19-3374; Rev 0; 7/04 500mA LDO Linear Regulators with Current-Limiting Switch The MAX4836/MAX4837 family of low-dropout (LDO) linear regulators feature an accurate current-limiting switch with an integrated FLAG or RESET function. These devices operate from 2.5V to 5.5V and deliver up to 500mA of load current at a preset output voltage. Preset output voltage levels are 1.8V/2.5V/2.8V/3.0V/3.3V. The MAX4836/MAX4837 offer a programmable softstart control function to eliminate false reset during startup. The MAX4836 provides a FLAG function to notify the system when the load current exceeds the limit. The MAX4837 provides a RESET function to notify the system when the output drops below the threshold. Additionally, reverse-current protection prevents current flowing from the output to the input. Other features include a low 90µA quiescent current, a 0.1µA shutdown current. The MAX4836/MAX4837 are available in space-saving 6-pin SOT23 and TDFN packages. Each device is specified over the -40°C to +85°C extended temperature range. Contact factory for other programmed output voltage versions from 1.5V to 3.3V in 100mV increments. For pin-compatible 100mA versions of this device, refer to the MAX4832/MAX4833. For pin-compatible 250mA versions of this device, refer to the MAX4834/MAX4835. Applications SDIO Ports and Devices Notebook Computers USB Ports and Devices Cell Phones PDAs and Palmtop Devices GPS Systems Pin Configurations TOP VIEW IN 1 GND 2 SHDN 3 MAX4836/MAX4837 EXPOSED PADDLE 6 OUT 5 SS 4 RESET (FLAG) Features ♦ Guaranteed Minimum 500mA Load Current ♦ Accurate Current Limit ♦ Preset Output Voltages: 1.8V/2.5V/2.8V/3.0V/3.3V ♦ 2.5V to 5.5V Supply Voltage Range ♦ Adjustable Soft-Start ♦ Low Dropout Voltage ♦ Thermal Shutdown ♦ Reverse-Current Protection ♦ Shutdown Output Discharge (MAX4837) ♦ Low 90µA Supply Current ♦ Ultra-Low 0.1µA Shutdown Current ♦ FLAG and Latch Off (MAX4836) or RESET (MAX4837) ♦ Tiny SOT23 and TDFN (3mm x 3mm) Packages Ordering Information PART TEMP RANGE PIN-PACKAGE MAX4836EUTxy_-T* -40°C to +85°C 6 SOT23-6 MAX4836ETTxy_-T -40°C to +85°C 6 TDFN-6 MAX4837EUTxy_dd-T* -40°C to +85°C 6 SOT23-6 MAX4837ETTxy_dd-T -40°C to +85°C 6 TDFN-6 Note: “xy” are placeholders for the output voltage levels of the devices. Insert the values found in Table 1 at the end of this document in the place of “xy”. The “_” is a placeholder for either the RESET or the FLAG feature. Insert “B” in the place of “_” for RESET and “C” for FLAG. “dd” is a placeholder for the reset timeout period. Insert the values found in Table 2 in the place of “dd.” For example, MAX4837EUT18BD2 has a 1.8V output voltage, RESET feature, and a 30ms reset timeout period. Note that “dd” applies only to the devices with RESET option and does not apply to the devices with FLAG option. For devices with the FLAG option, leave dd blank. Standard versions require a minimum order increment of 2.5k units. Nonstandard versions must be ordered in 10k unit increments. Contact factory for availability. *Future product—contact factory for availability. Tables 1 and 2 and Selector Guide appear at end of data sheet. TDFN ( ) MAX4836ETTxyC ONLY. Pin Configurations continued at end of data sheet. ________________________________________________________________ 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 MAX4836/MAX4837 General Description MAX4836/MAX4837 500mA LDO Linear Regulators with Current-Limiting Switch ABSOLUTE MAXIMUM RATINGS IN, SHDN, FLAG, OUT to GND ................................-0.3V to +6V RESET to GND .........................................-0.3V to (VOUT + 0.3V) SS to GND ...................................................-0.3V to (VIN + 0.3V) IN to OUT ...............................................................................±6V OUT Short Circuit to GND ..........................................Continuous All Pins ESD Handling (Human Body Model).........................2kV Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 9.1mW/°C above +70°C)................727mW 6-Pin TDFN (derate 24.4mW/°C above +70°C) ..........1951.2mW Operating Temperature Range ...........................-40°C to +85°C Operating Junction Temperature Range ...........-40°C to +125°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 = VOUT + 1V, SHDN = IN, COUT = 3.3µF, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Operating Voltage Input Undervoltage Lockout Threshold SYMBOL CONDITIONS VIN VUVLO VIN rising MIN MAX UNITS 2.5 5.5 V 2.00 2.25 V Input Undervoltage Lockout Threshold Hysteresis Quiescent Current 50 IQ Dropout Voltage (Note 2) SHDN = IN, IOUT = 0 90 SHDN = IN, IOUT = 0, VUVLO < VIN < VOUT (nominal) 150 SHDN = GND, IOUT = 0 0.1 IOUT = 500mA TA = +25°C IOUT = 1mA to 500mA, TA = -40°C to +85°C IOUT VOUT = 0V Reverse Current at VIN VOUT = 5.5V, VIN = 0V to VOUT 150 µA 2 300 330 -1.3 +1.3 -2 +2 CSS = 0.01µF CSS = 0.1µF mV %VNOM mA 540 CSS = not connected tSS mV 500 Output Current Limit Soft-Start Time (Note 3) 200 TA = -40°C to +85°C IOUT = 1mA to 500mA, TA = +25°C Output Voltage Accuracy Output Current TYP 660 mA µA 0.1 2 0.5 1 2.0 4 10 15 40 100 TA = +25°C -0.04 +0.02 TA = -40°C to +85°C -0.05 +0.03 ms 150 +0.065 %VNOM/ V +0.08 Line Regulation (Note 4) VOUT + 0.5V < VIN < 5.5V, ILOAD = 100µA Load Regulation 100µA < ILOAD < 500mA, VIN = VOUT + 1V 1.3 %VNOM Output Noise 10Hz to 100kHz, CSS = 0.01µF 70 µVRMS SHDN = GND 900 Ω SHUTDOWN INPUT (SHDN) OUT Discharge Resistance in Shutdown (MAX4837) SHDN Input-Voltage High VIH SHDN Input-Voltage Low VIL 1.4 0.5 SHDN Input Hysteresis SHDN Input Leakage Current 2 V 30 SHDN = IN or GND -100 _______________________________________________________________________________________ V mV +100 nA 500mA LDO Linear Regulators with Current-Limiting Switch (VIN = VOUT + 1V, SHDN = IN, COUT = 3.3µF, 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 0.85 x VOUT 0.875 x VOUT 0.90 x VOUT V RESET OUTPUT (MAX4837) RESET Threshold VRESET OUT Drop to RESET Delay (Note 5) RESET Timeout Period tOR tRESET RESET Output-Voltage Low 35 D1 timing option 2.5 3.75 5.0 D2 timing option 20 30 40 D3 timing option 150 225 300 D4 timing option 1200 1800 2400 VOUT ≥ 1.0V, ISINK = 50µA, RESET asserted 0.3 VOUT ≥ 1.5V, ISINK = 3.2mA, RESET asserted 0.4 VOUT ≥ 2.0V, ISOURCE ≤ 500µA, RESET deasserted RESET Output-Voltage High µs 0.8 x VOUT ms V V FLAG OUTPUT (MAX4836) Blanking Time (Note 6) tBLANK VOUT + 1V ≤ VIN ≤ 5.5V, OUT = GND 5 10 17 ms 0.4 V 1 µA Open-Drain FLAG OutputVoltage Low ISINK = 3.2mA, FLAG asserted, VOUT ≥ 1.5V Open-Drain FLAG Leakage Current VFLAG = 5.5V 0.01 Junction temperature rising +165 °C 15 °C THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis Note 1: Parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation over the specified temperature range. Note 2: The dropout voltage is measured from VIN to VOUT when VOUT is 2% below its nominal value. The nominal output voltage is measured from VOUT to GND when VIN is 1V greater than VOUT. Defined only for VOUT ≥ 2.5V. Note 3: Soft-start time is defined as the time required for the output to rise from 10% of its nominal value to 90% of its nominal value. Note 4: For VOUT < 2V, VIN must be above 2.5V. Note 5: This is the maximum time OUT can be out of tolerance before a reset is issued. It is implemented to ensure that momentary output glitches do not trigger a reset condition. Note 6: In startup mode, the blanking time counter is not started until the soft-start time has elapsed. The total time from startup to FLAG issued is tSS + tBLANK. _______________________________________________________________________________________ 3 MAX4836/MAX4837 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VIN = VOUT + 1V, SHDN = IN, COUT = 3.3µF, TA = +25°C, unless otherwise noted.) TA = +85°C 100 TA = +85°C 700 TA = +25°C IQ (µA) IQ (µA) 500 60 TA = -40°C TA = +25°C TA = -40°C 400 300 40 75 PULSE DURATION (µs) 600 80 90 MAX4836 toc02 800 MAX4836 toc01 120 MAXIMUM TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE QUIESCENT CURRENT vs. INPUT VOLTAGE (500mA LOAD) RESET ASSERTS ABOVE THIS LINE MAX4836 toc03 QUIESCENT CURRENT vs. INPUT VOLTAGE (NO LOAD) 60 45 30 200 15 100 VOUT = 1.5V VOUT = 3.3V 0 0 0 1 2 3 4 5 6 0 1 2 3 4 5 VIN = 3.5V VOUT = 2.5V 0 1 6 VIN (V) RESET THRESHOLD OVERDRIVE (mV) DROPOUT VOLTAGE vs. LOAD CURRENT POWER-SUPPLY REJECTION RATIO vs. FREQUENCY REGION OF STABLE COUT ESR vs. LOAD CURRENT VOUT = 3.3V 150 VOUT = 2V COUT = 3.3µF ILOAD = 20mA -10 -20 90 30 -30 -40 0 100 200 300 -70 1 0 0.1 1 100 0 50 100 150 200 250 300 350 400 450 500 MAX4836 toc08 MAX4836 toc07 50 LOAD CURRENT (mA) SOFT-START RESPONSE (CSS = FLOATING) OUTPUT NOISE vs. FREQUENCY OUTPUT NOISE (µVRMS) 10 FREQUENCY (kHz) LOAD CURRENT (mA) VIN = 3V VOUT = 1.8V CSS = 10nF ILOAD = 0 40 STABLE REGION 3 2 0.01 500 400 4 -60 -80 0 COUT = 3.3µF 5 -50 60 VOUT = 1.8V 6 COUT ESR (Ω) PSRR (dB) 120 7 MAX4836 toc05 0 MAX4836 toc04 180 VIN 2V/div 30 20 tSS VOUT 2V/div 10 VSS 1V/div 0 10 100 1k 10k 100k 2ms/div FREQUENCY (Hz) 4 100 10 VIN (V) MAX4836 toc06 20 DROPOUT VOLTAGE (mV) MAX4836/MAX4837 500mA LDO Linear Regulators with Current-Limiting Switch _______________________________________________________________________________________ 500mA LDO Linear Regulators with Current-Limiting Switch (VIN = VOUT + 1V, SHDN = IN, COUT = 3.3µF, TA = +25°C, unless otherwise noted.) SOFT-START RESPONSE (CSS = 0.01µF) SOFT-START RESPONSE (CSS = 0.1µF) MAX4836 toc09 LOAD-TRANSIENT RESPONSE VIN = 4.3V VOUT = 3.3V CIN = 0.1µF COUT = 3.3µF ILOAD: STEP FROM 10mA TO 100mA BACK TO 10mA VIN 2V/div VIN 2V/div tSS VSS 1V/div VSS 1V/div 100µs/div 20ms/div 2ms/div LOAD-TRANSIENT RESPONSE NEAR DROPOUT LINE-TRANSIENT RESPONSE RESET RESPONSE TO VIN MAX4836 toc13 MAX4836 toc12 VIN = 3.4V VOUT = 3.3V CIN = 0.1µF COUT = 3.3µF ILOAD: STEP FROM 10mA TO 100mA BACK TO 10mA VOUT 50mV/div AC-COUPLED VOUT 2V/div VOUT 2V/div tSS MAX4836 toc11 MAX4836 toc10 MAX4836 toc14 CSS = FLOATING VOUT 50mV/div AC-COUPLED CIN = 0.1µF COUT = 3.3µF VOUT = 3.3V ILOAD = 10mA 5V VIN 500mV/div 4.5V VIN 2V/div VOUT 50mV/div AC-COUPLED VOUT 2V/div tRESET 100µs/div 100µs/div VRESET 2V/div 40ms/div RESET RESPONSE TO SHUTDOWN RESET RESPONSE TO VOUT MAX4836 toc15 MAX4836 toc16 VIN = 3.5V, CSS = FLOATING VIN = 3.5V, CSS = FLOATING VSHDN 2V/div VOUT 1V/div VOUT 2V/div tRESET 40ms/div VRESET 1V/div tRESET VRESET 2V/div 40ms/div _______________________________________________________________________________________ 5 MAX4836/MAX4837 Typical Operating Characteristics (continued) Typical Operating Characteristics (continued) (VIN = VOUT + 1V, SHDN = IN, COUT = 3.3µF, TA = +25°C, unless otherwise noted.) FLAG RESPONSE WHEN OUT IS SHORTED TO GND > BLANKING TIME (IN IS TOGGLED) FLAG RESPONSE WHEN OUT IS SHORTED TO GND < BLANKING TIME MAX4836 toc17 FLAG RESPONSE WHEN OUT IS SHORTED TO GND > BLANKING TIME (SHDN IS TOGGLED) MAX4836 toc18 VOUT 2V/div MAX4836 toc19 VOUT 1V/div tBLANK VOUT 1V/div VFLAG 2V/div IOUT 200mA/div VFLAG 2V/div tBLANK VIN 2V/div VFLAG 5V/div VSHDN 2V/div FLAG CONNECTED TO LOGIC SUPPLY FLAG CONNECTED TO LOGIC SUPPLY 1ms/div 10ms/div 10ms/div STARTUP IN AN OVERLOAD CONDITION (CSS NOT CONNECTED) STARTUP IN AN OVERLOAD CONDITION (CSS = 0.01µF) NORMALIZED OUTPUT VOLTAGE vs. TEMPERATURE MAX4836 toc21 VIN 2V/div tSS tBLANK 2ms/div VOUT = 2.5V ILOAD = ILIMIT MAXIMUM FLAG CONNECTED TO LOGIC SUPPLY 6 VOUT 2V/div 1.004 VIN 2V/div tSS tBLANK VOUT 2V/div VFLAG 2V/div VFLAG 2V/div VSS 1V/div VSS 1V/div 4ms/div VOUT = 2.5V ILOAD = ILIMIT MAXIMUM FLAG CONNECTED TO LOGIC SUPPLY MAX4836 toc22 MAX4836 toc20 NORMALIZED TO +25°C NORMALIZED OUTPUT VOLTAGE MAX4836/MAX4837 500mA LDO Linear Regulators with Current-Limiting Switch 1.002 ILOAD = 500mA 1.000 ILOAD = 100mA 0.998 ILOAD = 300mA 0.996 0.994 -40 -15 10 35 TEMPERATURE (°C) _______________________________________________________________________________________ 60 85 500mA LDO Linear Regulators with Current-Limiting Switch PIN NAME FUNCTION SOT23 TDFN 1 1 IN 2 2 GND Ground SHDN Active-Low Shutdown Input. Drive SHDN low to shutdown the regulator. Drive SHDN high or connect to IN for normal operation. 3 3 Regulator Power Input. Bypass IN to GND with a 0.1µF ceramic capacitor. Install the bypass capacitor as close to the device as possible. Overcurrent Flag. Open-drain FLAG goes low when the device senses sustained current FLAG exceeding the current-limit threshold for a duration longer than the blanking time. FLAG is high (MAX4836) when SHDN is low or the device is in thermal shutdown. 4 4 5 5 SS Soft-Start Control. Connect a capacitor, CSS, from SS to GND to program the output rise time at startup. No capacitor from SS to GND gives 1ms output rise time at startup. See the soft-start response time plots in the Typical Operating Characteristics. 6 6 OUT Regulator Output. Bypass OUT to GND with a 3.3µF or larger ceramic capacitor. The capacitor’s ESR should be less than 0.2Ω for stable operation. — EP EP Exposed Pad. EP is internally connected to GND. Externally connect EP to GND to provide a low thermal resistance path from the IC junction to the PC board. Active-Low Reset Output. Push-pull RESET goes low when the voltage at OUT is below the reset RESET threshold or when the voltage at OUT is greater than IN. RESET is low when SHDN is low or the (MAX4837) device is in thermal shutdown. After the reset condition terminates, RESET remains low for the duration of the reset timeout period. Detailed Description The MAX4836/MAX4837 are ultra-low quiescent current, low-dropout linear regulators with an integrated current limiter. These devices guarantee up to 500mA drive capabilities and regulate the preset output voltage. The MAX4836 has a flag output that asserts low when the load current exceeds the current limit for more than the blanking time (tBLANK). The MAX4837 has a reset output that asserts low when the regulator output voltage is below the reset threshold voltage (V RESET ). VRESET is 87.5% of the nominal output voltage. Figure 1 shows the simplified functional diagram and Figure 2 shows the typical application circuits. FLAG Output (MAX4836) The open-drain FLAG output goes low and the LDO’s pass transistor is latched off when the current in the pass transistor is at its output current limit for more than the blanking time (tBLANK). Cycling IN or SHDN (high to low to high) brings the device out of its latched-off state and back into normal operation. RESET Output (MAX4837) The RESET output asserts when one of the following conditions occurs: • The input voltage (VIN) is below the input undervoltage lockout threshold (VUVLO). • The output voltage (VOUT) is below the reset threshold (VRESET). • SHDN is pulled low. • The device is in thermal shutdown. • When VOUT > VIN. RESET remains low for the reset timeout period (tRESET) after reset conditions are terminated. There are four RESET timeout periods available as shown in the Electrical Characteristics table. RESET is available in a push-pull configuration as shown in the Selector Guide. Shutdown Pull SHDN low to shut down the LDO and reduce the quiescent current consumption of the device from 90µA to 0.1µA. In shutdown mode, the pass transistor, control circuit, and reference circuit are turned off. Connect SHDN to a supply voltage greater than VIH to turn on the LDO. _______________________________________________________________________________________ 7 MAX4836/MAX4837 Pin Description MAX4836/MAX4837 500mA LDO Linear Regulators with Current-Limiting Switch THERMAL PROTECTION REVERSECURRENT PROTECTION IN MAX4836/MAX4837 PASS TRANSISTOR OUT ERROR AMPLIFIER VSS MAX4837 ONLY 900Ω vFB SWITCH CLOSED IN SHUTDOWN OVERLOAD PROTECTION VREF 1.23V SHDN VREF SWITCH OPEN DURING SOFT-START VREF RESET (FLAG) VFB RESET TIMEOUT VSS = VREF WHEN SOFT-START IS COMPLETE 90% x VREF 1.23µA VSS SS (BLANKING PERIOD) 1nF GND ( ) MAX4836E_ _xyC ONLY. Figure 1. Functional Diagram IN 2.5V TO 5.5V CIN 0.1µF OUT IN COUT 3.3µF VLOGIC 2.5V TO 5.5V LOAD COUT 3.3µF MAX4836 TO µC MAX4837 TO µC SS FLAG OUT CIN 0.1µF SS RESET CSS CSS ON ON SHDN OFF SHDN GND OFF GND Figure 2. Typical Application Circuits 8 _______________________________________________________________________________________ LOAD 500mA LDO Linear Regulators with Current-Limiting Switch Reverse OUT to IN Current When the output voltage is greater than the input voltage, the internal pass transistor turns off. To avoid reverse-charging the input source, the current at IN is guaranteed to be below 3µA when VOUT ≥ VIN. Current Limit The MAX4836/MAX4837 include an accurate internal current-limiting circuit. OUT can be shorted to ground indefinitely without damaging the part. The MAX4836 latches off if the load current exceeds the current limit for more than the blanking time (see the FLAG Output section). During soft-start, the device does not latch off to an overload condition. During an overload condition, the MAX4837 holds the current at current limit until the thermal limit is reached. Once the junction temperature reaches +165°C, thermal shutdown occurs. Thermal Shutdown When the junction temperature (TJ) exceeds +165°C, the LDO’s pass transistor turns off allowing the junction to cool. The LDO’s pass transistor turns on again after the IC’s junction temperature cools by 15°C, resulting in a pulsed output during continuous thermal-overload conditions. Soft-Start During power-up, the soft-start ensures that the output ramps up slowly reducing inrush current peaks. See the soft-start response time plots in the Typical Operating Characteristics. The soft-start time (tSS) is given by the following equation: tSS = CSS (ms) where CSS is in nF. A soft-start capacitor (CSS) of 10nF gives a 10ms tSS. A 1ms minimum soft-start time is fixed internally to ensure that the output rises slowly even without any external capacitor at SS pin to ground. The device is in soft-start mode when either the voltage at IN or SHDN is cycled high to low to high. Applications Information Capacitor Selection and Regulator Stability For stable operation over the full temperature range and with load currents up to 500mA, use a 3.3µF (min) ceramic output capacitor with an ESR <0.2Ω. To reduce noise and improve load transient response, stability, and power-supply rejection, use larger output capacitor values such as 10µF (note that some ceramic capacitors exhibit large capacitance and ESR variation with temperature). X7R capacitors provide good performance over the -40°C to +85°C operating temperature range. To improve power-supply rejection and transient response, use a 0.1µF capacitor between IN and GND. The MAX4836/MAX4837 remain stable with purely resistive loads or current loads up to 500mA. 15kV Operational ESD Protection A 3.3µF or higher value ceramic capacitor from OUT to GND provides a 15kV (Human Body Model) protection at OUT. The ESR value of the capacitor should be less than 0.2Ω. Reset Transient Immunity The reset circuit is relatively immune to short duration, falling V OUT transients. The Typical Operating Characteristics show a graph of the Maximum Transient Duration vs. Reset Threshold Overdrive for which reset is not asserted. The graph was produced using falling VOUT transients starting at VOUT and ending below the reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse width that a falling VOUT transient can typically have without triggering the reset pulse. As the amplitude of the transient increases (i.e., goes further below the reset threshold), the maximum allowable pulse width decreases. Typically, a VOUT transient that goes only 10mV below the reset threshold and lasts up to 54µs does not trigger a reset pulse. Layout When using the TDFN package, connect its exposed paddle to GND to provide a low thermal resistance path for heat transfer from the IC junction to the printed circuit board. _______________________________________________________________________________________ 9 MAX4836/MAX4837 Shutdown Discharge (MAX4837) OUT discharges through a 900Ω internal resistor during shutdown mode. MAX4836/MAX4837 500mA LDO Linear Regulators with Current-Limiting Switch Selector Guide PART PINPACKAGE OUTPUT CURRENT (mA) RESET OUTPUT CONFIGURATION RESET (FLAG) SHUTDOWN DISCHARGE LATCH OFF MAX4836EUTxyC-T 6 SOT23-6 500 Open-Drain FLAG No Yes MAX4836ETTxyC-T 6 TDFN-6 500 Open-Drain FLAG No Yes MAX4837EUTxyBdd-T 6 SOT23-6 500 Push-Pull RESET Yes No MAX4837ETTxyBdd-T 6 TDFN-6 500 Push-Pull RESET Yes No Suffix ‘xy’ in the part number stands for nominal output voltage. 1.8V, 2.5V, 2.8V, 3.0V, 3.3V are the standard options. For other voltages between 1.5V to 3.3V, contact factory. Table 1. Standard Output Voltage Suffix Guide xy OUTPUT VOLTAGE (V) 18 1.8 25 2.5 28 2.8 30 3.0 33 3.3 Nonstandard output voltages from 1.5V to 3.3V are available in 100mV increments. Contact factory for availability. Table 2. RESET Timeout Period Suffix Guide 10 dd RESET TIMEOUT (ms) D1 3.75 D2 30 D3 225 D4 1800 Pin Configurations (continued) TOP VIEW IN 1 GND 2 MAX4836/ MAX4837 SHDN 3 6 OUT 5 SS 4 RESET (FLAG) SOT23 ( ) MAX4836EUTxyC ONLY. Chip Information TRANSISTOR COUNT: 1575 PROCESS: BiCMOS TDFN Exposed Pad: Connected to GND ______________________________________________________________________________________ 500mA LDO Linear Regulators with Current-Limiting Switch 6, 8, &10L, DFN THIN.EPS D N PIN 1 INDEX AREA E E2 DETAIL A CL CL L A L e e PACKAGE OUTLINE, 6, 8, 10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm 21-0137 NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY F 1 2 COMMON DIMENSIONS SYMBOL A MIN. 0.70 0.80 D 2.90 3.10 E 2.90 3.10 0.00 0.05 A1 L k MAX. 0.40 0.20 0.25 MIN. A2 0.20 REF. PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b T633-1 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF T833-1 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF T1033-1 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±0.03 2.40 REF T1433-2 14 1.70±0.10 2.30±0.10 0.40 BSC ---- 0.20±0.03 2.40 REF [(N/2)-1] x e PACKAGE OUTLINE, 6, 8, 10 & 14L, TDFN, EXPOSED PAD, 3x3x0.80 mm 21-0137 F 2 2 ______________________________________________________________________________________ 11 MAX4836/MAX4837 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.) 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.) 6LSOT.EPS MAX4836/MAX4837 500mA LDO Linear Regulators with Current-Limiting Switch PACKAGE OUTLINE, SOT-23, 6L 21-0058 F 1 1 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.