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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1652 Datasheet

High-Efficiency / PWM / Step-Down DC-DC Controllers in 16-Pin QSOP

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MAX1652 pdf
19-1357; Rev 1; 7/98
EVAALVUAAILTAIOBNLEKIT
High-Efficiency, PWM, Step-Down
DC-DC Controllers in 16-Pin QSOP
General Description
The MAX1652–MAX1655 are high-efficiency, pulse-
width-modulated (PWM), step-down DC-DC controllers
in small QSOP packages. The MAX1653/MAX1655 also
come in 16-pin narrow SO packages that are pin-
compatible upgrades to the popular MAX797. Improve-
ments include higher duty-cycle operation for better
dropout, lower quiescent supply currents for better
light-load efficiency, and an output voltage down to 1V
(MAX1655).
The MAX1652–MAX1655 achieve up to 96% efficiency
and deliver up to 10A using a unique Idle Mode™ syn-
chronous-rectified PWM control scheme. These devices
automatically switch between PWM operation at heavy
loads and pulse-frequency-modulated (PFM) operation
at light loads to optimize efficiency over the entire out-
put current range. The MAX1653/MAX1655 also feature
logic-controlled, forced PWM operation for noise-sensi-
tive applications.
All devices operate with a selectable 150kHz/300kHz
switching frequency, which can also be synchronized
to an external clock signal. Both external power switch-
es are inexpensive N-channel MOSFETs, which provide
low resistance while saving space and reducing cost.
The MAX1652 and MAX1654 have an additional feed-
back pin that permits regulation of a low-cost second
output tapped from a transformer winding. The
MAX1652 provides an additional positive output. The
MAX1654 provides an additional negative output.
The MAX1652–MAX1655 have a 4.5V to 30V input volt-
age range. The MAX1652/MAX1653/MAX1654’s output
range is 2.5V to 5.5V while the MAX1655’s output range
extends down to 1V. An evaluation kit (MAX1653EVKIT)
is available to speed designs.
Applications
Notebook Computers
PDAs
Cellular Phones
Hand-Held Computers
Handy-Terminals
Mobile Communicators
Distributed Power
Pin Configurations appear at end of data sheet.
Idle Mode is a trademark of Maxim Integrated Products.
____________________________Features
o 96% Efficiency
o Small, 16-Pin QSOP Package
(half the size of a 16-pin narrow SO)
o Pin-Compatible with MAX797 (MAX1653/MAX1655)
o Output Voltage Down to 1V (MAX1655)
o 4.5V to 30V Input Range
o 99% Duty Cycle for Lower Dropout
o 170µA Quiescent Supply Current
o 3µA Logic-Controlled Shutdown
o Dual, N-Channel, Synchronous-Rectified Control
o Fixed 150kHz/300kHz PWM Switching,
or Synchronized from 190kHz to 340kHz
o Programmable Soft Start
o Low-Cost Secondary Outputs (MAX1652/MAX1654)
PART
MAX1652EEE
MAX1653ESE
MAX1653EEE
MAX1654EEE
MAX1655ESE
MAX1655EEE
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
16 QSOP
16 Narrow SO
16 QSOP
16 QSOP
16 Narrow SO
16 QSOP
Selection Guide
PART
FEEDBACK
VOLTAGE (V)
SPECIAL
FEATURE
COMPATIBILITY
Regulates positive Same pin order
MAX1652 2.5 secondary voltage as MAX796, but
(such as +12V) smaller package
MAX1653
2.5
Logic-controlled, Pin-compatible
low-noise mode with MAX797
Regulates negative Same pin order
MAX1654 2.5 secondary voltage as MAX799, but
(such as -5V)
smaller package
Low output volt- Pin compatible
MAX1655
1
ages (1V to 5.5V); with MAX797
logic-controlled, (except for feed-
low-noise mode back voltage)
________________________________________________________________ Maxim Integrated Products 1
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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX1652 Datasheet

High-Efficiency / PWM / Step-Down DC-DC Controllers in 16-Pin QSOP

No Preview Available !

MAX1652 pdf
High-Efficiency, PWM, Step-Down
DC-DC Controllers in 16-Pin QSOP
ABSOLUTE MAXIMUM RATINGS
V+ to GND ..............................................................-0.3V to +36V
GND to PGND .......................................................-0.3V to +0.3V
VL to GND ................................................................-0.3V to +6V
BST to GND ............................................................-0.3V to +36V
DH to LX .....................................................-0.3V to (BST + 0.3V)
LX to BST..................................................................-6V to +0.3V
SHDN to GND...............................................-0.3V to (V+ + 0.3V)
SYNC, SS, REF, SECFB, SKIP, FB to GND...-0.3V to (VL + 0.3V)
DL to PGND ..................................................-0.3V to (VL + 0.3V)
CSH, CSL to GND ....................................................-0.3V to +6V
VL Short Circuit to GND..............................................Momentary
REF Short Circuit to GND ...........................................Continuous
VL Output Current ...............................................+50mA to -1mA
REF Output Current...............................................+5mA to -1mA
Continuous Power Dissipation (TA = +70°C)
SO (derate 8.70mW/°C above +70°C) .......................696mW
QSOP (derate 8.3mW/°C above +70°C) ....................667mW
Operating Temperature Range
MAX165_E_E ..................................................-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
(V+ = +15V, GND = PGND = 0V, SYNC = REF, IVL = IREF = 0A, TA = 0°C to +85°C, unless otherwise noted.)
PARAMETER
CONDITIONS
MIN TYP
3.3V AND 5V STEP-DOWN CONTROLLERS
Input Supply Range
4.5
5V Output Voltage (CSL)
0 < (CSH - CSL) < 80mV, FB = VL, 6V < V+ < 30V,
includes line and load regulation
4.85 5.06
3.3V Output Voltage (CSL)
0 < (CSH - CSL) < 80mV, FB = 0V, 4.5V < V+ < 30V,
includes line and load regulation
3.20 3.34
Nominal Adjustable Output
Voltage Range
External resistor divider
MAX1655
MAX1652/MAX1653/
MAX1654
1
2.5
Feedback Voltage
CSH - CSL = 0V, CSL = FB,
SKIP = 0V, 4.5V < V+ < 30V
MAX1655
MAX1652/MAX1653/
MAX1654
0.97
2.43
1.00
2.50
Load Regulation
0 < (CSH - CSL) < 80mV
25mV < (CSH - CSL) < 80mV
Line Regulation
6V < V+ < 30V
Current-Limit Voltage
CSH - CSL, positive
CSH - CSL, negative
SS Source Current
VSS = 0V
SS Fault Sink Current
VSS = 4V
FLYBACK/PWM CONTROLLER
SECFB Regulation Setpoint
Falling edge, rising edge, hysteresis = 22mV (MAX1652)
Rising edge, falling edge, hysteresis = 22mV (MAX1654)
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
SHDN = 2V, 0 < IVL < 25mA, 5.5V < V+ < 30V
VL Fault Lockout Voltage
Rising edge, falling edge hysteresis = 50mV
VL/CSL Switchover Voltage
Rising edge, falling edge hysteresis = 60mV
2
1.2
0.03
80 100
-50 -100
2.5 4.0
2.0
2.45
-0.05
2.50
0
4.7 5.0
3.8 3.9
4.2 4.5
MAX UNITS
30 V
5.25 V
3.46 V
5.5
V
5.5
1.03
V
2.57
0.06
120
-160
6.5
%
%/V
mV
µA
mA
2.55
V
0.05
5.3 V
4.0 V
4.7 V
2 _______________________________________________________________________________________


Part Number MAX1652
Description High-Efficiency / PWM / Step-Down DC-DC Controllers in 16-Pin QSOP
Maker Maxim
Total Page 28 Pages
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