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| 型号： | MIC2185BQS |
| 厂商： | Micrel Inc |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 16-QSOP |
| 标准包装： | 98 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 95% |
| 电源电压： | 2.9 V ~ 14 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
MIC2185
Functional Diagram
V IN
C IN
Micrel, Inc.
C DECOUP
1
V IN A
V IN P
L1
EN/UVLO
7
SKIP
2
fs/4
Control
Bias
On
Overcurrent Reset
V REF
V DD
P GND
16
OUTP
14
D1
Q2
C OUT
V OUT
FREQ/2
15
OUTN
13
Q1
SYNC
11
Osc
PWM
Comparator
0.1V
P GND
Correction
Ramp
SS
3
Overcurrent
Comparator
CSH
9
COMP
4
Error
Amplifier
gm = 0.0002
Gain = 20
V REF
Gain = 3.7
P GND
PGND
12
R SENSE
100k
0.3V
VREF
8
VDD
10
V REF
V DD
fs/4
Frequency
Foldback
FB
6
R1
R2
S GND
SGND
5
Figure 1. MIC2185 PWM Mode Block Diagram
Functional Description
The MIC2185 is a BiCMOS, switched mode, synchronous
boost (step up) control IC. The synchronous switched, high
side P-channel MOSFET, Q2, placed in parallel with the out-
put diode, D1, improves the ef?ciency of the boost converter.
The lower voltage drop across the MOSFET reduces power
dissipation and increases ef?ciency. 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 ef?ciency, high performance DC-DC
converter applications.
Figure 1 is a block diagram of the MIC2185 con?gured as
a PWM synchronous boost converter. The switching cycle
starts when OutN goes high and turns on the low side, N-
channel MOSFET, Q1. The Vgs of the MOSFET is equal to
VinP. This forces current to ramp up in the inductor. The
inductor current ?ows through the current sense resistor,
Rsense. The voltage across the resistor is ampli?ed and
combined with an internal ramp for stability. This signal is
compared with the comp output signal of the error ampli?er.
When the current signal equals the error voltage signal, the
low side MOSFET is turned off. The inductor current then
?ows through the diode, D1, to the output. A delay between
the turn-off of the low side MOSFET and the turn-on of the
high side MOSFET prevents both MOSFETs from being on
at the same time, which would short the output to ground.
At the end of the non-overlap time, OutP pulls the gate of
the MOSFET to ground, turning on the high side, P-channel
October 2005
7
MIC2185
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2185BQS TR | 功能描述:IC REG CTRLR BST PWM CM 16-QSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC2185YM | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (Lead Free) RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MIC2185YM TR | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (Lead Free) RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MIC2185YQS | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (Lead Free) RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MIC2185YQS TR | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (Lead Free) RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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