Dual-Output (Positive and Negative),
DC-DC Converter for CCD and LCD
MAX685
ABSOLUTE MAXIMUM RATINGS
V
DD
, VP to GND........................................................-0.3V to +6V
PGND to GND .......................................................-0.3V to +0.3V
V
DD
to VP...............................................................-0.3V to +0.3V
LXN, POK to GND ..................................................-0.3V to +30V
LXP to V
DD
..............................................................-15V to +0.3V
REF, SEQ,
SHDN
to GND...........................-0.3V to (V
DD
+ 0.3V)
FBP, FBN, SYNC to GND .........................................-0.3V to +6V
Continuous Power Dissipation (T
A
= +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)............667mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+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
DD
= VP = 5V,
T
A
= 0°C to +85°C
unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
Input Voltage Range
Positive Output Voltage Range
Negative Output Voltage Range
Output Current
LX Current Limit
LXP, LXN On-Resistance
Quiescent Current
Idle Quiescent Current
Line Regulation
Load Regulation
Output Voltage Ripple
SHUTDOWN (SHDN)
Shutdown Supply Current
UNDERVOLTAGE LOCKOUT
UVLO Threshold
UVLO Hysteresis
REFERENCE VOLTAGE
V
REF
Output Voltage
V
REF
Load Regulation
FB INPUTS
FBP Threshold Voltage
FBN Threshold Voltage
FBP, FBN Input Leakage Current
LOGIC INPUTS
(SEQ,
SHDN,
SYNC)
Logic-Low Input
Logic-High Input
Input Bias Current
2.7V < V
DD
< 5.5V
2.7V < V
DD
< 5.5V
0.7 x V
DD
0.1
1
0.3 x V
DD
V
V
µA
No load
No load
1.21
-16
1.24
10
±0.01
1.27
36
±0.1
V
mV
µA
No load
0 < I
REF
< 50µA
1.23
1.250
-2
1.27
V
mV
V
DD
= rising
2.35
2.5
50
2.65
V
mV
SYNC = SEQ =
SHDN
= GND
0.1
10
µA
V
DD
= 5.5V (Note 1)
V
DD
= 4.5V, V
OUT+
≥
14.25V, V
OUT-
≤
-7.125V,
Figure 3
T
A
= +25°C
V
DD
= 4.5V
SYNC = V
DD
V
FBP
= 1.35V, V
FBN
= -0.1V
V
DD
= 4.5V to 5.5V
I
OUT
= 0 to 10mA, C1 = 10µF
C3 = C4 = 10µF, I
LOAD
= 5mA
V
DD
= VP
CONDITIONS
MIN
2.7
VP
-9
10
440
0.6
0.8
300
0.2
0.13
30
500
2
TYP
MAX
5.5
24
-1.27
UNITS
V
V
V
mA
mA
Ω
mA
µA
%/V
%/mA
mVp-p
2
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
