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參數資料
| 型號： | MIC38C44BMM |
| 廠商： | MICREL INC |
| 元件分類： | 穩壓器 |
| 英文描述： | BiCMOS Current-Mode PWM Controllers |
| 中文描述： | 0.5 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數： | 1/8頁 |
| 文件大小： | 74K |
| 代理商： | MIC38C44BMM |
MIC38HC42/3/4/5
Micrel
August 2000
1
MIC38HC42/3/4/5
MIC38HC42/3/4/5
BiCMOS 1A Current-Mode PWM Controllers
General Description
The MIC38HC4x family are fixed frequency current-mode
PWM controllers with 1A drive current capability. Micrel’s
BiCMOS devices are pin-compatible with 384x bipolar de-
vices. Their high output drive, with fast rise and fall times,
combined with low startup current make it an ideal PWM
controller where high efficiency is required.
Undervoltage lockout circuitry allows the ’42 and ’44 versions
to start up at 14.5V and operate down to 9V, and the ’43 and
’45 versions start at 8.4V with operation down to 7.6V. All
versions operate up to 20V.
When compared to bipolar UC384x devices operating from a
15V supply, start-up current has been reduced to 50
μ
A
typical and operating current has been reduced to 4.0 mA
typical. Decreased output rise and fall times drive larger
MOSFETs, and rail-to-rail output capability increases effi-
ciency, especially at lower supply voltages. The MIC38HC4x
also features a trimmed oscillator discharge current and
bandgap reference.
MIC38HC4x-1 is available in 14-pin plastic DIP and SOIC
packages. 8-pin devices feature small size, while 14-pin
devices separate the analog and power connections for
improved performance and power dissipation.
Functional Diagram
Features
Fast 20ns output rise and 15ns output fall times
–40
°
C to +85
°
C temperature range
exceeds UC284x specifications
High-performance, low-power BiCMOS Process
Ultralow start-up current (50
μ
A typical)
Low operating current (4mA typical)
High output drive (1A peak current, HC version)
CMOS outputs with rail-to-rail swing
Current-mode operation up to 500kHz
Trimmed 5V bandgap reference
Pin-for-pin compatible with UC3842/3843/3844/3845(A)
Trimmed oscillator discharge current
UVLO with hysteresis
Low cross-conduction currents
Applications
Current-mode, off-line, switched-mode power supplies
Current-mode, dc-to-dc converters.
Step-down “buck” regulators
Step-up “boost” regulators
Flyback, isolated regulators
Forward converters
Synchronous FET converters
T
Q
S
R
Q
R
2R
Oscillator
UVLO
5V
Reference
VDD
7 (12)
VREF
8 (14)
RT/CT
4 (7)
FB
2 (3)
2.5V
COMP
1 (1)
GND*(AGND)
5 (9)
ISNS
3 (5)
(VD)
(11)
OUT
6 (10)
(PGND)
(8)
( ) pins are on MIC38HC4x-1 (14-lead) versions only
* MIC38HC4x (8-lead) versions only
MIC38HC42, MIC38HC43 (96% max. duty cycle) versions only
MIC38HC44, MIC38HC45 (50% max. duty cycle) versions only
35V
*
*
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com
相關PDF資料 |
PDF描述 |
|---|---|
| MIC38C44-1BM | BiCMOS Current-Mode PWM Controllers |
| MIC38C44-1BN | BiCMOS Current-Mode PWM Controllers |
| MIC38C44BN | FPGA - 200000 SYSTEM GATE 2.5 VOLT - NOT RECOMMENDED for NEW DESIGN |
| MIC38C45BM | BiCMOS Current-Mode PWM Controllers |
| MIC38C45BMM | BiCMOS Current-Mode PWM Controllers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC38C44BMM TR | 功能描述:IC REG CTRLR BST FLYBK ISO 8MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| MIC38C44BN | 功能描述:IC REG CTRLR BST FLYBK ISO 8-DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數:1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| MIC38C44YM | 功能描述:電流型 PWM 控制器 Monolithic SMPS Controller (Lead Free) RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MIC38C44YM TR | 功能描述:電流型 PWM 控制器 Monolithic SMPS Controller (Lead Free) RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| MIC38C44YMM | 功能描述:電流型 PWM 控制器 Monolithic SMPS Controller (Lead Free) RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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