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Micrel Semiconductor

MIC2159 Datasheet Preview

MIC2159 Datasheet

Step-Down Converter IC

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MIC2159
SYNCHRONOUS-itty™ Step-Down
Converter IC
General Description
The MIC2159 is a high efficiency, simple to use
synchronous buck controller ICs housed in a 10-pin MSOP
ePAD package. The MIC2159 switches at 400kHz,
allowing the smallest possible external components and is
designed to drive loads up to 30A. The devices feature
high output driver capability, combined with an all n-
channel synchronous architecture.
The MIC2159 operates from a 3V to 14.5V input and can
be configured to generate output voltages as low as 0.8V.
Efficiencies of over 95% can be achieved within the
smallest possible printed circuit board space area.
The MIC2159 is available in a thermally capable 10-pin
ePAD MSOP package, with a junction operating range
from –40°C to +125°C.
Features
Small footprint 10-lead ePAD MSOP
3V to 14.5V input voltage range
Adjustable output voltage down to 0.8V
400KHz operation
Drives two n-channel MOSFETs
- Built-in 3Ω drivers
Simple control: voltage-mode PWM
Fast transient response
- Externally compensated
Over-current protection
Hiccup mode short-circuit protection
Dual function COMP & EN pin
- ISD = 50µA
Short minimum ON time
- 30ns
- Very low duty cycle possible
Applications
Point-of-Load DC/DC conversion
High Current Power Supplies
Telecom/datacom and Networking Power Supplies
Servers and Workstations
Graphics Cards and other PC Peripherals
___________________________________________________________________________________________________________
Typical Application
MIC2159 Adjustable Output 400kHz Converter
MLF and MicroLead Frame is a registered trademark of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 2009
M9999-030509-B




Micrel Semiconductor

MIC2159 Datasheet Preview

MIC2159 Datasheet

Step-Down Converter IC

No Preview Available !

Micrel, Inc.
Ordering Information
Part Number Output Voltage
MIC2159YMME
Adj
Frequency
400KHz
Juction Temperature Range
-40°C to +125°C
Package
10-pin ePAD MSOP
Pin Configuration
MIC2159
Pin Description
Pin Number
(MSOP-10)
1
2
Pin Name
VIN
VDD
3 CS
4 COMP/EN
5 FB
6 GND
7 LSD
8 VSW
9 HSD
10 BST
10-lead e-PAD MSOP (MME)
Pin Function
Supply voltage (Input): 3V to 14.5V
5V Internal Linear Regulator (Output): VDD is the external MOSFET gate drive supply voltage
and an internal supply bus for the IC. When Vin is 5V, VDD should be connected to Vin.
Current Sense. Current-limit comparator non-inverting input. The current limit is sensed across
the FET during the ON time. The current can be set by the resistor in series with the CS pin.
Compensation (Input): Dual function pin. Pin for external compensation. If this pin is pulled
below 0.2V, with the reference fully up the device shuts down (50μA typical current draw)
Feedback (Input): Input to error amplifier. Regulates error amplifier to 0.8V.
Ground (Return)
Low-Side Drive (Output): High-current driver output for external synchronous MOSFET.
Switch (Return): High-side MOSFET driver return
High-Side Drive (Output): High current output-driver for the high-side MOSFET.
When Vin is below 5v, 2.5v threshold FETs should be used. At Vin > 5V, 4.5V threshold FETs
should be used.
Boost (Input): Provides the drive voltage for the high-side MOSFET driver. The gate drive
voltage is higher than the source voltage by VIN minus a diode drop.
March 2009
2 M9999-030509-B


Part Number MIC2159
Description Step-Down Converter IC
Maker Micrel Semiconductor
Total Page 16 Pages
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