MIC27600 Datasheet PDF - MICREL

www.Datasheet-PDF.com

MIC27600
MICREL

Part Number MIC27600
Description 36V / 7A Hyper Speed Control Synchronous DC-DC Buck Regulator
Page 27 Pages


MIC27600 datasheet pdf
Download PDF
MIC27600 pdf
View PDF for Mobile


No Preview Available !

MIC27600
36V, 7A Hyper Speed Control
Synchronous DC-DC Buck Regulator
SuperSwitcher II
General Description
Features
The Micrel MIC27600 is a constant-frequency, synchronous
buck regulator featuring a unique digitally modified adaptive
on-time control architecture. The MIC27600 operates over an
input supply range of 4.5V to 36V and provides a regulated
output of up to 7A of output current. The output voltage is
adjustable down to 0.8V with a guaranteed accuracy of ±1%,
and the device operates at a switching frequency of 300kHz.
Micrel’s Hyper Speed Controlarchitecture allows for ultra-
fast transient response while reducing the output capacitance
and also makes (High VIN)/(Low VOUT) operation possible.
This digitally modified adaptive tON ripple control architecture
combines the advantages of fixed-frequency operation and
fast transient response in a single device.
The MIC27600 offers a full suite of protection features to
ensure protection of the IC during fault conditions. These
include undervoltage lockout to ensure proper operation
under power-sag conditions, internal soft-start to reduce
inrush current, foldback current limit, “hiccup” mode short-
circuit protection and thermal shutdown.
All support documentation can be found on Micrel’s web
site at: www.micrel.com.
Hyper Speed Controlarchitecture enables
- High Delta V operation (VIN = 36V and VOUT = 0.8V)
- Small output capacitance
4.5V to 36V voltage input
Adjustable output from 0.8V to 5.5V (VHSD 28V)
Adjustable output from 0.8V to 3.6V (VHSD 36V)
±1% FB accuracy
Any CapacitorStable - Zero-ESR to high-ESR
7A output current capability, up to 95% efficiency
300kHz switching frequency
Internal compensation, 6ms Internal soft-start
Foldback current-limit and “hiccup” mode short-circuit
protection
Thermal shutdown
Supports safe startup into a pre-biased load
–40°C to +125°C junction temperature range
28-pin 5mm × 6mm MLF® package
Applications
Distributed power systems
Communications/networking infrastructure
Set-top box, gateways and routers
Printers, scanners, graphic cards and video cards
___________________________________________________________________________________________________________
Typical Application
www.DataSheet4U.com
Efficiency (VIN = 28V)
vs. Output Current
95
5.0V
90 3.3V
2.5V
85
1.8V
80
1.5V
1.2V
1.0V
75 0.9V
0.8V
70
65
60
0123456789
OUTPUT CURRENT (A)
Hyper Speed Control, SuperSwitcher II and Any Capacitor are trademarks of Micrel, Inc.
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
October 2010
M9999-101310



No Preview Available !

Micrel, Inc.
MIC27600
Ordering Information
Part Number Voltage Switching Frequency Junction Temperature Range
Package
MIC27600YJL Adjustable
300kHz
40°C to +125°C
28-pin 5mm × 6mm MLF®
Lead Finish
Pb-Free
Pin Configuration
28-Pin 5mm × 6mm MLF® (YJL)
Pin Description
Pin
Number
13, 14, 15,
16, 17, 18,
19
Pin Name
PVIN
24 EN
25 FB
26 SGND
27 VDD
2, 5, 6, 7,
8, 21
PGND
22 CS
www.DataSheet4U.com
Pin Function
High-Side N-internal MOSFET Drain Connection (Input): The PVIN operating voltage range is from
4.5V to 36V. Input capacitors between the PVIN pins and the power ground (PGND) are required and
keep the connection short.
Enable (Input): A logic level control of the output. The EN pin is CMOS-compatible. Logic high or
floating = enable, logic low = shutdown. In the off state, the VDD supply current of the device is
reduced (typically 0.7mA). Do not pull the EN pin above the VDD supply.
Feedback (Input): Input to the transconductance amplifier of the control loop. The FB pin is regulated
to 0.8V. A resistor divider connecting the feedback to the output is used to adjust the desired output
voltage.
Signal ground. SGND must be connected directly to the ground planes. Do not route the SGND pin to
the PGND Pad on the top layer, see PCB layout guidelines for details.
VDD Bias (Input): Power to the internal reference and control sections of the MIC27600. The VDD
operating voltage range is from 4.5V to 5.5V. A 2.2µF ceramic capacitor from the VDD pin to the
PGND pin must be placed next to the IC. VDD must be powered up at the same time or after VIN to
make the soft-start function correctly.
Power Ground. PGND is the ground path for the MIC27600 buck converter power stage. The PGND
pin connects to the sources of low-side N-Channel internal MOSFETs, the negative terminals of input
capacitors, and the negative terminals of output capacitors. The loop for the power ground should be
as small as possible and separate from the signal ground (SGND) loop.
Current Sense (Input): High current output driver return. The CS pin connects directly to the switch
node. Due to the high-speed switching on this pin, the CS pin should be routed away from sensitive
nodes. CS pin also senses the current by monitoring the voltage across the low-side internal
MOSFET during OFF-time.
October 2010
2 M9999-101310



No Preview Available !

Micrel, Inc.
MIC27600
Pin Description (Continued)
Pin
Number
20
4, 9, 10,
11, 12
23
1, 3, 28
Pin Name
BST
SW
VIN
NC
Pin Function
Boost (Output): Bootstrapped voltage to the high-side N-channel internal MOSFET driver. A Schottky
diode is connected between the VDD pin and the BST pin. A boost capacitor of 0.1μF is connected
between the BST pin and the SW pin.
Switch Node (Output): Internal connection for the high-side MOSFET source and low-side MOSFET
drain.
Power Supply Voltage (Input): Requires bypass capacitor to SGND.
No Connect.
www.DataSheet4U.com
October 2010
3
M9999-101310



No Preview Available !

Micrel, Inc.
MIC27600
Absolute Maximum Ratings(1, 2)
PVIN to PGND................................................ 0.3V to +38V
VIN to PGND ....................................................0.3V to PVIN
VDD to PGND ................................................... 0.3V to +6V
VSW, VCS to PGND .............................. 0.3V to (PVIN +0.3V)
VBST to VSW ........................................................ 0.3V to 6V
VBST to PGND .................................................. 0.3V to 44V
VEN to PGND ...................................... 0.3V to (VDD + 0.3V)
VFB to PGND....................................... 0.3V to (VDD + 0.3V)
PGND to SGND ........................................... 0.3V to +0.3V
Junction Temperature .............................................. +150°C
Storage Temperature (TS).........................65°C to +150°C
Lead Temperature (soldering, 10sec)........................ 260°C
Operating Ratings(3)
Supply Voltage (PVIN, VIN)................................. 4.5V to 36V
Bias Voltage (VDD)............................................ 4.5V to 5.5V
Enable Input (VEN) ................................................. 0V to VDD
Junction Temperature (TJ) ........................ 40°C to +125°C
Maximum Power Dissipation......................................Note 4
Package Thermal Resistance(4)
5mm x 6mm MLF® (θJA) ....................................36°C/W
Electrical Characteristics(5)
PVIN = VIN = 12V, VDD = 5V; VBST – VSW = 5V; TA = 25°C, unless noted. Bold values indicate 40°C TJ +125°C.
Parameter
Condition
Min.
Typ.
Power Supply Input
Input Voltage Range (VIN, PVIN)
4.5
VDD Bias Voltage
Operating Bias Voltage (VDD)
Under-Voltage Lockout Trip Level
UVLO Hysteresis
VDD Rising
4.5
2.4
Quiescent Supply Current
Shutdown Supply Current
VFB = 1.5V
VDD = VBST = 5.5V, VIN = 36V
SW = unconnected, VEN = 0V
Reference
Feedback Reference Voltage
Load Regulation
Line Regulation
FB Bias Current
0°C TJ 85°C (±1.0%)
40°C TJ 125°C (±1.5%)
IOUT = 0A to 7A
VIN = (VOUT + 3.0V) to 36V
VFB = 0.8V
0.792
0.788
DC-DC Converter
Output Voltage Range
3.0V VHSD 28V
3.0V VHSD 36V
0.8
0.8
Enable Control
EN Logic Level High
EN Logic Level Low
EN Bias Current
4.5V < VDD < 5.5V
4.5V < VDD < 5.5V
VEN = 0V
1.2
Notes:
ww1. wE.DxcaeteadSihngeetth4eUa.bcsoomlute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5kin series with 100pF.
3. The device is not guaranteed to function outside operating range.
4. PD(MAX) = (TJ(MAX) – TA)/ θJA, where θJA depends upon the printed circuit layout. See “Applications Information.”
5. Specification for packaged product only.
5
2.7
50
1.4
0.7
0.8
0.8
0.2
0.1
5
0.85
0.78
50
Max.
36
5.5
3.2
3
2
0.808
0.812
5.5
3.6
0.4
Units
V
V
V
mV
mA
mA
V
%
%
nA
V
V
V
µA
October 2010
4 M9999-101310



MIC27600 datasheet pdf
Download PDF
MIC27600 pdf
View PDF for Mobile


Related : Start with MIC2760 Part Numbers by
MIC27600 36V / 7A Hyper Speed Control Synchronous DC-DC Buck Regulator MIC27600
MICREL
MIC27600 pdf

Index :   0   1   2   3   4   5   6   7   8   9   A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z   

This is a individually operated, non profit site. If this site is good enough to show, please introduce this site to others.
Since 2010   ::   HOME   ::   Contact