Datasheet UG-431 Datasheet (ANALOG DEVICES)

ADP1853-EVALZ User Guide

UG-431

ADP1853 VIN+ TERMINAL GND TERMI NAL

VOUT+ TE RM INAL

10831-001

One Technology Way P. O. Box 9106 Norwood, MA 02062-9106, U.S.A. Tel: [phone] Fax: [phone] www.analog.com

Evaluation Board for the ADP1853 Step-Down DC-to-DC Controller

FEATURES

Input voltage range: 9 V to 15 V
Output voltage: 3.3 V
Output current: up to 20 A
Switching frequency: 300 kHz
Operates in PWM or PSM
Designed for evaluation of the ADP1853 functionality
Flexible and easy to re-configure and modify

EVALUATION BOARD DESCRIPTION

This document describes the design, operation, and test
results of the ADP1853-EVAL Z. The input voltage range for
this evaluation board is 9 V to 15 V, an d t h e regulated output
voltage V
up to 20 A. The switching frequency (f
achieve high efficiency.

is set to 3.3 V with the maximum output current

OUT

) of 300 kHz is set to

SW

ADP1853 DEVICE DESCRIPTION

The ADP1853 is a step-down switching controller with inte­grated drivers for N-channel synchronous power MOSFETs.
The switching frequency of the ADP1853 can be synchronized
to an external clock signal applied to the SYNC input. The

ADP1853 has a clock output, CLKOUT, which can be used

for synchronizing other controllers. The CLKOUT frequency
is the same as the switching and it is 180° out of phase.

In addition, the boost diode is integrated into the ADP1853,
thus lowering the overall system cost and component count.
The ADP1853 can be set to operate in pulse skip, high effi-
ciency mode (PSM) under light load, or in PWM continuous
conduction mode.

The ADP1853 includes externally adjustable soft start, output
overvoltage protection, externally programmable current limit,
power good, tracking function, and a programmable oscillator
frequency that ranges from 200 kHz to 1.5 MHz. The ADP1853
has the reference voltage accuracy of ±1% from −40°C to +125°C
junction temperature. This controller can be powered from a

2.75 V to 20 V supply and is available in a 20-lead 4 mm ×
4 mm LFCSP package.

ADP1853 EVALUATION BOARD

Figure 1.

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 12

UG-431 ADP1853-EVALZ User Guide

TABLE OF CONTENTS

Features .............................................................................................. 1

Evaluation Board Description......................................................... 1

ADP1853 Device Description ......................................................... 1

ADP1853 Evaluation Board ............................................................ 1

Revision History ............................................................................... 2

Component Design .......................................................................... 3

ADIsimPower Design Tool ......................................................... 3

Inductor Selection ........................................................................ 3

Input Capacitors ........................................................................... 3

REVISION HISTORY

6/12—Revision 0: Initial Version

Output Capacitors .........................................................................3

MOSFET Selection ........................................................................3

Test Results .........................................................................................4

Evaluation Board Operating Instruction .......................................5

Other Information About the Evaluation Board PCB Layout .... 6

Evaluation Board Schematics and Artwork ...................................7

Ordering Information .................................................................... 10

Bill of Materials ........................................................................... 10

Rev. 0 | Page 2 of 12

ADP1853-EVALZ User Guide UG-431

COMPONENT DESIGN

ADIsimPower DESIGN TOOL

The ADP1853 is supported by the ADIsimPower™ design tool
set. ADIsimPower is a collection of tools that produce complete
power designs optimized to a specific design goal. The tools
allow the user to generate a full schematic, bill of materials, and
calculate performance in minutes. ADIsimPower can optimize
designs for cost, area, efficiency, and parts count while taking
into consideration the operating conditions and limitations of
the IC and all real external components. The ADIsimPower
tool can be found at www.analog.com/ADIsimPower and the
user can request an unpopulated board through the tool.

For information about selecting power components and calcu­lating component values, see also the ADP1853 data sheet.

INDUCTOR SELECTION

The selected inductor is a Coilcraft SER1412-102ME with 1 µH
inductance, and 32 A saturation current. This shielded inductor
with a flat wire windings core provides exceptionally low DCR
of 1.3 mΩ (typical).

INPUT CAPACITORS

Because of the low ESR and high input current rating of a multi­layer ceramic capacitor (MLCC), a 10 µF MLCC is selected as
the input capacitor close to the high-side power MOSFET. In
addition, a 150 µF bulk OS-CON™ capacitor (aluminum solid
capacitor with conductive polymer) from Sanyo is chosen for
filtering out any unwanted low frequency noise from the input
power supply.

OUTPUT CAPACITORS

A combination of a 330 µF POSCAP™ polymer capacitor and a
22 µF MLCC is selected for the output rail. Polymer capacitors
have low ESR and high current ripple rating. Connecting poly­mer capacitors and MLCCs in parallel is very effective in
reducing voltage ripple.

MOSFET SELECTION

For low output or low duty cycle, select a high-side MOSFET
with fast rise and fall times and with low input capacitance
to minimize charging and switching power loss. As for the
synchronous rectifier (low-side MOSFET), select a MOSFET
with low R
during the switching cycle and contributes larger portion in
the conductive losses than the high-side MOSFET. For the
high-side MOSFET, the BSC052N03LS from Infineon in the
PG-TDSON-8 package is selected. This part has low input
capacitance (770 pF typical) and fast transition times (typical
turn-on delay is 2.4 ns). For the low-side MOSFET, the BSC090NS
from Infineon, with the R

4.5 V) is selected.

because it conducts current most of the time

DSON

of 3.5 mΩ (maximum at VGS of

DSON

Rev. 0 | Page 3 of 12

UG-431 ADP1853-EVALZ User Guide

100

EFFICIENCY (%)

0.05

–0.05

9 10 11 15141312

LINE REGULATION (%)

INPUT VOLTAGE (V)

–0.04

–0.03

–0.02

–0.01

0

0.01

0.02

0.03

0.04

10831-003

0.4

0.2

–0.6

–0.4

–0.2

0 10 155 20

LOAD REGULATION (%)

LOAD CURRENT ( A)

0

10831-004

CH1 5V

B

W

CH3 10V

B

W

CH2 100mV

B

W

CH4 5V

B

W

M10µs
A CH4 2.6V

625MS/s 1.6ns/pt

3

1

2

4

DH

DL

VOUT_AC

CLKOUT

10831-005

CH1 5V

B

W

CH3 10V

B

W

CH2 200mV

B

W

CH4 5V

B

W

M2µs
A CH1 2.9V

1.25GS/s IT 40.0ps/pt

3

1

2

4

SW

CLKOUT

VOUT_AC

SYNC

10831-006

CH2 200mV

B

W

CH4 5A Ω

B

W

M100µs
A CH4 14.4A

125MS/s 8.0ns/pt

2

4

VOUT_AC

LOAD CURRENT

10831-007

TEST RESULTS

TA = 25°C.

90

80

70

60

50

40

30

20

10

0

0.1 101 100

Figure 2. Efficiency, VIN = 12 V, V

LOAD (A)

= 3.3 V, f

OUT

PULSE SKIP
FORCED PW M

= 300 kHz

OSC

10831-002

Figure 5. Switching Waveforms, Light Load of 0.5 A,

f

= 300 kHz, Pulse Skip Enabled, SYNC Low

OSC

Figure 3. Line Regulation, V

Figure 4. Load Regulation, V

= 3.3 V, fSW = 300 kHz, 20 A Load

OUT

= 12 V, V

IN

= 3.3 V, fSW = 300 kHz

OUT

Rev. 0 | Page 4 of 12

Figure 6. Switching Waveforms, 20 A Load, f

Figure 7. V

Transient Response, 20 A to 10 A Load Step

OUT

= 300 kHz

SYNC

ADP1853-EVALZ User Guide UG-431

V

Deviation upon Step Load Release

5% with 10 A step load

EVALUATION BOARD OPERATING INSTRUCTION

1. Connect Jumper JP2 (EN) with a shunt to the low position

(disabled)

2. Connect Jumper JP1 (FRQ) with a shunt to the low

position for 300 kHz operation.

3. Connect Jumper JP5 (SYNC) with a shunt to the high

position for PWM operation or to the low position for
pulse skip operation at light load.

Table 1. Jumper Description

Default Factory

Jumper Description

JP1 FRQ Low Connect shunt low for 300 kHz or high for 600 kHz switching frequency operation.

JP2 EN Low Connect shunt high to enable the ADP1853 or low to disable it.
JP5 SYNC Low Connect shunt high for PWM or low for pulse skip operation. For synchronization, remove the

Setting Function

The ADP1853-EVALZ is configured for operation at 300 kHz. Connect JP1 low.

shunt from JP5 and apply an external clock to the TP12 SYNC.

Table 2. Performance Summary (TA = 25°C)

Parameter Condition

VIN 9 V to 15 V
fSW Switching frequency, 300 kHz
V

3.3 V

OUT

I

0 A to 20 A

OUT

V

Ripple, DC Load 90 mV at 20 A load

OUT

OUT

4. Connect a power supply to the board input terminals

VIN+ and GND and apply 12 V.

5. Connect Jumper JP2 (EN) to the high position to enable

the ADP1853.

Rev. 0 | Page 5 of 12

UG-431 ADP1853-EVALZ User Guide

OTHER INFORMATION ABOUT THE EVALUATION BOARD PCB LAYOUT

As seen in Figure 1, the layout of this evaluation board is not
optimized for the smallest PCB area. It is laid out in such a way
that any of the components can be desoldered and replaced
easily with different components by using a hand soldering
iron so that the user can modify the existing design without
acquiring a new PCB layout. The physical size of the compensa­tion components is 0603, which is selected for its ease of hand
soldering when reworking the board is needed. The size of these
components can be smaller in an actual design. Note that there
are extra place holders for the output filter capacitors, high-side
and low-side MOSFETs, and the input ceramic decoupling
capacitor. The user can remove, add, or change any of these

power components, including the inductor, to achieve a
particular design objective. The track function, where TRK
is pulled up to VCCO through a 100 kΩ resistor (R4), is not
used on this evaluation board. If a tracking function is needed,
the user can remove the resistor, R4, and place a resistor divider
(R8/R9) to configure the desired tracking function. To study
the precision enable function, remove the shunt for JP2 and
apply an external voltage to TP2 EN. To program higher
UVLO threshold, place the required resistor divider (R3/R5).

See Figure 8, the evaluation board schematic, for more
information.

Rev. 0 | Page 6 of 12

ADP1853-EVALZ User Guide UG-431

VOUT = 3.3V 20A

Vin = 9V to 15V

fsw = 300KHz

DL

VOUT+

PGOOD

CLKOUT

VOUT+

SYNC

EN

DH

AGND

SW

VCC

VIN+

VCC

VIN+

VCC

VOUT+

VIN+

VCC

VIN+

VIN+

R6 232KR6 232K

TP18

TP18

1

T4

TURRET

T4

TURRET

1

C19

1500pF

C19

1500pF

C8

NP

C8

NP

C6 0.1UF

C6 0.1UF

TP13

TP13

1

TP5TP5

1

C4

NP

C4

NP

R3

NP

R3

NP

T8

TURRET

T8

TURRET

1

Q3

BSC0902NS

Q3

BSC0902NS

S1

S2

S3

G D4

D3

D2

D1

R172R17

2

C9 680pF

C9 680pF

R11

1.87K

R11

1.87K

JP5

2 Way Link

JP5

2 Way Link

1

3

2

TP8

TP8

1

JP8JP8

L1 1.0uH

L1 1.0uH

PAD

U1

ADP1853ACPZ-R7

PAD

U1

ADP1853ACPZ-R7

EN

1

SYNC

6

VIN

8

VCCO

9

SS

2

FB

3

CS

12

BST

15

PGOOD

17

ILIM

16

DL

11

PGND

10

DH

14

SW

13

COMP4AGND

5

RAMP

18

CLKOUT

7

TRK

20

FREQ

19

JP2

2 Way Link

JP2

2 Way Link

1

3

2

C7 0.1UF

C7 0.1UF

R7

NP

R7

NP

+

C12

330uF

+

C12

330uF

R1NPR1

NP

R29

2

R29

2

R24

0.003/ 2W

R24

0.003/ 2W

C5

10uF/25V

C5

10uF/25V

R12

2

R12

2

R23

NP

R23

NP

R190R19

0

T6

TURRETT6TURRET

1

R15 37.4K

R15 37.4K

R25 0

R25 0

Q1

NP

Q1

NP

S1

S2

S3

G

D4

D3

D2

D1

+

C18

NP

+

C18

NP

T10

TURRET

T10

TURRET

1

T5T5

1

2

3

4

R16 NP

R16 NP

TP2

TP2

1

C20

1.0uF

C20

1.0uF

R10

0

R10

0

C23

1UF

C23

1UF

R18

20K

R18

20K

TP16

TP16

1

TP1TP1

1

R21

4.42K

R21

4.42K

R4

100K

R4

100K

R9

NP

R9

NP

T1T1

1

2

3

4

TP9

TP9

1

TP12TP12

1

Q2

BSC052N03LS

Q2

BSC052N03LS

S1

S2

S3

G

D4

D3

D2

D1

Q4

NP

Q4

NP

S1

S2

S3

G D4

D3

D2

D1

C16

22uF/10V

C16

22uF/10V

R5NPR5

NP

TP3

TP3

1

T9

TURRET

T9

TURRET

1

R14

20

R14

20

TP15

TP15

1

R13NPR13

NP

R26

0

R26

0

R8 NP

R8 NP

C15

22PF

C15

22PF

TP11

TP11

1

C10 27pF

C10 27pF

C17

NP

C17

NP

R20

22K

R20

22K

T2

TURRET

T2

TURRET

1

TP14

TP14

1

JP1

2 Way Link

JP1

2 Way Link

1

3

2

+

C1

150uF/20V

+

C1

150uF/20V

T3

T3

1

2

3

4

TP10

TP10

1

TP6

TP6

1

T7

T7

1

2

3

4

10831-008

EVALUATION BOARD SCHEMATICS AND ARTWORK

Figure 8. Evaluation Board Schematic

Rev. 0 | Page 7 of 12

UG-431 ADP1853-EVALZ User Guide

10831-009

10831-010

Figure 9. Top Layer with Silkscreen

Figure 10. Second Layer (AGND Plane)

Rev. 0 | Page 8 of 12

ADP1853-EVALZ User Guide UG-431

10831-011

10831-012

, V

, V

Figure 11. Third Layer (V

IN

CCO

, and PGND)

OUT

Figure 12. Bottom Layer

Rev. 0 | Page 9 of 12

UG-431 ADP1853-EVALZ User Guide

1

C16

Capacitor ceramic 22 µF 10 V X5R 1210

Murata

GRM32ER61A226KE20L

1

Q4

Open

4

T1, T3, T5, T7

Terminal screw vertical PC MNT

Keystone Electronics Corp.

8191K-ND

ORDERING INFORMATION

BILL OF MATERIALS

Table 3.

Qty Reference Designator Description Manufacturer Part No.

1 C1 OS-CON 150 µF 20 V Sanyo 20SEP150M
2 C4 Open
1 C5 Capacitor ceramic 10 µF 25 V 10% X7R 1210 Murata GRM32DR71E106KA12
2 C6, C7 Capacitor ceramic 0.1 µF 25 V 10% X7R 0603 Murata GRM188R71E104KA01D
1 C8 Open
1 C9 Capacitor ceramic 680 pF X7R 0603 Murata GRM188R71H681KA01D
1 C10 Capacitor ceramic 27 pF C0G/NP0 0603 Murata GRM1885C1H270JA01D
1 C12 POSCAP 330 µF 6.3 V 15 mΩ Sanyo 6TPE330MFL
1 C15 Capacitor ceramic 22 pF C0G/ NP0 0603 Murata GRM1885C1H220JA01D

1 C17 Open
1 C18 Open
1 C19 Capacitor ceramic 1500 pF X7R 0603 Murata GRM188R71H152KA01D
2 C20, C23 Capacitor ceramic 1 µF 25 V X7R 0603 Murata GRM188R71E105KA12D
3 JP1, JP2, JP5 Jumper, Header 3, 0.100' Samtec TSW-150-07-G-S
1 JP8 Solder bridge
1 L1 Inductor 1.0 µH 1.3 mΩ, I
1 Q1 Open
1 Q2 N MOSFET, 30 V, 5.2 mΩ Infineon BSC052N03LS
1 Q3 N MOSFET, 30 V, 2.6 mΩ Infineon BSC0902NS

= 32 A, I

SAT

= 37 A Coilcraft SER1412-102ME

RMS

9 R1, R3, R5, R7, R8, R9,

R13, R16, R23
1 R4 Resistor 100 kΩ 1/10W 5% 0603 Vishay CRCW0603100KFKEA
1 R6 Resistor 232 kΩ 1% Vishay CRCW0603232KFKEA
4 R10, R19, R25, R26 Resistor 0 Ω Vishay CRCW06030000Z0EA
1 R11 Resistor 1.87 kΩ 1% Vishay CRCW06031K87FKEA
3 R12, R17, R29 Resistor 2.0 Ω 1% Vishay CRCW0602R00FKEA
1 R14 Resistor 20 Ω Vishay CRCW060320R0FKEA
1 R15 Resistor 37.4 kΩ 1% Vishay CRCW060337K4FKEA
1 R18 Resistor 20 kΩ 1% Vishay CRCW060320K0FKEA
1 R20 Resistor 22 kΩ 1% Vishay CRCW060322K0FKEA
1 R21 Resistor 4.42 kΩ 1% Vishay CRCW06034K42FKEA
1 R24 Resistor.003 Ω 2 W 1% 2512 SMD ROHM PMR100HZPFV3L00
15 TP1, TP2, TP3, TP5, TP6, TP8,

TP9, TP10, TP11, TP12, TP13,

TP14, TP15, TP16, TP18

6 T2, T4, T6, T8, T9, T10 TURRET170 Keystone Electronics Corp. 1502-1
1 U1 Device under test, 20LD LFCSP Analog Devices ADP1853ACPZ-R7
3 Shunt Samtec SNT-100-BK-G
4 Standoff HEX .500/4 NYL Keystone Electronics Corp. 1902C
4 Screw NYL slot Richco NSS-4-6-01

Open

Test points, header 0.100" Samtec TSW-150-07-G-S

Rev. 0 | Page 10 of 12

ADP1853-EVALZ User Guide UG-431

NOTES

Rev. 0 | Page 11 of 12

UG-431 ADP1853-EVALZ User Guide

NOTES

ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions

By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions
set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you
have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc.
(“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal,
temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided
for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional
limitations: Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) permit any Third Party to access the Evaluation Board. As used herein, the term
“Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly granted herein, including
ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may
not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to
promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any
occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board.
Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice
to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO
WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED
TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL
PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF
THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE
AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable
United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of
Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby
submits to the pers onal jurisdiction and venu e of such courts. The United Nations Conventi on on Contracts for the Internation al Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

©2012 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
UG10831-0-6/12(0)

Rev. 0 | Page 12 of 12