|Category||Power Management => DC-DC Converters => Step-down|
|Description||PFM Step-up DC/DC Converter
The HT77XXA series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage of 2.7V, 3.0V, 3.3V or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells.
|Company||Holtek Semiconductor Inc.|
|Datasheet||Download HT7727A datasheet
Low start-up voltage: 0.7V (Typ.) High efficiency: 85% (Typ.) High output voltage accuracy: ±2.5% Output voltage: 3.3V, 5.0V Ultra low supply current IDD: 5mA (Typ.) Low ripple and low noise Low shutdown current: 0.5mA (Typ.) SOT-89, SOT-23 and SOT-25 packageApplications
Palmtops/PDAs Portable communicators/Smartphones Cameras/Camcorders Battery-powered equipment
The HT77XXA series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage and high output voltage accuracy. They require only three external components to provide a fixed output voltage or 5.0V. CMOS technology ensures ultra low supply current and makes them ideal for battery-operated applications powered from one or more cells. The HT77XXA consists of an oscillator, a PFM control circuit, a driver transistor, a reference voltage unit, and a high speed comparator. They employ pulse frequency modulation (PFM) for minimum supply current and ripple at light output loading. These devices are available in space saving SOT-89, SOT-23 and SOT-25 packages. For SOT-25 package, it also build-in a chip enable function to reduce power consumption during shutdown mode.
Part No. HT7733A HT7750A Note: ²XX² stands for output voltages. Only lead free devices are available. stands for lead free devices. For the TO-92 package, there will be a mark at the end of the date code. Output Voltage SOT-25 HT77XXA (for TO-92) HT77XXA# (for SOT-89) 77XXA# (for SOT-23) 77XXA# (for SOT-25) Package Marking
Pin No. SOT-23 SOT-25 Pin Name CE VOUT NC GND LX Description Chip enable pin, high active DC/DC converter output monitoring pin No connection Ground pin Switching pin
Supply to VSS+7V Power Consumption (*1).................................. 500mW Power Consumption (*2).................................. 250mW Package Thermal Resistance TO-92, qJA.......................................................180°C/W Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maximum Ratings² may cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. *1: applied to SOT-89 and TO-92 under Ta=25°C *2: applied to SOT-25 under Ta=25°C Storage to 125°C Operating to 85°C
Symbol VIN VOUT VSTART VHOLD IIN IDD ISHDN VIH VIL ILEAK fOSC DOSC h Note: Parameter Input Voltage Output Voltage Tolerance Start-up Voltage (Fig. IOUT=10mA; Ta=25°C (Unless otherwise specified) Test Conditions ¾ VIN: 0®2V; IOUT=1mA Min. VS=VOUT+0.5V, VX=6V Measured at the LX pin VS=VOUT“0.95, VX=6V Measured at LX pin VS=VOUT“0.95, VX=6V Measured at LX pin Typ. Max. Unit V mA kHz %
Minimum Hold-on Voltage (Fig. 1) VIN: 2®0V; IOUT=1mA No-load Input Current (Fig. 1) Supply Current (Fig. 2) Shutdown Current CE High Threshold CE Low Threshold LX Leakage Current (Fig. 3) Maximum Oscillator Frequency (Fig. 3) Oscillator Duty Cycle (Fig. 3) Efficiency IOUT=0mA VS=VOUT+0.5V Measured at VOUT pin CE=GND
Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. The guaranteed specifications apply only for the test conditions listed.
|Related products with the same datasheet|
|Some Part number from the same manufacture Holtek Semiconductor Inc.|
|HT7730A PFM Step-up DC/DC ConverterGeneral DescriptionThe HT77XXA series is a set of PFM step-up DC/DC converter with high efficiency and low ripple. The series features extremely low start-up voltage|
|HT47R10A-1 R-F Type 8-Bit MCUGeneral DescriptionThe HT47R10A-1/HT47C10-1 are 8-bit, high performance, RISC architecture microcontroller devices specifically designed for applications that interface directly|
|HT1632 32x8 & 24x16 LED Driver The HT1632 is a memory mapping LED display controller/driver, which can select a number of out bits and commons. These are 32 out bits & 8 commons and 24 out bits & 16 commons.|
|HT1647 4-Level Gray Scale 64x16 LCD Controller for I/O MCUHT1647 is a peripheral device specially designed for I/O type MCU used to expand the display capability. The max. display segment of the device are 1024|
|HT1647A 4-Level Gray Scale 64x16 LCD Controller for I/O MCUHT1647A is a peripheral device specially designed for I/O type MCU used to expand the display capability. The max. display segment of the device are 1024|
|HT46R343 A/D Type 8-Bit OTP MCU with OPA and 8x8 LED Driver The HT46R343 is 8-bit, high performance, RISC architecture microcontroller devices. With their fully integrated A/D converter they are especially suitable|
|HT1117 1A General Purpose LDOThe HT1117 devices are a series of three-terminal high current low voltage regulators. They can deliver an output current of 1A and can accept input voltages up to 12V. The devices|
|HT82J927A USB GamepadHT82J927A is designed as USB+ Vibration interface gamepad controller,The HT82J927A can easily used via the game controller input function on Windows 98SE/ 2000/XP/XP SP1/XP SP2/2000 SERVER/2003|
|HT83R074 Q-VoiceTMThe HT83R074 is 8-bit high performance microcontroller with voice synthesizer and tone generator. The HT83R074 is designed for applications on multiple I/Os with sound effects, such as voice|
|HT46R4A Cost-Effective A/D Type 8-Bit MCUThe HT46R4A is a device from the Cost-Effective A/D Type Series of MCUs. As an 8-bit high performance RISC architecture microcontroller, the device is designed especially|
|HT1086 1.5A General Purpose LDOThe HT1086 devices are a series of three-terminal high current low voltage regulators. They can deliver an output current of 1.5A and can accept input voltages up to 12V. The devices|
|HT45R35 C/R To F Type 8-Bit OTP MCUThe HT45R35 is an 8-bit high performance, RISC architecture microcontroller device specifically designed for cost-effective multiple I/O control product applications.The|
|HT82K72E One Channel Keyboard With R-F Type MCUThe device is an 8-bit high performance, RISC architecture microcontroller devices specifically designed for multiple I/O control product applications. With its internal|
|HT82A523R USB 2.0 Full Speed 8-Bit OTP MCUThis device is an 8-bit high performance RISC-like microcontroller designed for USB product applications. It is particularly suitable for use in products such as USB mouse|
|HT46R92 A/D Type 8-Bit MCU With 16x16 High Current LED DriverThe HT46R92 is an 8-bit high performance RISC architecture microcontroller, the device is designed especially for applications that interface directly|
|HT46R94 A/D Type 8-Bit MCU With 16x16 High Current LED DriverThe HT46R94 is an 8-bit high performance RISC architecture microcontroller, the device is designed especially for applications that interface directly|
|HT82A834R USB Audio MCUThe HT82A834R is an 8-bit high performance RISC-like microcontroller designed for USB Phone product applications. The HT82A834R combines a 16-bit PCM ADC, USB transceiver, SIE (Serial Interface|
|HT46R4AE Cost-Effective A/D Type 8-Bit MCUThe HT46R4AE is a device from the Cost-Effective A/D Type Series of MCUs. As an 8-bit high performance RISC architecture microcontroller, the device is designed especially|
|HT46RU67 A/D Type 8-Bit MCU With LCDThe HT46RU67/HT46CU67 are 8-bit, high performance, RISC architecture microcontroller devices specifically designed for A/D product applications that interface directly to analog|
|HT46F46E Cost-Effective A/D Flash Type 8-Bit MCU With EEPROMThe Cost-Effective A/D Flash Type MCU with EEPROM Devices are a series of 8-bit high performance RISC architecture microcontrollers, designed especially|
|HT49RA0 Remote Type 8-Bit MCU With LCDThe HT49RA0/HT49CA0 are 8-bit high performance, RISC architecture microcontroller devices specifically designed for multiple I/O control product applications. The mask version|
2SC4754 : NPN Triple Diffused Type ( High Voltage Switching, High Speed DC-DC Converter And Switching Regulator Applications ).
IMP37 : Low Dropout Positive Voltage Regulators. The IMP37 series of Low Dropout (LDO) three-terminal voltage regulators feature guaranteed low dropout voltages at currents to 0.8A. The IMP37 regulator family dropout voltage is guaranteed 0.95V or lower At 100mA, the maximum dropout voltage is 0.8V. Compared with "1117" type LDOs, the IMP37 has a 20% lower dropout voltage. Three fixed output voltages.
KA278R33C : 2A Fixed 3.3V Low Dropout Voltage Regulator (LDO). 9V, 12V output low dropout voltage regulator TO-220 full-mold package (4pin) Overcurrent protection, thermal shutdown Overvoltage protection, short circuit protection With output disable function The is a low-dropout voltage regulator suitable for various electronic equipments. It provides constant voltage power source with TO-220-4 lead full mold package.
LT1461AIS8-2.5 : 2.5V. LT1461AIS8-2.5, Micropower Precision Low Dropout Series Voltage Reference.
LX8415 : LDO. 0.5a Low Dropout Positive Regulators. The LX8415 series ICs are positive Low Dropout (LDO) regulators. At the designed maximum load current, the LX8415 series dropout voltage is guaranteed 1.3V or lower at 0.5A. The dropout voltage decreases with load current. The LX8415 is available in an adjustable output voltage version and fixed output versions of 2.5V and 3.3V. Onchip trimming of the internal.
MIC5254 : MIC5254 Dual 150mA µCap LDO With Error Flag Outputs. Dual 150mA µCap LDO with Error Flag Outputs The is an efficient, precise, dual CMOS voltage regulator. It offers better than 1% initial accuracy, extremely low dropout voltage (typically at 150mA) and low ground current (typically 90µA) over load. The MIC5254 two independent LDOs with error flags that indicate an output fault condition such as overcurrent,.
NJU7771 : Low Dropout Voltage Regulator. s GENERAL is a low dropout voltage regulator designed for cellular phone application. Advanced CMOS technology achieves high ripple rejection and low quiescent current. s qHigh Ripple Rejection 65dB typ. (f=1kHz) qLow quiescent Current Iq=18µA qOutput capacitor with 1.0uF ceramic capacitor qOutput Current Io(max.)=150mA qHigh Precision Output Vo±1.5%.
PT6642 : Non-Isolated DC-DC Converters. Wide Input Voltage Range: to +25V Negative Output: to 15V/1.5A Adjustable Output Voltage 85% Efficiency Remote Sense Capability The PT6640 series is a positive input to negative output line of Integrated Switching Regulators (ISRs). Designed for general purpose applications, the PT6640 series delivers a negative output voltage to 24W. The PT6640 is packaged.
PT7712 : Non-Isolated DC-DC Converters. 20 Amp Programmable Isr Next Generation Big Hammer.
RBO40 : Specific Automotive Load Charge Dump Protection. Reversed Battery And Overvoltage Protection Circuit (RBO).
SC2453 : Multi-Phase Switching Regulators. High-performance Quad-output Switching Regulator.
TLE4216G : Intelligent Sixfold Low-side Switch. Double low-side switch, 0.5 A Quad low-side switch, 50 mA Power limitation Open-collector outputs Overtemperature shutdown Status monitoring Shorted-load protection Integrated clamp Z-Diodes Temperature range 110 °C TLE is an integrated, sixfold low-side power switch with power limiting of the 0.5 A outputs, shorted load protection of the 50 mA switches.
TPIC5303D : Control and Monitoring->Power+ Arrays. ti TPIC5303, 3-Channel Independent Driver.
UNRSeries5V-2.5V : Non-isolated, 5v-to-2.5v 8 And 10 Amp, DC/DC Converters. Low cost! to +5.5V inputs or 10 Amp outputs 200kHz, synchronous-rectifier topology Low output noise, 40mVp-p Quick transient response, 30µsec High efficiencies: 90% for 8A, 89% for to +60/50°C operation with no derating Highly reliable, 100% SMT construction Remote on/off control Output short-circuit protection x 2" metal packages; EMC compliant IEC950/EN60950/UL1950.
CAT825 : System Supervisory Voltage Reset with Watchdog and Manual Reset The CAT823, CAT824, and CAT825 provide basic reset and monitoring functions for the electronic systems. Each device monitors the system voltage and maintains a reset output until that voltage reaches the devices specified trip value and then maintains the reset output active condition.
AS3603 : Power Management Unit The AS3603 is a highly-integrated, ultra-flexible CMOS power management device designed specifically for portable devices such as any standard of mobile phones, PDAs, CD players, digital cameras and other devices powered by 1-cell lithiumbased or 3- 4-cell nickel-based batteries. The device incorporates low dropout regulators (LDOs),.
VND810P-E : High Side Switches Double channel high-side driver. ECOPACK®: lead free and RoHS compliant Automotive Grade: compliance with AEC Guidelines Very low standby current CMOS compatible input On-state open-load detection Off-state open-load detection Thermal shutdown protection and diagnosis Undervoltage shutdown Overvoltage clamp Output stuck to VCC detection Load current limitation Reverse battery protection.
LM5046 : Phase-Shifted Full-Bridge PWM Controller With Integrated MOSFET Drivers The LM5046 PWM controller contains all of the necessary to implement a Phase-Shifted Full-Bridge topology power converter using either current mode or voltage mode control. This device is intended to operate on the primary side of an isolated dc-dc converter with input voltage up to 100V.
ZXLD1371 : Medium Voltage DC-DC LED Drivers The ZXLD1371 is an LED driver controller IC for driving external MOSFETs to drive high current LEDs. It is a multi-topology controller enabling it to efficiently control the current through series connected LEDs. The multi-topology enables it to operate in buck, boost and buck-boost configurations with only one current.