Datasheet

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19-4014; Rev 2; 6/14

MAX8614A/MAX8614B

Dual-Output (+ and -) DC-DC

Converters for CCD

EVALUATION KIT AVAILABLE

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX8614A/MAX8614B dual-output step-up DC-DC

converters generate both a positive and negative

supply voltage that are each independently regulated.

The positive output delivers up to 50mA while the

inverter supplies up to 100mA with input voltages

between 2.7V and 5.5V. The MAX8614A/MAX8614B are

ideal for powering CCD imaging devices and displays

in digital cameras and other portable equipment.

The MAX8614A/MAX8614B generate an adjustable

positive output voltage up to +24V and a negative

output down to 16V below the input voltage. The

MAX8614B has a higher current limit than the

MAX8614A. Both devices operate at a fixed 1MHz

frequency to ease noise filtering in sensitive applica-

tions and to reduce external component size.

Additional features include pin-selectable power-on

sequencing for use with a wide variety of CCDs, True

Shutdown™, overload protection, fault flag, and internal

soft-start with controlled inrush current.

The MAX8614A/MAX8614B are available in a space-

saving 3mm x 3mm, 14-pin TDFN package and

are specified over the -40°C to +85°C extended

temperature range.

Applications

CCD Bias Supplies and OLED Displays

Digital Cameras

Camcorders and Portable Multimedia

PDAs and Smartphones

Features

o Dual Output Voltages (+ and -)

o Adjustable Up to +24V and Down to -10V at 5.5V

o Output Short/Overload Protection

o True Shutdown on Both Outputs

o Controlled Inrush Current During Soft-Start

o Selectable Power-On Sequencing

o Up to 90% Efficiency

o 1µA Shutdown Current

o 1MHz Fixed-Frequency PWM Operation

o Fault-Condition Flag

o Thermal Shutdown

o Small, 3mm x 3mm, 14-Pin TDFN Package

14 13 12 11 10

4567

LXN

PVP

PGNDREF

AVCC

FBN

ONBST

TOP VIEW

MAX8614A

MAX8614B

LXP

ONINV

SEQFBP

FLT

GND

TDFN

Pin Configuration

LXN

INPUT

(2.7V TO 5.5V)

REF

AVCC

FBN

ONINV

INV

-7.5V

MAX8614A

MAX8614B

GND PGND

ONBST

PVP

LXP

FBP

BST

+15V

REF

SEQ

FLT

Typical Operating Circuit

Ordering Information

PART

TEMP

RANGE

PIN-

PACKAGE

TOP

MARK

ILIM

BST/

INV

MAX8614AETD+

-40°C to

+85°C

14 TDFN ABG

0.44/

0.33

MAX8614BETD+

-40°C to

+85°C

14 TDFN

ABH

0.8/

0.75

MAX8614BETD/V+

-40°C to

+85°C

14 TDFN

AKT

0.8/

0.75

True Shutdown is a trademark of Maxim Integrated Products, Inc.

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part that conforms to AEC-Q100.

Summary of content (15 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD General Description The MAX8614A/MAX8614B dual-output step-up DC-DC converters generate both a positive and negative supply voltage that are each independently regulated. The positive output delivers up to 50mA while the inverter supplies up to 100mA with input voltages between 2.7V and 5.5V. The MAX8614A/MAX8614B are ideal for powering CCD imaging devices and displays in digital cameras and other portable equipment.
PAGE 2
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD ABSOLUTE MAXIMUM RATINGS VCC, AVCC to GND ..................................................-0.3V to +6V LXN to VCC .............................................................-18V to +0.3V LXP to PGND ..........................................................-0.3V to +33V REF, ONINV, ONBST, SEQ, FBN, FBP FLT to GND .........................................-0.3V to (AVCC + 0.3)V PVP to GND ................................................-0.
PAGE 3
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD ELECTRICAL CHARACTERISTICS (continued) (VCC = VAVCC = VONINV = VONBST = 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 4.7µF, Figure 1, TA = 0°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER FBP Load Regulation FBN Load Regulation CONDITIONS TYP -15 ILXN = I ILIMMIN, MAX8614B 17.
PAGE 4
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD ELECTRICAL CHARACTERISTICS (VCC = VAVCC = VONINV = VONBST = VEN = 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 6.7µF, Figure 1, TA = -40°C to +85°C, unless otherwise noted.
PAGE 5
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Typical Operating Characteristics (TA = +25°C, VCC = VAVCC = 3.6V, SEQ = GND, Figure 1, unless otherwise noted.) MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE VOUT = 15V 150 100 50 80 70 200 150 VINV = -7.5V 100 5.0 3.0 POSITIVE OUTPUT EFFICIENCY vs. OUTPUT CURRENT 0.1 MAX8614A/B toc05 100 40 70 60 VCC = 4.2V 50 VCC = 5V 40 60 40 30 20 20 20 10 10 1 10 OUTPUT CURRENT (mA) 100 0.1 1 10 OUTPUT CURRENT (mA) 0.
PAGE 6
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Typical Operating Characteristics (continued) (TA = +25°C, VCC = VAVCC = 3.6V, SEQ = GND, Figure 1, unless otherwise noted.) VCC = 5V -0.5 VCC = 4.2V -1.0 -1.5 -2.0 VCC = 3V -2.5 VCC = 3.6V -3.0 0 VOUT- = -7.5V CHANGE IN OUTPUT VOLTAGE (%) MAX8614A/B toc09 CHANGE IN OUTPUT VOLTAGE (%) 0 -0.5 VIN = 4.2V -1.5 -2.0 -2.5 VIN = 3V -3.0 VIN = 3.6V -3.5 -3.5 0 25 50 75 100 LOAD CURRENT (mA) 125 0 150 NO-LOAD SUPPLY CURRENT vs.
PAGE 7
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Typical Operating Characteristics (continued) (TA = +25°C, VCC = VAVCC = 3.6V, SEQ = GND, Figure 1, unless otherwise noted.
PAGE 8
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Typical Operating Characteristics (continued) (TA = +25°C, VCC = VAVCC = 3.6V, SEQ = GND, Figure 1, unless otherwise noted.) SWITCHING FREQUENCY vs. TEMPERATURE REFERENCE VOLTAGE vs. TEMPERATURE 1.005 1.004 FREQUENCY (kHz) 1.2480 MAX8614A/B toc22 1.2485 REFERENCE VOLTAGE (V) 1.006 MAX8614A/B toc21 1.2490 1.2475 1.2470 1.2465 1.2460 VINV = -7.5V IOUT = 100mA 1.003 1.002 1.001 1.000 VBST = +15V IOUT = 50mA 0.999 0.998 1.2455 0.
PAGE 9
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Functional Diagram ERROR AMPLIFIER MAX8614A MAX8614B PWM COMPARATOR VCC INVERTER CONTROL LOGIC LXN INVERTER CURRENT SENSE FBN ONBST ONINV FLT 1.01V BIAS AND CONTROL BLOCK REF REFERENCE 1.
PAGE 10
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Inverter The inverter generates output voltages down to -16V below VCC. An internal power switch and external catch diode allow conversion efficiencies as high as 85%. Control Scheme Both converters use a fixed-frequency, PWM currentmode control scheme.
PAGE 11
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD the inverter output, load disconnect is implemented by turning off the inverter’s internal power switch. Current-Limit Select The MAX8614B allows an inductor current limit of 0.8A on the step-up converter and 0.75A on the inverter. The MAX8614A allows an inductor current limit of 0.44A on the step-up converter and 0.33A on the inverter.
PAGE 12
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Table 1. Inductor Selection Guide OUTPUT VOLTAGES AND LOAD CURRENT 15V, 50mA -7.5V, 100mA 15V, 20mA -7.5V, 40mA INDUCTOR L (μH) DCR (mΩ) ISAT (A) SIZE (mm) TOKO DB3018C, 1069AS-2R0 2.0 72 1.4 3 x 3 x 1.8 TOKO DB3018C, 1069AS-4R3 4.3 126 0.97 3 x 3 x 1.8 TOKO S1024AS-4R3M 4.3 47 1.2 4 x 4 x 1.7 Sumida CDRH2D14-4R7 4.7 170 1 3.2 x 3.2 x 1.55 TOKO S1024AS-100M 10 100 0.8 4 x 4 x 1.
PAGE 13
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD VBATT (2.7V ~ 5V) C4 22μF VINV 13 VCC 1 ONBST 9 ONINV 2 FBN R3 187kΩ 1% R4 30.9kΩ 1% REF 3 VBATT C5 1.0μF 4 C6 0.22μF LXN L2 4.7μH AVCC PVP REF 12 C3 1μF L1 2.2μH LXP 6 FLT 10 R2 100kΩ 1% 7 FBP GND 5 SEQ D1 CMHSH5-21 VBST C1 +15V AT 50mA 2.2μF VBST R1 1.4MΩ 1% VINV C2 -7.5V AT 100mA 4.7μF MAX8614A MAX8614B R5 100kΩ FAULT D2 CMHSH5-21 14 8 PGND 11 Figure 1.
PAGE 14
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Package Information Chip Information PROCESS: BiCMOS 14 For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 15
MAX8614A/MAX8614B Dual-Output (+ and -) DC-DC Converters for CCD Revision History REVISION NUMBER REVISION DATE 2 6/14 DESCRIPTION Added MAX8614ETD/V+ to Ordering Information PAGES CHANGED 1 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time.