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參數(shù)資料
| 型號(hào)： | MIC2199BML |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 300kHz 4mm 】 4mm Synchronous Buck Converter |
| 中文描述： | SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO12 |
| 封裝： | 4 X 4 MM, MLF-12 |
| 文件頁(yè)數(shù)： | 6/15頁(yè) |
| 文件大?。?/td> | 222K |
| 代理商： | MIC2199BML |
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MIC2199
Block Diagram
Micrel
MIC2199
6
November 2004
G
m
= 0.2
×
10
-3
Current
Limit
V
B
0
V
B
Error
Amp
V
IN
V
DD
P
CORRECTIVE
RESET
Reference
Oscillator
EN/UVLO
2
7
10
HSD
6
BST
12
VSW
11
LSD
8
PGND
9
4
5
3
1
COMP
100k
MIC2199
FB
R2
R1
VOUT
CSH
VDD
C
IN
VIN
Q2
Q1
D1
D2
C
BST
C
OUT
V
IN
V
OUT
L1
C
COMP
R
COMP
4.7
μ
F
A
V
= 2
V
0.8V
R1
R2
OUT
=
+
1
V
6 V
OUT(max)
=
.
0
Current
Sense
Amp
R
CS
Control
Logic
PWM
Figure 1. Internal Block Diagram
Functional Description
The MIC2199 is a BiCMOS, switched-mode, synchronous
step-down (buck) converter controller. Current-mode control
is used to achieve superior transient line and load regulation.
An internal corrective ramp provides slope compensation for
stable operation above a 50% duty cycle. The controller is
optimized for high-efficiency, high-performance DC-DC con-
verter applications.
The MIC2199 block diagram is shown above.
The MIC2199 controller is divided into 5 functions.
Control loop
Current limit
Reference, enable and UVLO
MOSFET gate drive
Oscillator
Control Loop
The MIC2199 operates in PWM (pulse-width-modulation)
mode. In PWM mode, the synchronous buck converter forces
continuous current to flow in the inductor which also improves
cross regulation of transformer coupled, multiple output con-
figurations.
PWM Control Loop
The MIC2199 uses current-mode control to regulate the
output voltage. This method senses the output voltage (outer
loop) and the inductor current (inner loop). It uses inductor
current and output voltage to determine the duty cycle of the
buck converter. Sampling the inductor current removes the
inductor from the control loop, which simplifies compensa-
tion.
A block diagram of the MIC2199 PWM current-mode control
loop is shown in Figure 2 and the PWM mode voltage and
current waveform is shown in Figure 3. The inductor current
is sensed by measuring the voltage across the resistor, R
CS
.
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| MIC2199BML TR | 功能描述:IC REG CTRLR BUCK PWM CM 12-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
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| MIC2199YML EV | 功能描述:電源管理IC開(kāi)發(fā)工具 300KHz 12 Lead Sync Buck Controller - Evaluation Board RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| MIC2199YML TR | 功能描述:DC/DC 開(kāi)關(guān)控制器 300KHz 12 Lead Sync Buck Controller (Lead Free) RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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