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.
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.
o
o
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o
o
o
o
o
o
o
o
o
Features
Dual Output Voltages (+ and -)
Adjustable Up to +24V and Down to -10V at 5.5V
IN
Output Short/Overload Protection
True Shutdown on Both Outputs
Controlled Inrush Current During Soft-Start
Selectable Power-On Sequencing
Up to 90% Efficiency
1µA Shutdown Current
1MHz Fixed-Frequency PWM Operation
Fault-Condition Flag
Thermal Shutdown
Small, 3mm x 3mm, 14-Pin TDFN Package
Ordering Information
PART
TEMP
RANGE
-40°C to
+85°C
-40°C to
+85°C
-40°C to
+85°C
PIN-
TOP
PACKAGE MARK
14 TDFN
14 TDFN
14 TDFN
ABG
ABH
AKT
ILIM
BST/
INV
0.44/
0.33
0.8/
0.75
0.8/
0.75
MAX8614AETD+
MAX8614BETD+
MAX8614BETD/V+
Applications
CCD Bias Supplies and OLED Displays
Digital Cameras
Camcorders and Portable Multimedia
PDAs and Smartphones
+Denotes
a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part that conforms to AEC-Q100.
Typical Operating Circuit
INPUT
(2.7V TO 5.5V)
True Shutdown is a trademark of Maxim Integrated Products, Inc.
Pin Configuration
ONINV
PGND
LXN
PVP
V
CC
ONINV
ONBST
LXN
V
INV
-7.5V
TOP VIEW
SEQ
LXP
V
CC
AVCC
14
13
12
11
10
9
8
REF
MAX8614A
MAX8614B
FBN
PVP
REF
MAX8614A
MAX8614B
+
1
ONBST
2
FBN
3
AVCC
4
REF
5
GND
6
FLT
7
FBP
AVCC
SEQ
LXP
FLT
GND
PGND
FBP
V
BST
+15V
TDFN
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4014; Rev 2; 6/14
MAX8614A/MAX8614B
Dual-Output (+ and -) DC-DC
Converters for CCD
ABSOLUTE MAXIMUM RATINGS
V
CC
, AVCC to GND ..................................................-0.3V to +6V
LXN to V
CC
.............................................................-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 ................................................-0.3V to (V
CC
+ 0.3)V
AVCC to V
CC
.........................................................-0.3V to +0.3V
PGND to GND .......................................................-0.3V to +0.3V
Continuous Power Dissipation (T
A
= +70°C Multilayer Board)
14-Pin 3mm x 3mm TDFN (derate 18.2mW/°C above
T
A
= +70°C) ............................................................1454.4mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V
CC
= V
AVCC
= V
ONINV =
V
ONBST
= 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 4.7µF, Figure 1,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
AVCC and V
CC
Voltage Range
UVLO Threshold
UVLO Hysteresis
Step-Up Output-Voltage Adjust Range
Inverter Output-Voltage Adjust Range
LXP Current Limit
LXP Short-Circuit Current Limit
LXN Current Limit
LXN On-Resistance
LXP On-Resistance
PVP On-Resistance
Maximum Duty Cycle
Quiescent Current (Switching, No Load)
Quiescent Current (No Switching, No Load)
Shutdown Supply Current
FBP Line Regulation
FBN Line Regulation
V
INV
- V
CC
(Note 2)
MAX8614B
MAX8614A
MAX8614B
MAX8614A
MAX8614B
MAX8614A
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
Step-up and inverter
I
AVCC
I
VCC
I
AVCC
I
VCC
T
A
= +25°C
T
A
= +85°C
V
CC
= 2.7V to 5.5V
V
CC
= 2.7V to 5.5V
82
V
AVCC
-16
0.7
0.34
0.90
0.52
0.65
0.28
0.8
0.44
1.05
0.61
0.75
0.33
0.6
0.625
0.15
90
0.75
2
400
8
0.1
0.1
-20
20
1.4
3
800
15
5
0.3
%
mA
μA
μA
mV/D
mV/
(D - 0.5)
(Note 1)
V
CC
rising
CONDITIONS
MIN
2.7
2.42
2.55
25
24
0
0.9
0.52
1.20
0.70
0.85
0.38
1.1
TYP
MAX
5.5
2.66
UNITS
V
V
mV
V
V
A
A
A
2
Maxim Integrated
MAX8614A/MAX8614B
Dual-Output (+ and -) DC-DC
Converters for CCD
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= V
AVCC
= V
ONINV =
V
ONBST
= 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 4.7µF, Figure 1,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
FBP Load Regulation
FBN Load Regulation
Oscillator Frequency
Soft-Start Interval
Overload-Protection Fault Delay
FBP, FBN, REFERENCE
REF Output Voltage
REF Load Regulation
REF Line Regulation
FBP Threshold Voltage
FBN Threshold Voltage
FBP Input Leakage Current
FBN Input Leakage Current
LXN Input Leakage Current
LXP Input Leakage Current
PVP Input Leakage Current
FLT
Input Leakage Current
FLT
Input Resistance
ONINV, ONBST, SEQ LOGIC INPUTS
Logic-Low Input
Logic-High Input
Bias Current
2.7V < V
AVCC
< 5.5V
2.7V < V
AVCC
< 5.5V
T
A
= +25°C
0.5
1.6
0.1
1
V
V
μA
No load
0μA < I
REF
< 50μA
3.3V < V
AVCC
< 5.5V
No load
No load
V
FBP
=1.025V
FBN = -10mV
V
LXN
= -12V
V
LXP
= 23V
V
PVP
= 0V
V
FLT
= 3.6V
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
T
A
= +25°C
T
A
= +85°C
-1
-5
-5
-5
-50
0.995
-10
-50
1.24
1.25
10
2
1.010
0
+5
+5
+5
+5
+0.1
+0.1
+0.1
+0.1
+0.1
+0.1
+0.1
+0.1
10
20
+1
+5
+5
+5
+50
5
1.025
+10
+50
1.26
V
mV
mV
V
mV
nA
nA
μA
μA
μA
μA
Step-up and inverter
CONDITIONS
I
LXP
= I
ILIMMIN
, MAX8614B
I
LXP
= I
ILIMMIN
, MAX8614A
I
LXN
= I
ILIMMIN
, MAX8614B
I
LXN
= I
ILIMMIN
, MAX8614A
0.93
MIN
TYP
-15
-35
17.5
65
1
10
100
1.07
MAX
UNITS
mV/A
mV/A
MHz
ms
ms
Fault mode, T
A
= +25°C
Maxim Integrated
3
MAX8614A/MAX8614B
Dual-Output (+ and -) DC-DC
Converters for CCD
ELECTRICAL CHARACTERISTICS
(V
CC
= V
AVCC
= V
ONINV =
V
ONBST
= V
EN
= 3.6V, PGND = SEQ = GND, C6 = 0.22µF, C1 = 2.2µF, C2 = 6.7µF, Figure 1,
T
A
= -40°C
to +85°C,
unless otherwise noted.) (Note 3)
PARAMETER
AVCC = V
CC
Voltage Range
UVLO Threshold
Step-Up Output Voltage Adjust Range
Inverter Output Voltage Adjust Range
LXP Current Limit
LXP Short-Circuit Current Limit
LXN Current Limit
LXN On-Resistance
PVP On-Resistance
Maximum Duty Cycle
Quiescent Current (Switching, No Load)
Quiescent Current (No Switching, No Load)
Oscillator Frequency
FBP, FBN, REFERENCE
REF Output Voltage
FBP Threshold Voltage
FBN Threshold Voltage
ONINV, ONBST SEQ LOGIC INPUTS
Logic-Low Input
Logic-High Input
2.7V < V
AVCC
< 5.5V
2.7V < V
AVCC
< 5.5V
1.6
0.5
V
V
No load
No load
No load
1.235
0.995
-10
1.260
1.025
+10
V
V
mV
V
INV
- V
CC
(Note 2)
MAX8614B
MAX8614A
MAX8614B
MAX8614A
MAX8614B
MAX8614A
V
CC
= 3.6V
V
CC
= 3.6V
Step-up and inverter
I
AVCC
I
VCC
I
AVCC
I
VCC
0.93
82
1.4
3
800
15
1.07
(Note 1)
V
CC
rising
CONDITIONS
MIN
3
2.42
V
AVCC
-16
0.7
0.34
0.9
0.52
0.65
0.28
TYP
MAX
5.5
2.82
24
0
0.9
0.52
1.2
0.70
0.85
0.38
1.1
0.3
%
mA
μA
MHz
UNITS
V
V
V
V
A
A
A
Note 1:
Output current and on-resistance are specified at 3.6V input voltage. The IC operates to 2.7V with reduced performance.
Note 2:
The specified maximum negative output voltage is referred to V
CC
, and not to GND. With V
CC
= 3.3V, the maximum negative
output is then -12.7V.
Note 3:
Specifications to -40°C are guaranteed by design, not production tested.
4
Maxim Integrated
MAX8614A/MAX8614B
Dual-Output (+ and -) DC-DC
Converters for CCD
Typical Operating Characteristics
(T
A
= +25°C, V
CC
= V
AVCC
= 3.6V, SEQ = GND, Figure 1, unless otherwise noted.)
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX8614A/B toc01
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX8614A/B toc02
POSITIVE OUTPUT EFFICIENCY
vs. OUTPUT CURRENT
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
L = 2.2μH, C = 2.2μF
0.1
1
10
OUTPUT CURRENT (mA)
100
V
CC
= 3V
V
CC
= 3.6V
V
CC
= 4.2V
V
CC
= 5V
MAX8614A/B toc03
350
MAXIMUM OUTPUT CURRENT (mA)
300
V
OUT
= 10V
250
200
150
100
50
V
OUT
= 20V
0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
5.0
V
OUT
= 15V
300
MAXIMUM OUTPUT CURRENT (mA) .
250
200
150
100
V
INV
= -10V
50
0
V
INV
= -7.5V
V
INV
= -5V
100
0
2.5
3.0
3.5
4.0
4.5
INPUT VOLTAGE (V)
5.0
5.5
5.5
POSITIVE OUTPUT EFFICIENCY
vs. OUTPUT CURRENT
MAX8614A/B toc04
NEGATIVE OUTPUT EFFICIENCY
vs. OUTPUT CURRENT
MAX8614A/B toc05
NEGATIVE OUTPUT EFFICIENCY
vs. OUTPUT CURRENT
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
V
CC
= 4.2V
V
CC
= 5V
V
CC
= 3.6V
V
CC
= 3V
MAX8614A/B toc06
100
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0.1
V
CC
= 5V
100
90
80
70
EFFICIENCY (%)
60
50
40
30
20
V
CC
= 3.6V
V
CC
= 3V
100
V
CC
= 3.6V
V
CC
= 4.2V
V
CC
= 3V
V
CC
= 4.2V
V
CC
= 5V
L = 10μH, C = 10μF
1
10
OUTPUT CURRENT (mA)
100
10
0
0.1
L = 4.7μH, C = 4.7μF
1
10
OUTPUT CURRENT (mA)
100
0
0.1
L = 10μH, C = 10μF
1
10
OUTPUT CURRENT (mA)
100
OUTPUT EFFICIENCY
vs. OUTPUT CURRENT
MAX8614A/B toc07
OUTPUT EFFICIENCY
vs. OUTPUT CURRENT
V
CC
= 5V
90
80
70
EFFICIENCY (%)
V
CC
= 4.2V
V
CC
= 3V
V
CC
= 3.6V
MAX8614A/B toc08
100
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0.1
1
10
OUTPUT CURRENT (mA)
BOTH OUTPUTS LOADED EQUALLY
L1 = 2.2μH, C1 = 2.2μF, L2 = 4.7μH, C2 = 4.7μF
V
CC
= 3.6V
V
CC
= 3V
V
CC
= 4.2V
V
CC
= 5V
100
60
50
40
30
20
10
0
BOTH OUTPUTS LOADED EQUALLY
L1 = 10μH, C1 = 10μF, L2 = 10μH, C2 = 10μF
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
100
Maxim Integrated
5
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