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MAX651ESA+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16
_______________General Description
The MAX649/MAX651/MAX652 BiCMOS, step-down DC-
DC switching controllers provide high efficiency over
three decades of load current. A unique, current-limited
pulse-frequency-modulated (PFM) control scheme gives
these devices the benefits of pulse-width-modulation
(PWM) converters (high efficiency at heavy loads), while
using only 100µA of supply current (vs. 2mA to 10mA for
PWM converters). The result is high efficiency over loads
ranging from 10mA to more than 2.5A.
These devices use miniature external components.
Their high switching frequency (up to 300kHz) allows
for less than 9mm diameter surface-mount inductors.
The MAX649/MAX651/MAX652 have dropout voltages
less than 1V and accept input voltages up to 16.5V.
Output voltages are preset at 5V (MAX649), 3.3V
(MAX651), and 3V (MAX652). These controllers can
also be adjusted to any voltage from 1.5V to the input
voltage by using two resistors.
These step-down controllers drive external P-channel
MOSFETs at loads greater than 10W. If less power is
required, use the MAX639/MAX640/MAX653 step-down
converters with on-chip FETs, which allow up to a
225mA load current.
________________________Applications
5V-to-3.3V Green PC Applications
High-Efficiency Step-Down Regulation
Minimum-Component DC-DC Converters
Battery-Powered Applications
____________________________Features
♦ More than 90% Efficiency (10mA to 1.5A Loads)
♦ More than 12.5W Output Power
♦ 100µA Max Quiescent Supply Current
♦ 5µA Max Shutdown Supply Current
♦ Less than 1.0V Dropout Voltage
♦ 16.5V Max Input Voltage
♦ 5V (MAX649), 3.3V (MAX651), 3V (MAX652),
or Adjustable Output Voltage
♦ Current-Limited Control Scheme
♦ Up to 300kHz Switching Frequency
______________Ordering Information
Ordering Information continued at end of data sheet.
* Dice are tested at T
A
= +25°C.
**Contact factory for availability and processing to MIL-STD-883.
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
GND
EXT
CS
V+
REF
SHDN
FB
OUT
DIP/SO
TOP VIEW
MAX649
MAX651
MAX652
__________________Pin Configuration
__________Typical Operating Circuit
19-0225; Rev 3; 9/97
PART TEMP. RANGE PIN-PACKAGE
MAX649CPA
0°C to +70°C 8 Plastic DIP
MAX649CSA 0°C to +70°C 8 SO
MAX649C/D 0°C to +70°C Dice*
MAX649EPA -40°C to +85°C 8 Plastic DIP
MAX649ESA -40°C to +85°C 8 SO
MAX649MJA -55°C to +125°C 8 CERDIP**
MAX651
V+
CSSHDN
FB GND
ON/OFF
P
EXT
REF
OUT
OUTPUT
3.3V
INPUT
4V TO 16.5V
EVALUATION KIT
AVAILABLE
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°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.
PARAMETER SYMBOL MIN TYP MAX UNITS
1.455 1.5 1.545
1.4625 1.5 1.5375FB Trip Point
1.470 1.5 1.530
V
I
Q
25
FB Input Current I
FB
±50
nA
±70
±90
Output Voltage V
OUT
4.80 5.0 5.20
V
Supply Current
V+ Input Voltage Range V+ 4.0 16.5 V
80 100
µA
4
3.17 3.3 3.43
2.88 3.0 3.12
Reference Voltage V
REF
1.470 1.5 1.530
V
1.4625 1.5 1.5375
1.455 1.5 1.545
REF Load Regulation
410
mV
415
CONDITIONS
MAX649M, MAX65_M
Circuit of
Figure 1
MAX649E, MAX65_E
MAX649C, MAX65_C
V+ = 10V, SHDN ≥ 1.6V (shutdown)
MAX649C, MAX65_C
MAX649E, MAX65_E
MAX649C, MAX65_C, I
REF
= 0
MAX649E, MAX65_E, I
REF
= 0
MAX649M, MAX65_M
MAX649M, MAX65_M, I
REF
= 0
V+ = 16.5V, SHDN ≤ 0.4V (operating, switch off)
V+ = 16.5V, SHDN ≥ 1.6V (shutdown)
Supply Voltage, V+ to GND.......................................-0.3V, +17V
REF, SHDN, FB, CS, EXT, OUT.......................-0.3V, (V+ + 0.3V)
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
MAX649C_A, MAX65_C_A ..................................0°C to +70°C
MAX649E_A, MAX65_E_A................................-40°C to +85°C
MAX649MJA, MAX65_MJA ............................-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX649, V+ = 6V to 16.5V
MAX651, V+ = 4V to 16.5V
MAX652, V+ = 4V to 16.5V
MAX649C/E, MAX65_C/E
MAX649M, MAX65_M
0 ≤ I
REF
≤ 100µA,
sourcing only
4V ≤ V+ ≤ 16.5VREF Line Regulation 40 100 µV/V
2.6
mV/V
1.7
1.9
Output Voltage
Line Regulation
Circuit of
Figure 1
MAX649, 6V ≤ V+ ≤ 16V,
I
LOAD
= 1A
MAX651, 4.5V ≤ V+ ≤ 16V,
I
LOAD
= 1A
MAX652, 4V ≤ V+ ≤ 16V,
I
LOAD
= 1A
MAX649/MAX651/MAX652
5V/3.3V/3V or Adjustable, High-Efficiency,
Low I
Q
, Step-Down DC-DC Controllers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.)
PARAMETER
SYMBOL MIN TYP MAX
-45
UNITS
V+ = 16.5V, SHDN = 0V or V+
-45
SHDN Input Current 1 µA
Output Voltage
Load Regulation
-47
mV/A
CONDITIONS
Circuit of
Figure 1
MAX649, 0 ≤ I
LOAD
≤ 1.5A,
V
IN
= 10V
MAX651, 0 ≤ I
LOAD
≤ 1.5A,
V
IN
= 5V
MAX652, 0 ≤ I
LOAD
≤ 1.5A,
V
IN
= 5V
MAX649, V+ = 10V,
I
LOAD
= 1A
MAX651, V+ = 5V,
I
LOAD
= 1A
89
MAX652, V+ = 5V,
I
LOAD
= 1A
88
Efficiency
92
%
Circuit of
Figure 1
4V ≤ V+ ≤ 16.5VSHDN Input Voltage High 1.6 VV
IH
4V ≤ V+ ≤ 16.5V 0.4 VV
IL
SHDN Input Voltage Low
4V ≤ V+ ≤ 16.5VCS Input Current ±1 µA
V+ = 12V 12 16 20 µs
t
ON
(max)
Switch Maximum
On-Time
C
EXT
= 0.001µF, V+ = 12VEXT Rise Time 50 ns
C
EXT
= 0.001µF, V+ = 12VEXT Fall Time 50 ns
V+ = 12V
Switch Minimum
Off-Time
1.8 2.3 2.8 µs
t
OFF
(min)
MAX649C/E, MAX65_C/E
Current-Limit Trip
Level (V+ to CS)
180 210 240
mVV
CS
MAX649M, MAX65_M 160 210 260
4V ≤ V+ ≤ 16.5V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P16

MAX651ESA+

Mfr. #:
Buy MAX651ESA+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers 5V/3.3V/3V or Adj Low-IQ Step-Down
Lifecycle:
New from this manufacturer.
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