MIC23158/9
3 MHz PWM Dual 2A Buck Regulator
with HyperLight Load and Power Good
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
2.7V to 5.5V Input Voltage
Adjustable Output Voltage (Down to 1.0V)
Two Independent 2A Outputs
Up to 94% Peak Efficiency
83% Typical Efficiency at 1 mA
Two Independent Power Good Indicators
Independent Programmable Soft-Start
45 µA Typical Quiescent Current
3 MHz PWM Operation in Continuous Conduction
Mode
Ultra-Fast Transient Response
Fully Integrated MOSFET Switches
Output Pre-Bias Safe
0.1 µA Shutdown Current
Thermal-Shutdown and Current-Limit Protection
20-Pin 3 mm x 4 mm QFN Package
Internal 225Ω Pull-Down Circuit on Output
(MIC23159)
–40°C to +125°C Junction Temperature Range
General Description
The MIC23158/9 is a high efficiency, 3 MHz, dual, 2A
synchronous buck regulator with HyperLight Load
®
mode, power good output indicator, and programmable
soft start.
The MIC23159 also provides an auto-discharge
feature that switches in a 225Ω pull-down circuit on its
output to discharge the output capacitor when disabled.
HyperLight Load provides very high efficiency at light
loads and ultra-fast transient response which makes
the MIC23158/9 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. The 20-pin 3 mm x 4 mm QFN
package saves precious board space and requires
seven external components for each channel.
The MIC23158/9 is designed for use with a very small
inductor, down to 0.47 µH, and an output capacitor as
small as 2.2 µF that enables a total solution size, less
than 1 mm in height.
The MIC23158/9 has a very low quiescent current of
45 µA and achieves a peak efficiency of 94% in
continuous conduction mode. In discontinuous
conduction mode, the MIC23158/9 can achieve 83%
efficiency at 1 mA.
The MIC23158/9 is available in a 20-pin 3 mm x 4 mm
QFN package with an operating junction temperature
range from –40°C to +125°C.
Applications
•
•
•
•
•
•
Solid State Drives (SSD)
Smartphones
Tablet PCs
Mobile Handsets
Portable Devices (PMP, PND, UMPC, GPS)
WiFi/WiMax/WiBro Applications
Package Type
MIC23158/9
20-Lead QFN (ML)
(Top View)
AGND1
AVIN1
SNS1
17
16
15
14
13
20
19
18
VIN1
PGND1
SW1
SW2
PGND2
VIN2
EN1
1
2
3
4
5
6
7
8
FB1
PG1
SS1
SS2
PG2
FB2
EP
9
10
12
11
AGND2
EN2
2018 Microchip Technology Inc.
AVIN2
SNS2
DS20006020A-page 1
MIC23158/9
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Supply Voltage (AV
IN1
, AV
IN2
, V
IN1
, V
IN2
) .................................................................................................... –0.3V to +6V
Switch1 (V
SW1
), Sense1 (V
SNS1
) .................................................................................................................–0.3V to V
IN1
Enable 1 (V
EN1
), Power Good (V
PG1
) ..........................................................................................................–0.3V to V
IN1
Feedback1 (V
FB1
) ........................................................................................................................................–0.3V to V
IN1
Switch2 (V
SW2
), Sense2 (V
SNS2
) .................................................................................................................–0.3V to V
IN2
Enable2 (V
EN2
), Power Good2 (V
PG2
) .........................................................................................................–0.3V to V
IN2
Feedback2 (V
FB2
) ........................................................................................................................................–0.3V to V
IN2
Power Dissipation (T
A
= 70°C)...............................................................................................................Internally Limited
ESD Rating (Note
1)...................................................................................................................................
ESD Sensitive
Operating Ratings ‡
Supply Voltage (AV
IN1
, V
IN1
) ..................................................................................................................... +2.7V to +5.5V
Supply Voltage (AV
IN2
, V
IN2
) ..................................................................................................................... +2.7V to +5.5V
Enable Input Voltage (V
EN1
, V
EN2
)................................................................................................................. 0V to V
IN1,2
Output Voltage Range (V
SNS1
, V
SNS2
)...................................................................................................... +1.0V to +3.3V
† Notice:
Stresses above those listed under “Absolute 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.
‡ Notice:
The device is not guaranteed to function outside its operating ratings.
Note 1:
Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5 kΩ in series
with 100 pF.
TABLE 1-1:
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
T
A
= +25°C; AV
IN1,2
= V
IN1,2
= V
EN1,2
= 3.6V; L1,2 = 1.0 µH; COUT3,4 = 4.7 µF unless
otherwise specified.
Bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Note 1
Parameter
Supply Voltage Range
Undervoltage Lockout
Threshold
Undervoltage Lockout
Hysteresis
Quiescent Current
Shutdown Current
Feedback Regulation Voltage
Feedback Bias Current
Current Limit
Output Voltage Line
Regulation
I
SHDN
V
FB
I
FB
I
LIM
Symbol
Min.
2.7
2.45
—
—
—
0.6045
—
2.2
—
—
—
Output Voltage Load
Regulation
—
—
—
Typ.
—
2.55
75
45
0.1
0.62
0.01
4.3
0.45
0.45
0.55
1.0
0.8
0.8
Max.
5.5
2.65
—
90
5
0.6355
—
—
—
%/V
—
—
—
—
—
%
Units
V
V
mV
µA
µA
V
µA
A
Conditions
—
Rising
—
I
OUT
= 0 mA, SNS > 1.2 * V
OUTNOM
(both outputs)
V
EN
= 0V; V
IN
= 5.5V (per output)
I
OUT
= 20 mA
Per output
SNS = 0.9 * V
OUTNOM
V
IN
= 3.6V to 5.5V if V
OUTNOM
<
2.5V, I
OUT
= 20 mA
V
IN
= 4.5V to 5.5V if V
OUTNOM
≥
2.5V, I
OUT
= 20 mA
DCM, V
IN
= 3.6V if V
OUTNOM
< 2.5V
DCM, V
IN
= 5.0V if V
OUTNOM
≥
2.5V
CCM, V
IN
= 3.6V if V
OUTNOM
< 2.5V
CCM, V
IN
= 5.0V if V
OUTNOM
≥
2.5V
DS20006020A-page 4
2018 Microchip Technology Inc.
Power technology
京公网安备 11010802033920号
EEWORLD
