MAX764CSA+T ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low-IQ DC-DC InvertersFeaturesThe MAX764/MAX765/MAX766 inverting switching regu-♦ High Efficiency for a Wide Range of Loa ..
MAX764ESA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ DC-DC InvertersELECTRICAL CHARACTERISTICS(V+ = 5V, I = 0mA, C = 0.1µF, T = T to T , unless otherwise noted. Typic ..
MAX764ESA+ ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low-IQ DC-DC InvertersGeneral Description ________
MAX764ESA+T ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low-IQ DC-DC InvertersApplicationsMAX765C/D 0°C to +70°C Dice*LCD-Bias GeneratorsMAX765EPA -40°C to +85°C 8 Plastic DIPPo ..
MAX764ESA+T ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low-IQ DC-DC Invertersapplications, so no MAX764CPA 0°C to +70°C 8 Plastic DIPmagnetics design is necessary.MAX764CSA 0°C ..
MAX764ESA-T ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low-IQ DC-DC InvertersApplications A**Contact factory for availability and processing to MIL-STD-883.__________________Pi ..
MB6M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERThermal Characteristics (TA = 25°C unless otherwise noted)Parameter Symbol MB2M MB4M MB6M UnitDevic ..
MB6S ,Bridge RectifiersThermal Characteristics (T = 25°C unless otherwise noted)AParameter Symbol MB2S MB4S MB6S UnitDevic ..
MB7117E , Schottky TTL 2048-Bit Bipolar Programmable Read-Only Memory
MB71A38-25 , PROGRAMMABLE SCHOTTKY 16384-BIT READ ONLY MEMORY
MAX764CPA+-MAX764CSA+-MAX764CSA+T-MAX764ESA+-MAX764ESA+T-MAX764ESA-T-MAX765CPA+-MAX765CSA+-MAX765EPA+-MAX765ESA+-MAX765ESA+T-MAX766CSA+-MAX766ESA+-MAX766ESA+T
-5V/-12V/-15V or Adjustable, High-Efficiency, Low-IQ DC-DC Inverters
_______________General DescriptionThe 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 ModeTM). The maxi-
mum operating VIN- VOUTdifferential 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/
MAX766ideal 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.
________________________ApplicationsLCD-Bias Generators
Portable Instruments
LAN Adapters
Remote Data-Acquisition Systems
Battery-Powered Applications
____________________________FeaturesHigh Efficiency for a Wide Range of Load Currents250mA Output Current120μA Max Supply Current5μA Max Shutdown Current3V to 16V Input Voltage Range-5V (MAX764), -12V (MAX765), -15V (MAX766),
or Adjustable Output from -1V to -16VCurrent-Limited PFM Control Scheme300kHz Switching FrequencyInternal, P-Channel Power MOSFET
______________Ordering Information
Ordering Information continued on last page.* Dice are tested at TA= +25°C, DC parameters only.
**Contact factory for availability and processing to MIL-STD-883.
V/-12V/-15V or Adjustable,igh-Efficiency, Low IQDC-DC Inverters
________________________________________________________________Maxim Integrated Products1GNDREF
SHDN
OUT
MAX764
MAX765
MAX766
DIP/SOTOP VIEW
__________________Pin ConfigurationGND
MAX764
SHDN
OUT
ON/OFF
REF
47µH
OUTPUT-5V
INPUT3V TO 15V
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.19-0176; Rev 0; 6/94
PART
MAX764CPAMAX764CSA
MAX764C/D0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE8 Plastic DIP
8 SO
Dice*
MAX764EPA
MAX764ESA-40°C to +85°C
-40°C to +85°C8 Plastic DIP
8 SO
MAX764MJA-55°C to +125°C8 CERDIP**
MAX765CPAMAX765CSA
MAX765C/D0°C to +70°C
0°C to +70°C
0°C to +70°C8 Plastic DIP
8 SO
Dice*
MAX765EPA
MAX765ESA-40°C to +85°C
-40°C to +85°C8 Plastic DIP
8 SO
MAX765MJA-55°C to +125°C8 CERDIP**
Evaluation KitAvailable
-5V/-12V/-15V or Adjustable,igh-Efficiency, Low IQDC-DC Inverters_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(V+ = 5V, ILOAD= 0mA, CREF= 0.1μF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +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 (TA= +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 ≤ILOAD≤100mA
MAX76_M
3V ≤V+ ≤16V
MAX76_C/E
0μA ≤IREF≤100μA
MAX76_M
MAX765C/E, -11.52V ≤VOUT≤12.48V
MAX764, -4.8V ≤VOUT≤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 ≤VOUT≤-15.60V
MAX76_C
MAX765M, -11.52V ≤VOUT≤12.48V
CONDITIONS1.6VIHSHDN Input Voltage High±1SHDN Leakage Current
%/V0.12Line Regulation (Note 2)
%/mA0.008Load Regulation (Note 2)
μV/V40100REF Line Regulation15mV410REF Load Regulation
1.46251.51.5375V
VREFReference Voltage105120120ISSupply Current
3.5V+V3.016.0V+ Input Voltage Range120mA
IOUTOutput Current and Voltage
(Note 1)
±90
±70ISHDNShutdown Current15-1010FB Trip Point
±50
IFBFB Input Current
UNITSMINTYPMAXSYMBOLPARAMETERMAX76_C/E
MAX76_M
VOUT= -5VVOUT= -15VEfficiency (Note 2)10mA ≤ILOAD≤100mA,
VIN= 5V%
3V ≤V+ ≤16VV0.4VILSHDN Input Voltage Low
V/-12V/-15V or Adjustable,igh-Efficiency, Low IQDC-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, ILOAD= 0mA, CREF= 0.1μF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
IVOUTI+ (V+) ‡10V
ILXI+ (V+) ≤20V
IVOUTI+ (V+) ‡10V
CONDITIONS1.82.32.8tOFFMinimum Switch Off-Time121620tONMaximum Switch On-Time0.50.75IPEAKPeak Current at LX
±30
±10μA
LX Leakage Current1.42.5LX On-Resistance
UNITSMINTYPMAXSYMBOLPARAMETERMAX76_C
MAX76_E
MAX76_M
__________________________________________Typical Operating Characteristics(V+ = 5V, VOUT= -5V, TA= +25°C, unless otherwise noted.)
MAX764
EFFICIENCY vs. LOAD CURRENT
MAX764-01
LOAD CURRENT (mA)
FIC
IEN
(%100
CIRCUIT OF FIGURE 2
VOUT = -5V ±4%
V+ = 5V
V+ = 10V
V+ = 15V
MAX765
EFFICIENCY vs. LOAD CURRENT
MAX764-02
LOAD CURRENT (mA)
FIC
IEN
(%100
V+ = 8V
V+ = 5V
CIRCUIT OF FIGURE 2
VOUT = -12V ±4%
MAX766
EFFICIENCY vs. LOAD CURRENT
MAX764-03
LOAD CURRENT (mA)
FIC
IEN
(%100
V+ = 5V
CIRCUIT OF FIGURE 2
VOUT = -15V ±4%
-5V/-12V/-15V or Adjustable,igh-Efficiency, Low IQDC-DC Inverters_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)(V+ = 5V, VOUT= -5V, TA= +25°C, unless otherwise noted.)
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX764 -07
TEMPERATURE (°C)
(m
V+ = 15V
V+ = 8V
V+ = 4V
MAXIMUM SWITCH ON-TIME
vs. TEMPERATURE
MAX764 -08
TEMPERATURE (°C)
(m
V+ = 15V
V+ = 5V
MINIMUM SWITCH OFF-TIME
vs. TEMPERATURE
MAX764 -09
TEMPERATURE (°C)
ITC
(m
V+ = 5V
V+ = 15V
SWITCH ON/OFF-TIME RATIO
vs. TEMPERATURE
AX764 -10
TEMPERATURE (°C)
-TIM
(m
s/m
V+ = 5V
START-UP SUPPLY VOLTAGE
vs. OUTPUT CURRENT
AX764 -11
OUTPUT CURRENT (mA)
T-U
(V100150200250300
CIRCUIT OF FIGURE 2
10,000
LX LEAKAGE CURRENT
vs. TEMPERATUREMAX764-12
TEMPERATURE (°C)
(n
IVOUTI + (V+) = 20V
MAXIMUM OUTPUT CURRENT
vs. SUPPLY VOLTAGEAX764 -04
SUPPLY VOLTAGE (V)
T (m
VOUT = -5V
VOUT = -12V
VOUT = -15V
CIRCUIT OF FIGURE 2
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGEAX764 -05
SUPPLY VOLTAGE (V)
T (m
NO-LOAD SUPPLY CURRENT
vs. TEMPERATURE
AX764 -06
TEMPERATURE (°C)
T (m
V+ = 15V
V+ = 5V
V/-12V/-15V or Adjustable,igh-Efficiency, Low IQDC-DC Inverters_______________________________________________________________________________________5SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX764-17
SUPPLY VOLTAGE (V)
(m
100ILOAD = 100mA
ILOAD = 0mA
CIRCUIT OF FIGURE 2
REFERENCE OUTPUT RESISTANCE
vs. TEMPERATURE
MAX764 -15
TEMPERATURE (°C)
(W
IREF = 10mA
IREF = 50mA
IREF = 100mA
____________________________Typical Operating Characteristics (continued)(V+ = 5V, VOUT= -5V, TA= +25°C, unless otherwise noted.)
LX ON-RESISTANCE
vs. TEMPERATURE
MAX764 -13
TEMPERATURE (°C)
E (W
IVOUTI + (V+) = 10V
IVOUTI + (V+) = 15V
IVOUTI + (V+) = 20V
PEAK CURRENT AT LX
vs. TEMPERATURE
MAX764-14
TEMPERATURE (°C)
A
LX
(A
IVOUTI + (V+) = 20V
IVOUTI + (V+) = 15V
IVOUTI + (V+) = 10V
REFERENCE OUTPUT
vs. TEMPERATURE
MAX764 -16
TEMPERATURE (°C)
(V
1.492
-5V/-12V/-15V or Adjustable,igh-Efficiency, Low IQDC-DC Inverters_______________________________________________________________________________________CIRCUIT OF FIGURE 2, VOUT = -5V, ILOAD = 100mA
A: VOUT, 50mV/div, AC-COUPLED
B: V+, 5V TO 10V, 5V/div
5ms/div
LINE-TRANSIENT RESPONSECIRCUIT OF FIGURE 2, V+ = 5V, VOUT = -5V, ILOAD = 140mA
A: OUTPUT RIPPLE, 100mV/div
B: INDUCTOR CURRENT, 500mA/div
C: LX WAVEFORM, 10V/divs/div
DISCONTINUOUS CONDUCTION AT
HALF AND FULL CURRENT LIMIT0V
CIRCUIT OF FIGURE 2, V+ = 5V, ILOAD = 100mA, VOUT = -5V
A: VOUT, 2V/div
B: SHUTDOWN PULSE, 0V TO 5V, 5V/div
2ms/div
TIME TO ENTER/EXIT SHUTDOWNCIRCUIT OF FIGURE 2, V+ = 5V, VOUT = -5V
A: VOUT, 50mV/div, AC-COUPLED
B: ILOAD, 0mA TO 100mA, 100mA/div
5ms/div
LOAD-TRANSIENT RESPONSE0mA
____________________________Typical Operating Characteristics (continued)(V+ = 5V, VOUT= -5V, TA= +25°C, unless otherwise noted.)
