OMO ElectronicOMO Electronic
Expand menu
0 Cart

MIC2224YML

P1-P3P4-P6P7-P9P10-P12P13-P13
MIC2224
High Efficiency 2MHz PWM Buck Converter with
DAC Input and 40m Bypass Switch
MLF and MicroLeadFrame are registered trademarks or 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
September 2006 1
M9999-091106
General Description
The MIC2224 is a high efficiency 2MHz PWM synchronous
buck switching regulator optimized for powering 2.5G and
3G CDMA RF Power Amplifiers. The output voltage of
MIC2224 can be dynamically adjusted with an external
DAC to maximize PA efficiency versus required output
power. When the PA requires the highest power, the DAC
can be used to enable a low on-resistance, 40m, bypass
switch that powers the PA directly from the battery.
The 2MHz PWM operation of MIC2224 allows the smallest
possible components. It also allows the device to easily
meet stringent W-CDMA V
OUT
response specifications.
The MIC2224 operates from a 2.7V to 5.5V input, making
it ideal for single cell Li-Ion applications. The device
features built-in power MOSFETs that can supply up to
600mA of output current in PWM mode, or over 1A in
bypass mode. The MIC2224 can operate with a maximum
duty cycle of 100% for use in low-dropout conditions.
The MIC2224 has a junction temperature range of
–40°C to +125°C and is available in a 10-pin 3mm x 3mm
MLF
®
package.
Data sheets and support documentation can be found on
Micrel’s web site at www.micrel.com.
Features
• 2.7V to 5.5V input voltage range
• DAC-adjustable output voltage down to 0.3V
• 600mA output current in PWM mode
• Internally protected 40m bypass switch
• Allows direct connection of battery to load
• Over 95% efficient
• Fully integrated MOSFET switches
• Constant 2MHz PWM operation
• Internal soft-start
• 1% line and load regulation
• <1µA shutdown current
• Under-voltage lockout
• Thermal shutdown and current limit protection
• –40°C to +125°C junction temperature range
Applications
• Cellular phones
• PDAs
Typical Application
MIC2224
VIN
AVIN
ENABLE
DAC
DAC
V
IN
2.6V to 5.5V
GND GND
V
OUT
C1
1µF
C2
1µF
L1
4.7µH
AGND PGND
VOUT
SW
2, 3
5
4
6
710
8, 9
1
2MHz PWM Converter with DAC Input
and 40m Bypass Switch
0
0.6
1.2
1.8
2.4
3.0
3.6
4.2
4.8
5.4
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8
V
OUT
(V)
V
DAC
(V)
V
IN
=4.2V
V
OU
T
=
V
D
A
C
X3
Bypass
Mode
Micrel, Inc. MIC2224
September 2006 2
M9999-091106
Ordering Information
(1)
Part Number
Output
Voltage
Junction
Temp. Range
Package Lead Finish
MIC2224YML Adj. –40°C to +125°C 10-Pin 3mm x 3mm MLF
®
Pb-Free
Pin Configuration
SW
VIN
VIN
EN
PGND
VOUT
VOUT
AGND
1
2
3
4
10
9
8
7
56
AVIN DACEP
10-Pin MLF
®
(ML)
Pin Description
Pin Number Pin Name Pin Function
1 SW Switch (Output): Internal power MOSFET output switches.
2, 3 VIN Supply Voltage (Input): Requires bypass capacitor to GND.
4 EN
A low level EN will power down the device, reducing the quiescent current to under
5µA (typ 1µA).
5 AVIN Supply Voltage (Input): Requires bypass capacitor to GND.
6 DAC
DAC Control Input. Provides control of output voltage. The output voltage is 3 X the
DAC voltage. (Ex. 0.5VDAC = 1.5V
OUT
). Bypass mode is enabled when the DAC
voltage exceeds 1.2V.
7 AGND Signal Ground of chip.
8, 9 VOUT Source of Internal P-Channel MOSFET and Feedback of internal PWM regulator.
10 PGND Power Ground of chip.
EP Exposed Pad Connect to ground.
Micrel, Inc. MIC2224
September 2006 3
M9999-091106
Absolute Maximum Ratings
(1)
Supply Voltage (V
IN
)............................................... 0V to 6V
Output Switch Voltage (V
SW
). ...........................................6V
DAC Input Voltage (V
DAC
)............................ 0V to V
IN
+0.3V
Output Switch Current (I
SW
)...........................................2.5A
Logic Input Voltage (V
EN
) ............................ 0V to V
IN
+0.3V
Storage Temperature (T
s
) .........................–65°C to +150°C
Operating Ratings
(2)
Supply voltage (V
IN
) ....................................... 2.7V to +5.5V
Output Voltage (V
OUT
). ........................................ 0V to 5.5V
DAC Input Voltage (V
DAC
).................................... 0.1V to V
IN
Junction Temperature (T
J
) ........................–40°C to +125°C
Thermal Resistance
MLF
®
-10 (θ
JA
) ....................................................60°C/W
Electrical Characteristics
(4)
V
IN
= V
EN
= 3.6V; V
DAC
= 0.6V; L = 4.7µH; C
OUT
= 1µF; T
A
= 25°C, bold values indicate –40°C< T
J
< +125°C, unless noted.
Parameter Condition Min Typ Max Units
Supply Voltage Range
2.7
5.5
V
Total Quiescent Current VDAC = 0.6V VOUT = 2.4V (regulator on, not switching)
360
450
µA
Shutdown Current VEN = 0V (regulator off)
1
5
µA
Maximum Duty Cycle
100
%
Regulation
Output Voltage VDAC = 0.6V, ILOAD =0mA
1.746
1.8
1.854
V
Output Voltage Line Regulation 3.0V VIN 4.5, ILOAD= 10mA
0.05 0.5 %/V
Output Voltage Load Regulation 0mA < IOUT < 500mA
0.2 %
Output
Switch On-Resistance
ISW = -100mA, High-Side Switch
ISW = 100mA , Low-Side Switch
0.55
0.6
0.75
0.85
Current limit (Peak SW Current)
0.65
0.85
1.6
A
Oscillator
Frequency
1.8
2
2.2
MHz
Enable / UVLO
Enable Pin Threshold
0.5
0.9
1.3
V
Enable Pin Hysteresis
30
mV
Enable Pin Input Current
0.01
1
µA
EN high to 90% VOUT
25
50
µs
Under-Voltage Lockout Threshold (turn-on)
2.6
2.7
V
UVLO Hysteresis
85
mV
DAC Input
DAC Input Current
0.15
2
µA
Output Voltage/DAC Voltage (internally set)
3 V/V
Bypass Switch
Bypass Switch Threshold
1.176
1.2
1.224
V
Bypass Switch Hysteresis 35
mV
Bypass Transition Time 10
µs
Bypass Switch On-Resistance 40
m
Bypass Switch Leakage
5
µA
Bypass Over-Current Limit
1
1.4
2.5
A
Current Limit Retry Time 32 µs
Current Limit Retry Duty Cycle 12.5 %
P1-P3P4-P6P7-P9P10-P12P13-P13

MIC2224YML

Mfr. #:
Buy MIC2224YML
Manufacturer:
Description:
IC REG CONV RF PWR 1OUT 10MLF
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet