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  Microchip Technology Semiconductor Electronic Components Datasheet  

MIC2155 Datasheet

Two-Phase Single-Output PWM Synchronous Buck Control IC

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MIC2155
Two-Phase Single-Output PWM Synchronous Buck Control IC
Features
• Synchronous Buck Control IC with Outputs
Switching 180 Degrees Out of Phase
• Remote Sensing with Internal Differential
Amplifier
• 4.5V-to-14.5V Input Voltage Range
• Adjustable Output Voltages down to 0.7V
• 1% Output Voltage Accuracy
• Starts up into a Pre-biased Output
• 500 kHz PWM Operation
• Adaptive Gate Drive allows Efficiencies of over
95%
• Adjustable Current Limit with no Sense Resistor
• Senses Low-Side MOSFET Current
• Internal Drivers allow 25A per Phase
• Power Good Output allows Simple Sequencing
• Dual Enable Pins with Micro-Power Shutdown
and UVLO
• Programmable Soft-Start Pin
• Output Overvoltage Protection
• Works with Ceramic Output Capacitors
• Multi-Input Supply Capability
• Single-Output High-Current Capability with
Master/Slave Current Sharing
• External Synchronization
• Small Footprint 32-Pin 5 mm × 5 mm VQFN
• Junction Temperature Range of –40°C to +125°C
General Description
The MIC2155 is a two-phase, single-output
synchronous buck control IC that features small size,
high efficiency, and a high level of flexibility. The IC
implements a 500 kHz Voltage mode PWM control with
the outputs switching 180 degrees out of phase. The
result of the out-of-phase operation is 1 MHz (or 600
kHz) input ripple with ripple current cancellation,
minimizing the required input filter capacitance. A 1%
output voltage tolerance allows the maximum level of
system performance. Internal drivers with adaptive
gate drive allow the highest efficiency with the
minimum external components.
Two independent enable pins and a power good output
are provided, allowing a high level of control and
sequencing capability.
The MIC2155 has an operating junction temperature
ranging from –40°C to +125°C.
Data sheets and support documentation can be found
on the Microchip website at www.microchip.com.
Applications
• Multi-Output Power Supplies with Sequencing
• DSP, FPGA, CPU and ASIC Power Supplies
• DSL Modems
• Telecommunications and Networking Equipment
• Servers
Package Type
32-lead 5 mm x 5 mm VQFN
(Top view)
See Table 3-1 for pin information.
BST1
HSD1
SW1
CS1
EN2
SS
COMP1
FB1
32 31 30 29 28 27 26 25
1 24
2 23
3 22
4 21
5 20
6 19
7 EP 18
8 17
9 10 11 12 13 14 15 16
HSD2
SW2
N/C
VIN2
VOUT
COMP2
FB2
EA2+
2019 Microchip Technology Inc.
DS20006106A-page 1


  Microchip Technology Semiconductor Electronic Components Datasheet  

MIC2155 Datasheet

Two-Phase Single-Output PWM Synchronous Buck Control IC

No Preview Available !

MIC2155
Functional Block Diagram
AVDD
(13)
BST1
(1)
FB1
(8)
COMP1
(7)
SS
(6)
E/A1
Band
gap
BG
(700mV)
2uA BG +-
BG +3% +-
BG -3% +-
Rmp1 OutH
Clk1
OC retry
S QSET
R QCLR
Current Limit
HSD1
(2)
Adap
-tive
Drive
200uA
VDD
SW1
(3)
LSD1
(31)
PGND1
(32)
CS1
(4)
VDD
(28)
VIN1
(30)
BG -25% +-
BG +15% +-
BG-10% +-
OV
PG
EN1
VIN1
UVLO
LDO
LOGIC
VDD
UVLO
SYNC
(15)
FB2
(18)
EA2+
(17)
COMP2
(19)
Rmp1
Clk1
Rmp2
Clk2
2 phase
Oscillator
AVDD
E/A2
Gm
Rmp2
Clk2
SS
OutH
S QSET
R QCLR
VIN2
(21)
VIN2
UVLO
VOUT
10mV
EN1
(29)
VIN1
Pre-Bias
Startup
Circuit
VOUT
PGOOD
(16)
VOUT
(20)
DIFFOUT
(9)
RMVOUT
(10)
RMGND
(11)
Adap
-tive
Drive
BS2
(25)
HSD2
(24)
VDD
SW2
(23)
LSD2
(27)
PGND2
(26)
EN2
(5)
AGND
(12)
DS20006106A-page 2
2019 Microchip Technology Inc.


Part Number MIC2155
Description Two-Phase Single-Output PWM Synchronous Buck Control IC
Maker Microchip
Total Page 30 Pages
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