MIC2549A-1YM Micrel Inc, MIC2549A-1YM Datasheet

IC SW CURR LIMIT HI SIDE 8-SOP

MIC2549A-1YM

Manufacturer Part Number
MIC2549A-1YM
Description
IC SW CURR LIMIT HI SIDE 8-SOP
Manufacturer
Micrel Inc
Type
High Sider
Datasheet

Specifications of MIC2549A-1YM

Input Type
Non-Inverting
Number Of Outputs
1
On-state Resistance
35 mOhm
Current - Peak Output
3A
Voltage - Supply
2.7 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Short Circuit Current Limit
0.5 to 3A
Input Voltage Range
2.7 to 5.5V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Output / Channel
-
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Other names
576-2180
MIC2549A-1YM

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General Description
The MIC2545A and MIC2549A are integrated high-side
power switches optimized for low loss DC power switching
and other power management applications, including Ad-
vanced Configuration and Power Interface (ACPI). The
MIC2545A/49A is a cost-effective, highly integrated solution
that requires few external components to satisfy USB and
ACPI requirements.
Load current management features include a precision,
resistor-programmable output current-limit and a soft-start
circuit, which minimizes inrush current when the switch is
enabled. Thermal shutdown, along with adjustable current-
limit, protects the switch and the attached device.
The MIC2545A/49A’s open-drain flag output is used to indi-
cate current-limiting or thermal shutdown to a local controller.
The MIC2549A has an additional internal latch which turns
the output off upon thermal shutdown, providing robust fault
control. The enable signal is compatible with both 3V and 5V
logic, and is also used as the thermal shutdown latch reset for
the MIC2549A.
The MIC2545A and MIC2549A are available in active-high
and active-low enable versions in 8-pin DIP, SOIC, and
TSSOP packages.
Typical Application
UL Recognized Component
April 2004
MIC2545A/2549A
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com
Typical Advanced Configuration and Power Interface (ACPI) Application
On/Off
+5V
10k
R
SET
EN
FLG
GND
ILIM
MIC2545A
OUT
OUT
0.1µF
IN
IN
1
Features
• 2.7V to 5.5V input
• Adjustable current-limit up to 3A
• Reverse current flow blocking
• 90 A typical on-state supply current
• 1 A typical off-state supply current
• 50m maximum on-resistance
• Open-drain fault flag
• Thermal shutdown
• Thermal shutdown output latch (MIC2549A)
• 2ms (slow) soft-start turn-on, fast turnoff
• Available with active-high or active-low enable
Applications
• USB power distribution
• PCI Bus Power Switching
• Notebook PC
• ACPI power distribution
• PC card hot swap applications
• Inrush current-limiting
Programmable Current Limit High-Side Switch
33µF
MIC2545A/2549A
Peripheral
M9999-041204
Micrel

Related parts for MIC2549A-1YM

MIC2549A-1YM Summary of contents

Page 1

... The MIC2545A/49A’s open-drain flag output is used to indi- cate current-limiting or thermal shutdown to a local controller. The MIC2549A has an additional internal latch which turns the output off upon thermal shutdown, providing robust fault control. The enable signal is compatible with both 3V and 5V logic, and is also used as the thermal shutdown latch reset for the MIC2549A ...

Page 2

... Active Low MIC2549A-1BM Active High MIC2549A-1BN Active High MIC2549A-1BTS Active High MIC2549A-2BM Active Low MIC2549A-2BN Active Low MIC2549A-2BTS Active Low MIC2549A-1YM Active High MIC2549A-1YN Active High MIC2549A-1YTS Active High MIC2549A-2YM Active Low MIC2549A-2YN Active Low MIC2549A-2YTS Active Low Pin Configuration MIC2545A/2549A ...

Page 3

... Do not float. MIC2549A only: Also resets thermal shutdown latch. FLG Fault Flag (Output): Active-low, open-drain output. Indicates overcurrent or thermal shutdown. MIC2549A only: Latched low on thermal shutdown. GND Ground: Supply return. ILIM Current Limit: Sets current limit threshold using an external resistor (R connected to ground. 76.8 < Supply Input: Output MOSFET drain ...

Page 4

... Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. 4. Assumes 4 layer PCB is used Current limit is determined by: LIMIT 6. Off is 0.8V and on is 2.4V for the MIC2545A-1 and MIC2549A-1. Off is enable input has about 100mV of hysteresis. 7. Guaranteed by design but not production tested. M9999-041204 Operating Ratings (1) Supply Voltage (V ...

Page 5

MIC2545A/2549A Test Circuit V OUT Timing Diagrams OUT OUT April 2004 I Device OUT Under OUT Test 90% 90% 10% Functional Characteristics Test Circuit ...

Page 6

... MIC2545A/2549A EN V OUT I LIMIT OUT FLG Figure 2a. MIC2549A-2 Timing: Output Is Reset By Toggling OUT I LIMIT OUT FLG M9999-041204 Short-Circuit Fault Thermal Shutdown Reached Short-Circuit Fault Fault Removed Thermal Shutdown Reached Figure 2b. MIC2545A-2 Timing 6 Output Reset Fault Removed April 2004 Micrel ...

Page 7

MIC2545A/2549A Typical Characteristics Output On-Resistance vs. Supply Voltage 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) On-State Supply Current vs. Temperature 140 ...

Page 8

MIC2545A/2549A Typical Characteristics cont’d 1500 1400 1300 1200 1100 1000 900 800 700 600 500 -40 -20 M9999-041204 Current Limit vs. Temperature 1200 1100 R = 230 SET I TH 1000 I 900 SET 800 I ...

Page 9

MIC2545A/2549A Functional Characteristics Turn-On Response 500mA MIC2545A-1 TIME (500 s/div.) Current-Limit Response Load Removed Thermal Shutdown Current-Limit Threshold 1.12A ( SET MIC2545A-1 TIME (100ms/div.) Enable Into Short Circuit Short-Circuit Current 820mA Thermal V Shutdown IN R SET ...

Page 10

MIC2545A/2549A Functional Characteristics cont’d M9999-041204 Thermal Shutdown (Output Reset by Toggling Enable—MIC2549-1) Ramped Load to a Short Output Reset Output Latched Thermal Shutdown TIME (100ms/div.) 10 Micrel April 2004 ...

Page 11

... MIC2545A/2549A Block Diagram EN OSC. CHARGE PUMP RESET April 2004 THERMAL SHUTDOWN REFERENCE GATE CONTROL THERMAL SHUTDOWN LATCH (MIC2549A) GND 11 IN 1.2V IN ILIM CURRENT LIMIT R SET OUT OUT FLG M9999-041204 Micrel ...

Page 12

... C. Overtemperature detection functions only when the switch is enabled. The MIC2549A features an internal latch which causes the part to remain off after thermal shutdown until a reset pulse is provided via the enable pin (pin 1). While in current-limit, the thermal shutdown latch prevents on/off cycling of the output ...

Page 13

... MIC2545A/2549A Applications Information Supply Filtering A 0 bypass capacitor from IN to GND, located near the MIC2545A and MIC2549A, is strongly recommended to control supply transients. Without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. ...

Page 14

MIC2545A/2549A "Hot" Receptacle GND M9999-041204 MIC2545A OUT 2 7 FLG IN 0.1 µ GND OUT LIM C 0.1µF Adaptor Card Figure 5. Hot-Plug Application 14 Backend Function BULK ...

Page 15

MIC2545A/2549A Package Information 0.018 (0.57) 0.026 (0.65) 0.157 (3.99) 0.150 (3.81) 0.064 (1.63) 0.045 (1.14) April 2004 PIN 1 DIMENSIONS: INCH (MM) 0.380 (9.65) 0.370 (9.40) 0.135 (3.43) 0.125 (3.18) 0.380 (9.65) 0.130 (3.30) 0.320 (8.13) 0.100 (2.54) 0.0375 (0.952) ...

Page 16

... TEL This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. M9999-041204 4.50 (0.177) DIMENSIONS: 6 ...

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