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MAX1626ESA maxim 美信芯片 电子元器件中文版规格手册.pdf
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MAX1626ESA maxim 美信芯片 电子元器件中文版规格手册
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MAX1626/MAX1627
5V/3.3V or Adjustable,
100% Duty-Cycle, High-Efficiency,
Step-Down DC-DC Controllers
EVALUATION KIT AVAILABLE
General Description
The MAX1626/MAX1627 step-down DC-DC controllers
operate over a 2.6V to 16.5V input voltage range. The
controllers deliver load current from 1mA to more than
2A. The MAX1626 has pin-selectable 3.3V and 5V out-
puts. The MAX1627 supports adjustable outputs from
1.3V to 16V.
A unique current-limited, pulse-frequency-modulation
(PFM) control scheme operates up to 100% duty cycle,
resulting in very low dropout voltage. This control
scheme eliminates minimum load requirements and
reduces supply current under light loads to 90µA
(versus 2mA to 10mA for common pulse-width modula-
tion controllers).
The devices are available in a 8-pin SOIC package
(-40°C to +85°C) and dice (0°C to +70°C).
Applications
• 5V to 3.3V Green PC Applications
• Battery-Powered Applications
• Handheld Computers
• High-Efficiency Step-Down Regulation
• Low-Cost Notebook Computer Supplies
• Minimum Component DC-DC Converters
• PCMCIA Power Supplies
• PDAs and Other Handheld Devices
• Portable Terminals
Benefits and Features
• Reduce External Components and Total Cost
• 300KHz PWM Switching Reduces Component Size
• Tiny Surface-Mount Inductor
• Reduce Power Dissipation
• > 90% Efficiency from 3mA to 2A Loads
• Low Dropout Voltage
• 100% Maximum Duty Cycle
• Reduce Number of DC-DC Controllers to Stock
• Wide 2.6V to 16.5V Input Voltage Options
• Selectable 3.3V and 5V or Adjustable 1.3V to 16V
Output Voltage Options
• Reduce System Power Consumption
• 90µA Max Quiescent Current
• 1µA Max Shutdown Current
• Operates Reliably in Adverse Environment
• Soft-Start Limits Startup Current
• Current-Limited Control Scheme
• Increase Design Flexibility
• External P-Channel MOSFET Allows Output Power
of > 12.5W
MAX1626
V+
CSSHDN
GND
3/5
ON/OFF
P
EXT
REF
OUT
OUTPUT
3.3V
INPUT
3.3V to 16.5V
Pin Configuration
1
2
3
4
8
7
6
5
GND
EXT
CS
V+
REF
SHDN
3/5 (FB)
OUT
( ) ARE FOR MAX1627
SO
TOP VIEW
MAX1626
MAX1627
Typical Operating Circuit
PART
MAX1626C/D
MAX1626ESA
MAX1627C/D
0°C to +70°C
-40°C to +85°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
Dice*
8 SO
Dice*
Ordering Information
* Dice are tested at T
A
= +25°C.
MAX1627ESA -40°C to +85°C 8 SO
19-1075; Rev 1; 5/15
MAX1626/MAX1627
5V/3.3V or Adjustable,
100% Duty-Cycle, High-Efficiency,
Step-Down DC-DC Controllers
Maxim Integrated | 2www.maximintegrated.com
Electrical Characteristics
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.
Supply Voltage, V+ to GND.......................................-0.3V, +17V
OUT, FB, 3/5, SHDN, REF, CS, EXT to GND ...-0.3V, (V+ + 0.3V)
Maximum Current at REF (I
REF
)..........................................15mA
Maximum Current at EXT (I
EXT
) ..........................................50mA
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.88mW/°C above +70°C)..........................471mW
Operating Temperature Range
MAX1626ESA/MAX1627ESA ............................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
0µA ≤ I
REF
≤ 100µA
I
LOAD
= 0µA
30mA < I
LOAD
< 2.0A, V+ = 8V
V+ = SHDN = 16.5V (shutdown)
6.0V < V+ < 12.0V, I
LOAD
= 1A
Operating, no load
Output in regulation
Output forced to 0V
V+ = 5V
3/5 = 0V or V+
MAX1627
Circuit of Figure 1, 3/5 = V+ (Note 1)
MAX1626, 3/5 = V+, output forced to 5V
SHDN = 0V or V+
MAX1627, includes hysteresis
CONDITIONS
mV410REF Load Regulation
V1.27 1.30 1.33V
REF
Reference Voltage
mV/A15Load Regulation
mV/V5Line Regulation
%100EXT Duty-Cycle Limit
µs
1.5 2.0 2.5
81012
Minimum EXT Off Time
Ω10EXT Resistance
µA±1
3/5 Leakage Current
V0.5
3/5 Input Voltage Low
VV+ - 0.5
3/5 Input Voltage High
µA±1SHDN Input Current
V0.4SHDN Input Voltage Low
µA
1
I+Supply Current into V+
70 90
V3.0 16.5V+Input Voltage Range
V1.6SHDN Input Voltage High
mV85 100 115V
CS
CS Threshold Voltage
µA010CS Input Current
nA035FB Leakage Current
V2.7 2.8Undervoltage Lockout
4.85 5.00 5.15
µA24 37 50I
OUT
OUT Input Current
V1.27 1.30 1.33FB Threshold Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
V+ = 3V to 16.5V, I
LOAD
= 0µA µV/V10 100REF Line Regulation
Circuit of Figure 1, 3/5 = 0V (Note 1)
V
3.20 3.30 3.40
V
OUT
Output Voltage
MAX1626/MAX1627
5V/3.3V or Adjustable,
100% Duty-Cycle, High-Efficiency,
Step-Down DC-DC Controllers
Maxim Integrated | 3www.maximintegrated.com
Electrical Characteristics
Note 1: V+ must exceed V
OUT
to maintain regulation.
Note 2: Specifications from 0°C to -40°C are guaranteed by design, not production tested.
V+ = SHDN = 16.5V (shutdown)
Operating, no load
I
LOAD
= 0µA
MAX1627
Circuit of Figure 1, 3/5 = V+
MAX1626, 3/5 = V+, output forced to 5V
MAX1627, includes hysteresis
CONDITIONS
µA
2
I
OUT
Supply Current into V+
100
V3.0 16.5V+Input Voltage
V1.25 1.35Reference
mV80 120CS Threshold Voltage
nA050FB Leakage Current
V2.9Undervoltage Lockout
4.80 5.20
µA24 50I
OUT
OUT Input Current
V1.25 1.35FB Threshold Voltage
UNITSMIN TYP MAXSYMBOLPARAMETER
Circuit of Figure 1, 3/5 = 0V
V
3.16 3.44
V
OUT
Output Voltage
100
0
0.1m 100m 11m 10m 10
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +3.3V)
20
10
MAX1626-05
LOAD CURRENT (A)
EFFICIENCY (%)
40
30
60
50
70
80
90
A: V+ = +4.3V
B: V+ = +5V
C: V+ = +8V
D: V+ = +10V
E: V+ = +12V
F: V+ = +15V
CIRCUIT OF FIGURE 1
A
B
C
D E F
100
0
0.1m 100m 11m 10m 10
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= +5V)
20
10
MAX1626-03
LOAD CURRENT (A)
EFFICIENCY (%)
40
30
60
50
70
80
90
A: V+ = +6V
B: V+ = +8V
C: V+ = +10V
D: V+ = +12V
E: V+ = +15V
CIRCUIT OF FIGURE 1
A
B
C
D
E
0.45
0
0 0.5 1.0 1.5 2.0 2.5
DROPOUT VOLTAGE
vs. LOAD CURRENT
0.05
0.10
0.35
0.25
0.30
0.40
MAX1626-11
LOAD (A)
DROPOUT VOLTAGE (V)
0.20
0.15
3.3V SETTING
V
OUT
= +3.17V
5V SETTING
V
OUT
= +4.8V
Typical Operating Characteristics
MAX1626/MAX1627
5V/3.3V or Adjustable,
100% Duty-Cycle, High-Efficiency,
Step-Down DC-DC Controllers
Maxim Integrated | 4www.maximintegrated.com
0
-60
-40
MAX1626 SHUTDOWN CURRENT
vs. TEMPERATURE
MAX1626-04
TEMPERATURE (°C)
SHUTDOWN CURRENT (μA)
0.1
0.3
0.2
0.5
0.4
0.6
0.7
0.8
-20 0 20
40
60 80 100 120
140
E
C
B
A
D
APPLICATION CIRCUIT
SHUTDOWN CURRENT:
A: V+ = +15V
B: V+ = +10V
C: V+ = +4V
MAX1626 SHUTDOWN
CURRENT:
D: V+ = +16V
E: V+ = +4V
400
0
0 2000 4000
EXT RISE AND FALL TIMES
vs. CAPACITANCE
50
100
300
250
350
MAX1626-10
CAPACITANCE (pF)
t
RISE
AND t
FALL
(ns)
200
150
t
RISE
, V+ = +15V
t
FALL
, V+ = +5V
t
RISE
, V+ = +5V
t
FALL
, V+ = +15V
50
0
-60 -40 -20 40 60 140
EXT RISE AND FALL TIMES
vs. TEMPERATURE
10
5
15
40
35
45
MAX1626-09
TEMPERATURE (°C)
t
RISE
AND t
FALL
(ns)
0
20 80
25
20
30
100 120
t
FALL
, V+ = +5V
C
EXT
= 1nF
3/5 = 0V
OUT = 50kHz, 0.3Vp-p
,
3.3V
DC
t
RISE
, V+ = +5V
t
RISE
, t
FALL
, V+ = +15V
60
-60
-40
MAX1626
V+ QUIESCENT CURRENT
vs. TEMPERATURE
MAX1626-01
TEMPERATURE (°C)
I
Q
(μA)
62
64
66
68
70
72
-20 0 20
40
60 80 100 120
140
3/5 = 0V
OUT FORCED TO 3.4V
V+ = +16V
V+ = +10V
V+ = +4V
12
0
012345
MAX1626 EXT OFF TIME
vs. OUTPUT VOLTAGE
2
8
10
MAX1626-02
OUTPUT VOLTAGE (V)
EXT OFF TIME (μs)
6
4
V+ = +5V
3/5 = GND
3/5 = V+
12
0
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
MAX1627 EXT OFF TIME
vs. FB PIN VOLTAGE
2
8
10
MAX1626-03
FB PIN VOLTAGE (V)
EXT OFF TIME (μs)
6
4
V+ = +5V
115
85
-60 -40 -20 0 20 40 60 80 100 120 140
CS TRIP LEVEL vs. TEMPERATURE
90
105
110
MAX1626-12
TEMPERATURE (°C)
CS TRIP LEVEL (mV)
100
95
OUT = 0V
Typical Operating Characteristics (continued)
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