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19-2733; Rev 0; 1/03
KIT ATION EVALU BLE AVAILA
Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP
General Description Features
o Guaranteed 200mA Output Current o Low 100mV (typ) Dropout at 100mA o Low 40VRMS Output Noise o Low 80A Operating Supply Current o 62dB PSRR o <1A Shutdown Current o Thermal-Overload and Short-Circuit Protection o Output Current Limit o Tiny 1.16mm x 1.57mm x 0.66mm UCSP (3 x 2 Grid)
MAX8532
The MAX8532 offers the benefits of low-dropout voltage and ultra-low power regulation in a subminiaturized UCSP, making it ideal for space-restricted portable equipment. The device operates from a 2.5V to 6.5V input and delivers up to 200mA, with low dropout of 100mV (typ) at 100mA. Designed with an internal P-channel MOSFET pass transistor, the supply current is kept at a low 80A, independent of the load current and dropout voltage. Other features include short-circuit protection and thermal-shutdown protection. The MAX8532 includes a reference bypass pin for low output noise (40VRMS) and a logic-controlled shutdown input. The device is available in a tiny 6-pin UCSP.
Applications
Cellular and Cordless Phones PDAs and Palmtop Computers Notebook Computers Digital Cameras PCMCIA Cards Wireless LAN Cards Hand-Held Instruments
PART MAX8532EBT_*
Ordering Information
TEMP RANGE -40C to +85C OUT VOLTAGE 1.5V to 3.3V PINPACKAGE 6 UCSP
*"_" = Output voltage code (see the Output Voltage Selector Guide).
Output Voltage Selector Guide
PART MAX8532EBTJ MAX8532EBTG VOUT (V) 2.85 3 TOP MARK ACP ACU
Note: Contact the factory for other output voltages between 1.5V and 3.3V. The minimum order quantity is 25,000 units.
Typical Operating Circuit
TOP VIEW
INPUT 2.5V TO 6.5V CIN 2.2F OUTPUT 1.5V TO 3.3V AT 200mA 2.2F GND A1
Pin Configuration
SHDN A2
BP A3
IN
OUT
MAX8532
B1 ON OFF GND SHDN BP 10nF OUT
MAX8532EBT
B2 IN B3 N.C.
UCSP
________________________________________________________________ Maxim Integrated Products
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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.
Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP MAX8532
ABSOLUTE MAXIMUM RATINGS
IN, SHDN, BP to GND ..............................................-0.3V to +7V OUT to GND ................................................-0.3V to (VIN + 0.3V) Output Short-Circuit Duration ........................................Indefinite Continuous Power Dissipation (TA = +70C) 6-Pin UCSP (derate 3.9mW/C above +70C) ..............308mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C 6-Pin UCSP Solder Profile ............................................(Note 1)
Note 1: For UCSP solder profile information, visit www.maxim-ic.com/1st_pages/UCSP.html.
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
(IN = 3.8V, SHDN = IN, CBP = 10nF, TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.) (Note 2)
PARAMETER Input Voltage Undervoltage Lockout Threshold Output Voltage Accuracy Maximum Output Current Current Limit Ground Current Dropout Voltage Line Regulation Output Voltage Noise Ripple Rejection SHUTDOWN SHDN Supply Current SHDN Input Threshold SHDN Input Bias Current THERMAL PROTECTION Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis TSHDN TSHDN TJ rising 160 10 C C IOFF VIH VIL ISHDN SHDN = 0, TA = +25C SHDN = 0, TA = +85C Input high voltage Input low voltage SHDN = IN or GND TA = +25C TA = +85C 0.7 0.8 1.6 0.4 100 0.01 0.1 1 A V nA PSRR IOUT ILIM IQ VOUT - VIN VLNR No load IOUT = 100mA IOUT = 100mA (Note 3) IN = (OUT + 0.1V) to 3.8V 10Hz to 100kHz, COUT = 10F, IOUT = 10mA 100Hz, IOUT = 30mA -0.2 40 62 SYMBOL VIN VUVLO IN rising, hysteresis is 40mV (typ) TA = +25C, IOUT = 1mA TA = -40C to +85C, IOUT = 1mA TA = -40C to +85C, IOUT = 0.1mA to 200mA CONDITIONS MIN 2.5 2.15 -1 -2 -3 200 210 330 80 100 100 200 +0.2 550 150 2.25 TYP MAX 6.5 2.42 +1 +2 +3 mA mA A mV %/V VRMS dB % UNITS V V
Note 2: All units are 100% production tested at TA = +25C. Limits over the operating temperature range are guaranteed by design. Note 3: The dropout voltage is defined as VIN - VOUT, when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V. Specification applies only when VOUT > = 2.5V.
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Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP
Typical Operating Characteristics
(VOUT = 2.85V, load = 80mA, VIN = 3.8V, COUT = 2.2F, CBP = 0.01F, and CIN = 2.2F. TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX8532 toc01
MAX8532
SUPPLY CURRENT vs. LOAD CURRENT
MAX8532 toc02
SUPPLY CURRENT vs. TEMPERATURE
MAX8532 toc03
140 120 SUPPLY CURRENT (A) 100 80 60 40 20 0
140 120 SUPPLY CURRENT (A) 100 80 60 40 20 0
140 120 SUPPLY CURRENT (A) 80mA LOAD 100 80 60 40 20 0 0 1 2 3 4 5 6 SUPPLY VOLTAGE (V) NO LOAD
0
10
20
30
40
50
60
70
80
-40
-15
10
35
60
85
LOAD CURRENT (mA)
TEMPERATURE (C)
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8532 toc04
LDO DROPOUT VOLTAGE vs. VOUT
MAX8532 toc05
OUTPUT VOLTAGE ACCURACY vs. TEMPERATURE
MAX8532 toc06
250
120 100 DROPOUT VOLTAGE (mV) 80 60 40 20 0
0.6 0.4 OUTPUT VOLTAGE (%) 0.2 0 -0.2 -0.4 -0.6
DROPOUT VOLTAGE (mV)
200
150
IOUT = 80mA
100
50
0 0 20 40 60 80 100 120 140 160 180 200 LOAD CURRENT (mA)
2.5
2.6
2.7
2.8
2.9 VOUT (V)
3.0
3.1
3.2
3.3
-40
-15
10
35
60
85
TEMPERATURE (C)
PSRR vs. FREQUENCY
100 LOAD 60 50 PSRR (dB) 40 30 20 10 0 0.01 0.1 1 10 100 1000 FREQUENCY (kHz) 10 0.01
MAX8532 toc07
OUTPUT NOISE SPECTRAL DENSITY vs. FREQUENCY
MAX8532 toc08
OUTPUT NOISE (10Hz TO 100kHz)
MAX8532 toc09
70
10000
NOISE DENSITY (nVRMS/Hz)
1000 VOUT 100 500V/div
0.1
1 FREQUENCY (kHz)
10
100
1ms/div
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Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP MAX8532
Typical Operating Characteristics (continued)
(VOUT = 2.85V, load = 80mA, VIN = 3.8V, COUT = 2.2F, CBP = 0.01F, and CIN = 2.2F. TA = +25C, unless otherwise noted.)
LOAD TRANSIENT VIN = 3.35V, ILOAD = 1mA TO 80mA
4.5V 3.5V 1V/div VOUT 20mV/div AC-COUPLED
LINE TRANSIENT
VIN
MAX8532 toc10
MAX8532 toc11
VOUT
20mV/div AC-COUPLED
50mA/div ILOAD 0
40s/div
10s/div
LOAD TRANSIENT NEAR DROPOUT
MAX8532 toc12
SHUTDOWN RESPONSE
MAX8532 toc13
VOUT
20mV/div AC-COUPLED
VOUT
2V/div 0
VIN = VOUT + 0.1V 50mA/div ILOAD 0 VSHDN
1V/div
0
10s/div
1ms/div
Pin Description
PIN B3 B2 B1 A1 A2 A3 NAME N.C. IN OUT GND SHDN BP Not Connected Regulator Input Regulator Output. Guaranteed 200mA output current. Ground Shutdown Input. A logic low shuts down the regulator. Connect to IN for normal operation. Reference Noise Bypass. Bypass with a 0.01F ceramic capacitor for reduced noise. FUNCTION
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Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP
Functional Diagram
MAX8532
IN
SHDN
SHUTDOWN AND POWER-ON CONTROL ERROR AMP
MOS DRIVER WITH ILIMIT OUT
MAX8532
THERMAL SENSOR 1.25V REF
GND BP
Detailed Description
The MAX8532 is a low-power, low-dropout, low-quiescent current linear regulator designed primarily for battery-powered applications. For preset output voltages, see the Output Voltage Selector Guide. The device supplies up to 200mA for OUT. The MAX8532 consists of a 1.25V reference, error amplifier, P-channel pass transistor, reference bypass block, and internal feedback voltage divider. The 1.25V bandgap reference is connected to the error amplifier's inverting input. The error amplifier compares this reference with the feedback voltage and amplifies the difference. If the feedback voltage is lower than the reference voltage, the pass-transistor gate is pulled lower, allowing more current to pass to the output and increasing the output voltage. If the feedback voltage is high, the pass-transistor gate is pulled up, allowing less current to pass to the output. The output voltage is fed back through an internal resistor voltage-divider connected to the OUT pin.
Shutdown
The MAX8532 has a single shutdown control input (SHDN). Drive SHDN low to shut down the output, reducing supply current to 10nA. Connect SHDN to a logic-high, or IN, for normal operation.
Internal P-Channel Pass Transistor
The MAX8532 features a 1 P-channel MOSFET pass transistor. A P-channel MOSFET provides several advantages over similar designs using PNP pass transistors, including longer battery life. It requires no base drive, reducing quiescent current. PNP-based regulators waste considerable current in dropout when the pass transistor saturates and also use high base-drive currents under heavy loads. The MAX8532 does not suffer these problems and consumes only 90A quiecent current whether in dropout, light-load, or heavy-load applications (see the Typical Operating Characteristics). Whereas a PNPbased regulator has dropout voltage independent of the load, a P-channel MOSFET's dropout voltage is proportional to load current, providing for low dropout voltage at heavy loads and extremely low dropout voltage at lighter loads.
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_______________________________________________________________________________________
Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP MAX8532
Current Limit
The MAX8532 contains an independent current limiter, which monitors and controls the pass transistor's gate voltage, limiting the output current to 210mA (min). The output can be shorted to ground indefinitely without damaging the part.
Low-Noise Operation
An external 0.01F bypass capacitor at BP, in conjunction with an internal resistor, creates a lowpass filter. The MAX8532 exhibits 40VRMS output voltage noise with CBP = 0.01F and COUT = 2.2F (see the Output Noise Spectral Density vs. Frequency graph in the Typical Operating Characteristics).
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation in the MAX8532. When the junction temperature exceeds TJ = +160C, the thermal sensor signals the shutdown logic, turning off the pass transistor and allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IC's junction temperature cools by 10C, resulting in a pulsed output during continuous thermal-overload conditions. Thermal-overload protection is designed to protect the MAX8532 in the event of fault conditions. For continual operation, do not exceed the absolute maximum junction temperature rating of TJ = +150C.
Applications Information
Capacitor Selection and Regulator Stability
Use a 2.2F capacitor on the MAX8532's input. Larger input capacitor values with lower ESR provide better supply-noise rejection and line-transient response. To reduce noise and improve load transients, use large output capacitors up to 10F. For stable operation over the full temperature range and with rated maximum load currents, use a minimum of 2.2F (or 1F for <150mA loading) for OUT. Note that some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. With dielectrics such as Z5U and Y5V, use 4.7F or more to ensure stability at temperatures below -10C. With X7R or X5R dielectrics, 2.2F is sufficient at all operating temperatures. These regulators are optimized for ceramic capacitors. Tantalum capacitors are not recommended.
Operating Region and Power Dissipation
The MAX8532's maximum power dissipation depends on the thermal resistance of the case and circuit board, the temperature difference between the die junction and ambient air, and the airflow rate. The power dissipation across the device is P = I OUT (V IN - V OUT ). Maximum power dissipation: PMAX = (TJ - TA)/(JB + BA) where TJ - TA is the temperature difference between the MAX8532 die junction and the surrounding air, JB (or JC) is the thermal resistance of the package, and BA is the thermal resistance through the printed circuit board, copper traces, and other materials, to the surrounding air.
PSRR and Operation from Sources Other than Batteries
The MAX8532 is designed to deliver low dropout voltages and low quiescent currents in battery-powered systems. Power-supply rejection is 62dB at low frequencies (see the Power-Supply Rejection Ratio vs. Frequency graph in the Typical Operating Characteristics). When operating from sources other than batteries, improve supply-noise rejection and transient response by increasing the values of the input and output bypass capacitors and through passive filtering techniques.
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Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP
Load-Transient Considerations
The MAX8532 load-transient response graphs (see the Typical Operating Characteristics) show two components of the output response: a DC shift in the output voltage due to the different load currents, and the transient response. Increase the output capacitor's value and decrease its ESR to attenuate transient spikes. Ascertain the maximum power dissipation by calculating the power dissipation of the package as a function of the input voltage, output voltage, and output current. The maximum power dissipation should not exceed the package's maximum power rating: P = (VIN(MAX) - VOUT) x IOUT where: VIN(MAX) = Maximum input voltage PMAX = Maximum power dissipation of the package (308mW for UCSP) VOUT = Output voltage of OUT IOUT = Maximum output current of OUT P should be less than PMAX.
MAX8532
Input/Output (Dropout Voltage)
A regulator's minimum input/output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end-of-life battery voltage. Because the MAX8532 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of drain-to-source onresistance (RDS(ON)) multiplied by the load current (see the Typical Operating Characteristics).
Calculating the Maximum Output Power in UCSP
The maximum output power of the MAX8532 can be limited by the maximum power dissipation of the package.
Chip Information
TRANSISTOR COUNT: 1320 PROCESS: BiCMOS
_______________________________________________________________________________________
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Low-Noise, Low-Dropout, 200mA Linear Regulator in UCSP MAX8532
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.)
6L, UCSP.EPS
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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