MICREL MIC2505-2BN, MIC2505BM, MIC2505BN, MIC2506BM, MIC2505-2BM Datasheet

MIC2505/2506 Micrel

MIC2505/2506

Single 2A / Dual 1A / High-Side Switches

General Description

The MIC2505, MIC2505-1, MIC2505-2, and MIC2506 are
single and dual integrated high-side power switches that
consist of TTL compatible control/enable inputs, a charge
pump, and protected N-channel MOSFETs. The MIC2505/6
family can be used instead of separate high-side drivers and
MOSFETs in many low-voltage applications.

The MIC2505/6 family controls voltages ranging from 2.7V to

7.5V. The MIC2505-series can deliver at least 2A continuous
current while the MIC2506 can deliver at least 1A continuous
current from each output. A slow turn-on feature prevents
high inrush current when switching capacitive loads. The
internal control circuitry is powered from the same 2.7V to

7.5V. Within the device’s input range, outputs can be forced
higher than the input voltage when disabled.

Multipurpose open-drain fault flag outputs indicate overcur­rent limiting, open-load detection (except MIC2505-1 and -2
versions), thermal shutdown, or undervoltage lockout for
each channel.

Overcurrent limiting is internally fixed and requires no exter­nal components.

Open-load detection is active when the switch is off. When
off, a normal load pulls the output pin low. If the load is open,
an optional, external, high-value resistor pulls the output pin
high, triggering the fault flag. MIC2505-1 and -2 versions are
tailored to Universal Serial Bus (USB) applications and do not
include open-load detection.

Thermal shutdown turns off the output if the die temperature
exceeds approximately 135°C. If enabled, the switch auto­matically restarts when the temperature falls 10°C.

Undervoltage lockout (UVLO) shuts off the output if the
supply drops below 2.3V typical and reenables the output
when the supply exceeds 2.5V typical.

Features

• Low MOSFET on resistance to 2.7V
30mΩ typical at 5V (MIC2505-series)
35mΩ typical at 3.3V (MIC2505-series)
75mΩ typical at 5V (each MIC2506 output)
80mΩ typical at 3.3V (each MIC2506 output)

• 2.7V to 7.5V input

• 110µA typical on-state supply current

•1µA typical off-state supply current

• Output can be forced higher than input (off-state)

• Current limit

• Thermal shutdown

• 2.5V undervoltage lockout (UVLO)

• Open-load detection
(MIC2505BN/M and MIC2506BN/M only)

• Open-drain fault flag

• 5ms (slow) turn-on and fast turnoff

• Logic-level control/enable input

Applications

• USB Power Distribution

• 3.3V and 5V power management

• PC Card card inrush limiting switch

• Hot plug-in power supplies

• Battery-charger circuits

Typical Applications

2.7V to 7.5V

Resistors

(100k each)

A ON

A OFF

FAULT B

B ON

B OFF

Pull-up

MIC2506BM

18

CTL A OUT A

27

FLG A

36

FLG B GND

45

CTL B OUT B

ON

OFF

Pull-up

Resistor

(100k)

MIC2505BM

18

CTL OUT

27

FLG

36

GND OUT

45

GATE IN

Optional
Output Delay
Capacitor

INFAULT

0.1µF

100k

Optional

Open Load
Detect Resistor
(MIC2505BN or

MIC2505BM

only)

Load

Single and Dual Switch/Circuit Breakers with Open-Load Detection and Fault Output

April 1998 1 MIC2505/2506

2.7V to 7.5V

INFAULT A

0.1µF

100k 100k

Optional
Open Load
Detect Resistors

Load B

Load A

MIC2505/2506 Micrel

Ordering Information

Part Number Control/Enable Open-Load Detect Temperature Range Package
Single-Switch

MIC2505BM Active-High Yes –40°C to +85°C 8-pin SOIC
MIC2505BN Active-High Yes –40°C to +85°C 8-pin DIP
MIC2505-1BM Active-High No –40°C to +85°C 8-pin SOIC
MIC2505-1BN Active-High No –40°C to +85°C 8-pin DIP
MIC2505-2BM Active-Low No –40°C to +85°C 8-pin SOIC
MIC2505-2BN Active-Low No –40°C to +85°C 8-pin DIP

Dual Switch

MIC2506BM Active-High Yes –40°C to +85°C 8-pin SOIC
MIC2506BN Active-High Yes –40°C to +85°C 8-pin DIP

Pin Configuration

MIC2505/-1/-2

CTL

1

FLG

2
3

GND

GATE

(CTL A) 1
(FLG A) 2

(GATE A) 4

4

8-Pin SOIC (M)

8-Pin DIP (N)

MIC2505/-1/-2

LOGIC,

CHARGE

PUMP

3 (GND)

OUT

8

IN

7

OUT

6

IN

5

6, 8 (OUT)

5, 7 (IN)

CTL A
FLG A
FLG B
CTL B

(CTL A) 1

(FLG A) 2
(FLG B) 3

(CTL B) 4

MIC2506

1
2
3
4

MIC2506

LOGIC,

CHARGE

PUMP

LOGIC,

CHARGE

PUMP

6 (GND)

8-Pin SOIC (M)

8-Pin DIP (N)

OUT A

8

IN

7

GND

6

OUT B

5

8 (OUT A)

7 (IN)

5 (OUT B)

MIC2505/2506 2 April 1998

MIC2505/2506 Micrel

Pin Description

Pin Number Pin Number Pin Name Pin Function

MIC2505 series

1 1 / 4 CTL (A/B) Control (Input): TTL compatible control input. High input typically > 1.8V.

2 2 / 3 FLG (A/B) Fault Flag (Output): Active-low, open-drain output. If CTL is low, indicates

3 6 GND Ground: Return.
4 — GATE Output MOSFET Gate: Open for fastest rise time. Connect capacitor to

5, 7 7 IN Supply Input: Output MOSFET drain. Also supplies IC’s internal circuitry.

6, 8 8 / 5 OUT (A/B) Switch Output: Output MOSFET source. Typically connect to switched side

MIC2506

Low input typically < 1.6V. MIC2505, MIC2505-1 and MIC2506 are active
high. MIC2505-2 is active low.

open load. If CTL is high, indicates current limit, thermal shutdown, or
UVLO.

MIC2505-1 and -2 do not support open-load detect

ground to slow rise time. (See MIC2505 Turn-On Delay graph)

Connect to supply.

MIC2505 series only:

of load. Output voltage can be pulled above input voltage in off mode.

MIC2505 series only:

Pins 5 and 7 must be externally connected together.

Pins 6 and 8 must be externally connected together.

.

Absolute Maximum Ratings

Supply Voltage (VIN) ....................................................8.0V

Fault Flag Voltage (V
Fault Flag Current (I
Output Voltage (V
Output Current (I
Gate Voltage (V
Control Input (V

OUT

OUT

GATE

CTL

).............................................7.5V

FLG

) ............................................50mA

FLG

) .................................................7.5V

)............................... Internally Limited

) ......................................... VIN + 15V

) ....................................... –0.3V to 15V

Operating Ratings

Supply Voltage (VIN) ................................... +2.7V to +7.5V

Ambient Operating Temperature (TA) ........–40°C to +85°C

Thermal Resistance

SOIC (θJA).........................................................160°C/W

DIP (θJA)............................................................105°C/W

Storage Temperature (TA) .......................–65°C to +150°C

Lead Temperature (Soldering 5 sec.) ....................... 260°C

April 1998 3 MIC2505/2506

MIC2505/2506 Micrel

Electrical Characteristics

VIN = +5V; GATE = open; TA = 25°C, bold indicates –40°C ≤ TA ≤ +85°C; unless noted
Parameter Condition Min Typ Max Units

Supply Current MIC2505-1 V

MIC2506 V
MIC2505-2 V

Control Input Voltage V

Control Input Current V

Control Input Capacitance 1pF
Output MOSFET Resistance MIC2505 series V

MIC2506 V

Output Turn-On Delay MIC2505 series RL = 10Ω, C

MIC2506 RL = 10Ω each output 100 700 2000 µs

Output Turn-On Rise Time MIC2505 series RL = 10Ω, C

MIC2506 RL = 10Ω each output 200 2000 6000 µs

Output Turnoff Delay MIC2505 series RL = 10Ω, C

MIC2506 RL = 10Ω each output 0.8 20 µs

Output Turnoff Fall Time MIC2505 series RL = 10Ω, C

MIC2506 RL = 10Ω each output 0.7 20 µs
Output Leakage Current 10 µA
Current Limit Threshold MIC2505 series 2 4A

MIC2506 1 23A
Open Load Threshold, Note 1 V
Overtemperature Shutdown T

Threshold TJ decreasing 125 °C
Error Flag Output Resistance V

Error Flag Off Current V
UVLO Threshold V

= logic 0, OUT = open 0.75 5 µA

CTL

= logic 1, OUT = open 110 160 µA

CTL

= logic 0, OUT = open 110 160 µA

CTL

V

= logic 1, OUT = open 0.75 5 µA

CTL

= logic 0 → logic 1 transition 2.1 2.4 V

CTL

V

= logic 1 → logic 0 transition 0.8 1.9 V

CTL

= logic 0 0.01 1 µA

CTL

V

= logic 1 0.01 1 µA

CTL

= 5V, TA = 25°C3050 mΩ

IN

= 5V, –40°C < TA < +85°C 60 mΩ

V

IN

V

= 3.3V, TA = 25°C3560 mΩ

IN

VIN = 3.3V, –40°C < TA < +85°C 75 mΩ

= 5V, TA = 25°C75125 mΩ

IN

V

= 5V, –40°C < TA < +85°C 150 mΩ

IN

= 3.3V, TA = 25°C80135 mΩ

V

IN

VIN = 3.3V, –40°C < TA < +85°C 165 mΩ

= 0 200 850 2000 µs

GATE

= 0 500 3000 7500 µs

GATE

= 0 0.7 20 µs

GATE

= 0 1.5 20 µs

GATE

= logic low, Note 2 0.5 1 1.5 V

CTL

increasing 135 °C

J

= 5V, IL = 10mA 10 25 Ω

IN

VIN = 3.3V, IL = 10mA 15 40 Ω

= 5V 0.01 1 µA

FLAG

= increasing 2.2 2.5 2.7 V

IN

VIN = decreasing 2.0 2.3 2.5 V

General Note: Devices are ESD protected, however, handling precautions recommended.
General Note: All limits guaranteed by testing or statistical analysis.
Note 1: MIC2505-1 and -2 versions have no open load detect feature.
Note 2: Open-load threshold is the output voltage (V

resistor to VIN.

) where FLG becomes active (low) when CTL is low. OUT is pulled high by a 100k external

OUT

MIC2505/2506 4 April 1998