Document
150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR
March 1, 2000
SC8863
TEL:805-498-2111 FAX:805-498-3804 WEB:http://www.semtech.com
DESCRIPTION
The SC8863 is a low dropout linear regulator that operates from a +2.5V to +5.5V input range and delivers up to 150mA. A PMOS pass transistor allows the low 110µA supply current to remain independent of load, making these devices ideal for battery operated portable equipment such as cellular phones, cordless phones and personal digital assistants. The SC8863 output voltage can be preset or adjusted with an external resistor divider. Other features include low powered shutdown, short circuit protection, thermal shutdown protection and reverse battery protection. The SC8863 comes in the tiny 5 lead SOT-23 package.
FEATURES • Guaranteed 150 mA output current • Fixed or adjustable output • Very small external components • Low 75µVRMS output noise • Very low supply current • Thermal overload protection • Reverse battery protection • Low power shutdown • Surface mount packaging (5 pin SOT-23) • Full industrial temperature range APPLICATIONS • Battery Powered Systems • Cellular Telephones • Cordless Telephones • Personal Digital Assistants • Portable Instrumentation • Modems • PCMCIA cards ORDERING INFORMATION
Part Number Package
(1)(2)
BLOCK DIAGRAM
SC8863-XXXCSK
SOT-23-5
Notes: (1) Where -XXX denotes voltage options. Available voltages are: 2.50V (-250), 2.80V (-280), 3.00V (-300), and 3.30 (-330)V. (2) Add suffix ‘TR’ for tape and reel.
ABSOLUTE MAXIMUM RATINGS
Parameter Input Supply Voltage Power Dissipation TA = 70°C Thermal Resistance Symbol VIN PD θJA θJC Maximum -0.6 to +7 571 256 81 -40 to +85 -40 to +150 -65 to +150 +300 1.25 Units V mW °C/W °C/W °C °C °C °C kV 1 © 2000 SEMTECH CORP. 652 MITCHELL ROAD NEWBURY PARK CA 91320
PIN CONFIGURATION
Operating Ambient Temperature Range Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec ESD Rating
TA TJ TSTG TLEAD ESD
150mA ULTRA LOW DROPOUT, LOW NOISE REGULATOR
March 1, 2000
SC8863
PIN DESCRIPTIONS
Pin # 1 2 3 4 5 Pin Name EN GND IN OUT SET Description Active high enable pin. Connect to VIN if not being used. Ground pin. Can be used for heatsinking if needed. Input pin. Regulator output, sourcing up to 150mA Connecting this pin to ground results in the internally preset value for VOUT. Connecting to an external resistor divider changes VOUT to:
R1 VOUT = 1 .250 • 1 + R2
TYPICAL APPLICATION - INTERNALLY PRESET OUTPUT VOLTAGE
U1 VIN > VOUT + VD(MAX) 3 VIN SC8863 VO 4 VOUT @ IOUT up to 150mA
1 C1 1uF Ceramic
EN
GND 2
SET
5 C2 1uF Ceramic
TYPICAL APPLICATION - EXTERNALLY SET OUTPUT VOLTAGE
U1 VIN > VOUT + VD(MAX) 3 VIN SC8863 VO 4 R1 1 EN GND 2 R2 10k SET 5
(1)
VOUT @ IOUT up to 150mA
C1 1uF Ceramic
C2 2.2uF Ceramic
NOTES: (1) Select R1 and R2 such that the current flowing through them is ≥ 10µA (i.e. R2 ≤ 120kΩ). A value of 10kΩ is recommended for R2. Please see Component Selection - .