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MAX765ESA+T

P1-P3P4-P6P7-P9P10-P12
_______________General Description
The MAX764/MAX765/MAX766 inverting switching regu-
lators are highly efficient over a wide range of load cur-
rents, delivering up to 1.5W. A unique, current-limited,
pulse-frequency-modulated (PFM) control scheme com-
bines the benefits of traditional PFM converters with the
benefits of pulse-width-modulated (PWM) converters.
Like PWM converters, the MAX764/MAX765/MAX766 are
highly efficient at heavy loads. Yet because they are PFM
devices, they use less than 120µA of supply current (vs.
2mA to 10mA for a PWM device).
The input voltage range is 3V to 16V. The output volt-
age is preset at -5V (MAX764), -12V (MAX765), or -15V
(MAX766); it can also be adjusted from -1V to -16V
using two external resistors (Dual Mode
TM
). The maxi-
mum operating V
IN
- V
OUT
differential is 20V.
These devices use miniature external components; their
high switching frequencies (up to 300kHz) allow for less
than 5mm diameter surface-mount magnetics. A stan-
dard 47µH inductor is ideal for most applications, so no
magnetics design is necessary.
An internal power MOSFET makes the MAX764/MAX765/
MAX766 ideal for minimum component count, low- and
medium-power applications. For increased output drive
capability or higher output voltages, use the
MAX774/MAX775/MAX776 or MAX1774, which drive an
external power P-channel MOSFET for loads up to 5W.
________________________Applications
LCD-Bias Generators
Portable Instruments
LAN Adapters
Remote Data-Acquisition Systems
Battery-Powered Applications
____________________________Features
♦ High Efficiency for a Wide Range of Load Currents
♦ 250mA Output Current
♦ 120µA Max Supply Current
♦ 5µA Max Shutdown Current
♦ 3V to 16V Input Voltage Range
♦ -5V (MAX764), -12V (MAX765), -15V (MAX766),
or Adjustable Output from -1V to -16V
♦ Current-Limited PFM Control Scheme
♦ 300kHz Switching Frequency
♦ Internal, P-Channel Power MOSFET
______________Ordering Information
Ordering Information continued on last page.
* Dice are tested at T
A
= +25°C, DC parameters only.
**Contact factory for availability and processing to MIL-STD-883.
MAX764/MAX765/MAX766
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low I
Q
DC-DC Inverters
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
LX
V+
V+
GND
REF
SHDN
FB
OUT
MAX764
MAX765
MAX766
DIP/SO
TOP VIEW
__________________Pin Configuration
GND
MAX764
SHDN
LX
OUT
ON/OFF
REF
47µH
OUTPUT
-5V
INPUT
3V TO 15V
V+
FB
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0176; Rev 0; 6/94
PART
MAX764CPA
MAX764CSA
MAX764C/D 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
MAX764EPA
MAX764ESA -40°C to +85°C
-40°C to +85°C 8 Plastic DIP
8 SO
MAX764MJA -55°C to +125°C 8 CERDIP**
MAX765CPA
MAX765CSA
MAX765C/D 0°C to +70°C
0°C to +70°C
0°C to +70°C 8 Plastic DIP
8 SO
Dice*
MAX765EPA
MAX765ESA -40°C to +85°C
-40°C to +85°C 8 Plastic DIP
8 SO
MAX765MJA -55°C to +125°C 8 CERDIP**
Evaluation Kit
Available
MAX764/MAX765/MAX766
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low I
Q
DC-DC Inverters
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 5V, I
LOAD
= 0mA, C
REF
= 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°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.
V+ to GND..............................................................-0.3V to +17V
OUT to GND...........................................................+0.5V to -17V
Maximum Differential (V+ to OUT) ......................................+21V
REF, SHDN, FB to GND ...............................-0.3V to (V+ + 0.3V)
LX to V+..................................................................+0.3V to -21V
LX Peak Current ...................................................................1.5A
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C) .........................471mW
CERDIP (derate 8.00mW/°C above +70°C) .................640mW
Operating Temperature Ranges
MAX76_C_A ........................................................0°C to +70°C
MAX76_E_A .....................................................-40°C to +85°C
MAX76_MJA ..................................................-55°C to +125°C
Maximum Junction Temperatures
MAX76_C_A/E_A ..........................................................+150°C
MAX76_MJA .................................................................+175°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
3V ≤ V+ ≤ 16V
V+ = 16V, SHDN = 0V or V+
V+ = 16V, SHDN < 0.4V
4V ≤ V+ ≤ 6V
0mA ≤ I
LOAD
≤ 100mA
MAX76_M
3V ≤ V+ ≤ 16V
MAX76_C/E
0µA ≤ I
REF
≤ 100µA
MAX76_M
MAX765C/E, -11.52V ≤ V
OUT
≤ 12.48V
MAX764, -4.8V ≤ V
OUT
≤ 5.2V
MAX76_E
MAX76_C
MAX76_M
MAX76_E
V+ = 16V, SHDN > 1.6V
V+ = 10V, SHDN > 1.6V
3V ≤ V+ ≤ 16V
MAX766, -14.40V ≤ V
OUT
≤ -15.60V
MAX76_C
MAX765M, -11.52V ≤ V
OUT
≤ 12.48V
CONDITIONS
V1.6V
IH
SHDN Input Voltage High
µA±1SHDN Leakage Current
80
%/V0.12Line Regulation (Note 2)
%/mA0.008Load Regulation (Note 2)
µV/V40 100REF Line Regulation
415
mV
410
REF Load Regulation
1.4550 1.5 1.5450
1.4625 1.5 1.5375 V
1.4700 1.5 1.5300
V
REF
Reference Voltage
35 105
50 120
µA
90 120I
S
Supply Current
3.5
V+ V
3.0 16.0
V+ Input Voltage Range
68 120
mA
150 260
I
OUT
Output Current and Voltage
(Note 1)
±90
±70
2
I
SHDN
Shutdown Current
15
mV-10 10FB Trip Point
nA
±50
I
FB
FB Input Current
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX76_C/E
MAX76_M
V
OUT
= -5V
82V
OUT
= -15V
Efficiency (Note 2)
10mA ≤ I
LOAD
≤ 100mA,
V
IN
= 5V
%
3V ≤ V+ ≤ 16V V0.4V
IL
SHDN Input Voltage Low
MAX764/MAX765/MAX766
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low I
Q
DC-DC Inverters
_______________________________________________________________________________________ 3
Note 1: See Maximum Output Current vs. Supply Voltage graph in the
Typical Operating Characteristics
. Guarantees are based on
correlation to switch on-time, switch off-time, on-resistance, and peak current rating.
Note 2: Circuit of Figure 2.
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, I
LOAD
= 0mA, C
REF
= 0.1µF, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
I
V
OUT
I
+ (V+) ≥ 10V
I
LX
I
+ (V+) ≤ 20V
I
V
OUT
I
+ (V+) ≥ 10V
CONDITIONS
µs1.8 2.3 2.8t
OFF
Minimum Switch Off-Time
µs12 16 20t
ON
Maximum Switch On-Time
A0.5 0.75I
PEAK
Peak Current at LX
±30
±10 µA
±5
LX Leakage Current
Ω1.4 2.5LX On-Resistance
UNITSMIN TYP MAXSYMBOLPARAMETER
MAX76_C
MAX76_E
MAX76_M
__________________________________________Typical Operating Characteristics
(V+ = 5V, V
OUT
= -5V, T
A
= +25°C, unless otherwise noted.)
100
0
0.1 10 1000
MAX764
EFFICIENCY vs. LOAD CURRENT
MAX764-01
LOAD CURRENT (mA)
EFFICIENCY (%)
90
80
70
60
50
40
30
20
10
1 100
CIRCUIT OF FIGURE 2
V
OUT
= -5V
±
4%
V+ = 5V
V+ = 10V
V+ = 15V
100
0
0.1 10 1000
MAX765
EFFICIENCY vs. LOAD CURRENT
MAX764-02
LOAD CURRENT (mA)
EFFICIENCY (%)
90
80
70
60
50
40
30
20
10
1 100
V+ = 8V
V+ = 5V
CIRCUIT OF FIGURE 2
V
OUT
= -12V
±
4%
100
0
0.1 10 1000
MAX766
EFFICIENCY vs. LOAD CURRENT
MAX764-03
LOAD CURRENT (mA)
EFFICIENCY (%)
90
80
70
60
50
40
30
20
10
1 100
V+ = 5V
CIRCUIT OF FIGURE 2
V
OUT
= -15V
±
4%
P1-P3P4-P6P7-P9P10-P12

MAX765ESA+T

Mfr. #:
Buy MAX765ESA+T
Manufacturer:
Maxim Integrated
Description:
Switching Voltage Regulators 5/12/15/AdjV DC/DC Inverter
Lifecycle:
New from this manufacturer.
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