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  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP19035 Datasheet

High-Speed Synchronous Buck Controller

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MCP19035 pdf
MCP19035
High-Speed Synchronous Buck Controller
Features:
• Input Voltage Range: from 4.5V to 30V
• Targeted for Low-Voltage Power Trains with
Output Current up to 20A
• High-Speed Voltage Mode, Analog Pulse-Width
Modulation Control
• Power Good Output
• Internal Oscillator, Reference Voltage and
Overcurrent Limit Threshold for Stand-Alone
Applications.
• Multiple Switching Frequency Options (FSW):
- 300 kHz
- 600 kHz
• Integrated Synchronous MOSFET Drivers
• Multiple Dead-Time Options
• Internal Blocking Device for Bootstrap Circuit
• Integrated Current Sense Capability for Short
Circuit Protection
• Internal Overtemperature Protection
• Under Voltage Lockout (UVLO)
• Integrated Linear Voltage Regulator
• 10-LD 3 X 3 mm DFN Package
Applications:
• Point of Loads
• Set-Top Boxes
• DSL Cable Modems
• FPGA’s/DSP’s Power Supply
• PC’s Graphic/Audio Cards
General Description
The MCP19035 is an application-optimized, high-
speed synchronous buck controller that operates from
input voltage sources up to 30V. This controller
implements a voltage-mode control architecture with a
fixed switching frequency of 300 kHz or 600 kHz. The
high-switching frequency facilitates the use of smaller
passive components, including the inductor and
input/output capacitors, allowing a compact, high-
performance power supply solution. The MCP19035
implements an adaptive anti-cross conduction scheme
to prevent shoot-through in the external power
MOSFETs. Furthermore, the MCP19035 offers multiple
dead-time options, enabling an additional degree of
optimization, allowing a higher efficiency power supply
design.
The MCP19035 controller is intended to be used for
applications providing up to 20A of output currents
across a wide input voltage range, up to 30V.
The SHDN input is used to turn the device on and off.
While turned off, the current consumption is minimized.
The MCP19035 offers a Power Good feature
(PWRGD), enabling fault detection and simplifying
sequencing.
Package Types
MCP19035
3x3 DFN*
SHDN 1
FB 2
COMP 3
VIN 4
PWRGD 5
10 HDRV
9 PHASE
EP
11 8 BOOT
7 LDRV
6 +VCC
* Includes Exposed Thermal Pad (EP); see Table 3-1.
2012-2013 Microchip Technology Inc.
DS22326B-page 1



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP19035 Datasheet

High-Speed Synchronous Buck Controller

No Preview Available !

MCP19035 pdf
MCP19035
Typical Application
+ VIN
ON
OFF
MCP19035
SHDN
BOOT
VIN
PWRGD
HDRV
PHASE
COMP
LDRV
C2
C3
R4
FB +VCC
GND
Q1
CBOOT
Q2
CVCC
R1
C1 R3
R2
CIN
L
+VOUT
COUT
DS22326B-page 2
2012-2013 Microchip Technology Inc.



  Microchip Technology Semiconductor Electronic Components Datasheet  

MCP19035 Datasheet

High-Speed Synchronous Buck Controller

No Preview Available !

MCP19035 pdf
MCP19035
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VIN - VGND........................................................ -0.3V to +32V
VBOOT................................................................ -0.3V to +37V
VHDRV, HDRV Pin................. +VPHASE -0.3V to VBOOT+0.3V
VLDRV, LDRV Pin.....................+ (VGND-0.3V) to (VCC+0.3V)
Max. Voltage on Any Pin ...........+ (VGND-0.3V) to (VCC+0.3V)
Storage Temperature ....................................-65°C to +150°C
Maximum Junction Temperature ................................. +150°C
ESD protection on all pins (HBM) .................................... 2 kV
ESD protection on all pins (MM) .....................................200V
† Notice: Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at those or any other conditions above those
indicated in the operational sections of this
specification is not intended. Exposure to maximum
rating conditions for extended periods may affect
device reliability.
DC ELECTRICAL CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, VIN = 12V, FSW = 300 kHz, CIN = 1.0 µF, TA = +25°C (for typical
values), TA = -40°C to +125°C (for minimum and maximum).
Parameters
Symbol Min Typ Max Units
Conditions
Inputs
Input Voltage Range
VIN 4.5 — 30
UVLO (VIN Rising)
UVLOON
4
4.2 4.4
UVLO (VIN Falling)
UVLOOFF
3.4
3.6
3.8
UVLO Hysteresis
UVLOHYST
600
Input Quiescent Current
I(VIN)
—6
8
Shutdown Current
IIN_SHDN
25
50
V
V
V
mV
mA
µA SHDN = GND.
Internal Voltage Regulator is
also disabled
Linear Regulator
Output Voltage
Output Current
Short-Circuit
Output Current
Load Regulation
Line Regulation
Dropout Voltage
Power Supply
Rejection Ratio
VCC
IVCC-OUT
IVCC-OUT_SC
PSRR
4.875
50
5
0.1
0.05
0.75
70
5.125
100
1.3
Internal Oscillator
Switching Frequency
FSW
255 300 345
510 600 690
Ramp Signal Amplitude
VRAMP
0.9
1
1.1
Reference Voltage
Reference Voltage
Generator
VREF
585 600 615
Note 1: Ensured by design. Not production tested.
2: Limited by the maximum power dissipation of the case.
3: Possibility to be adjusted for high volumes.
V 6V VIN < 30V
mA 6.5V VIN < 30V, Note 2
mA VIN = 6V, RLOAD < 0.1
% Note 1
% Note 1
V IVCC_OUT = 50 mA
dB f 1000 Hz,
IVCC_OUT = 50 mA
CIN = 0 µF,
CVCC-OUT = 4.7 µF, Note 1
kHz 2 options, see Section 4.4,
kHz Internal Oscillator
VPP Note 1
mV
2012-2013 Microchip Technology Inc.
DS22326B-page 3




Part Number MCP19035
Description High-Speed Synchronous Buck Controller
Maker Microchip
Total Page 30 Pages
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