MAX776CSA+ Maxim Integrated Products, MAX776CSA+ Datasheet

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MAX776CSA+

Manufacturer Part Number
MAX776CSA+
Description
DC DC Cntrlr Single-OUT Inverting 3V to 16.5V Input 8-Pin SOIC N
Manufacturer
Maxim Integrated Products
Type
Invertingr
Datasheet
1.MAX774CSA.pdf (16 pages)

Specifications of MAX776CSA+

Package
8SOIC N
Input Voltage
3 to 16.5 V
Output Voltage
-15 V
Output Current
0.4 A
Number Of Outputs
1
Mounting Style
SMD/SMT
Package / Case
SOIC-8 Narrow
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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
V
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.
19-0191; Rev 2; 12/02
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
IN
ON/OFF
- V
3V TO 16V
INPUT
OUT
LCD-Bias Generators
High-Efficiency DC-to-DC Converters
Battery-Powered Applications
Data Communicators
differential voltage is limited only by the break-
REF
SHDN
FB
Typical Operating Circuit
MAX774
-5V/-12V/-15V or Adjustable, High-Efficiency,
________________________________________________________________ Maxim Integrated Products
GND
General Description
OUT
EXT
CS
V+
Low I
P
Applications
Q
OUTPUT
-5V
Inverting DC-to-DC Controllers
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),
o Current-Limited PFM Control Scheme
o 300kHz Switching Frequency
*Contact factory for dice specifications.
Ordering Information continued on last page.
MAX774CPA
MAX774CSA
MAX774C/D
MAX774EPA
MAX774ESA
MAX774MJA
or Adjustable Output Voltage
TOP VIEW
PART
SHDN
OUT
REF
FB
1
2
3
4
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
Ordering Information
MAX774
MAX775
MAX776
DIP/SO
Pin Configuration
8
5
7
6
PIN-PACKAGE
GND
EXT
CS
V+
8 Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP
Features
1

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MAX776CSA+ Summary of contents

Page 1

... SHDN ON/OFF EXT FB REF OUT GND ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Inverting DC-to-DC Controllers Q o 85% Efficiency for 5mA to 1A Load Currents Output Power o 100µA (max) Supply Current o 5µ ...

Page 2

Adjustable, High-Efficiency, Low I Inverting DC-to-DC Controllers Q 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 ...............................................(V ...

Page 3

Adjustable, High-Efficiency, Low I ELECTRICAL CHARACTERISTICS (continued) ( 0mA 0.1µF, T LOAD REF PARAMETER SYMBOL Efficiency (Circuit of Figure 2— Bootstrapped) SHDN Input Current SHDN Input Voltage High V SHDN Input Voltage ...

Page 4

Adjustable, High-Efficiency, Low I Inverting DC-to-DC Controllers Q __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A MAX774 EFFICIENCY vs. LOAD CURRENT V = -5V (BOOTSTRAPPED) OUT ...

Page 5

Adjustable, High-Efficiency, Low I _____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A STARTUP VOLTAGE vs. LOAD CURRENT (BOOTSTRAPPED) 5 -15V OUT 4 -12V OUT 4.0 3 -5V OUT 3.0 ...

Page 6

Adjustable, High-Efficiency, Low I Inverting DC-to-DC Controllers Q _____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A OPERATING SUPPLY CURRENT vs. TEMPERATURE 16. 10V ...

Page 7

Adjustable, High-Efficiency, Low I __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A OPERATING WAVEFORMS 10 s/div CIRCUIT OF FIGURE 6.5V 1A -5V LOAD OUT A: OUTPUT RIPPLE, 200mV/div B: ...

Page 8

Adjustable, High-Efficiency, Low I Inverting DC-to-DC Controllers +25°C, unless otherwise noted.) A LOAD-TRANSIENT RESPONSE 100 s/div CIRCUIT OF FIGURE 6V -5V OUT 30mA TO 1A, 1A/div LOAD ...

Page 9

Adjustable, High-Efficiency, Low I REF SHDN Q ONE-SHOT TRIG Q ONE-SHOT Figure 1. Functional Diagram Detailed Description The MAX774/MAX775/MAX776 are negative-output, inverting power controllers that can be configured to drive an external P-channel MOSFET. The output voltages are ...

Page 10

Adjustable, High-Efficiency, Low I Inverting DC-to-DC Controllers OUT 150 F 0.1 F MAX774 3 6 MAX775 SHDN CS MAX776 EXT 4 REF GND C3 8 0.1 F ...

Page 11

Adjustable, High-Efficiency, Low I 0 OUT GND R2 MAX774 2 MAX775 FB MAX776 R1 4 REF 0 10V Z IN VOUT – > ...

Page 12

Adjustable, High-Efficiency, Low I Inverting DC-to-DC Controllers Q 2500 R = 0.05 SENSE R = 0.06 2000 SENSE 1500 1000 R SENSE R SENSE 500 R = 0.09 SENSE V = -5V OUT ...

Page 13

Adjustable, High-Efficiency, Low I 700 R = 0.05 SENSE 600 R = 0.06 SENSE R = 0.07 SENSE 500 400 300 200 R SENSE R = 0.09 SENSE 100 INPUT VOLTAGE (V) Figure 8. MAX776 ...

Page 14

Adjustable, High-Efficiency, Low I Inverting DC-to-DC Controllers Q Table 1. Component Suppliers SUPPLIER PHONE INDUCTORS Coiltronics (407) 241-7876 Gowanda (716) 532-2234 Sumida Japan 81-3-3607-5111 Sumida USA (708) 956-0666 CAPACITORS Kemet (803) 963-6300 Matsuo (714) 969-2491 Nichicon (708) 843-7500 ...

Page 15

Adjustable, High-Efficiency, Low I Ordering Information (continued) PART TEMP RANGE MAX775CPA 0°C to +70°C MAX775CSA 0°C to +70°C MAX775C/D 0°C to +70°C MAX775EPA -40°C to +85°C MAX775ESA -40°C to +85°C MAX775MJA -55°C to +125°C MAX776CPA 0°C to +70°C ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2002 Maxim Integrated Products ...

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