90 REF 1.95 REF 1.95 REF 1.95 REF 2.00 REF 2.00 REF 2.40 REF 2.40 REF
0.25 MIN. 0.20 REF.
PACKAGE OUTLINE, 6,8,10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm
-DRAWING NOT TO SCALE-
21-0137
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 (c) 2006 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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