Серия DC-DC интегральных преобразователей HT7737
HOLTEK Semiconductor Inc.
Общие характеристики
| Раздел | DC-DC преобразователи интегральные |
| Корпус | SIP3 |
| Режим преобразования |  |
| Входное напряжение |  |
| Выходное напряжение |  |
| Кол-во выходов |  |
| Ток собственного потребления |  |
| Встроенные возможности |  |
| Рабочая температура |  |
Документация на серию HT7737
HT77xxB
5V/100mA PFM
Asynchronous Step-up Converter
Features
General Description
• Low startup voltage: 0.85V (Typical)
The HT77xxB series is a set of PFM step-up DC/DC
converters with high efficiency and low ripple. The
series features extremely low start-up voltage and
high output voltage accuracy. They require only few
external components to provide a fixed output voltage
of 1.8V, 2.2V, 2.7V, 3.0V, 3.3V, 3.7V and 5.0V.
CMOS technology ensures low supply current and
makes them ideal for battery-operated applications
powered from one or more cells.
• High efficiency Up to 85%
• Ultra low no load input current
• High output voltage accuracy: ±2.5%
• Fixed output voltage: 1.8V, 2.2V, 2.7V, 3.0V, 3.3V,
3.7V and 5.0V
• Ultra low shutdown current: 0.1μA (Typical)
• Package type: 3-pin SOT89, 3-pin SOT23 and
5-pin SOT23
The HT77xxB series consist 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 3-pin
SOT89, 3-pin SOT23 and 5-pin SOT23 packages.
For the 5-pin SOT23 package, it also contains a chip
enable function to reduce power consumption during
shutdown mode.
Applications
• One, two and three cell alkaline and NiMH/NiCd
bettery powered portable products
• Portable equipment/handheld devices
Typical Application Circuits
D1: 1N5817
L1: 47μH~100μH
(Coil Inductor)
VIN
LX
VOUT
OUT
HT77xxB
C1: 47μF
OFF ON
CE
R1*
GND
C2: 22μF
(Ceramic)
* R1=0.15Ω is recommended to improve ripple performance
Selection Table
Part No.
Output Voltage
HT7718B
1.8V
HT7722B
2.2V
HT7727B
2.7V
HT7730B
3.0V
HT7733B
3.3V
HT7737B
3.7V
HT7750B
5.0V
Packages
SOT89
SOT23
SOT23-5
Markings
77xxB marking for SOT89 type
7xxB marking for SOT23 and SOT23-5 types
Note: ″xx″ stands for output voltages.
Rev. 1.30
1
August 17, 2021
PDF
Товары серии HT7737