Micrel MIC94162 3a high-side load switch with reverse blocking Datasheet

MIC94161/2/3/4/5
3A High-Side Load Switch
with Reverse Blocking
General Description
Features
The MIC94161/2/3/4/5 is a family of high-side load
switches designed to operate from 1.7V to 5.5V input
voltage. The load switch pass element is an internal
14.5mΩ RDSON N-Channel MOSFET which enables the
device to support up to 3A of continuous current.
Additionally, the load switch supports 1.5V logic level
control and shutdown features in a tiny 1.5mm × 1mm
6-ball WLCSP package.
•
•
•
•
•
•
•
•
•
•
•
•
The MIC9416x provides reverse current protection when
the device is disabled. The device will not allow the flow of
current from the output to the input when the device is
turned OFF. Additionally, the MIC94161 features
overvoltage protection to protect the load when the input
voltage is above 4.55V, as well as a precise enable
threshold which keeps the MIC94161 in the default OFF
state until the EN pin rises above 1.15V.
The MIC94161/2/3/4/5 operating voltage range makes
them ideal for Lithium-ion and NiMH/NiCad/Alkaline
battery-powered systems, as well as non-battery-powered
applications. The devices provide low quiescent current
and low shutdown current to maximize battery life.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
1.5mm × 1mm 6-ball WLCSP package
14.5mΩ RDSON
1.7V to 5.5V input voltage range
3A continuous operating current
Reverse current flow blocking (no “body diode”)
Internal level shift for CMOS/TTL control logic
Ultra-low quiescent current
Micropower shutdown current
Soft-start: MIC94161/4/5 (2.7ms)
Load discharge circuit: MIC94162/4
Ultra-fast turn-off time
Junction operating temperature from −40°C to +125°C
Applications
•
•
•
•
•
•
•
Solid state drives (SSD)
Smart phones and tablets
Personal media players (PMP)
Ultra mobile PCs
Portable instrumentation
GPS modules
Datacom equipment
Typical Application
MIC94161 (2.7ms Soft Start with OVP)
MIC94163 (Ultra-Fast Turn On)
MIC94165 (2.7ms Soft Start)
MIC94162 (Ultra-Fast Turn On with Auto Discharge)
MIC94164 (2.7ms Soft Start with Auto Discharge)
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
March 14, 2014
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Ordering Information
Part Number
Marking
OVP
Turn-On Time
Active Discharge
Package
MIC94161YCS
1Q
Yes
2.7ms
No
1.5mm × 1mm 6-Ball WLCSP
MIC94162YCS
2Q
No
60µs
Yes
1.5mm × 1mm 6-Ball WLCSP
MIC94163YCS
3Q
No
60µs
No
1.5mm × 1mm 6-Ball WLCSP
MIC94164YCS
4Q
No
2.7ms
Yes
1.5mm × 1mm 6-Ball WLCSP
MIC94165YCS
ZQ
No
2.7ms
No
1.5mm × 1mm 6-Ball WLCSP
Pin Configuration
6-Ball 1.5mm × 1mm WLCSP (CS)
(Top View)
Pin Description
Pin Number
Pin Name
A1, B1
VOUT
Source of N-channel MOSFET.
C1
GND
Ground.
A2, B2
VIN
Input Supply: Drain of N-channel MOSFET.
C2
EN
Enable (Input): Active-high control input for switch. Internal 2MΩ pull-down resistor. Output will be
off if this pin is left floating.
March 14, 2014
Pin Function
2
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Absolute Maximum Ratings(1)
Operating Ratings(2)
Input Voltage (VIN) ........................................... −0.3V to +6V
Enable Voltage (VEN) ...................................... −0.3V to +6V
(3)
Continuous Drain Current (ID) ..................................... ±3A
Storage Temperature (Ts) ......................... –55°C to +150°C
(4)
ESD Rating .................................................................. 2kV
Input Voltage (VIN) ...........................................+1.7 to +5.5V
Junction Temperature (TJ) ........................ –40°C to +125°C
Package Thermal Resistance
1.5mm × 1mm 6-Ball WLCSP (θJA) ................. 108°C/W
Electrical Characteristics
TA = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C , unless noted.
Parameter
Symbol
Condition
Min.
Typ.
Max.
Units
1.7
5.5
V
1.15
1.5
V
General
Operating Input Voltage Range
Enable Threshold Voltage
(MIC94161)
Enable Threshold Voltage
(MIC94162/3/4/5)
VIN
VENTH
VENTH
VIN = 1.7V to 5.5V , IOUT = 250μA
Logic Low, OFF; VIN = 1.8V to 5.5V;
IOUT = 250μA; −40˚C ≥ TJ ≤ 85˚C
Logic High, ON; VIN = 1.7V to 5.5V;
IOUT = 250μA; −40˚C ≥ TJ ≤ 125˚C
0.375
V
1.2
Enable Input Current
IEN
VIN = VEN = 3.6V ; IOUT = 0
2
4
µA
Quiescent Current (MIC94161)
IQ
VIN = VEN = 3.6V ; IOUT = 0
40
80
µA
Quiescent Current (MIC94162/3)
IQ
VIN = VEN = 3.6V ; IOUT = 0
25
55
µA
Quiescent Current (MIC94164/5)
IQ
VIN = VEN = 3.6V ; IOUT = 0
15
35
µA
Shutdown Current
ISD
VIN = 5.5V ; VEN = 0V ; IOUT = Open
0.1
1
µA
OFF State Leakage Current
ILEAK
VIN = 5.5V ; VEN = 0V ; IOUT = Short
0.1
1
µA
Reverse Leakage Current
(MIC94161,3,5)
ILEAKR
VIN = 0V ; VOUT = 5.5V ; VEN = 0V
0.1
1
µA
VIN = 5.5V ; VEN = 1.5V ; IOUT = 3A
14.5
VIN = 4.5V ; VEN = 1.5V ; IOUT = 3A
15.5
VIN = 3.6V ; VEN = 1.5V ; IOUT = 3A
17.5
VIN = 2.7V ; VEN = 1.5V ; IOUT = 3A
21
VIN = 1.8V ; VEN = 1.5V ; IOUT = 3A
34
VIN = 1.7V ; VEN = 1.5V ; IOUT = 3A
40
N-Channel ON-Resistance
RDS(ON)
Overvoltage Protection Threshold
(MIC94161)
VOVP
VIN = VEN ; IOUT = 0; VIN rising
Active Discharge Resistance
(MIC94162/4)
RAD
VIN = 3.6V ; ITEST = 1mA ; VEN = 0V
4.5
mΩ
4.75
5
V
200
400
Ω
Notes:
1. Exceeding the absolute maximum ratings may damage the device.
2. The device is not guaranteed to function outside its operating ratings.
3. With thermal contact to PCB (see Application Information).
4. Devices are ESD sensitive. Handling precautions are recommended. Human body model, 1.5kΩ in series with 100pF.
March 14, 2014
3
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Electrical Characteristics (Continued)
TA = 25°C, bold values indicate –40°C ≤ TJ ≤ +125°C , unless noted.
Parameter
Symbol
Condition
Min.
Typ.
Max.
Units
Timing Characteristics
Turn-On Delay Time (MIC94162/3)
tON
VIN = 3.6V ; RLOAD = 1.2Ω ;
COUT = 200μF ; VEN = 1.5V
10
µs
Turn-On Rise Time (MIC94162/3)
tr
VIN = 3.6V ; RLOAD = 1.2Ω ;
COUT = 200μF ; VEN = 1.5V
60
µs
Turn-On Delay Time
(MIC94161/4/5)
tON
VIN = 3.6V ; RLOAD = 1.2Ω ;
COUT = 200μF ; VEN = 1.5V
0.4
ms
Turn-On Rise Time
(MIC94161/4/5)
tr
VIN = 3.6V ; RLOAD = 1.2Ω ;
COUT = 200μF ; VEN = 1.5V
2.7
ms
Turn-Off Delay Time
tOFF
VIN = 3.6V ; RLOAD = 1.2Ω ;
COUT = 200μF ; VEN = 1.5V
25
µs
tf
VIN = 3.6V ; RLOAD = 1.2Ω ;
COUT = 200μF ; VEN = 1.5V
500
µs
Turn-Off Fall Time
March 14, 2014
4
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Timing Diagrams
Figure 1. Output Voltage Rise and Fall time Measurements
Figure 2. Output Voltage Turn On and Turn Off Measurements
March 14, 2014
5
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Typical Characteristics
On Resistance
vs. Temperature
35
80
VOLTAGE DROP (mV)
VIN = 2.7V
25
VIN = 3.6V
20
VIN = 5.5V
15
10
5
35
70
30
60
50
40
VIN = 1.7V
30
20
0
-20
0
20
40
60
80
100
1
10
1000
10000
1.5
750
550
700
650
600
500
550
500
3.0
3.5
4.0
4.5
5.0
5.5
1.32
1.31
1.3
1.29
-20
0
20
40
60
80
100
120
1.5
2
2.5
3
3.5
4
4.5
TEMPERATURE (°C)
INPUT VOLTAGE (V)
Quiescent Current vs.
Input Voltage (MIC94161)
Quiescent vs.
Input Voltage (MIC94162/3)
Quiescent vs.
Input Voltage (MIC94164/5)
80
45
70
40
30
50
IQ (µA)
IQ (µA)
30
40
30
20
VEN = 1.5V
5
VEN = 1.5V
0
2.5
3
3.5
4
4.5
QUIESCENT CURRENT (µA)
March 14, 2014
5
5.5
20
10
10
0
25
15
20
10
5
35
60
40
5.5
1.33
INPUT VOLTAGE (V)
50
2
5.0
1.27
-40
60
1.5
4.5
1.28
VIN = 3.6V
T = 25°C
400
4.0
1.34
ENABLE THRESHOLD (V)
ENABLE (mV)
600
3.5
1.35
750
650
3.0
Enable Threshold vs.
Input Voltage (MIC94161)
700
2.5
2.5
INPUT VOLTAGE (V)
800
2.0
2.0
Enable Threshold vs.
Temperature (MIC94162/3/4/5)
800
ENABLE THRESHOLD (mV)
100
OUTPUT CURRENT (mA)
Enable Threshold vs.
Input Voltage (MIC94162/3/4/5)
1.5
T = 25°C
5
120
TEMPERATURE (°C)
450
20
10
VIN = 5.5V
0
-40
25
15
VIN = 3.6V
10
IOUT = 3A
RDSON (mΩ)
30
ON RESISTANCE (mΩ)
40
90
VIN = 1.7V
INPUT VOLTAGE (V)
RDSON
vs. Input Voltage
Voltage Drop
vs. Output Current
VEN = 1.5V
0
1.5
2
2.5
3
3.5
4
4.5
INPUT VOLTAGE (V)
6
5
5.5
1.5
2
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Typical Characteristics (Continued)
Quiescent Current vs.
Temperature (MIC94161)
Quiescent Current vs.
Temperature (MIC94162/3)
70
60
50
40
30
20
10
40
QUIESCENT CURRENT (µA)
60
80
QUIESCENT CURRENT (µA)
50
40
30
20
10
VIN = 3.6V
0
-20
0
20
40
60
80
100
25
20
15
10
5
120
0
-40
-20
TEMPERATURE (°C)
0
20
40
60
80
100
120
-40
-20
TEMPERATURE (°C)
20
40
60
80
100
120
Rise Time vs.
Input Voltage (MIC94162/3)
45
4.7
0
TEMPERATURE (°C)
TON Delay vs.
Input Voltage (MIC94162/3)
OVP Threshold vs.
Temperature (MIC94161)
250
40
4.69
200
35
4.68
TON DELAY (µs)
OVP THRESHOLD (V)
30
VIN = 3.6V
0
-40
35
VIN = 3.6V
4.67
4.66
4.65
RISE TIME (µs)
QUIESCENT CURRENT (µA)
90
Quiescent Current vs.
Temperature (MIC94164/5)
30
25
20
IOUT = 100mA
15
COUT = 10µF
10
4.64
0
20
40
60
80
100
IOUT = 100mA
COUT = 10µF
50
0
-20
100
5
IOUT = 100mA
4.63
-40
150
120
TEMPERATURE (°C)
0
1.5
2
2.5
3
3.5
4
4.5
INPUT VOLTAGE (V)
5
5.5
1.5
2
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
TON Delay vs.
Input Voltage (MIC94161/4/5)
2000
1800
TON DELAY (µs)
1600
1400
1200
1000
IOUT = 100mA
800
COUT = 10µF
600
400
200
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
March 14, 2014
7
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Functional Characteristics
March 14, 2014
8
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Application Information
The MIC94161/2/3/4/5 is a family of high-side load
switches designed to operate from 1.7V to 5.5V input
voltage. The load switch pass element is an internal
14.5mΩ RDSON N-Channel MOSFET which enables the
device to support up to 3A of continuous current.
Additionally, the load switch supports 1.5V logic level
control and shutdown features in a tiny 1.5mm × 1mm
6-ball WLCSP package.
MAXIMUM SWITCH CURRENT (A)
3.5
The MIC9416x provides reverse current protection when
the device is disabled. The device will not allow the flow
of current from the output to the input when the device is
turned OFF. Additionally, the MIC94161 features
overvoltage protection to protect the load when the input
voltage is above 4.55V, as well as a precise enable
threshold which keeps the MIC94161 in the default OFF
state until the EN pin rises above 1.15V.
Maximum Current vs.
Ambient Temperature
(1" Square Copper)
3
2.5
2
1.5
1
VIN = 5v
VIN = 4v5
VIN = 3v6
VIN=2v5
0.5
0
-60 -40 -20
0
20
40
60
80 100 120 140
AMBIENT TEMPERATURE (°C)
Figure 3. Safe Operating Area (SOA) Graph
Power Dissipation Considerations
As with all power switches, the current rating of the
switch is limited mostly by the thermal properties of the
package and the PCB it is mounted on. There is a simple
ohms law type relationship between thermal resistance,
power dissipation and temperature, which are analogous
to an electrical circuit:
The MIC94162/3 features rapid turn on for applications
that require quick startup time. The MIC94161/4/5
provides a slew rate controlled soft-start turn-on of 2.7ms.
The soft-start feature is provided to prevent an in-rush
current event from pulling down the input supply voltage.
The MIC94162/4 feature an active load discharge circuit
which switches in a 200Ω load when the switch is
disabled to automatically discharge a capacitive load.
An active pull-down on the enable input keeps the
MIC94161/2/3/4/5 in a default OFF state until the enable
pin is pulled above 1.2V. Internal level shift circuitry
allows low voltage logic signals to switch higher supply
voltages. The enable voltage can be as high as 5.5V and
is not limited by the input voltage.
Power Switch SOA
The safe operating area (SOA) curve represents the
boundary of maximum safe operating current and
maximum safe operating junction temperature.
Figure 4. Simple Electrical Circuit
From this simple circuit we can calculate VX if we know
ISOURCE, VZ and the resistor values, RXY and RYZ using
Equation 1:
Figure 3 illustrates the SOA for various input voltages,
with the package mounted on a typical 1 layer, 1 square
inch copper board.
VX = ISOURCE (RXY + RYZ) + VZ
Eq. 1
Thermal circuits can be considered using these same
rules and can be drawn similarly by replacing current
sources with power dissipation (in watts), resistance with
thermal resistance (in °C/W) and voltage sources with
temperature (in °C).
March 14, 2014
9
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
junction temperature of 125°C, in this case can be 30%
higher (see the “On Resistance vs. Temperature” graph
in the Typical Characteristics section):
RSW(MAX) = 27mΩ
Eq. 3
Therefore:
Figure 5. Simple Thermal Circuit
Now replacing the variables in the equation for VX, one
can find the junction temperature (TJ) from power
dissipation, ambient temperature and the known thermal
resistance of the PCB (RθCA) and the package (RθJC).
TRISE = (3A × 27mΩ) × 108°C/W = 26.2°C
2
TJ = TRISE + TA = 26.2°C + 80°C = 106.2°C
2
PDISS is calculated as ISW × RSW(MAX). RθJC is found in the
operating ratings section of the datasheet and RθCA (the
PCB thermal resistance) values for various PCB copper
areas is discussed in the document Designing with Low
Dropout Voltage Regulators available from the Micrel
website.
This is below the maximum 125°C.
Example:
A switch is intended to drive a 3A load and is placed on a
printed circuit board which has a ground plane area of at
2
least 25mm × 25mm (625mm ). The voltage source is a
Li-ion battery with a lower operating threshold of 3V and
the ambient temperature of the assembly can be up to
80°C.
Summary of variables:
•
ISW = 3A
•
VIN = 3V to 4.2V
•
TA = 80°C
•
RθJA = 108°C/W
•
PDISS = ISW x RSW
2
The worst case switch resistance (RSW) at the lowest VIN
of 3V is not available in the datasheet, so the next lower
value of VIN is used, as shown in Equation 2
RSW @ 2.7V = 21mΩ
Eq. 2
If this were a figure for worst case RSW for 25°C, an
additional consideration is to allow for the maximum
March 14, 2014
10
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
Package Information(5) and Recommended Landing Pattern
1.5mm × 1mm 6-Ball WLCSP
Note:
5. Package information is correct as of the publication date. For updates and most current information, go to www.micrel.com.
March 14, 2014
11
Revision 1.1
Micrel, Inc.
MIC94161/2/3/4/5
MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA
TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com
Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right.
Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical
implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.
© 2013 Micrel, Incorporated.
March 14, 2014
12
Revision 1.1
Similar pages