Buck Regulator. MIC23254 Datasheet

MIC23254 Regulator. Datasheet pdf. Equivalent

MIC23254 Datasheet
Recommendation MIC23254 Datasheet
Part MIC23254
Description 4MHz Dual 400mA Synchronous Buck Regulator
Feature MIC23254; MIC23254 4MHz Dual 400mA Synchronous Buck Regulator with Low Input Voltage and HyperLight Load™ Gen.
Manufacture Micrel Semiconductor
Datasheet
Download MIC23254 Datasheet




Micrel Semiconductor MIC23254
MIC23254
4MHz Dual 400mA Synchronous Buck
Regulator with Low Input Voltage and
HyperLight Load™
General Description
Features
The MIC23254 is a low-input voltage, high-efficiency 4MHz
dual 400mA synchronous buck regulator with HyperLight
Load™ mode. HyperLight Load™ provides very-high
efficiency at light loads and ultra-fast transient response
which is perfectly suited for supplying processor core
voltages. An additional benefit of this proprietary
architecture is very-low output ripple voltage throughout
the entire load range with the use of small output
capacitors. MIC23254 operates from an input voltage
down to 2.5V for low battery states. The MIC23254 has a
tiny 2mm x 2mm Thin MLF® package that saves precious
board space by requiring only 6 additional external
components to drive both outputs up to 400mA each.
The device is designed for use with a 1µH inductor and a
4.7µF output capacitor that enables a sub-1mm height.
The MIC23254 has a very-low quiescent current of 33µA
with both outputs enabled and can achieve over 85%
efficiency at 1mA. At higher loads the MIC23254 provides a
constant switching frequency around 4MHz while providing
peak efficiencies over 90%.
The MIC23254 fixed output voltage option is available in a
10-pin 2mm x 2mm Thin MLF®. The MIC23254 is designed
to operate over the junction operating range from –40°C to
+125°C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Low input voltage range: 2.5V to 5.5V
Dual output current 400mA/400mA
Up to 94% peak efficiency and 85% efficiency at 1mA
33µA dual quiescent current
1µH inductor with a 4.7µF capacitor
4MHz in PWM operation
Ultra-fast transient response
Low voltage output ripple
20mVpp in HyperLight Load™ mode
3mV output voltage ripple in full PWM mode
0.01µA shutdown current
Fixed output:10-pin 2mm x 2mm Thin MLF®
–40°C to +125°C junction temperature range
Applications
Mobile handsets
Portable media players
Portable navigation devices (GPS)
WiFi/WiMax/WiBro modules
Digital cameras
Wireless LAN cards
USB Powered Devices
____________________________________________________________________________________________________________
Typical Application
Efficiency
VOUT = 1.8V
100
90 VIN = 3.0V
80
70
60 VIN = 2.7V
50
VIN = 3.6V
40 VIN = 4.2V
30
20
10
0
1
L = 1µH
COUT = 4.7µF
10 100 1000
LOAD (mA)
HyperLight Load is a trademark 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
May 2010
M9999-052510



Micrel Semiconductor MIC23254
Micrel, Inc.
MIC23254
Ordering Information
Part Number
MIC23254-GCYMT
Marking
Code
GCW
Nominal
Output
Voltage 1
1V
Nominal
Output
Voltage 2
1.8V
Junction
Temperature
Range
–40° to +125°C
Package
10-Pin 2mm x 2mm Thin MLF®
Notes:
1. Thin MLF® is GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
Pin Configuration
Lead
Finish
Pb-Free
SNS1 1
EN1 2
AGND 3
SW1 4
PGND 5
10 SNS2
9 EN2
8 AVIN
7 SW2
6 VIN
10-Pin 2mm x 2mm Thin MLF® (MT) Fixed Output
(Top View)
Pin Description
Pin Number
(Fixed)
Pin Name
1 SNS1
2 EN1
3 AGND
4 SW1
5 PGND
6 VIN
7 SW2
8 AVIN
9 EN2
10 SNS2
Pin Function
Sense 1 (Input): Connect to VOUT1 as close to output capacitor as possible to sense output 1
voltage.
Enable 1 (Input): Logic low will shut down output 1. Logic high powers up output 1. Do not leave
unconnected.
Analog Ground. Must be connected externally to PGND.
Switch Node 1 (Output): Internal power MOSFET output.
Power Ground.
Supply Voltage (Power Input): Requires close bypass capacitor to PGND.
Switch Node 2 (Output): Internal power MOSFET output.
Supply Voltage (Power Input): Analog control circuitry. Connect to VIN.
Enable 2 (Input): Logic low will shut down output 2. Logic high powers up output 2. Do not leave
unconnected.
Sense 2 (Input): Connect to VOUT2 as close to output capacitor as possible to sense output 2
voltage.
May 2010
2 M9999-052510



Micrel Semiconductor MIC23254
Micrel, Inc.
MIC23254
Absolute Maximum Ratings(1)
Supply Voltage (VIN) ........................................ 0.3V to +6V
Output Switch Voltage (VSW) ............................. 0.3V to 6V
Sense Input Voltage (VSNS1, VSNS2) ................... 0.3V to VIN
Logic Input Voltage (VEN1, VEN2) ........................ 0.3V to VIN
SEStoDraRgeatTinegm(3p)..e..r.a..t.u..r.e...R...a..n..g..e...(.T..s.)..............................–..6. 5E°SCDtoS+en1s5i0ti°vCe
Operating Ratings(2)
Supply Voltage (VIN)......................................... 2.5V to 5.5V
Sense Input Voltage (VSNS1, VSNS2) ........................ 0V to VIN
Logic Input Voltage (VEN1, VEN2) ............................. 0V to VIN
Junction Temperature (TJ) ..................–40°C TJ +125°C
Thermal Resistance
2mm x 2mm Thin MLF-10 (θJA) .........................70°C/W
Electrical Characteristics(4)
TA = 25°C with VIN = VEN1 = VEN2 = 3.6V; L = 1µH; COUT = 4.7µF; IOUT = 20mA; only one channel power is enabled, unless
otherwise specified. Bold values indicate –40°C< TJ < +125°C.
Parameter
Condition
Min. Typ. Max. Units
Under-Voltage Lockout Threshold
(Turn-On)
2.3 2.4 2.485 V
UVLO Hysteresis
60 mV
Quiescent Current
Shutdown Current
VOUT1, 2 (Both Enabled), IOUT1, 2 = 0mA , VSNS1,2 >1.2 ×
VOUT1, 2 Nominal
VEN1, 2 = 0V; VIN = 5.5V
33 50
0.01 4
µA
µA
Output Voltage Accuracy
VIN = 3.6V, ILOAD = 20mA
–2.5 +2.5 %
Current Limit in PWM Mode
SNS = 0.9 × VOUT NOM
0.410 0.62
1
A
Output Voltage Line Regulation
VIN = 3.6V to 5.5V, ILOAD = 20mA
0.4 %/V
Output Voltage Load Regulation
20mA < ILOAD < 400mA, VIN = 3.6V
0.5 %
PWM Switch ON-Resistance
Frequency
Soft-Start Time
Enable Threshold
ISW = 100mA PMOS
ISW = 100mA NMOS
ILOAD = 120mA
VOUT = 90%
0.6
0.8
4 MHz
260 µs
0.5 0.9 1.2
V
Enable Input Current
0.1 2
µA
Over-Temperature Shutdown
160 °C
Over-Temperature Shutdown Hysteresis
20 °C
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model: 1.5kin series with 100pF.
4. Specification for packaged product only.
May 2010
3 M9999-052510





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