Series: -
Number of Outputs: 1
Voltage - Input: 3 V ~ 40 V
Frequency - Switching: 100kHz
Synchronous Rectifier: No
Operating Temperature: -40°C ~ 85°C
Mounting Type: Through Hole
Package / Case: 8-DIP (0.300", 7.62mm)
Packaging: Tube
Supplier Device Package: 8-PDIP
PWM Type: Current Mode
Output Type: -
Voltage - Output: -
Manufacturer: Micrel Inc
Current - Output: 1.25A
Type: Step-Down (Buck), Step-Up (Boost), Inverting, Cuk
Features: •1.25A, 65V internal switch rating
•3V to 40V input voltage range
•Current-mode operation
•Internal cycle-by-cycle current limit
•Thermal shutdown
•Low external parts count
•Operates in most switching topologies
•7mA quiescent current (operating)
•<1µA quiescent current, shutdown mode (MIC3172)
•TTL shutdown compatibility (MIC3172)
•External frequency synchronization (MIC2172)
•External frequency trim (MIC2172)
•Fits most LT1172 sockets (see applications info)Application•Laptop/palmtop computers
•Toys
•Hand-held instruments
•Off-line converter up to 50W (requires external power switch)
•Predriver for higher power capability
•Master/slave configurations (MIC2172)
Pinout
SpecificationsInput Voltage .......................................................40V
Switch Voltage .....................................................65V
Sync Current ..........................................................50mA
Feedback Voltage (Transient, 1ms) ................. ..... ±15V
Operating Temperature Range
8-pin PDIP................................................. 40 to +85°C
8-pin SOIC ................................................ 40 to +85°C
Junction Temperature ......................... 55°C to +150°C
Thermal Resistance
qJA 8-pin PDIP .................................................130°C/W
qJA 8-pin SOIC .................................................120°C/W
Storage Temperature ....................... ... 65°C to +150°C
Soldering (10 sec.) .............................................. +300°C
Description The MIC2172 and MIC3172 are complete 100kHz SMPS current-mode controllers with internal 65V 1.25A power switches. The MIC2172 features external frequency syn-chronization or frequency adjustment, while the MIC3172 features an enable/shutdown control input. Although primarily intended for voltage step-up applications,
the floating switch architecture of the MIC2172/3172 makes it practical for step-down, inverting, and Cuk configurations as well as isolated topologies.Operating from 3V to 40V, the MIC2172/3172 draws only 7mA of quiescent current making it attractive for battery operated supplies.
The MIC2172 is for applications requiring two or more SMPS regulators that operate from the same input supply. The MIC2172 features a SYNC input which allows locking of its internal oscillator to an external reference. This makes it possible to avoid the audible beat frequencies that result from the unequal oscillator frequencies of independent SMPS regulators.
A reference signal can be supplied by one MIC2172 desig-nated as a master. To insure locking of the slave's oscillators,the reference oscillator frequency must be higher than the slave's. The master MIC2172's oscillator frequency is in-creased up to 135kHz by connecting a resistor from SYNC to ground (see applications information).
The MIC2172/3172 is available in an 8-pin plastic DIP or SOIC for 40°C to +85°C operation.
Parameters: | Technical/Catalog Information | MIC2172BN |
| Vendor | Micrel Inc |
| Category | Integrated Circuits (ICs) |
| Type | Step-Down (Buck), Step-Up (Boost), Inverting, Cuk |
| Number of Outputs | 1 |
| Voltage - Input | 3 ~ 40 V |
| Voltage - Output | - |
| Current - Output | 1.25A |
| Power - Output | 302mW |
| Package / Case | 8-DIP |
| Packaging | Tube |
| Internal Switch(s) | Yes |
| Synchronous | Yes |
| Rds (On) | - |
| Operating Temperature | -40°C ~ 85°C |
| Frequency - Switching | 100kHz |
| Lead Free Status | Contains Lead |
| RoHS Status | RoHS Non-Compliant |
| Other Names | MIC2172BN
MIC2172BN
|
MIC2172BN Data Sheet
