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參數(shù)資料
| 型號： | MIC3172YN |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 3.5 A SWITCHING REGULATOR, 115 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 2/17頁 |
| 文件大小： | 153K |
| 代理商： | MIC3172YN |
MIC2172/3172
Micrel, Inc.
M9999-042205
2
April 2005
Ordering Information
Part Number
Standard
MIC2172BN
MIC2172BM
MIC3172BN
MIC3172BM
Temperature
Range
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
–40
°
C to +85
°
C
Pb-Free
MIC2172YN
MIC2172YM
MIC3172YN
MIC3172YM
Package
8-pin plastic DIP
8-lead SOIC
8-pin plastic DIP
8-lead SOIC
8-lead SOIC (M)
1
2
3
4
S GND
COMP
P GND 1
V
SW
P GND 2
FB
*SYNC/
EN
V
I N
8
7
6
5
MIC2172*/3172
Pin Configuration
1
2
3
4
S GND
COMP
P GND 1
FB
*SYNC/
EN
V
SW
P GND 2
V
I N
8
7
6
5
MIC2172*/3172
Pin Description
Pin Number
Pin Name
S GND
Pin Function
Signal Ground: Internal analog circuit ground. Connect directly to the input
filter capacitor for proper operation (see applications info). Keep separate
from power grounds.
Frequency Compensation: Output of transconductance type error amplifier.
Primary function is for loop stabilization. Can also be used for output voltage
soft-start and current limit tailoring.
Feedback: Inverting input of error amplifier. Connect to external resistive
divider to set power supply output voltage.
Synchronization/Frequency Adjust: Capacitively coupled input signal greater
than device’s free running frequency (up to 135kHz) will lock device’s
oscillator on falling edge. Oscillator frequency can be trimmed up to 135kHz
by adding a resistor to ground. If unused, pin must float (no connection).
Enable: Apply TTL high or connect to V
to enable the regulator. Apply
TTL low or connect to ground to disable the regulator. Device draws only
leakage current (<1
μ
A) when disabled.
Supply Voltage: 3.0V to 40V
Power Ground #2: One of two NPN power switch emitters with 0.3
current
sense resistor in series. Required. Connect to external inductor or input
voltage ground depending on circuit topology.
Power Switch Collector: Collector of NPN switch. Connect to external
inductor or input voltage depending on circuit topology.
Power Ground #1: One of two NPN power switch emitters with 0.3
current
sense resistor in series. Optional. For maximum power capability connect
to P GND 2. Floating pin reduces current limit by a factor of two.
1
2
COMP
3
FB
4 (MIC2172)
SYNC
4 (MIC3172)
EN
5
6
V
IN
P GND 2
7
V
SW
8
P GND 1
8-pin DIP (N)
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