MAX4836/MAX4837 19-3374 Rev 0 7/04 500mA LDO Linear Regulators with Current-Limiting Switch General Description Features The MAX4836/MAX4837 family of low-dropout (LDO) Guaranteed Minimum 500mA Load Current linear regulators feature an accurate current-limiting Accurate Current Limit switch with an integrated FLAG or RESET function. These devices operate from 2.5V to 5.5V and deliver up to Preset Output Voltages: 1.8V/2.5V/2.8V/3.0V/3.3V 500mA of load current at a preset output voltage. Preset 2.5V to 5.5V Supply Voltage Range output voltage levels are 1.8V/2.5V/2.8V/3.0V/3.3V. The MAX4836/MAX4837 offer a programmable soft- Adjustable Soft-Start start control function to eliminate false reset during Low Dropout Voltage startup. The MAX4836 provides a FLAG function to noti- fy the system when the load current exceeds the limit. Thermal Shutdown The MAX4837 provides a RESET function to notify the Reverse-Current Protection system when the output drops below the threshold. Additionally, reverse-current protection prevents cur- Shutdown Output Discharge (MAX4837) rent flowing from the output to the input. Other features Low 90A Supply Current include a low 90A quiescent current, a 0.1A shut- down current. Ultra-Low 0.1A Shutdown Current The MAX4836/MAX4837 are available in space-saving FLAG and Latch Off (MAX4836) or RESET 6-pin SOT23 and TDFN packages. Each device is speci- (MAX4837) fied over the -40C to +85C extended temperature Tiny SOT23 and TDFN (3mm x 3mm) Packages range. Contact factory for other programmed output volt- age versions from 1.5V to 3.3V in 100mV increments. For pin-compatible 100mA versions of this device, refer Ordering Information to the MAX4832/MAX4833. For pin-compatible 250mA PART TEMP RANGE PIN-PACKAGE versions of this device, refer to the MAX4834/MAX4835. MAX4836EUTxy -T* -40C to +85C 6 SOT23-6 Applications MAX4836ETTxy -T -40C to +85C 6 TDFN-6 SDIO Ports and Devices Notebook Computers MAX4837EUTxy dd-T* -40C to +85C 6 SOT23-6 USB Ports and Devices Cell Phones MAX4837ETTxy dd-T -40C to +85C 6 TDFN-6 PDAs and Palmtop Devices GPS Systems Note: xy are placeholders for the output voltage levels of the devices. Insert the values found in Table 1 at the end of this doc- ument 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 Pin Configurations timeout period. Insert the values found in Table 2 in the place of dd. For example, MAX4837EUT18BD2 has a 1.8V output volt- TOP VIEW age, 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 mini- IN 1 OUT 6 mum order increment of 2.5k units. Nonstandard versions must be ordered in 10k unit increments. Contact factory for availability. 2 5 GND SS *Future productcontact factory for availability. MAX4836/MAX4837 3 RESET SHDN 4 EXPOSED PADDLE (FLAG) 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 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.500mA LDO Linear Regulators with Current-Limiting Switch ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (T = +70C) IN, SHDN, FLAG, OUT to GND ................................-0.3V to +6V A 6-Pin SOT23 (derate 9.1mW/C above +70C)................727mW RESET to GND .........................................-0.3V to (V + 0.3V) OUT SS to GND ...................................................-0.3V to (V + 0.3V) 6-Pin TDFN (derate 24.4mW/C above +70C) ..........1951.2mW IN Operating Temperature Range ...........................-40C to +85C IN to OUT...............................................................................6V OUT Short Circuit to GND ..........................................Continuous Operating Junction Temperature Range...........-40C to +125C Storage Temperature Range .............................-65C to +150C All Pins ESD Handling (Human Body Model).........................2kV 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 (V = V + 1V, SHDN = IN, C = 3.3F, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) IN OUT OUT A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage V 2.5 5.5 V IN Input Undervoltage Lockout V V rising 2.00 2.25 V UVLO IN Threshold Input Undervoltage Lockout 50 mV Threshold Hysteresis SHDN = IN, I = 0 90 150 OUT SHDN = IN, I = 0, OUT 150 Quiescent Current I A Q V < V < V (nominal) UVLO IN OUT SHDN = GND, I = 0 0.1 2 OUT T = +25C 200 300 A Dropout Voltage (Note 2) I = 500mA mV OUT T = -40C to +85C 330 A I = 1mA to 500mA, T = +25C -1.3 +1.3 OUT A Output Voltage Accuracy %V NOM I = 1mA to 500mA, T = -40C to +85C -2 +2 OUT A Output Current I 500 mA OUT Output Current Limit V = 0V 540 660 mA OUT Reverse Current at V V = 5.5V, V = 0V to V 0.1 2 A IN OUT IN OUT C = not connected 0.5 1 2.0 SS Soft-Start Time (Note 3) t ms SS C = 0.01F 4 10 15 SS C = 0.1F 40 100 150 SS T = +25C -0.04 +0.02 +0.065 V + 0.5V < V < A %V / OUT IN NOM Line Regulation (Note 4) 5.5V, I = 100A V LOAD T = -40C to +85C -0.05 +0.03 +0.08 A Load Regulation 100A < I < 500mA, V = V + 1V 1.3 %V LOAD IN OUT NOM Output Noise 10Hz to 100kHz, C = 0.01F 70 V SS RMS SHUTDOWN INPUT (SHDN) OUT Discharge Resistance in SHDN = GND 900 Shutdown (MAX4837) SHDN Input-Voltage High V 1.4 V IH SHDN Input-Voltage Low V 0.5 V IL SHDN Input Hysteresis 30 mV SHDN Input Leakage Current SHDN = IN or GND -100 +100 nA 2 MAX4836/MAX4837