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MAX1771ESA+T maxim 美信芯片 电子元器件中文版规格手册.pdf
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MAX1771ESA+T maxim 美信芯片 电子元器件中文版规格手册
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AVAILABLE
EVALUATION KIT AVAILABLE
Functional Diagrams
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and
ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
General Description
The MAX1771 step-up switching controller provides
90% efficiency over a 30mA to 2A load. A unique cur-
rent-limited pulse-frequency-modulation (PFM) control
scheme gives this device 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).
This controller uses miniature external components. Its
high switching frequency (up to 300kHz) allows sur-
face-mount magnetics of 5mm height and 9mm diame-
ter. It accepts input voltages from 2V to 16.5V. The
output voltage is preset at 12V, or can be adjusted
using two resistors.
The MAX1771 optimizes efficiency at low input voltages
and reduces noise by using a single 100mV current-limit
threshold under all load conditions. A family of similar
devices, the MAX770–MAX773, trades some full-load
efficiency for greater current-limit accuracy; they provide
a 200mV current limit at full load, and switch to 100mV
for light loads.
The MAX1771 drives an external N-channel MOSFET
switch, allowing it to power loads up to 24W. If less power
is required, use the MAX756/MAX757 or MAX761/MAX762
step-up switching regulators with on-board MOSFETs. An
evaluation kit is available.
Applications
Positive LCD-Bias Generators
Flash Memory Programmers
High-Power RF Power-Amplifier Supply
Palmtops/Hand-Held Terminals
Battery-Powered Applications
Portable Communicators
Features
♦ 90% Efficiency for 30mA to 2A Load Currents
♦ Up to 24W Output Power
♦ 110µA (max) Supply Current
♦ 5µA (max) Shutdown Current
♦ 2V to 16.5V Input Range
♦ Preset 12V or Adjustable Output Voltage
♦ Current-Limited PFM Control Scheme
♦ Up to 300kHz Switching Frequency
♦ Evaluation Kit Available
Ordering Information
12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
1
2
3
4
8
7
6
5
CS
GND
AGND
REF
SHDN
FB
V+
EXT
TOP VIEW
MAX1771
DIP/SO
Pin Configuration
FB AGND GND
V+
CS
EXT
N
REF
SHDN
ON/OFF
OUTPUT
12V
INPUT
2V TO V
OUT
MAX1771
Typical Operating Circuit
PART TEMP RANGE PIN-PACKAGE
MAX1771CPA 0°C to +70°C 8 Plastic DIP
MAX1771CSA 0°C to +70°C 8 SO
MAX1771C/D 0°C to +70°C Dice*
MAX1771EPA -40°C to +85°C 8 Plastic DIP
MAX1771ESA -40°C to +85°C 8 SO
MAX1771MJA -55°C to +125°C 8 CERDIP**
19-0263; Rev 2; 3/02
* Contact factory for dice specifications.
** Contact factory for availability and processing to MIL-STD-883B.
MAX1771
12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
V+ to GND ...............................................................-0.3V, 17V
EXT, CS, REF, SHDN, FB to GND ...................-0.3V, (V+ + 0.3V)
GND to AGND.............................................................0.1V, -0.1V
Continuous Power Dissipation (T
A
= +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
MAX1771C_A .....................................................0°C to +70°C
MAX1771E_A ..................................................-40°C to +85°C
MAX1771MJA ................................................-55°C to +125°C
Junction Temperatures
MAX1771C_A/E_A.......................................................+150°C
MAX1771MJA ..............................................................+175°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°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.
ELECTRICAL CHARACTERISTICS
(V+ = 5V, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current 85 110 µA
Standby Current
25
µA
4
Output Voltage (Note 1) V
V+ = 2V to 12V, over full load range,
Circuit of Figure 2a
11.52 12.0 12.48
V+ = 5V to 7V, V
OUT
= 12V
I
LOAD
= 700mA, Circuit of Figure 2a
5 mV/V
V+ = 6V, V
OUT
= 12V, I
LOAD
= 0mA to
500mA, Circuit of Figure 2a
20 mV/A
Maximum Switch On-Time t
ON
(max) 12 16 20 µs
Minimum Switch Off-Time t
OFF
(min) 1.8 2.3 2.8 µs
%
Reference Voltage V
REF
I
REF =
0µA
MAX1771C 1.4700 1.5 1.5300
V
MAX1771E 1.4625 1.5 1.5375
MAX1771M 1.4550 1.5 1.5450
Output Voltage Line Regulation
(Note 2)
Output Voltage Load Regulation
(Note 2)
V+ = 5V, V
OUT
= 12V, I
LOAD
= 500mA,
Circuit of Figure 2a
V+ = 10V, SHDN ≥ 1.6V (shutdown)
V+ = 16.5V, SHDN ≥ 1.6V (shutdown)
V+ = 16.5V, SHDN = 0V (normal operation)
Minimum Start-Up Voltage 1.8 2.0 V
MAX1771 (internal feedback resistors) 2.0 12.5
MAX1771C/E (external resistors) 3.0 16.5
MAX1771MJA (external resistors) 3.1 16.5
Input Voltage Range V
Efficiency 92
REF Load Regulation 0µA ≤ I
REF
≤ 100µA
MAX1771C/E 410
mV
MAX1771M 415
3V ≤ V+ ≤ 16.5V 40 100
FB Trip Point Voltage V
FB
MAX1771C 1.4700 1.5 1.5300
V
MAX1771E 1.4625 1.5 1.5375
MAX1771M 1.4550 1.5 1.5450
µV/VREF Line Regulation
MAX1771
2
Maxim Integrated
12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, I
LOAD
= 0mA, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETERS
SYMBOL CONDITIONS MIN TYP MAX UNITS
FB Input Current I
FB
MAX1771C ±20
nAMAX1771E ±40
MAX1771M ±60
SHDN Input High Voltage V
IH
V+ = 2V to 16.5V 1.6 V
SHDN Input Low Voltage V
IL
V+ = 2V to 16.5V 0.4 V
SHDN Input Current ±1 µAV+ = 16.5V, SHDN = 0V or V+
Current-Limit Trip Level V
CS
V+ = 5V to 16V
85 100 115
mV
CS Input Current 0.01 ±1 µA
EXT Rise Time V+ = 5V, 1nF from EXT to ground 55 ns
EXT Fall Time V+ = 5V, 1nF from EXT to ground 55 ns
Note 1: Output voltage guaranteed using preset voltages. See Figures 4a–4d for output current capability versus input voltage.
Note 2: Output voltage line and load regulation depend on external circuit components.
75 100 125
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
60
65
75
70
80
85
90
95
100
1
10
100
10,000
1000
EFFICIENCY vs. LOAD CURRENT
(BOOTSTRAPED MODE)
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5V
V
IN
= 3V
V
IN
= 8V
V
IN
= 10V
V
OUT
= 12V
CIRCUIT OF
FIGURE 2a
MAX1771–01
60
65
75
70
80
85
90
95
100
1
10
100
10,000
1000
EFFICIENCY vs. LOAD CURRENT
(NON-BOOTSTRAPED MODE)
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 5V
V
IN
=10V
V
IN
= 8V
V
OUT
= 12V
CIRCUIT OF
FIGURE 2b
MAX1771–02
0
2.00
LOAD CURRENT vs.
MINIMUM START-UP INPUT VOLTAGE
MAX1771-TOC3
MINIMUM START-UP INPUT VOLTAGE (V)
LOAD CURRENT (mA)
100
200
300
400
500
600
700
2.25 2.50 2.75 3.00 3.25 3.50
EXTERNAL FET THRESHOLD
LIMITS FULL-LOAD START-UP
BELOW 3.5V
V
OUT
= 12V, CIRCUIT OF FIGURE 2a
MAX1771C/E
MAX1771M
MAX1771
Maxim Integrated
3
250
0
-60 -20 60 140
REFERENCE OUTPUT RESISTANCE vs.
TEMPERATURE
50
MAX1771-07
TEMPERATURE (°C)
REFERENCE OUTPUT RESISTANCE (Ω)
20 100
150
-40 0 8040 120
100
200
100µA
50µA
10µA
1.502
-60 -20 60 140
REFERENCE vs. TEMPERATURE
MAX1771-08
TEMPERATURE (°C)
REFERENCE (V)
20 100-40 0 8040 120
1.500
1.498
1.496
1.494
1.492
1.504
1.506
15.5
16.0
16.5
-60
-30 0 30 60
90
120 150
MAXIMUM SWITCH ON-TIME vs.
TEMPERATURE
TEMPERATURE (°C)
t
ON(MAX) (µs)
MAX1771-09
12V or Adjustable, High-Efficiency,
Low I
Q
, Step-Up DC-DC Controller
4.0
-60 -20 60 140
SHUTDOWN CURRENT vs. TEMPERATURE
MAX1771-10
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
20 100-40 0 8040 120
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V+ = 15V
V+ = 4V
V+ = 8V
2.20
2.25
2.30
-60
-30 0 30 60
90
120 150
MINIMUM SWITCH OFF-TIME vs.
TEMPERATURE
TEMPERATURE (°C)
t
OFF(MIN) (µs)
MAX1771-11
6.0
7.0
8.0
-60
-30 0 30 60
90
120 150
MAXIMUM SWITCH ON-TIME/
MINIMUM SWITCH OFF-TIME RATIO
vs. TEMPERATURE
TEMPERATURE (°C)
t
ON(MAX)/
t
OFF(MIN) RATIO
MAX1771-12
7.5
6.5
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
0
1
2
3
4
-75
-50 -25 0
25 50 75 100 125
SUPPLY CURRENT vs. TEMPERATURE
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
V
OUT
= 12V, V
IN
= 5V
CIRCUIT OF FIGURE 2a
BOOTSTRAPPED MODE
ENTIRE
CIRCUIT
SCHOTTKY DIODE
LEAKAGE EXCLUDED
MAX1771-04
0
0.2
0.4
0.6
0.8
2
4
68
10
12
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
V
OUT
= 12V
NON-BOOTSTRAPPED
CIRCUIT OF FIGURE 2b
BOOTSTRAPPED
CIRCUIT OF
FIGURE 2a
MAX1771-05
0
100
150
200
250
50
2
4
68
10
12
EXT RISE/FALL TIME vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
EXT RISE/FALL TIME (ns)
C
EXT
= 2200pF
C
EXT
= 1000pF
C
EXT
= 446pF
C
EXT
= 100pF
MAX1771-06
MAX1771
4
Maxim Integrated
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