26V, 10A DC-to-DC Power Module

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 2017 Microchip Technology Inc.

DS20005603A-page 1

MIC45208-1/-2

Features

• No Compensation Required
• Up to 10A Output Current 
• >93% Peak Efficiency 
• Output Voltage: 0.8V to 0.85*V

IN

 with 

±1% Accuracy

• Adjustable Switching Frequency from 200 kHz to 

600 kHz 

• Enable Input and Open-Drain Power Good (PG) 

Output

• Hyper Speed Control

®

 (MIC45208-2) Architecture 

enables Fast Transient Response

• HyperLight Load

®

 (MIC45208-1) improves Light 

Load Efficiency

• Supports Safe Start-up into Pre-Biased Output
• –40 C to +125°C Junction Temperature Range
• Thermal Shutdown Protection
• Short-Circuit Protection with Hiccup mode
• Adjustable Current Limit
• Available in 52-Pin 10 mm x 10 mm x 4 mm QFN 

Package

Applications

• High-Power Density Point-of-Load (POL) 

Conversion

• Servers, Routers, Networking and Base Stations
• FPGAs, DSP and Low-Voltage ASIC Power Supplies
• Industrial and Medical Equipment

General Description

The MIC45208-1/-2 is a synchronous, step-down regula-
tor module, featuring a unique adaptive ON-time control
architecture. The module incorporates a DC-to-DC
controller, power MOSFETs, bootstrap diode, bootstrap
capacitor and an inductor in a single package, simplifying
the design and layout process for the end user. 
This highly integrated solution expedites system
design and improves product time-to-market. The
internal MOSFETs and inductor are optimized to
achieve high efficiency at a low-output voltage. The
fully optimized design can deliver up to 10A current
under a wide input voltage range of 4.5V to 26V,
without requiring additional cooling.
The MIC45208-1 uses the HyperLight Load (HLL) while
the MIC45208-2 uses Hyper Speed Control (HSC) archi-
tecture, which enables ultra-fast load transient
response, allowing for a reduction of output capacitance.
The MIC45208 offers 1% output accuracy that can be
adjusted from 0.8V to 0.85*V

IN

 with two external

resistors. Additional features include thermal shutdown
protection, input undervoltage lockout, adjustable
current limit and short-circuit protection. The MIC45208
allows for safe start-up into a pre-biased output.
Data sheet and other support documentation can be
found on the Microchip web site at: 

www.microchip.com

Typical Application Schematic

R

FB1

V

OUT

1.5V/10A

MIC45208

V

IN

12V

C

OUT

C

IN

GND

PV

IN

V

OUT

R

FB2

FB

SW

I

LIM

PGND

BST

ANODE

EN

FREQ

ON

PG

PV

DD

5V

DD

R

LIM

RIB

OFF

V

IN

C

FF

RIA

26V, 10A DC-to-DC Power Module

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MIC45208-1/-2

DS20005603A-page 2

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Package Types

 

 

 

5V

DD

5V

DD

PV

DD

PV

IN

PV

DD

PGND

 

PGND

PGND

KEEPOUT

SW

SW

SW

KEEPOUT

PV

IN

PV

IN

ANODE

ANODE

RIB

V

OUT

RIA

RIA

KEEPOUT

SW

SW

SW

SW

SW

KEEPOUT

V

OUT

V

OUT

GND

I

LIM

FREQ

V

IN

EN

PG

FB

GND

BST

BST

BST

 

PV

IN

PV

IN

PV

IN

PV

IN

KEEPOUT

 

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

V

OUT

 

PGND

SW

PV

IN

 ePAD

V

OUT

 ePAD

1

2

3

13

4

5

6

7

8

9

10

11

12

14

15

52

51

50

49

48

47

46

45

44

43

42

16

17

18

19

20

21

22

23

24

25

26

41

40

39

29

38

37

36

35

34

33

32

31

30

28

27

MIC45208-1/-2

52-Pin 10 mm x 10 mm QFN (MP)

(Top View)

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DS20005603A-page 3

MIC45208-1/-2

Functional Block Diagram

PWM

CONTROLLER

V

OUT

Q1

Q2

PV

IN

BST

EN

I

LIM

PV

DD

PGND

5V

DD

FREQ

PG

SW

GND

L1

C3

SW

DH

DL

V

IN

BST

ANODE

PGND

V

DD

AGND

PV

DD

I

LIM

PG

FB

FREQ

EN

FB

D1

V

IN

RIA

C4

C1

C2

R1

RIB

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MIC45208-1/-2

DS20005603A-page 4

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1.0

ELECTRICAL CHARACTERISTICS

Absolute Maximum Ratings

V

PVIN

, V

VIN 

to PGND.................................................................................................................................  –0.3V to +30V

V

PVDD

, V

5VDD

, V

ANODE 

to PGND ................................................................................................................  –0.3V to +6V

V

SW

, V

FREQ

, V

ILIM

, V

EN

 to PGND ..................................................................................................  –0.3V to (V

IN

 + 0.3V)

V

BST 

to V

SW

.................................................................................................................................................  –0.3V to +6V

V

BST 

to PGND

 

..........................................................................................................................................  –0.3V to +36V

V

PG

 to PGND .............................................................................................................................  –0.3V to (5 V

DD

 + 0.3V)

V

FB

, V

RIB 

to PGND.....................................................................................................................  –0.3V to (5 V

DD

 + 0.3V)

PGND to GND..........................................................................................................................................  –0.3V to +0.3V
Junction Temperature........................................................................................................................................... +150°C
Storage Temperature (T

S

) ..................................................................................................................... –65°C to +150°C

Lead Temperature (soldering, 10s) ...................................................................................................................... +260°C
ESD Rating ...............................................................................................................................................  ESD Sensitive

Operating Ratings

(

1

)

Supply Voltage (V

PVIN, 

V

VIN

) .........................................................................................................................  4.5V to 26V

Output Current ........................................................................................................................................................... 10A
Enable Input (V

EN

) ............................................................................................................................................  0V to V

IN

Power-Good (V

PG

) .........................................................................................................................................  0V to 5V

DD

Junction Temperature (T

J

)..................................................................................................................... –40°C to +125°C

Junction Thermal Resistance

(

2

)

10 mm x 10 mm x 4 mm QFN-52 (

JA

) ...........................................................................................................16.6°C/W

10 mm x 10 mm 4 mm QFN-52 (

JC

) ...................................................................................................................4°C/W

Note 1:

The device is not ensured to function outside the operating range.

2:

JA

 and 

JC

 were measured using the MIC45208 evaluation board.

Notice:

 Stresses above those listed under “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 indi-
cated in the operational sections of this specification is not intended. Exposure to maximum rating conditions for
extended periods may affect device reliability.

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DS20005603A-page 5

MIC45208-1/-2

TABLE 1-1:

ELECTRICAL CHARACTERISTICS

(

1

)

Electrical Specifications:

 unless otherwise specified, PV

IN

= V

IN

 = V

EN

= 12V;  V

OUT

= 3.3V;  V

BST

– V

SW

  = 5V; 

T

J

= +25°C. Boldface values indicate –40°C 

 T

J

 +125°C.

Symbol

Parameter

Min.

Typ.

Max.

Units

Test Conditions

Power Supply Input
V

IN

, PV

IN

Input Voltage Range

4.5

26

V

I

Q

Quiescent Supply Current 
(MIC45208-1)

0.75

mA

V

FB

= 1.5V

I

Q

Quiescent Supply Current 
(MIC45208-2)

2.1

3

mA

V

FB

= 1.5V

I

IN

Operating Current:

MIC45208-1

0.4

mA

V

PVIN

= V

IN

 = 12V, 

V

OUT

= 1.8V, I

OUT

 = 0A,

f

SW

 = 600 kHz

MIC45208-2

43

I

SHDN

Shutdown Supply Current

4

10

µA

SW = Unconnected, V

EN

 = 0V

5V

DD

 Output

V

DD

5V

DD

 Output Voltage

4.8

5.1

5.4

V

V

IN

 = 7V to 26V, I

5VDD

 = 10 mA

UVLO

5V

DD 

UVLO Threshold

3.8

4.2

4.6

V

V

5VDD

 Rising

UVLO_HYS 5V

DD 

UVLO Hysteresis

400

mV

V

5VDD

 Falling

V

DD(LR)

LDO Load Regulation

0.6

2

3.6

%

I

5VDD 

= 0 to 40 mA

Reference

V

FB

Feedback Reference Voltage

0.792

0.8

0.808

V

T

J

= +25°C

0.784

0.8

0.816

–40°C 

 T

J

 +125°C

I

FB_BIAS

Feedback Bias Current

5

500

nA

V

FB

 = 0.8V

Enable Control
EN

HIGH

EN Logic Level High

1.8

V

EN

LOW

EN Logic level Low

0.6

V

EN

HYS

EN Hysteresis

200

mV

I

ENBIAS

EN Bias Current

5

10

µA

V

EN

= 12V

Oscillator

f

SW

Switching Frequency

400

600

750

kHz

V

FREQ

= V

IN,

 I

OUT

 = 2A

350

V

FREQ

= 50%  V

IN,

 I

OUT

 = 2A

D

MAX

Maximum Duty Cycle

85

%

D

MIN

Minimum Duty Cycle

0

%

V

FB

 = 1V

t

OFF(MIN)

Minimum OFF-Time

140

200

260

ns

Soft Start
t

SS

Soft Start Time

3

ms

FB from 0V to 0.8V

Short-Circuit Protection
V

CL_OFFSET

Current-Limit Threshold 

–30

–14

0

mV

V

FB

= 0.79V

V

SC

Short-Circuit Threshold

–23

–7

9

mV

V

FB

= 0V

I

CL

Current-Limit Source Current

50

70

90

µA

V

FB

= 0.79V

I

SC

Short-Circuit Source Current

25

35

45

µA

V

FB

= 0V

Leakage
I

SW_Leakage

SW, BST Leakage Current

10

µA

I

FREQ_LEAK

FREQ Pin Leakage Current

10

µA

Note 1:

Specification for packaged product only.

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MIC45208-1/-2

DS20005603A-page 6

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Power Good (PG)
V

PG_TH

PG Threshold Voltage

85

90

95

%V

OUT

Sweep V

FB

 from Low-to-High

V

PG_HYS

PG Hysteresis

6

%V

OUT

Sweep V

FB

 from High-to-Low

t

PG_DLY

PG Delay Time

100

µs

Sweep V

FB

 from Low-to-High

V

PG_LOW

PG Low Voltage

70

200

mV

V

FB

 < 90% x V

NOM

, I

PG

 = 1 mA

Thermal Protection
T

SHD

Overtemperature Shutdown

160

°C

T

J

 Rising

T

SHD_HYS

Overtemperature Shutdown 
Hysteresis

15

°C

TABLE 1-1:

ELECTRICAL CHARACTERISTICS

(

1

)

 (CONTINUED)

Electrical Specifications:

 unless otherwise specified, PV

IN

= V

IN

 = V

EN

= 12V;  V

OUT

= 3.3V; V

BST

– V

SW

  = 5V; 

T

J

= +25°C. Boldface values indicate –40°C 

 T

J

 +125°C.

Symbol

Parameter

Min.

Typ.

Max.

Units

Test Conditions

Note 1:

Specification for packaged product only.

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DS20005603A-page 7

MIC45208-1/-2

2.0

TYPICAL PERFORMANCE CURVES

Note: 

Unless otherwise indicated, V

IN

= 12V,  f

SW

= 600 kHz, T

J

= +25°C.

FIGURE 2-1:

V

IN

 Operating Supply 

Current vs. Temperature (MIC45208-1).

FIGURE 2-2:

V

IN

 Operating Supply 

Current vs. Temperature (MIC45208-2).

FIGURE 2-3:

V

IN

 Shutdown Current vs. 

Input Voltage.

FIGURE 2-4:

V

DD

 Supply Voltage vs. 

Temperature.

FIGURE 2-5:

Enable Threshold vs. 

Temperature.

FIGURE 2-6:

EN Bias Current vs. 

Temperature.

Note:

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.

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DS20005603A-page 8

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Note: 

Unless otherwise indicated, V

IN

= 12V,  f

SW

= 600 kHz, T

J

= +25°C.

FIGURE 2-7:

Feedback Voltage vs. 

Temperature.

FIGURE 2-8:

Output Voltage 

vs.Temperature.

FIGURE 2-9:

Switching Frequency 

vs.Temperature.

FIGURE 2-10:

Output Peak Current-Limit

 

vs. Temperature.

FIGURE 2-11:

Efficiency (V

IN

 = 5V) vs. 

Output Current (MIC45208-1).

FIGURE 2-12:

Efficiency (V

IN

 = 12V) vs. 

Output Current (MIC45208-1).

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DS20005603A-page 9

MIC45208-1/-2

Note: 

Unless otherwise indicated, V

IN

= 12V,  f

SW

= 600 kHz, T

J

= +25°C.

FIGURE 2-13:

Efficiency (V

IN

 = 24V) vs. 

Output Current (MIC45208-1).

FIGURE 2-14:

Efficiency (V

IN

 = 5V) vs. 

Output Current (MIC45208-2).

FIGURE 2-15:

Efficiency (V

IN

 = 12V) vs. 

Output Current (MIC45208-2).

FIGURE 2-16:

Efficiency (V

IN

 = 24V) vs. 

Output Current (MIC45208-2).

FIGURE 2-17:

Load Regulation vs. Input 

Voltage.

FIGURE 2-18:

Line Regulation.

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MIC45208-1/-2

DS20005603A-page 10

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Note: 

Unless otherwise indicated, V

IN

= 12V,  f

SW

= 600 kHz, T

J

= +25°C.

FIGURE 2-19:

IC Power Dissipation 

(V

IN

 = 5V) vs. Output Current (MIC-45208-1).

FIGURE 2-20:

IC Power Dissipation 

(V

IN

 = 12V) vs. Output Current (MIC45208-1).

FIGURE 2-21:

IC Power Dissipation 

(V

IN

 = 24V) vs. Output Current (MIC45208-1).

Maker
Microchip Technology Inc.
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