MAX774CPA+-MAX774CSA+-MAX774ESA+-MAX774ESA+T-MAX775CSA+-MAX775CSA-T-MAX775ESA+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX775CSA-T ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC ControllersFeaturesThe MAX774/MAX775/MAX776 inverting switching ♦ 85% Efficiency for 5mA to 1A Load Currentsre ..
MAX775ESA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersGeneral Description ________
MAX775ESA+T ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC ControllersELECTRICAL CHARACTERISTICS(V+ = 5V, I = 0mA, C = 0.1µF, T = T to T , unless otherwise noted. Typica ..
MAX776 ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IApplicationsOrdering Information continued on last page.Data CommunicatorsTypical Operating Circuit ..
MAX776CPA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersFeaturesThe MAX774/MAX775/MAX776 inverting switching ' 85% Efficiency for 5mA to 1A Load Currentsre ..
MAX776CSA ,-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC ControllersMAX774/MAX775/MAX77619-0191; Rev 1; 3/94-5V/-12V/-15V or Adjustable, High-Efficiency, Low I Inverti ..
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MB71A38-25 , PROGRAMMABLE SCHOTTKY 16384-BIT READ ONLY MEMORY
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MAX774CPA+-MAX774CSA+-MAX774ESA+-MAX774ESA+T-MAX775CSA+-MAX775CSA-T-MAX775ESA+T
-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
General Description
The MAX774/MAX775/MAX776 inverting switching
regulators deliver high efficiency over three decades of
load current. A unique current-limited, pulse-
frequency modulated (PFM) control scheme provides
the benefits of pulse-width modulation (high efficiency
with heavy loads), while using less than 100µA of supply
current (vs. 2mA to 10mA for PWM converters). The result
is high efficiency over a wide range of loads.
These ICs also use tiny external components; their high
switching frequency (up to 300kHz) allows for less than
5mm diameter surface-mount magnetics.
The MAX774/MAX775/MAX776 accept input voltages from
3V to 16.5V, and have preset output voltages of
-5V, -12V, and -15V, respectively. Or, the output voltage
can be user-adjusted with two resistors. Maximum
VIN - VOUTdifferential voltage is limited only by the break-
down voltage of the chosen external switch transistor.
These inverters use external P-channel MOSFET switches,
allowing them to power loads up to 5W. If less power is
required, use the MAX764/MAX765/MAX766 inverting
switching regulators with on-board MOSFETs.
Applications
LCD-Bias Generators
High-Efficiency DC-to-DC Converters
Battery-Powered Applications
Data Communicators
Features85% Efficiency for 5mA to 1A Load CurrentsUp to 5W Output Power100µA (max) Supply Current5µA (max) Shutdown Current3V to 16.5V Input Range-5V (MAX774), -12V (MAX775), -15V (MAX776),
or Adjustable Output VoltageCurrent-Limited PFM Control Scheme300kHz Switching Frequency
Ordering Information
*Contact factory for dice specifications.
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency
Low IQInverting DC-to-DC Controllers5
MAX774
MAX775
MAX776
DIP/SO
TOP VIEW
GND
EXT
OUT
SHDN
REF
Pin Configuration
MAX774
OUTPUT
-5V
REF
SHDN
GND
EXT
OUT
ON/OFF
INPUT
3V TO 16V
Typical Operating Circuit
PARTTEMP RANGEPIN-PACKAGE
MAX774CPA0°C to +70°C8 Plastic DIP
MAX774CSA0°C to +70°C8 SO
MAX774C/D0°C to +70°CDice*
MAX774EPA-40°C to +85°C8 Plastic DIP
MAX774ESA-40°C to +85°C8 SO
MAX774MJA-55°C to +125°C8 CERDIP
19-0191; Rev 2; 12/02
EVALUATION KIT
AVAILABLE
Ordering Information continued on last page.
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency,
Low IQInverting DC-to-DC Controllers
ABSOLUTE MAXIMUM RATINGS
Supply Voltages
V+ to OUT...........................................................................21V
V+ to GND..............................................................-0.3V, +17V
OUT to GND........................................................-0.3V, to -17V
REF, SHDN, FB, CS...................................-0.3V to (V+ + 0.3V)
EXT...............................................(VOUT- 0.3V) to (V+ + 0.3V)
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:
MAX77_C__.........................................................0°C to +70°C
MAX77_E__......................................................-40°C to +85°C
MAX77_MJA...................................................-55°C to +125°C
Maximum Junction Temperatures:
MAX77_C__/E__...........................................................+150°C
MAX77_MJA..................................................................+175°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
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.
PARAMETERSYMBOLCONDITIONS
Output Voltage Line Regulation
(Circuit of Figure 2—
Bootstrapped)
MINTYPMAXUNITS
V+ Input Voltage RangeV+3.016.5V
Supply Current
V+ = 16.5V, SHDN ≤0.4V (operating)
MAX774, 4V ≤V+ ≤15V, ILOAD= 0.5A
mV/V
V+ = 10V, SHDN ≥1.6V (shutdown)25
MAX776, 4V ≤V+ ≤6V, ILOAD = 0.1A0.137
V+ = 16.5V, SHDN ≥1.6V (shutdown)4
FB Trip Point3V ≤V+ ≤16.5V-1010mV
FB Input CurrentIFB
MAX77_C
MAX775, 4V ≤V+ ≤8V, ILOAD= 0.2A
±50
MAX77_E±70
MAX775, 0mA ≤ILOAD≤500mA, V+ = 5V1.5
MAX77_M±90
Output Voltage Load Regulation
(Circuit of Figure 2—
Bootstrapped)
Output VoltageVOUT
MAX774-4.80-5-5.20
MAX774, 0A ≤ILOAD≤1A, V+ = 5V1.5
MAX775
mV/A
MAX776, 0mA ≤ILOAD≤400mA, V+ = 5V
MAX776
Reference VoltageVREFIREF= 0µA
MAX77_C1.47001.51.5300MAX77_E1.46251.51.5375
MAX77_M1.45501.51.5450
REF Load Regulation0µA ≤IREF≤100µAMAX77_C/E410mVMAX77_M415
REF Line Regulation3V ≤V+ ≤16.5V40100µV/V
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency
Low IQInverting DC-to-DC Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, ILOAD= 0mA, CREF= 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
3V ≤V+ ≤16.5V
V+ = 16.5V, SHDN = 0V or V+
MAX774, V+ = 5V, ILOAD= 1A
MAX776, V+ = 5V, ILOAD= 400mA
MAX775, V+ = 5V, ILOAD= 500mA
CONDITIONS1.6 VIHSHDN Input Voltage High±1SHDN Input CurrentEfficiency
(Circuit of Figure 2—
Bootstrapped)87
CEXT= 1nF, V+ = 12V
CEXT= 1nF, V+ = 12V50
V+ = 12V
V+ = 12V
EXT Fall Time
1.82.32.8tOFF (max)Switch Minimum Off-Time121620 tON (max)Switch Maximum On-Time±1CS Input Current
UNITSMINTYPMAXSYMBOL
EXT Rise Time
PARAMETER
1602102603V ≤V+ ≤16.5VmV180210240VCSCurrent-Limit Trip Level
(V+ – CS)
0.33V ≤V+ ≤16.5VV0.4VILSHDN Input Voltage Low
MAX77_M
MAX77_C/E
MAX77_M
MAX77_C/E
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency,
Low IQInverting DC-to-DC Controllers
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)101000
MAX774
EFFICIENCY vs. LOAD CURRENT
VOUT = -5V (BOOTSTRAPPED)
MAX1774/5/6-01a
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 5V
VIN = 3V
VIN = 15V100
MAX774
EFFICIENCY vs. LOAD CURRENT
VOUT = -5V (NONBOOTSTRAPPED)
MA774/5/6--1b
LOAD CURRENT (mA)
EFFICIENCY (%)1000VIN = 15V
VIN = 5V
VIN = 4V
MAX774
EFFICIENCY vs. TEMPERATURE
MAX774/5/6-2
TEMPERATURE (°C)
EFFICIENCY (%)06080
ILOAD = 600mA
ILOAD = 1A
ILOAD = 100mA
VIN = 5V
BOOTSTRAPPED100
MAX776
EFFICIENCY vs. LOAD CURRENTVOUT = -15V (BOOTSTRAPPED)
MA774/5/6-1c
LOAD CURRENT (mA)
EFFICIENCY (%)1000
VIN = 4V
VIN = 3V
VIN = 6V
VIN = 5V100
MAX774/MAX775/MAX776
EFFICIENCY vs. LOAD CURRENT
VOUT = -24V (NONBOOTSTRAPPED)
MA774/5/6--1f
LOAD CURRENT (mA)
EFFICIENCY (%)1000
VIN = 4V
VIN = 5V
VIN = 6V100
MAX776
EFFICIENCY vs. LOAD CURRENT
VOUT = -15V (NONBOOTSTRAPPED)
MA774/5/6-1d
LOAD CURRENT (mA)
EFFICIENCY (%)1000VIN = 4V
VIN = 5V
VIN = 15VVIN = 6V100
MAX775
EFFICIENCY vs. OUTPUT CURRENT VOUT = -12V (BOOTSTRAPPED)
MA774/5/6--1
OUTPUT CURRENT (mA)
EFFICIENCY (%)1000
VIN = 4V
VIN = 5V
VIN = 8V100
MAX774/MAX775/MAX776
EFFICIENCY vs. LOAD CURRENT
VOUT = -24V OUTPUT (ZENER CONNECTION)
MA774/5/6--1g
LOAD CURRENT (mA)
EFFICIENCY (%)1000
VIN = 4V
VIN = 5VVIN = 6V41016
MAX774
EFFICIENCY vs. INPUT VOLTAGE
VOUT = -5V AT 100mA
MAX774/5/6-3
INPUT VOLTAGE (V)
EFFICIENCY (%)61214
BOOTSTRAPPED
NONBOOTSTRAPPED
VOUT = -5V AT 100mA
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency
Low IQInverting DC-to-DC Controllers
_____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
SWITCH OFF-TIME vs. TEMPERATURE
MAX761-13
TEMPERATURE (°C)
tOFF
(µs)120
V+ = 5V
STARTUP VOLTAGE
vs. LOAD CURRENT (BOOTSTRAPPED)
MA744/5/6-14
LOAD CURRENT (mA)
START-UP VOLTAGE (V)1000
4.0VOUT = -12V
VOUT = -15V
VOUT = -5V
STARTUP VOLTAGE
vs. LOAD CURRENT (NONBOOTSTRAPPED)
MA744/5/6-15
LOAD CURRENT (mA)
START-UP VOLTAGE (V)1000
4.0VOUT = -24V
VOUT = -15V
VOUT = -12V
VOUT = -5V
MAX774
MAXIMUM LOAD vs. INPUT VOLTAGE
MAX774/5/6-16
INPUT VOLTAGE (V)
LOAD CURRENT (mA)61214
BOOTSTRAPPED
NONBOOTSTRAPPED
VOUT = -5V
EXT RISE AND FALL TIMES
vs. TEMPERATURE
MAX774/5/6-9
TEMPERATURE (°C)
tRISE &
tFALL
(ns)200-2080120100
5V RISE
5V FALL
12V RISE
12V FALL
CEXT = 1nF
EXT RISE AND FALL TIMES
vs. TEMPERATURE
MAX774/5/6-10
TEMPERATURE (°C)
RISE &
FALL
(ns)200-2080120100
5V RISE
5V FALL
12V RISE
12V FALL
CEXT = 5nF
SWITCH ON-TIME vs. TEMPERATURE
MAX761-13
TEMPERATURE (°C)
ton
(µs)120
V+ = 5V
SWITCH ON-TIME/OFF-TIME RATIO
MAX774/5/6-6
TEMPERATURE (°C)
tON
OFF
RATIO (µs/µs)200-2080120100
V+ = 5V4.0
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX774/5/6-7
TEMPERATURE (°C)
ICC
(µA)200-2080120100
V+ = 15V
V+ = 8V
V+ = 4V
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency,
Low IQInverting DC-to-DC Controllers
OPERATING SUPPLY CURRENT
vs. TEMPERATURE
MAX774/5/6-8
TEMPERATURE (°C)
ICC
(µA)200-2080120100
V+ = 16.5V
V+ = 10V
V+ = 3V
REFERENCE
TEMPERATURE COEFFICIENT
MAX774/5/6-12
TEMPERATURE (°C)
REFERENCE OUTPUT (V)200-2080120100
CS TRIP LEVEL
MAX774/5/6-11
TEMPERATURE (°C)
CS TRIP LEVEL (mV)200-2080120100
REFERENCE
OUTPUT RESISTANCE
MAX774/5/6-13
TEMPERATURE (°C)
REFERENCE OUTPUT RESISTANCE (200-2080120100
IREF = 50µA
IREF = 100µA
IREF = 10µA
_____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency
Low IQInverting DC-to-DC Controllers
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
CIRCUIT OF FIGURE 2
V+ = 6.5V, ILOAD = 1A, VOUT = -5V
A: OUTPUT RIPPLE, 200mV/div
B: EXT WAVEFORM, 10V/div
C: INDUCTOR CURRENT, 2A/div
OPERATING WAVEFORMS
10μs/div
CIRCUIT OF FIGURE 2
VOUT = -5V, V+ = 4.7V
ILOAD = 1.05A (1A/div)
INDUCTOR CURRENT NEAR FULL LOAD
20μs/div
1A/div
CIRCUIT OF FIGURE 2
ILOAD = 300mA, VOUT = -5V
V+ = 8V, L = 22μH
CONTINUOUS CONDUCTION
AT ONE-HALF CURRENT LIMIT
20μs/div
1A/div
CIRCUIT OF FIGURE 2
V+ = 6V, ILOAD = 1A, VOUT = -5V
A: SHUTDOWN PULSE, 0V TO V+, 5V/div
B: VOUT, 2V/div
ENTRY/EXIT FROM SHUTDOWN
2ms/div
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency,
Low IQInverting DC-to-DC Controllers
______________________________________________________________Pin Description
PINNAMEFUNCTIONOUTFBSHDNREF1.5V reference output that can source 100µA. Bypass to ground with 0.1µF.V+Positive power-supply inputCSNoninverting input to the current-sense comparator. Typical trip level is 210mV (relative to V+).EXTThe gate-drive output for an external P-channel power MOSFET. EXT swings from OUT to V+.GNDGround
The sense input for fixed-output operation (VFB= VREF). OUT is connected to the internal voltage divider,
and it is the negative supply input for the EXT driver.
Feedback input. When VFB= VREF, the output will be the factory preset value. For adjustable operation,
use an external voltage divider, as described in the Adjustable Output section.
Active-high shutdown input. With SHDN high, the part is in shutdown mode and the supply current is less
than 5µA. Connect to GND for normal operation.
Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
CIRCUIT OF FIGURE 2
V+ = 6V, VOUT = -5V
A: ILOAD, 30mA TO 1A, 1A/div
B: VOUT, 100mV/div, AC-COUPLED
LOAD-TRANSIENT RESPONSE
100μs/div
CIRCUIT OF FIGURE 2
VOUT = -5V, ILOAD = 1A
A: V+, 3V TO 8V, 5V/div
B: VOUT, 100mV/div, AC-COUPLED
LINE-TRANSIENT RESPONSE
2ms/div

Partno	Mfg	Dc	Qty	Available	Descript
MAX774CPA+ \|MAX774CPA	MAXIM	N/a	700	avai	-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
MAX774CSA+ \|MAX774CSA	MAXIM	N/a	95	avai	-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
MAX774ESA+	MAXIM	N/a	2500	avai	-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
MAX774ESA+T \|MAX774ESAT	MAXIM	N/a	2679	avai	-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
MAX775CSA+ \|MAX775CSA	MAXIM	N/a	6	avai	-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
MAX775CSA-T \|MAX775CSAT	MAXIM	N/a	19479	avai	-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers
MAX775ESA+T \|MAX775ESAT	MAXIM	N/a	1000	avai	-5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-to-DC Controllers