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MAX1626ESA+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
_______________General Description
The MAX1626/MAX1627 step-down DC-DC switching
controllers provide high efficiency over loads ranging
from 1mA to more than 2A. A unique current-limited,
pulse-frequency-modulated (PFM) control scheme
operates with up to a 100% duty cycle, resulting in very
low dropout voltages. This control scheme eliminates
minimum load requirements and reduces the supply
current under light loads to 90µA (versus 2mA to 10mA
for common pulse-width modulation controllers).
These step-down controllers drive an external P-chan-
nel MOSFET, allowing design flexibility for applications
to 12W or higher. Soft-start reduces current surges dur-
ing start-up. A high switching frequency (up to 300kHz)
and operation in continuous-conduction mode allow the
use of tiny surface-mount inductors. Output capacitor
requirements are also reduced, minimizing PC board
area and system costs.
The output voltage is preset at 5V or 3.3V for the
MAX1626 and adjustable for the MAX1627. Input volt-
ages can be up to 16.5V. The MAX1626/MAX1627 are
functional upgrades for the MAX1649/MAX1651.
________________________Applications
PCMCIA Power Supplies
Personal Digital Assistants
Hand-Held Computers
Portable Terminals
Low-Cost Notebook Computer Supplies
5V to 3.3V Green PC Applications
High-Efficiency Step-Down Regulation
Minimum-Component DC-DC Converters
Battery-Powered Applications
____________________________Features
♦ Low Dropout Voltage
♦ 100% Maximum Duty Cycle
♦ Soft-Start Limits Start-Up Current
♦ Efficiency >90% (3mA to 2A Loads)
♦ Output Power >12.5W
♦ 90µA Max Quiescent Current
♦ 1µA Max Shutdown Current
♦ Up to 300kHz Switching Frequency
♦ 16.5V Max Input Voltage
♦ Output Voltage: 5V/3.3V (MAX1626)
Adjustable (MAX1627)
♦ Current-Limited Control Scheme
MAX1626/MAX1627
5V/3.3V or Adjustable, 100% Duty-Cycle,
High-Efficiency, Step-Down DC-DC Controllers
________________________________________________________________
Maxim Integrated Products
1
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
19-1075; Rev 0; 6/96
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*
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
______________Ordering Information
* Dice are tested at T
A
= +25°C.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX1627ESA -40°C to +85°C 8 SO
MAX1626/MAX1627
5V/3.3V or Adjustable, 100% Duty-Cycle,
High-Efficiency, Step-Down DC-DC Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = +3V to +16.5V, SHDN = 3/5 = 0V, T
A
= 0°C to +85°C, unless otherwise noted.)
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
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS
(V+ = +3V to +16.5V, SHDN = 3/5 = 0V, T
A
= -40°C to +85°C, unless otherwise noted.) (Note 2)
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
__________________________________________Typical Operating Characteristics
(Circuit of Figure 1, T
A
= +25°C, unless otherwise noted.)
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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX1626ESA+T

Mfr. #:
Buy MAX1626ESA+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers 5/3.3V or Adjustable 100% Duty Cycle
Lifecycle:
New from this manufacturer.
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