19-4014; Rev 0; 3/06
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 sup-
ply 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 pow-
ering 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 out-
put down to 16V below the input voltage. The
MAX8614B has a higher current limit than the
MAX8614A. Both devices operate at a fixed 1MHz fre-
quency to ease noise filtering in sensitive applications
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.
♦
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
Features
MAX8614A/MAX8614B
Ordering Information
PART
TEMP PIN-
RANGE PACKAGE
14 TDFN
-40°C to
3mm x 3mm
+85°C
(T1433-2)
TOP
MARK
ABG
ILIM
BST/INV
0.44/0.33
MAX8614AETD+
Applications
CCD Bias Supplies and OLED Displays
Digital Cameras
Camcorders and Portable Multimedia
PDAs and Smartphones
14 TDFN
-40°C to
3mm x 3mm
+85°C
(T1433-2)
+Denotes
lead-free package.
MAX8614BETD+
ABH
0.8/0.75
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
AV
CC
14
13
12
11
10
9
8
REF
AV
CC
SEQ
MAX8614A
MAX8614B
FBN
PVP
REF
MAX8614A
MAX8614B
+
1
ONBST
2
FBN
3
AV
CC
4
REF
5
GND
6
FLT
7
FBP
LXP
FLT
GND
PGND
FBP
V
BST
+15V
TDFN
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual-Output (+ and -) DC-DC
Converters for CCD
MAX8614A/MAX8614B
ABSOLUTE MAXIMUM RATINGS
V
CC
, AV
CC
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 (AV
CC
+ 0.3)V
PVP to GND ................................................-0.3V to (V
CC
+ 0.3)V
AV
CC
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
AV
CC
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
IV
CC
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
(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
Ω
Ω
Ω
%
mA
µA
µA
mV/D
mV/
(D - 0.5)
2
_______________________________________________________________________________________
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
1.6
0.1
1
0.5
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
Ω
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
MAX8614A/MAX8614B
Fault mode, T
A
= +25°C
_______________________________________________________________________________________
3
Dual-Output (+ and -) DC-DC
Converters for CCD
MAX8614A/MAX8614B
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
A
VCC
= 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
UNITS
V
V
V
V
A
A
A
Ω
Ω
%
mA
µA
MHz
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
_______________________________________________________________________________________
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.)
MAX8614A/MAX8614B
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
_______________________________________________________________________________________
5
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