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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1627 Datasheet

Step-Down DC-DC Controllers

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MAX1626/MAX1627
EVALUATION KIT AVAILABLE
5V/3.3V or Adjustable,
100% Duty-Cycle, High-Efficiency,
Step-Down DC-DC Controllers
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
Pin Configuration
TOP VIEW
OUT 1
3/5 (FB) 2
SHDN 3
REF 4
MAX1626
MAX1627
8 GND
7 EXT
6 CS
5 V+
( ) ARE FOR MAX1627
SO
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
Ordering Information
PART
TEMP RANGE
MAX1626C/D
0°C to +70°C
MAX1626ESA
-40°C to +85°C
MAX1627C/D
0°C to +70°C
MAX1627ESA
-40°C to +85°C
* Dice are tested at TA = +25°C.
PIN-PACKAGE
Dice*
8 SO
Dice*
8 SO
Typical Operating Circuit
INPUT
3.3V to 16.5V
ON/OFF
V+
MAX1626
SHDN
CS
EXT
3/5
REF OUT
GND
P
OUTPUT
3.3V
19-1075; Rev 1; 5/15


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1627 Datasheet

Step-Down DC-DC Controllers

No Preview Available !

MAX1626/MAX1627
5V/3.3V or Adjustable,
100% Duty-Cycle, High-Efficiency,
Step-Down DC-DC Controllers
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 (IREF) ..........................................15mA
Maximum Current at EXT (IEXT) ..........................................50mA
Continuous Power Dissipation (TA = +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
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
PARAMETER
Input Voltage Range
Supply Current into V+
Undervoltage Lockout
Output Voltage
OUT Input Current
FB Threshold Voltage
FB Leakage Current
CS Input Current
CS Threshold Voltage
SHDN Input Voltage High
SHDN Input Voltage Low
SHDN Input Current
3/5 Input Voltage High
3/5 Input Voltage Low
3/5 Leakage Current
EXT Resistance
Minimum EXT Off Time
EXT Duty-Cycle Limit
Line Regulation
Load Regulation
Reference Voltage
REF Load Regulation
REF Line Regulation
SYMBOL
V+
I+
CONDITIONS
Operating, no load
V+ = SHDN = 16.5V (shutdown)
VOUT
IOUT
Circuit of Figure 1, 3/5 = V+ (Note 1)
Circuit of Figure 1, 3/5 = 0V (Note 1)
MAX1626, 3/5 = V+, output forced to 5V
MAX1627, includes hysteresis
MAX1627
VCS
SHDN = 0V or V+
3/5 = 0V or V+
V+ = 5V
Output forced to 0V
Output in regulation
VREF
6.0V < V+ < 12.0V, ILOAD = 1A
30mA < ILOAD < 2.0A, V+ = 8V
ILOAD = 0µA
0µA IREF 100µA
V+ = 3V to 16.5V, ILOAD = 0µA
MIN TYP
3.0
70
4.85
3.20
24
1.27
0
0
85
1.6
2.7
5.00
3.30
37
1.30
100
V+ - 0.5
10
8 10
1.5 2.0
100
5
15
1.27 1.30
4
10
MAX
16.5
90
1
2.8
5.15
3.40
50
1.33
35
10
115
0.4
±1
0.5
±1
12
2.5
1.33
10
100
UNITS
V
µA
V
V
µA
V
nA
µA
mV
V
V
µA
V
V
µA
Ω
µs
%
mV/V
mV/A
V
mV
µV/V
www.maximintegrated.com
Maxim Integrated | 2


Part Number MAX1627
Description Step-Down DC-DC Controllers
Maker Maxim
Total Page 16 Pages
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