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.)