Document
19-2584; Rev 0; 10/02
Low-Noise, Low-Dropout, 200mA Linear Regulator
General Description
The MAX1598 low-noise, low-dropout linear regulator operates from a 2.5V to 6.5V input and delivers up to 200mA. Typical output noise is 30µVRMS, and typical dropout is only 236mV at 200mA. The output voltage is preset to voltages from 2.5V to 5V in 100mV increments. Designed with an internal P-channel MOSFET pass transistor, the MAX1598 maintains a low 100µA supply current independent of the load current and dropout voltage. Other features include a 10nA logic-controlled shutdown mode, short-circuit and thermal-shutdown protection, and reverse battery protection. The device also includes an autodischarge function, which actively discharges the output voltage to ground when the device is placed in shutdown. The MAX1598 comes in a thin 5-pin SOT23 package. o 200mA Output Current o Low Output Noise: 30µVRMS o Low 55mV Dropout at 50mA Output o Low 85µA No-Load Supply Current o Low 100µA Operating Supply Current, Even in Dropout o Thermal-Overload and Short-Circuit Protection o Reverse Battery Protection o Output Current Limit o Preset Output Voltages o 10nA Logic-Controlled Shutdown
Features
MAX1598
Applications
Cellular, Cordless, and PCS Phones PCMCIA Cards Modems Hand-Held Instruments Palmtop Computers Electronic Planners
PART MAX1598EZKxy-T*
Ordering Information
TEMP RANGE -40°C to +85°C PIN-PACKAGE Thin SOT23-5
*xy is the output voltage code (see the Selector Guide at end of data sheet).
Typical Operating Circuit
TOP VIEW
INPUT 2.5V TO 6.5V IN CIN 1µF ON OFF CBP 0.01µF OUT COUT 2.2µF OUTPUT PRESET 2.5V TO 5V 200mA
Pin Configuration
IN 1
5
OUT
MAX1598
SHDN BP GND
GND 2
MAX1598
SHDN 3
4
BP
THIN SOT23-5
________________________________________________________________ Maxim Integrated Products
1
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Low-Noise, Low-Dropout, 200mA Linear Regulator MAX1598
ABSOLUTE MAXIMUM RATINGS
IN to GND ....................................................................-7V to +7V Output Short-Circuit Duration ............................................Infinite SHDN to GND..............................................................-7V to +7V SHDN to IN ...............................................................-7V to +0.3V OUT, BP to GND ..........................................-0.3V to (VIN + 0.3V) Continuous Power Dissipation (TA = +70°C) 5-Pin Thin SOT23 (derate 9.1mW/°C above +70°C) ....727mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C θJB (thin).........................................................................110°C/W Storage Temperature.........................................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed u.