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Buck Converter. MIC2199 Datasheet |
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Micrel, Inc.
MIC2199
MIC2199
300kHz 4mm × 4mm Synchronous Buck Converter
General Description
The MIC2199 is a high-power 300kHz synchronous buck
DC-to-DC controller housed in a small 4mm × 4mm MLF™
12-pin package. The MIC2199 operates from a wide 4.5V
to 32V input and can be programmed for output voltages
from 0.8V to 6V. The wide input voltage capability makes
the MIC2199 an ideal solution for point-of-load DC-to-DC
conversion in 5V, 12V, 24V, and 28V systems.
The 300kHz switching frequency allows the use of a small
inductor and small output capacitors. The current mode PWM
control along with the external COMP pin allows for ease of
stability compensation and fast transient response across a
wide range of applications.
An all N-Channel synchronous architecture and powerful
output drivers allow up to 20A of output current capability.
For smaller external components, refer to the 500kHz
MIC2198.
The MIC2199 is available in a 12-pin 4mm × 4mm MLF™
package with a junction temperature range from –40°C to
125°C.
Features
• 4.5V to 32V input range
• 4mm × 4mm MLF™ package
• 300kHz PWM operation
• 95% efficiency
• Output voltage adjustable down to 0.8V
• 20A output current capability
• Drives all N-Channel MOSFETs
• Logic controlled micropower shutdown
• Cycle-by-cycle current limiting
• Adjustable undervoltage lockout
• Frequency foldback overcurrent protection
Applications
• Point-of-load DC-to-DC conversion from 5V, 12V,
24V, 28V supplies
• Telecom equipment
• Wireless modems
• Servers
• Base stations
Typical Application
4.5VVtoIN 24V
22µF
2kΩ
2.2nF
U1 MIC2199BML
VIN VDD
SD103BWS
4.7µF
EN/UVLO
BST
HSD
VSW
LSD
0.1µF
IRF7821
2µH
IRF7821
COMP
CSH
VOUT
1nF
GND
FB
0.01Ω
3.V3VOU/7T A
220µF
10kΩ
6.04kΩ
4.5V–24V to 3.3V/7A Converter
100.0
95.0
90.0
85.00
VOUT = 3.3V
2 46
ILOAD (A)
8
Efficiency for
VIN = 5V and VOUT = 3.3V
MLF and MicroLeadFrame are registered trademarks 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
January 2010
1 M9999-011310
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Micrel, Inc.
Ordering Information
Part Number
Standard
Pb-Free
MIC2199BML MIC2199YML
Voltage
Adj
Temperature Range
−40ºC to +125ºC
Package
12-Pin 4x4 MLF®
MIC2199.
Pin Configuration
COMP
EN/UVLO
FB
CSH
VOUT
VIN
1
2
3
4
5
6
12 HSD
11 VSW
10 BST
9 GND
8 LSD
7 VDD
12-Pin 4×4 MLF® (ML)
Pin Description
Pin Number
1
2
Pin Name
COMP
EN/UVLO
3
4
FB
CSH
5
6
7
8
9
10
11
12
VOUT
VIN
VDD
LSD
GND
BST
VSW
HSD
Pin Function
Compensation (Output): Internal error amplifier output. Connect to capacitor
or series RC network to compensate the regulator control loop.
Enable/Undervoltage Lockout (Input): Low-level signal powers down the
controller. Input below the 2.5V threshold disables switching and functions as
an accurate undervoltage lockout (UVLO). Input below the threshold forces
complete micropower (<0.1µA) shutdown.
Feedback (Input): Regulates FB pin to 0.8V. See “Applications Information”
for resistor divider calculations.
Current-Sense High (Input): Current limit comparator non-inverting input. A
built-in offset of 100mV between CSH and VOUT pins in conjunction with the
current-sense resistor set the current limit threshold level. This is also the
non-inverting input to the current sense amplifier.
Current-Sense Low (Input): Output voltage feedback input and inverting
input for the current limit comparator and the current sense amplifier.
Unregulated Input (Input): +4.5V to +32V supply input.
5V Internal Linear-Regulator (Output): VDD is the external MOSFET gate
drive supply voltage and internal supply bus for the IC. Bypass to GND with
4.7µF.
Low-Side Drive (Output): High-current driver output for low-side N-Channel
MOSFET. Voltage swing is between ground and VDD.
Ground (Return).
Boost (Input): Provides drive voltage for the high-side MOSFET driver. The
drive voltage is higher than the input voltage by VDD minus a diode drop.
Switch (Return): High-side MOSFET driver return.
High-Side Drive (Output): High-current driver output for high-side MOSFET.
This node voltage swing is between ground and VIN +5V minus a diode drop.
January 2010
2 M9999-011310
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