Diodes PAM2401 User Manual

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Description

The PAM2401 is a high efficiency, current mode, fixed frequency,

step-up DC/DC converter with true output disconnect and inrush

current limiting. The device includes one 0.10Ω N-channel MOSFET

switch and one 0.15Ω P-channel synchronous rectifier. This product

has the ability to simply program the output voltage from 2.5V to

5.0V.The switching frequency is 1.0MHz, programmable current limit

set by an external resistor from 1.0A to 3.0A with internal soft-start.

When loading became light, the converter will automatically enter into

PSM to improve the efficiency.

Quiescent current is only 150µA during Pulse Skip Mode operation,

maximizing battery life in portable applications. Other features include

: <1µA shutdown, anti-ringing control, Hiccup mode at short

protection, over voltage protection and over temperature protection.

The PAM2401 is available in MSOP-8 and U-DFN3030-12 packages

NEW PRODUCT

Diodes Incorporated

1.0MHz STEP-UP DC-DC CONVERTER

Pin Assignments

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PAM2401

Features

• Up to 95% Efficiency

• True Output Disconnect

• Inrush Current Limiting When Power On

• Output Current up to 1000mA at V

• Fixed Frequency Operation Up to 1MHz

• 0.9V to 4.75V Input Range

• 2.5V to 5.0V Adjustable Output Voltage

• Guaranteed 1.0V Start-Up

• Programmable Current Limit

• Internal Soft-Start

• Internal Compensation

• Pulse Sipping Mode at Light Load Operation

• Hiccup Mode Short Protection

• Over Voltage Protection

• Over Temperature Protection

• <1µA Shutdown Current

• Power Good Indicator

• MSOP-8 and U-DFN3030-12 packages

• Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)

• Halogen and Antimony Free. “Green” Device (Note 3)

Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.

3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.

= 3V and V

IN

PAM2401

Document number: DS37285 Rev. 1 - 2

OUT

= 5.0V

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Applications

• Handheld Computers

• Cordless Phones

• GPS Receivers

• Battery Backup Supplies

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Typical Applications Circuit

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PAM2401

NEW PRODUCT

Pin Descriptions

MSOP-8 U-DFN3030-12 Name Function

1 1,2 LX Switch Pin

2 3 EN Enables Control Input.

3 4 VIN Input Voltage Pin

-- 5 PG Power Good Indicator Pin, Open Drain Output

4 6 AGND Analog Ground

5 7 FB Feedback Pin Internally Set to 0.6V.

6 8 RSET Current Limit Setting

7 9,10 OUT Output Pin

8 11,12 PGND Power Ground

Exposed Pad EP Thermal Pad of the Package. Can Be Connected to PGND

Functional Block Diagram

PAM2401

Document number: DS37285 Rev. 1 - 2

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Absolute Maximum Ratings (@T

These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may
affect device reliability. All voltages are with respect to ground.

Parameter Rating Unit

Input Voltage -0.3 to +6.0 V

SW Voltage -0.3 to +6.0 V

SHDN, FB Voltage -0.3 to +6.0 V

V

OUT

Operating Temperature Range -40 to +85 °C

Storage Temperature Range -65 to +125 °C

Lead Temperature (Soldering, 10 sec) 300 °C

Recommended Operating Conditions (@T

Parameter Rating Unit

NEW PRODUCT

Ambient Temperature Range -40 to +85

Junction Temperature Range -40 to +125

= +25°C, unless otherwise specified.)

A

-0.3 to +6.0 V

= +25°C, unless otherwise specified.)

A

°C

Thermal Information

PAM2401

Parameter Package Symbol Max Unit

Thermal Resistance

(Junction to Case)

Thermal Resistance

(Junction to Ambient)

Internal Power Dissipation

PAM2401

Document number: DS37285 Rev. 1 - 2

MSOP-8

U-DFN3030-12 8.5

MSOP-8

U-DFN3030-12 60

MSOP-8

U-DFN3030-12 1.66

Θ

JC

Θ

JC

P

D

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75

180

0.55

°C/W

W

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Electrical Characteristics (T

PARAMETER SYMBOL Test Conditions Min Typ Max Units

Input Voltage Range

Minimum Startup Voltage

Shutdown Supply Current

Quiescent Current Iq

Oscillator Frequency

Maximum Duty Cycle

Output-Voltage Adjust Range

FB Regulation Voltage

Load Regulation LDR

Line Regulation LNR

Drain-Source On-State Resistance

NEW PRODUCT

N-Channel Current Limit (Note)

Pre-charge Current I-Charge

Pre-charge Time T-Charge

SW Leakage Current ILSW 0.1 2 µA

Power Good Threshold VPG 92 %

EN Threshold High

EN Threshold Low

Over Temperature Threshold TOTSD 160 °C

Over Temperature Hysteresis THYS 50 °C

Note: N-Channel current limit is guaranteed by design.

= +25°C, V

A

V

R

= 3.3V, V

IN

V

IN

STARTUP

I

SD

f

OSC

D

MAX

V

O

V

FB

DS(ON)

I

LIMIT

VIN = 0.9V

V

H

OUT

No load, V

IO =1A , VO = 5V

IO = 0.1A, VO = 3.3V

0.1 1 µA

No load, switching (measured with
external feedback); V

0.8 1 1.2 MHz

87.5 %

2.5 5 V

No Load 0.588 0.6 0.612 V

I

= 1mA to 1000mA

OUT

V

= 2.5V to 4.75V, IO = 0.5A

O

P MOSFET 150 250 mΩ

N MOSFET 100 170 mΩ

R

Floating or R

SET

R

SET

R

= 66KΩ

SET

V

+0.5V < VIN

OUT

V

+0.5V < VIN

OUT

VH VIN = 3.3V

V

VIN > 1.2V

L

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= 5V, L = 2.2µH, unless otherwise noted.)

= 5V

O

= 100KΩ

O

SET

= 5V

> 200KΩ

0.9 4.75 V

2.7 4.75

1 V

150 µA

2.5 %

0.3 %/V

3 A

1.5 A

1 A

500 mA

400 µs

0.8

1.5

0.2 V

PAM2401

V

PAM2401

Document number: DS37285 Rev. 1 - 2

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PAM2401

Application Information

Output Voltage Set Equation

The output voltage of the PAM2401, V

connected to the FB pin and the typical value of the voltage at the FB pin is 0.6V. The following equation is used to set the

V

: V

OUT

according to the equation, so a 750kΩ resistor should be chosen for R1.

= 0.6 (1+R1/R2) For example, if output voltage of 5V is needed, with a chosen R2 value of 100kΩ ,the value of R1 can be calculated

OUT

Inductor Selection

To select an inductor for use in PAM2401 applications, it is worth noting that the inductor current saturation rating should be larger than the

possible peak inductor current to ensure proper operation, and should have low DCR (DC resistance). Using an inductor the saturation current of

which is lower than required can cause a dramatic drop in the inductance and can decay the maximum output current levels severely. For most

applications, the value of the inductor should be in the range ofs 1µH to 4.7µH. Its value is chosen based on the desired ripple current.

Larger value inductors result in lower ripple currents, and smaller value inductors result in higher ripple currents. A 1.5µH or 2.2µH inductor will be

the best choice for most PAM2401 applications. The following equation can also help give a good approximate value for the inductor.

V

INxD

NEW PRODUCT

D Duty Cycle=1-V

(Ip).

=

L

Δ

ILxf

, F Switching Frequency = 1.0MHz, ∆IL Ripple Current in the Inductor, i.e., 20% to 40% of the maximum inductor current

IN/VOUT

Output and Input Capacitor Selection
Input Capacitor

At least a 10µF input capacitor is recommended to reduce the input ripple and switching noise for normal operating conditions, while a 10-22µF

capacitor may be required for higher power and dynamic loads. Larger values and lower ESR (Equivalent Series Resistance) may be needed if

the application require very low input ripple. It follows that ceramic capacitors are a good choice for applications. Note that the input capacitor

should be located as close as possible to the IC.

Output Capacitor

A minimum output capacitor value of 22µF is recommended and may be increase to a larger value. The ESR of the output capacitor is important

because it determines the peak to peak output voltage ripple by the following equation:

V

Δ 2

OUT

Multilayer ceramic capacitors are an excellent choice as they have extremely low ESR and are available in small footprints.

>>

Δ

xRESR

IL

PAM2401

Document number: DS37285 Rev. 1 - 2

, is set by an external resistor divider from VOUT to ground as shown in figure 1. The divider tap is

OUT

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Typical Performance Characteristics (T

Output Current (mA)

Output Current (mA)

NEW PRODUCT

100

95

90

85

80

75

70

Efficiency (%)

65

60

55

50

0 100 200 300 400 500 600 700 800 900 1000

Figure 4 Efficiency vs. Output Current (MSOP-8)

5.40

5.35

5.30

5.25

5.20

5.15

5.10

5.05

5.00

4.95

4.90

Output Voltage (V)

4.85

4.80

4.75

4.70

4.65

4.60
0 100 200 300 400 500 600 700 800 900 1000

Figure 6 Output Voltage vs. Output Current

Vin=3.3V
Vin=4.5V

Vin=3.3V
Vin=4.5V

= +25°C, V

A

= 3.3V, V

IN

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Diodes Incorporated

PAM2401

= 5V, unless otherwise noted.)

OUT

100

95

90

85

80

75

70

Efficiency (%)

65

60

55

50

0 100 200 300 400 500 600 700 800 900 1000

Figure 5 Efficiency vs. Output Current (U-DFN)

2200

2000

1800

1600

1400

1200

1000

800

600

Maximun Output Current Ability (mA)

400

200

0

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5

Figure 7 Maximum Output Current vs. Input Voltage

Output Current (mA)

test on steady state

Input Voltage (V)

Vin=3.3V
Vin=4.5V

Vout=3.3V
Vout=3.6V
Vout=4.2V
vout=5V

3.2

3.0

2.8

2.6

2.4

2.2

2.0

1.8

1.6

Inductor Current limit (A)

1.4

1.2

1.0

0.8

0.6
50 60 70 80 90 100 110 120 130 140 150 160 170 180 190

RSET Resistance (Kohm)

Vin=3.3V, Vo=5V

Figure 8 Inductor Current Limit vs. RSET Resistance

160

150

140

130

120

110

Dynamic Supply Current (uA)

100

90

-40-30-20-100 102030405060708090100110120

Figure 9 Dynamic Supply Current vs. Temperature

Vin=4.5V,Vo=5V,Io=0A

Temperature (oC)

PAM2401

Document number: DS37285 Rev. 1 - 2

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Typical Performance Characteristics (cont.) (T

2.6

Vo=3.3V
Vo=3.6V

2.4

Vo=4.2V
Vo=5V

2.2

2.0

1.8

1.6

1.4

1.2

Minimum startup input voltage(V)

1.0

0.8
0 100 200 300 400 500 600 700 800 900 1000 1100

Figure 10 Minimum Startup Input Voltage vs. Output Current

Output Current(mA)

= +25°C, V

A

= 3.3V, V

IN

OUT

Figure 11 Enable Turn On (I

(CH1: Enable; CH2: V

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= 5V, unless otherwise noted.)

= 1A)

O

; CH3:SW; CH4: IO)

OUT

PAM2401

NEW PRODUCT

Figure 12 Enable Turn Off (I

(CH1: Enable; CH2:V

OUT

Figure 14 Output Ripple (I

(CH1: SW; CH2:V

= 1A)

O

; CH3:SW; CH4:Io)

= 0.2A)

O

; CH4:IL)

OUT-AC

Figure 13 Output Ripple (I
(CH1:SW; CH2: V

Figure 15 V

OUT

(CH2:V

OUT-AC

Short Protection (IO = 1A)

; CH3:IL)

OUT

= 0A)

O

; CH4:IL)

Figure 16 V

PAM2401

Document number: DS37285 Rev. 1 - 2

Short Recovery (IO = 1A)

OUT

(CH2: V

; CH3: IL )

OUT

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Ordering Information

Part Number Marking Package Type Standard Package

PAM2401SCADJ

PAM2401YPADJ

NEW PRODUCT

Marking Information

Package Type

S: MSOP-8

Y: U-DFN3030-12

P2401

XXXYW

P2401

XXXYW

PAM2401 X X XXX

Number of Pins

C: 8

P: 12

MSOP-8 2,500 units/ Tape & Reel

U-DFN3030-12 3,000 units/ Tape & Reel

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PAM2401

Output Voltage

ADJ: ADJ

Top View

U-DFN3030-12

PAM2401

Document number: DS37285 Rev. 1 - 2

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PAM2401

Package Outline Dimensions (All dimensions in mm.)

Please see AP02002 at http://www.diodes.com/datasheets/ap02002.pdf for the latest version.

(1) MSOP-8

NEW PRODUCT

(2) U-DFN3030-12

y

A2

A1

D

4

x

1

0

x

1

0

°

Detail C

°

a

L

c

See Detail C

0.25

E

x

1

b

e

Gauge Plane

Seating Plane

4

E3

A3

A

E1

MSOP-8

Dim Min Max Typ

A - 1.10 ­A1 0.05 0.15 0.10
A2 0.75 0.95 0.86
A3 0.29 0.49 0.39

b 0.22 0.38 0.30

c 0.08 0.23 0.15

D 2.90 3.10 3.00

E 4.70 5.10 4.90
E1 2.90 3.10 3.00
E3 2.85 3.05 2.95

e - - 0.65

L 0.40 0.80 0.60

a 0° 8° 4°

x - - 0.750

y - - 0.750
All Dimensions in mm

Pin#1 ID

A

A1

D

D2

E2

E

e

b

A3

SEATING PLANE

L

U-DFN3030-12

Dim Min Max Typ

A 0.57 0.63 0.60

A1 0 0.05 0.02
A3

⎯ ⎯

b 0.18 0.28 0.23

D 2.90 3.10 3.00

D2 2.30 2.50 2.40

e

⎯ ⎯

E 2.90 3.10 3.00

E2 1.50 1.70 1.60

L 0.25 0.55 0.40

All Dimensions in mm

0.15

0.45

Suggested Pad Layout

Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.

(1) MSOP-8

PAM2401

Document number: DS37285 Rev. 1 - 2

Y1

X C

Y

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Dimensions Value (in mm)

C 0.650
X 0.450
Y 1.350

Y1 5.300

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PAM2401

Suggested Pad Layout (cont.)

Please see AP02001 at http://www.diodes.com/datasheets/ap02001.pdf for the latest version.

(2) U-DFN3030-12

DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT,

NEW PRODUCT

INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).

Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.

Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated products for any unintended or unauthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.

Products described herein may be covered by one or more United States, international or foreign patents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.

This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.

Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:

A. Life support devices or systems are devices or systems which:

1. are intended to implant into the body, or

labeling can be reasonably expected to result in significant injury to the user.

B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.

Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their products and any
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.

Copyright © 2014, Diodes Incorporated

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2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the

X

CY

X1

G

G

Z

IMPORTANT NOTICE

LIFE SUPPORT

Dimensions Value (in mm)

Z 2.60
G 0.15
X 1.80

X1 0.60

Y 0.28
C 0.45

PAM2401

Document number: DS37285 Rev. 1 - 2

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