MIC94305
500 mA Switch with Ripple Blocker™ Technology
Features
• 1.8V to 3.6V Input Voltage Range
• Active Noise Rejection Over a Wide Frequency
Band
- >60 dB from 40 kHz to 5 MHz
• Rated to 500 mA Output Current
• Current-Limit and Thermal-Limit Protected
• 1.6 mm × 1.6 mm 6-Pin Thin DFN
• Logic-Controlled Enable Pin
• –40°C to +125°C Junction Temperature Range
General Description
The MIC94305 is an integrated load switch that
incorporates Microchip’s Ripple Blocker™ active filter
technology. The MIC94305 provides high-frequency
ripple attenuation (switching noise rejection) for
applications where switching noise cannot be tolerated
by sensitive downstream circuits, such as RF
applications. A low voltage logic enable pin
disconnects the pass element and puts the MIC94305
in a low current shutdown state when disabled.
The MIC94305 operates from an input voltage of 1.8V
to 3.6V, allowing true load switching of low voltage
power rails in any electronic device. The output voltage
(V
OUT
) is set at a fixed drop (typically 170 mV) from the
input voltage (V
OUT
= V
IN
– 170 mV). This maintains
high efficiency independent of given load conditions
and currents.
The MIC94305 is packaged in a 6-pin 1.6 mm x 1.6 mm
Thin DFN package and has a junction operating
temperature range of –40°C to +125°C.
Applications
•
•
•
•
•
•
•
Smartphones
Tablet PC/Notebooks and Webcams
Digital Still and Video Cameras
Video Conferencing
Barcode Scanners
Global Positioning Systems
Automotive and Industrial Applications
Package Type
MIC94305
6-Pin TDFN (MT)
(Top View)
VOUT 1
6 VIN
VOUT 2
EP
5 VIN
GND 3
4 EN
2018 Microchip Technology Inc.
DS20006029A-page 1
MIC94305
Typical Application Circuit
MIC94305
1.6 x 1.6 TDFN
MIC94305YMT
VIN
DC/DC
C
IN
4.7μF
EN
EN
VOUT
GND
LOAD
C
OUT
4.7μF
Functional Block Diagram
VIN
CHARGE
PUMP
LPF
DRIVER
EN
BIAS AND
THERMAL
SHUTDOWN
VOUT
GND
DS20006029A-page 2
2018 Microchip Technology Inc.
MIC94305
1.0
ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings †
Input Voltage (V
IN
) .................................................................................................................................... –0.3V to +4.0V
Output Voltage (V
OUT
) .............................................................................................................................. –0.3V to +4.0V
Enable Voltage (V
EN
) ............................................................................................................ –0.3V to V
IN
+0.3V or +4.0V
ESD Rating (Note
1)
................................................................................................................................................ +3 kV
Operating Ratings ††
Input Voltage (V
IN
) .................................................................................................................................... +1.8V to +3.6V
Enable Voltage (V
EN
) ..........................................................................................................................................0V to V
IN
† 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.
ELECTRICAL CHARACTERISTICS
Electrical Characteristics:
V
IN
= V
EN
= 3.6V; I
OUT
= 1 mA; C
OUT
= 4.7 µF; T
A
= +25°C,
bold
values indicate –40°C
≤
T
J
≤
+125°C, unless noted.
Note 1
Parameter
Input Voltage
Voltage Drop
V
IN
Ripple Rejection
Total Output Noise
Current Limit
Turn-On Time
Load Regulation
Ground Current
Shutdown Current
Enable
Input Logic Low
Input Logic High
Input Current
Note 1:
—
—
I
IN
—
1.0
—
—
—
0.01
0.4
—
1
V
V
µA
—
—
—
Sym.
V
IN
V
DROP
PSRR
e
N
I
LIM
t
ON
—
I
GND
I
SHDN
Min.
1.8
—
—
—
—
530
—
—
—
—
Typ.
—
170
45
55
98
725
90
10
150
0.2
Max.
3.6
250
—
—
—
1100
150
—
200
5
Units
V
mV
dB
—
V
IN
– V
OUT
, –40°C
≤
T
J
≤
+85°C
f = 20 kHz, I
OUT
= 500 mA
f = 100 kHz to 5 MHz, I
OUT
= 500 mA
V
OUT
= 0V
EN controlled
100 µA to 100 mA
I
OUT
= 100 µA
V
EN
= 0V
Conditions
µV
RMS
f = 10 Hz to 100 kHz
mA
µs
mV
µA
µA
Specification for packaged product only.
2018 Microchip Technology Inc.
DS20006029A-page 3
MIC94305
TEMPERATURE SPECIFICATIONS
Parameters
Temperature Ranges
Junction Operating Temperature
Lead Temperature
Storage Temperature Range
Package Thermal Resistances
Thermal Resistance, TDFN 6-Ld
Note 1:
JA
—
92
—
°C/W
—
The maximum allowable power dissipation is a function of ambient temperature, the maximum allowable
junction temperature and the thermal resistance from junction to air (i.e., T
A
, T
J
,
JA
). Exceeding the
maximum allowable power dissipation will cause the device operating junction temperature to exceed the
maximum +125°C rating. Sustained junction temperatures above +125°C can impact the device reliability.
T
J
—
T
S
–40
—
–65
—
—
—
+125
+260
+150
°C
°C
°C
—
Soldering, 10 sec.
—
Sym.
Min.
Typ.
Max.
Units
Conditions
DS20006029A-page 4
2018 Microchip Technology Inc.
MIC94305
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
FIGURE 2-1:
PSRR C
OUT
= 4.7 µF.
FIGURE 2-4:
PSRR C
OUT
= 10 µF.
FIGURE 2-2:
PSRR C
OUT
= 4.7 µF.
FIGURE 2-5:
PSRR C
OUT
= 10 µF.
FIGURE 2-3:
PSRR C
OUT
= 4.7 µF.
FIGURE 2-6:
PSRR C
OUT
= 10 µF.
2018 Microchip Technology Inc.
DS20006029A-page 5
