DESCRIPTION
The CAT6218 is a 300mA CMOS low dropout regulator that provides fast response time during load current and line voltage changes.
The quick-start feature allows the use of an external bypass capacitor to reduce the overall output noise without affecting the turn-on time of just 150μs.
With zero shutdown current and low ground current of 55μA typical, the CAT6218 is ideal for batteryoperated devices with supply voltages from 2.3V to 5.5V. An internal under voltage lockout circuit disables the output at supply voltages under 2.1V typical.
The CAT6218 offers 1% initial accuracy and low dropout voltage, 180mV typical at 300mA. Stable operation is provided with a small value ceramic capacitor, reducing required board space and compo–nent cost.
Other features include fold-back current current limit and thermal protection.
The device is available in the low profile (1mm max height) 5-lead thin SOT23 package.

FEATURES
*Guaranteed 300mA output current
*Low dropout voltage of 180mV typical at 300mA
*Stable with 1μF ceramic output capacitor
*External 10nF bypass capacitor for low noise
*Quick-start feature
*No-load ground current of 55μA typical
*Full-load ground current of 80μA typical
*±1.0% output voltage initial accuracy
*±2.0% accuracy over temperature
*“Zero” current shutdown mode
*Fold-back current limit and under-voltage lockout
*Thermal protection
*Thin SOT23-5 package

APPLICATIONS
*Cellular phones
*Battery-powered devices
*Consumer Electronics

CAT6218-180TD-GT3, CAT6218-240TD-GT3, CAT6218-270TD-GT3

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DESCRIPTION
converter delivering high efficiency in a SOT23-6 package. The device has an internal NMOS switch and PMOS synchronous rectifier and has the capacity of supplying 3.3V at 100mA from a single AA cell input.
High frequency switching (up to 2MHz) minimizes the board area by allowing the use of tiny, low profile inductors and ceramic capacitors.
The KB3436 provides automatic pulse skipping at light loads, thus reducing the supply current for extended battery life. At shutdown, the KB3436 fully discharges the output to ground and draws no supply current.
The KB3436 is available in small SOT23-6 package with both fixed and adjustable output voltage versions.

FEATURES
*Up to 96% efficiency
*Low start-up voltage 0.8V
*Internal synchronous rectifier
*Up to 2MHz switching allows for tiny external components
*0.5V to 4.4V input range
*2.5V to 5.0V output range (Note 3)
*Feedback Voltage: 1.00V +/-2%
*Logic controlled shutdown (<1μA)
*Low 250μA operating supply current (measured at VOUT)
*Pulse skipping at light load for extended battery life
*Generates 3.3V at 100mA from single AA cell
*Stable with ceramic output capacitor
*Low profile 6-Leads SOT23-6 package

APPLICATIONS
*PDAs and organizers
*Digital cameras
*Wireless mice/ keyboards
*Portable medical equipment
*Cordless phones
*Wireless Headsets

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Description
The transmitter module is intended for use at SDH and SONET bit rates. The device meets the intention of the ITU-T (G.691) recommendations.
The single silicon IC is used as a laser driver, modulator and automatic power control. To ensure a proper laser operation over the wide temperature range and life of operation, the average optical output power is controlled. The laser bias is externally accessible for monitoring of the performance. A power alarm is activated when the average optical power cannot be maintained within specification. A laser shut-down is also provided according to SDH/SONET requirements.

Key Features
*Provides 1620 nm supervisory channel laser source for WDM applications according to ITU-T draft G.691
*Average power control
*Small size (40x70x9 mm)
*CMOS alarm output
*Thermoelectric cooler included
*P-ECL data inputs
*Tone modulation input
*Single 5.0 V supply

Applications
*1620 nm supervisory channel applications in WDM systems

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