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

General Description
The kB2338A is a high efficiency, 3W mono class-D audio power amplifier. A low noise, filterless PWM architecture eliminates the output filter, reducing external component count, system cost, and simplifying design.
Operating in a single 5V supply, kB2338A is capable of driving 4Ω speaker load at a continuous average output of 3W/10% THD+N or 2W/1% THD+N. The kB2338A has high efficiency with speaker load compared to a typical class AB amplifier. With a 3.6V supply driving an 8Ω speaker , the efficiency for a 400mW power level is 88%. In cellular handsets, the earpiece, speaker phone, and melody ringer can each be driven by the kB2338A. The gain of kB2338A is externally configurable which allows independent gain control from multiple sources by summing signals from seperate sources.
The kB2338A is available in space-saving WCSP and DFN packages.

Features
*Unique Modulation Scheme Reduces EMI Emissions
*Efficiency at 3.6V With an 8-Ω Speaker:
-88% at 400 mW
-80% at 100 mW
*Low 2.38-mA Quiescent Current and 0.5-μA Shutdown Current
*2.5V to 6.0V Wide Supply Voltage
*Optimized PWM Output Stage Eliminates LC Output Filter
*Improved PSRR (-72 dB) Eliminates Need for a Voltage Regulator
*Fully Differential Design Reduces RF Rectification and Eliminates Bypass Capacitor
*Improved CMRR Eliminates Two Input Coupling Capacitors
*Internally Generated 250-kHz Switching Frequency
*Integrated Pop and Click Suppression Circuitry
*1.5mm x 1.5mm Wafer Chip Scale Package (WCSP) and 3mm x 3mm DFN-8 package
*RoHS compliant and 100% lead(Pb)-free

Applications
*Cellular Phone
*Portable Electronic Devices
*PDAs and Smart Phones
*Portable Computer

KBA2338-WCSP

DESCRIPTION
The KB3361 SwitchReg is a member of Kingbor(KB) product family. It is a 1.4MHz stepdown converter with an input voltage range of 2.5V to 6.5V and output as low as 0.6V. Its low supply current, small size, and high switching frequency make the KB3361 the ideal choice for portable applications.
The KB3361 is available in either a programmable version with external feedback resistors. It can deliver up to 800mA of load current while maintaining a low 75μA no load quiescent current. The 1.4MHz switching frequency minimizes the size of external components while keeping switching losses low.The KB3361 feedback and control delivers excel lent load regulation and transient response with a small output inductor and capacitor.
The KB3361 is designed to maintain high efficiency throughout the operating range and provides fast turn-on time.
The KB3361 is available in a low profile (1.3mm) SOT23-5 package and is rated over the -40°C to +85°C temperature range.

FEATURES
*High Efficiency: Up to 97%
*75 μ A No Load Quiescent Current
*800mA Output Current
*2.5V to 6.5V Input Voltage Range
*1.4MHz Switching Frequency
*No Schottky Diode Required
*Low Dropout Operation: 100% Duty Cycle
*0.6V Reference Allows Low Output Voltages
*Shutdown Mode Draws

APPLICATIONS
*Cellular Telephones
*Personal Information Appliances
*Wireless and DSL Modems
*Digital Still Cameras
*MP3 Players
*Portable Instruments

DESCRIPTION
The KB3386 is a current regulated charge pump ideal for powering high brightness LEDs for camera flash applications. The charge pump can be set to regulate two current levels for FLASH and TORCH modes. The KB3386 automatically switches modes between step-up and step-down ensuring that LED current does not depend on the forward voltage. A low current sense reference voltage (50mV) allows the use of small 0603 current sensing resistors. The KB3386 is . offered in 10-pin DFN package.

FEATURES
*Output Current up to 400mA
*Up to 94% Efficiency in Torch Mode
*Automatic Softstart Limits Inrush Current
*Adjustable FLASH Mode
*x1 and x2 Automatic Modes for High Efficiency
*Minimum External Components: No Inductors
*High Frequency Operation: 2.4 MHz
*Low 50mV Reference for low Loss Sensing
*1ㅇA Shutdown Current
*PWM Dimming Control
*Automatic Switchover Between Buck/Boost
*Overvoltage Protection on Output
*Overcurrent/Temerature Protection
*Low Ripple and EMI
*Space Saving 10-pin 3mm x 3mm DFN Package

APPLICATIONS
*White LED Torch/Flash for Cell Phones, DSCs, and Camcorders
*Generic Lighting/Flash/Strobe Applications
*White LED Backlighting

KB3386ER

DESCRIPTION
The KB3511 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.8V and 3.3V. Supply current during operation is only 25μA and drops to 1μA in shutdown. The 2.5V to 6.5V input voltage range makes the KB3511 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.
Automatic Trickle Mode operation increases efficiency at light loads, further extending battery life. Switching frequency is internally set at 2.2MHz, allowing the use of small surface mount inductors and capacitors.
The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode. Low output voltages are easily supported with the 0.6V feedback reference voltage. The KB3511 is available in a low profile (0.8mm) DFN33-10 package.

FEATURES
*Up to 97% Efficiency
*25uA No Load Current Per Channel
*800mA Output Current
*2.5V to 6.5V Input Voltage Range
*2.2MHz Constant Frequency Operation
*No Schottky Diode Required
*Low Dropout Operation: 100% Duty Cycle
*0.6V Reference Allows Low Output Voltages
*Shutdown Mode Draws 1μA Supply Current
*Current Mode Operation for Excellent Line and Load Transient Response
*Overtemperature Protected
*DFN33-10 Package

APPLICATIONS
*Cellular Telephones
*Personal Information Appliances
*Wireless and DSL Modems
*Digital Still Cameras
*MP3 Players
*Portable Instruments

KB3511A, KB3511B

DESCRIPTION
The KB3302 is a high-frequency current-mode step-up switching regulator with an integrated 2A power transistor. Its high switching frequency (programmable up to 2MHz) allows the use of tiny surface-mount external passive components. Programmable soft-start eliminates high inrush current during start-up. The internal switch is rated at 32V making the converter suitable for high voltage applications such as Boost, SEPIC and Flyback.
The operating frequency of the KB3302 can be set with an external resistor. The ability to set the operating frequency gives the KB3302 design flexibilities. A dedicated COMP pin allows optimization of the loop response. The KB3302 is available in thermally enhanced 8-Pin MSOP packages.

FEATURES
*Up to 95% Efficiency
*TDB uA No Load Current
*1000mA Output Current
*1.5V to 16V Input Voltage Range
*Programmable switching frequency up to 2MHz
*Output voltage up to 32V
*Constant switching frequency current-mode control
*1.23V Reference Allows Low Output Voltages
*Shutdown Mode Draws

KB3302DD, KB3302EMS

DESCRIPTION
The KB 4540 is a complete constant-current/constantvoltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count make the KB4540 ideally suited for portable applications.
Furthermore, the KB4540 is specifically designed to work within USB power specifications.
No external sense resistor is needed, and no blocking diode is required due to the internal MOSFET architecture.
Thermal feedback regulates the charge current to limit the die temperature during high power operation or high ambient temperature.
The charge voltage is fixed at 4.2V, and the charge current can be programmed externally with
a single resistor.
The KB4540 automatically terminates the charge cycle when the charge current drops to 1/10th
the programmed value after the final float voltage is reached.
When the input supply (wall adapter or USB supply) is removed, the KB4540 automatically enters a low current state, dropping the battery drain current to less than 2μA.
The KB4540 can be put into shutdown mode, reducing the supply current to 25μA.
Other features include charge current monitor, undervoltage lockout, automatic recharge and a status pin to indicate charge termination and the presence of an input voltage.

FEATURES
* Programmable Charge Current Up to 800mA
* No MOSFET, Sense Resistor or Blocking Diode Required
* Complete Linear Charger in SOT Package for Single Cell Lithium-Ion Batteries
* Constant-Current/Constant-Voltage Operation with Thermal Regulation to Maximize Charge Rate Without Risk of Overheating
* Charges Single Cell Li-Ion Batteries Directly from USB Port
* Preset 4.2V Charge Voltage with ±1% Accuracy
* Charge Current Monitor Output for Gas Gauging
* Automatic Recharge
* Charge Status Output Pin
* C/10 Charge Termination
* 25μA Supply Current in Shutdown
* 2.9V Trickle Charge Threshold (KB4540)
* Available Without Trickle Charge (KB4540X)
* Soft-Start Limits Inrush Current
* Available in SOT23-5 Package

DESCRIPTION
The KB4312 step-up converter drives white LEDs with a constant current to provide backlight in cell phones, PDAs, and other hand-held devices.
It features allowing series connection of the white LEDs so that the LED currents are identical for uniform brightness.
An enable input can be pulsed repeatedly to adjust LED’s brightness.
The fast 1.2MHz current-mode PWM control allows for smaller capacitor and inductor.
Fault condition protection uses cycle-by-cycle current limiting to sense maximum inductor current, thermal protection and over-voltage protection.
Also included soft-start eliminates inrush current during start-up.
The 0.24V low reference voltage minimized the power loss across the current-setting resistor.

FEATURES
* Operating Voltage:2.5V~6.5V
* High Operating Frequency: 1.2MHz
* High Efficiency: Up to 92%
* High Output Voltage: Up to 28V(max)
* Shutdown Current <1uA
* 18V Output Over-voltage protection (ADJ)
* Digital Dimming Control.
* Built-in Cycle-by Cycle Current-limiting.
* Built-in Soft-Start Function.
* 0.24V Low Reference Voltage(+/-5%)
* Tiny SOT23 Package

APPLICATIONS
* LED Module
* LED Backlight for LCD Display (1" ~6.5" )
* Constant Current Source

DESCRIPTION
 The KB1365, step-down constant-current high-brightness LED (HB LED) drivers provide a cost-effective solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs such as MR16 and other LED illumination applications.
The KB1365 operate from a 5.5v to 40V input voltage range and feature a 5V/10mA on-board regulator.
A high-side current-sense resistor adjusts the output current and a dedicated PWM input (DIM) enables a wide range of pulsed dimming.
The KB1365 i well suited for applications requiring a wide input voltage range.
The high-side current-sensing and an integrated current-setting circuitry minimize the number of external components while delivteretic coltrol algorithm ensures excellent input-supply rejection and fast response during load transients and PWM dimming.
The KB1365 featurds a 20% inductor current ripple.
These devices operate up to 2MHz switching frequency, thus allowing for small component size.

FEATURES
* 5.5V to 40V Input Voltage Range
* High-Side Current Sense
* 20kHz Maximum Dimming Frequency
* Hysteretic Contorl: No Compensation
* 200m V Low Reference Voltage(5%)
* Dedicated Dimming Control Input
* Up to 2MHz Switching Frequency
* Adjustable Constant LED Current
* Up to 5 A Constant Current Output
* 5V, 10mA On-Board Regulator
* -40˚C to +125˚C Operating Temperature Range
* SOT23-6 package

APPLICATIONS
* MR16 and Other LED bulbs
* Power Led driver
* Constant Current Source

KB1365GRE