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參數(shù)資料
| 型號(hào)： | MIC2185 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Low Voltage Synchronous Boost PWM Control IC |
| 中文描述： | 低電壓同步升壓PWM控制IC |
| 文件頁數(shù)： | 7/15頁 |
| 文件大?。?/td> | 141K |
| 代理商： | MIC2185 |
May 2002
7
MIC2185
MIC2185
Functional Diagram
Micrel
Osc
Error
Amplifier
0.1V
P
GND
Q2
Q1
L1
fs/4
V
IN
Control
Bias
PWM
Comparator
V
REF
V
REF
100k
V
DD
S
GND
Overcurrent
Comparator
Frequency
Foldback
fs/4
R
Overcurrent Reset
CRamp
On
Gain = 3.7
PGND
12
CSH
9
OUTN
13
V
IN
P
16
V
IN
A
1
FB
6
5
SGND
VDD
10
VREF
8
COMP
4
SS
3
SYNC
11
FREQ/2
15
SKIP
2
EN/UVLO
7
gGain = 20
0.3V
R2
R1
R
SENSE
C
OUT
V
OUT
P
GND
V
REF
C
IN
C
DECOUP
V
DD
P
GND
OUTP
14
D1
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
output diode, D1, improves the efficiency of the boost con-
verter. The lower voltage drop across the MOSFET reduces
power dissipation and increases efficiency. Current mode
control is used to achieve superior transient line and load
regulation. An internal corrective ramp provides slope com-
pensation for stable operation above a 50% duty cycle. The
controller is optimized for high efficiency, high performance
DC-DC converter applications.
Figure 1 is a block diagram of the MIC2185 configured 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 flows through the current sense resistor,
Rsense. The voltage across the resistor is amplified and
combined with an internal ramp for stability. This signal is
compared with the comp output signal of the error amplifier.
When the current signal equals the error voltage signal, the
low side MOSFET is turned off. The inductor current then
flows 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
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| MIC2185BM | Low Voltage Synchronous Boost PWM Control IC |
| MIC2185BQS | Low Voltage Synchronous Boost PWM Control IC |
| MIC2193 | 400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC |
| MIC2193BM | 400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2185_05 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Low Voltage Synchronous Boost PWM Control IC |
| MIC2185BM | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC 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 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) |
| MIC2185BM TR | 功能描述:IC REG CTRLR BST PWM CM 16-SOIC 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 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) |
| MIC2185BQS | 功能描述:IC REG CTRLR BST PWM CM 16-QSOP 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 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) |
| MIC2185BQS TR | 功能描述:IC REG CTRLR BST PWM CM 16-QSOP 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 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) |
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