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Buck Regulator. MIC4782 Datasheet

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Buck Regulator. MIC4782 Datasheet






MIC4782 Regulator. Datasheet pdf. Equivalent




MIC4782 Regulator. Datasheet pdf. Equivalent





Part

MIC4782

Description

1.8 MHz Dual 2A Integrated Switch Buck Regulator



Feature


.
Manufacture

MICREL

Datasheet
Download MIC4782 Datasheet


MICREL MIC4782

MIC4782; .


MICREL MIC4782

.


MICREL MIC4782

.

Part

MIC4782

Description

1.8 MHz Dual 2A Integrated Switch Buck Regulator



Feature


.
Manufacture

MICREL

Datasheet
Download MIC4782 Datasheet




 MIC4782
MIC4782
1.8 MHz Dual 2A Integrated Switch
Buck Regulator
General Description
The Micrel MIC4782 is a high efficiency dual PWM buck
(step-down) regulator that provides dual 2A output current.
The MIC4782 operates at 1.8MHz. A proprietary internal
compensation technique allows a closed loop bandwidth of
over 200kHz.
The low on-resistance internal P-Channel MOSFET of the
MIC4782 allows efficiencies over 92%, reduces external
components count and eliminates the need for an
expensive current sense resistor.
The MIC4782 operates from 3.0V to 6.0V input and the
output can be adjusted down to 0.6V. The device can
operate with a maximum duty cycle of 100% for use in low-
dropout conditions.
The MIC4782 is available in the exposed pad 16-pin
3mm x 3mm MLF® with a junction operating range from
–20°C to +125°C.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Typical Application
Features
3.0 to 6.0V supply voltage
1.8MHz PWM mode
2A dual output
Greater than 92% efficiency
100% maximum duty cycle
Adjustable output voltage option down to 0.6V
Ultra-fast transient response
Ultra-small external components
Stable with a 1µH inductor and a 4.7µF output
capacitor
Fully integrated 2A MOSFET switches
Micro-power shutdown
Thermal shutdown and current limit protection
Available in a 3mm × 3mm 16-pin MLF®
–20°C to +125°C junction temperature range
Applications
Broadband: xDSL modems
Automotive satellite radios
HD STB, DVD/TV recorder
Computer peripherals: printers and graphic cards
FPGA/ASIC
General point-of-load
2A, 1.8MHz Dual Buck Regulator
5.0VIN, 3.3VOUT Efficiency
100
98
96
94
92
90
88
86
84
82
80
0
0.4 0.8 1.2 1.6
OUTPUT CURRENT (A)
2
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
August 2009
1 M9999-081709-D




 MIC4782
Micrel, Inc.
Ordering Information
Part Number
MIC4782YML
Voltage
Adj.
Junction Temp. Range
Package
–20° to +125°C
16-Pin 3mm x 3mm MLF®
Note:
MLF® is a GREEN RoHS-compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
MIC4782
Lead Finish
Pb-Free
Pin Configuration
16-Pin 3mm x 3mm MLF® (YML)
August 2009
2 M9999-081709-D




 MIC4782
Micrel, Inc.
MIC4782
Pin Description
Pin Number
1
Pin Name
FB2
2(1) EN2
3,4 SW2
5 PGND2
6,15 VIN2
7,14 VIN1
8 PGND1
9,10
11(1)
SW1
EN1
12 FB1
13 SGND
16 BIAS
EPAD
GND
Note:
1. Do not float Enable Input.
Pin Function
Feedback for output 2 (Input). Input to the error amplifier, connect to the external resistor
divider network to set the output voltage.
Enable for output 2 (Input). Logic level low, will shutdown the device, reducing the current
draw to 1.6µA typical. (both EN1 and EN2 are low).
Switch for output 2 (Output): Internal power P-Channel MOSFET output switch
Power Ground for output 2. Provides the ground return path for the high-side drive current.
PGND1 pin and PGND2 pin are internally connected by anti-parallel diodes.
Supply Voltage for output 2 (Input): Supply voltage for the source of the internal P-channel
MOSFET and driver. Requires bypass capacitor-to-GND.
VIN1 pins and VIN2 pins are internally connected by anti-parallel diodes.
Supply Voltage for output 1 (Input): Supply voltage for the source of the internal P-channel
MOSFET and driver. Requires bypass capacitor-to-GND.
VIN1 pins and VIN2 pins are internally connected by anti-parallel diodes.
Power Ground for output 1. Provides the ground return path for the high-side drive
current.
PGND1 pin and PGND2 pin are internally connected by anti-parallel diodes.
Switch for output 1 (Output): Internal power P-Channel MOSFET output switch
Enable for output 1 (Input). Logic level low, will shutdown the device, reducing the current
draw to 1.6µA typical. (both EN1 and EN2 are low).
Feedback for output 1 (Input). Input to the error amplifier, connect to the external resistor
divider network to set the output voltage.
Signal (Analog) Ground. Provides return path for control circuitry and internal reference.
Internal circuit bias supply. Must be bypassed with a 0.1µF ceramic capacitor-to-SGND.
Biased through a 10resistor to VIN.
Connect to ground.
August 2009
3 M9999-081709-D



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