MIC2251_1105 Datasheet, PDF (2/14 Pages) Micrel Semiconductor – High-Efficiency Low EMI Boost Regulator

Micrel, Inc.
MIC2251
Ordering Information
Part Number Marking⁽¹⁾ Junction Temp. Range
Package⁽³⁾
Lead Finish
MIC2251YML
MIC2251-1YD5
MIC2251-2YD5
ADA ⁽²⁾
DZ1⁽²⁾
DZ2⁽²⁾
–40° to +125°C
–40° to +125°C
–40° to +125°C
8-Pin 2mm x 2mm MLF^®
5-Pin Thin SOT-23
5-Pin Thin SOT-23
Pb-Free
Pb-Free
Pb-Free
Note:
1. Pin 1 identifier = “•”.
2. Over/Underbar ( /__ ) may not be to scale.
3. MLF^® is GREEN RoHs compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
8-Pin 2mm x 2mm MLF^® (ML)
(Top View)
5-Pin Thin SOT-23 (D5)
(Top View)
Pin Description
Pin Name
Pin Number
MIC2251YML
FB
1
AGND
2
PGND
3
SW
4
NC
5
VIN
6
DITH
7
EN
8
HS PAD
EP
Pin Number
MIC2251-1YD5
3
―
2
1
―
5
―
4
―
Pin Number
MIC2251-2YD5
3
―
2
1
―
5
4
4
―
Pin Function
Feedback (Input): 1.24V output voltage sense node.
V_OUT = 1.24V (1 + R1/R2)
Analog Ground. Connect to power ground.
Power Ground.
Switch Node (Input): Internal power NMOS drain.
Not Internally Connected.
Supply (Input): 2.5V to 5.5V input voltage.
Frequency Dithering (Input): Connect this pin high to
enable pseudo-random on-time dithering to reduce EMI.
Connect this pin-to-ground to disable this function.
Enable (Input): Logic high enables the regulator. Logic
low shuts down the regulator. Do not leave floating.
Ground (Return): Exposed backside pad. Connect to
power ground.
April 2011
2
M9999-041811-B