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MAX651 の電気的特性と機能

MAX651のメーカーはMaxim Integratedです、この部品の機能は「Step-Down DC-DC Controllers」です。


製品の詳細 ( Datasheet PDF )

部品番号 MAX651
部品説明 Step-Down DC-DC Controllers
メーカ Maxim Integrated
ロゴ Maxim Integrated ロゴ 




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MAX651 Datasheet, MAX651 PDF,ピン配置, 機能
19-0225; Rev 3; 9/97
EVAALVUAAILTAIOBNLEKIT
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
_______________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
o More than 90% Efficiency (10mA to 1.5A Loads)
o More than 12.5W Output Power
o 100µA Max Quiescent Supply Current
o 5µA Max Shutdown Supply Current
o Less than 1.0V Dropout Voltage
o 16.5V Max Input Voltage
o 5V (MAX649), 3.3V (MAX651), 3V (MAX652),
or Adjustable Output Voltage
o Current-Limited Control Scheme
o Up to 300kHz Switching Frequency
______________Ordering Information
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**
Ordering Information continued at end of data sheet.
* Dice are tested at TA = +25°C.
**Contact factory for availability and processing to MIL-STD-883.
__________Typical Operating Circuit __________________Pin Configuration
INPUT
4V TO 16.5V
TOP VIEW
ON/OFF
V+
MAX651
SHDN
CS
EXT
REF OUT
FB GND
P
OUTPUT
3.3V
OUT 1
FB 2
SHDN 3
REF 4
MAX649
MAX651
MAX652
8 GND
7 EXT
6 CS
5 V+
DIP/SO
________________________________________________________________ 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 1-800-835-8769.
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1 Page





MAX651 pdf, ピン配列
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
Output Voltage
Load Regulation
Circuit of
Figure 1
CONDITIONS
MAX649, 0 ILOAD 1.5A,
VIN = 10V
MAX651, 0 ILOAD 1.5A,
VIN = 5V
MIN TYP MAX UNITS
-47
-45 mV/A
MAX652, 0 ILOAD 1.5A,
VIN = 5V
-45
MAX649, V+ = 10V,
ILOAD = 1A
92
Efficiency
Circuit of
Figure 1
MAX651, V+ = 5V,
ILOAD = 1A
89 %
MAX652, V+ = 5V,
ILOAD = 1A
88
SHDN Input Current
V+ = 16.5V, SHDN = 0V or V+
1 µA
SHDN Input Voltage High
SHDN Input Voltage Low
Current-Limit Trip
Level (V+ to CS)
CS Input Current
VIH
VIL
VCS
4V V+ 16.5V
4V V+ 16.5V
4V V+ 16.5V
4V V+ 16.5V
1.6 V
0.4 V
MAX649C/E, MAX65_C/E 180 210 240
mV
MAX649M, MAX65_M
160 210 260
±1 µA
Switch Maximum
On-Time
tON
(max)
V+ = 12V
12 16 20 µs
Switch Minimum
Off-Time
EXT Rise Time
EXT Fall Time
tOFF
(min)
V+ = 12V
CEXT = 0.001µF, V+ = 12V
CEXT = 0.001µF, V+ = 12V
1.8 2.3 2.8 µs
50 ns
50 ns
_______________________________________________________________________________________ 3
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3Pages


MAX651 電子部品, 半導体
5V/3.3V/3V or Adjustable, High-Efficiency,
Low IQ, Step-Down DC-DC Controllers
_____________________________Typical Operating Characteristics (continued)
MAX649
LINE-TRANSIENT RESPONSE
MAX649
LOAD-TRANSIENT RESPONSE
A
A
250µs/div
ILOAD = 1A
A: INPUT VOLTAGE (7V & 12V), 5V/div
B: 5V OUT, AC COUPLED, 100mV/div
B
B
250µs/div
A: LOAD CURRENT (100mA & 1A), 500mA/div
B: 5V OUTPUT VOLTAGE, AC COUPLED, 50mV/div
MAX649
SHUTDOWN RESPONSE TIME
A
B
1ms/div
ILOAD = 1A
A: SHDN INPUT VOLTAGE (0V & 5V), 2V/div
B: 5V OUTPUT VOLTAGE, 2V/div
______________________________________________________________Pin Description
PIN NAME
FUNCTION
1
OUT
Sense input for fixed 5V, 3.3V, or 3V output operation. OUT is internally connected to the on-chip voltage divider.
Although it is connected to the output of the circuit, the OUT pin does not supply current.
2
FB
Feedback input. Connect to GND for fixed-output operation. Connect a resistor divider between OUT, FB,
and GND for adjustable-output operation. See Setting the Output Voltage section.
3
SHDN
Active-high TTL/CMOS logic-level input. Part is placed in shutdown when SHDN is driven high. In shutdown mode,
the reference and the external MOSFET are turned off, and OUT = 0V. Connect to GND for normal operation.
4 REF 1.5V reference output that can source 100µA. Bypass with 0.1µF.
5 V+ Positive power-supply input
6
CS
Current-sense input. Connect current-sense resistor between V+ and CS. When the voltage across the
resistor equals the current-limit trip level, the external MOSFET is turned off.
7 EXT Gate drive for external P-channel MOSFET. EXT swings between V+ and GND.
8 GND Ground
6 _______________________________________________________________________________________
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