MAX773CPD+ Maxim Integrated Products, MAX773CPD+ Datasheet

IC CNTRLR DC-DC 14-DIP

MAX773CPD+

Manufacturer Part Number
MAX773CPD+
Description
IC CNTRLR DC-DC 14-DIP
Manufacturer
Maxim Integrated Products
Type
Step-Up (Boost)r
Datasheet
1.MAX770CSA.pdf (20 pages)

Specifications of MAX773CPD+

Internal Switch(s)
No
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
5V, 12V, 15V, Adj
Current - Output
1A
Frequency - Switching
300kHz
Voltage - Input
3 ~ 16.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Through Hole
Package / Case
14-DIP (0.300", 7.62mm)
Power - Output
727mW
Output Voltage
5 V to 12 V
Output Current
1 A
Input Voltage
2 V to 16.5 V
Supply Current
110 uA
Switching Frequency
300 KHz
Mounting Style
Through Hole
Maximum Operating Temperature
+ 70 C
Minimum Operating Temperature
0 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-0202; Rev 2; 11/96
The MAX770–MAX773 step-up switching controllers pro-
vide 90% efficiency over a 10mA to 1A load. A
unique current-limited pulse-frequency-modulation (PFM)
control scheme gives these devices the benefits of
pulse-width-modulation (PWM) converters (high efficiency
at heavy loads), while using less than 110µA of supply
current (vs. 2mA to 10mA for PWM converters).
These ICs use tiny external components. Their high
switching frequencies (up to 300kHz) allow surface-
mount magnetics of 5mm height and 9mm diameter.
The MAX770/MAX771/MAX772 accept input voltages
from 2V to 16.5V. Output voltages are preset at 5V,
(MAX770), 12V (MAX771), and 15V (MAX772); they can
also be adjusted using two resistors.
The MAX773 accepts inputs from 3V to 16.5V. For a wider
input range, it features an internal shunt regulator that
allows unlimited higher input voltages. The MAX773’s out-
put can be set to 5V, 12V, or 15V, or it can be adjusted
with two resistors.
The MAX770–MAX773 drive external N-channel MOSFET
switches, allowing them to power loads up to 15W. If less
power is required, use the MAX756/MAX757 or
MAX761/MAX762 step-up switching regulators with on-
board MOSFETs.
________________________Applications
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
__________Typical Operating Circuit
_______________General Description
2V TO V OUT
INPUT
ON/OFF
Palmtops/Handy-Terminals
High-Efficiency DC-DC Converters
Battery-Powered Applications
Positive LCD-Bias Generators
Portable Communicators
Flash Memory Programmers
SHDN
REF
5V/12V/15V or Adjustable, High-Efficiency,
________________________________________________________________ Maxim Integrated Products
FB AGND GND
MAX771
EXT
CS
V+
N
Low I
OUTPUT
12V
Q
, Step-Up DC-DC Controllers
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883B.
____________________________Features
_________________Pin Configurations
______________Ordering Information
MAX770CPA
MAX770CSA
MAX770C/D
MAX770EPA
MAX770ESA
MAX770MJA
Pin Configurations continued at end of data sheet.
TOP VIEW
90% Efficiency for 10mA to 1A Load Currents
Up to 15W Output Power
110µA Max Supply Current
5µA Max Shutdown Current
2V to 16.5V Input Range
(MAX770/MAX771/MAX772)
Internal Shunt Regulator for High Input Voltages
(MAX773)
Preset or Adjustable Output Voltages
Current-Limited PFM Control Scheme
300kHz Switching Frequency
PART
MAX770: 5V or Adjustable
MAX771: 12V or Adjustable
MAX772: 15V or Adjustable
MAX773: 5V, 12V, 15V, or Adjustable
SHDN
EXT
V+
FB
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
1
2
3
4
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
MAX770
MAX771
MAX772
DIP/SO
8
7
6
5
CS
GND
AGND
REF
PIN-PACKAGE
Plastic DIP
8 SO
Dice*
8 Plastic DIP
8 SO
8 CERDIP**
1

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MAX773CPD+ Summary of contents

Page 1

... EXT MAX771 ON/OFF SHDN CS REF V+ FB AGND GND ________________________________________________________________ Maxim Integrated Products For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. Low I , Step-Up DC-DC Controllers Q ____________________________Features 90% Efficiency for 10mA to 1A Load Currents Up to 15W Output Power 110µ ...

Page 2

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q ABSOLUTE MAXIMUM RATINGS Supply Voltages V+ to GND.............................................................-0.3V to 17V V+ to SGND.............................................................-0. SGND........................................................-0.3V to (V+ + 0.3V) EXT, CS, REF, LBO, LBI, SHDN, FB.............-0.3V to (V+ ...

Page 3

Adjustable, High-Efficiency, ELECTRICAL CHARACTERISTICS (continued) ( 0mA LOAD A MIN PARAMETERS SYMBOL REF Load Regulation REF Line Regulation FB Trip-Point Voltage V FB Input Current I SHDN Input High ...

Page 4

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q __________________________________________Typical Operating Characteristics (T = +25°C, unless otherwise noted.) A MAX770 EFFICIENCY vs. OUTPUT CURRENT (BOOTSTRAPPED) 100 3. ...

Page 5

Adjustable, High-Efficiency, ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A REFERENCE OUTPUT RESISTANCE vs. TEMPERATURE 250 200 150 100 50 0 -60 -40 - TEMPERATURE ( C) MAXIMUM SWITCH ON-TIME vs. TEMPERATURE 16.5 ...

Page 6

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q ____________________________Typical Operating Characteristics (continued) (Circuit of Figure 2a +25°C, unless otherwise noted.) A MAX770 HEAVY-LOAD SWITCHNG WAVEFORMS V OUT 0 I LIM I LIM ...

Page 7

Adjustable, High-Efficiency, ____________________________Typical Operating Characteristics (continued) (Circuit of Figure 2a +25°C, unless otherwise noted.) A ______________________________________________________________Pin Description PIN MAX770 NAME MAX771 MAX773 MAX772 1 — EXT Gate drive for external N-channel power transistor Power-supply input. Also ...

Page 8

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q _________________________________________________Pin Description (continued) PIN MAX770 NAME MAX771 MAX773 MAX772 Low-level gate/base drive for external power transistor. Connect to the gate of an external — 12 EXTL N-channel MOSFET or ...

Page 9

Adjustable, High-Efficiency, LBO V15 V12 V+ MAX773 ONLY LBI N 1.5V REF REFERENCE COMPARATOR ONE-SHOT Q TRIG F ONE-SHOT TRIG Q Figure 1. Block Diagram Floating the shunt-regulator ground (SGND) disables the shunt regulator. To ...

Page 10

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers 0 REF C3 L1 0.1 F MAX770 SHDN EXT MTP3055EL 8 6 AGND ...

Page 11

Adjustable, High-Efficiency V12 14 V15 SGND R4 8 63.4k REF MAX773 (1 LBO 0 LBI 13 EXTH EXTL SHDN 10k ...

Page 12

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers 24V TO 28V 250 H R SHUNT 0 SGND N EXTH 13 Si9420DY 4 LBO 12 ...

Page 13

Adjustable, High-Efficiency, drive outputs (EXTH and EXTL) that operate 180° out of phase (Figures 3a and 3b). In Figure 3b, the resistor in series with EXTH limits the base current, and EXTL (which is connected directly to the ...

Page 14

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q Table 1. Bootstrapped vs. Non-Bootstrapped Operation PARAMETER Gate Drive FET On Resistance Gate-Drive Capacitive Losses No-Load Supply Current Possible Input Voltage Range Normally Recommended Input Voltage Range Fixed Output ...

Page 15

Adjustable, High-Efficiency, 3 OUT 3 40m SENSE 2 50m SENSE 2.0 R SENSE 1.5 1.0 R SENSE 0.5 R SENSE INPUT VOLTAGE (V) Figure ...

Page 16

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q MAX770 MAX771 MAX772 EXT CS Figure 8a. Use an N-Channel MOSFET with the MAX770/MAX771/MAX772 MAX773 EXTH EXTL CS Figure 8b. Using an N-Channel MOSFET with the MAX773 The standard ...

Page 17

Adjustable, High-Efficiency, The two most significant losses contributing to the 2 N-FET’s power dissipation are I R losses and switching losses. Select a transistor with low minimize these losses. RSS Determine the maximum required gate-drive ...

Page 18

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q Smaller capacitors are acceptable for light loads or in applications that can tolerate higher output ripple. Since the output filter capacitor’s ESR affects efficien- cy, use low-ESR capacitors for ...

Page 19

Adjustable, High-Efficiency, Starting Up under Load The Typical Operating Characteristics show the Start- Up Voltage vs. Load Current graph for bootstrapped- mode operation. This graph depends on the type of power switch used. The MAX770–MAX773 are not designed ...

Page 20

Adjustable, High-Efficiency, Low I , Step-Up DC-DC Controllers Q ___Ordering Information (continued) PART TEMP. RANGE MAX771CPA 0°C to +70°C MAX771CSA 0°C to +70°C MAX771C/D 0°C to +70°C MAX771EPA -40°C to +85°C MAX771ESA -40°C to +85°C MAX771MJA -55°C to ...

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