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MAX774CPA View Datasheet(PDF) - Maxim Integrated

Part NameMAX774CPA MaximIC
Maxim Integrated MaximIC
Description-15V or adjustable, high-efficiency, low IQ inverting DC-DC controller
MAX774CPA Datasheet PDF : 16 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
19-0191; Rev 1; 3/94
EVAALVUAAILTAIOBNLEKIT
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low IQ Inverting DC-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 sup-
ply 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 - VOUT differential voltage is limited only by the break-
down voltage of the chosen external switch transistor.
These inverters use external P-channel MOSFET switch-
es, 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-DC Converters
Battery-Powered Applications
Data Communicators
____________________________Features
o 85% Efficiency for 5mA to 1A Load Currents
o Up to 5W Output Power
o 100µA Max Supply Current
o 5µA Max Shutdown Current
o 3V to 16.5V Input Range
o -5V (MAX774), -12V (MAX775), -15V (MAX776),
or Adjustable Output Voltage
o Current-Limited PFM Control Scheme
o 300kHz Switching Frequency
______________Ordering Information
PART
MAX774CPA
MAX774CSA
MAX774C/D
MAX774EPA
MAX774ESA
MAX774MJA
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
Ordering Information continued on last page.
* Contact factory for dice specifications.
__________Typical Operating Circuit
INPUT
3V TO 16V
V+
ON/OFF
MAX774 CS
SHDN
EXT
P
FB
REF
OUT
GND
OUTPUT
-5V
__________________Pin Configuration
TOP VIEW
OUT 1
FB 2
SHDN 3
REF 4
MAX774
MAX775
MAX776
DIP/SO
8 GND
7 EXT
6 CS
5 V+
________________________________________________________________ Maxim Integrated Products 1
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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.

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