MIC2164-3YMM Micrel Inc, MIC2164-3YMM Datasheet - Page 3

• Manufacturer Part Number: MIC2164-3YMM
• Description: IC PWM BUCK CNTLLR 10MSOP
• Manufacturer: Micrel Inc
• Series: Hyper Speed Control™r
• Type: Step-Down (Buck)r

Specifications of MIC2164-3YMM

• Internal Switch(s): No
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 0.8 ~ 5.5 V
• Frequency - Switching: 1MHz
• Voltage - Input: 3 ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Voltage - Supply: 3 V ~ 28 V
• Frequency-max: 1.25MHz
• Duty Cycle: 66%
• Pwm Type: Controller
• Buck: Yes
• Boost: No
• Flyback: No
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3544-5

Micrel, Inc.
MIC2164/-2/-3/C
Pin Description (Continued)
Pin Number
Pin Name
Pin Function
Switch Node and Current Sense input: High current output driver return. The LX pin connects directly
to the switch node. Due to the high speed switching on this pin, the LX pin should be routed away from
9
LX
sensitive nodes. LX pin also senses the current by monitoring the voltage across the low-side
MOSFET during OFF time. In order to sense the current accurately, connect the low-side MOSFET
drain to LX using a Kelvin connection.
Boost (output): Bootstrapped voltage to the high-side N-channel MOSFET driver. A Schottky diode is
connected between the IN pin and the BST pin. A boost capacitor of 0.1μF is connected between the
10
BST
BST pin and the LX pin. Adding a small resistor in series with the boost capacitor can slow down the
turn-on time of high-side N-Channel MOSFETs.
3
September 2010
M9999-091310-D