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PDF MAX682 Data sheet ( Hoja de datos )
| Número de pieza | MAX682 | |
| Descripción | 3.3V-Input to Regulated 5V-Output Charge Pumps | |
| Fabricantes | Maxim Integrated | |
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19-0177; Rev 1; 8/98
3.3V-Input to Regulated 5V-Output
Charge Pumps
General Description
The MAX682/MAX683/MAX684 charge-pump regula-
tors generate 5V from a 2.7V to 5.5V input. They are
specifically designed to serve as high-efficiency auxil-
iary supplies in applications that demand a compact
design. The MAX682, MAX683, and MAX684 deliver
250mA, 100mA, and 50mA output current, respectively.
These complete 5V regulators require only one resistor
and three external capacitors—no inductors are need-
ed. High switching frequencies (externally adjustable
up to 2MHz) and a unique regulation scheme allow the
use of capacitors as small as 1µF per 100mA of output
current. The MAX683/MAX684 are offered in a space-
saving 8-pin µMAX package that is only 1.1mm high,
while the MAX682 is available in an 8-pin SO.
Features
o Ultra-Small: 1µF Capacitors per 100mA of Output
Current
o No Inductors Required
o 1.1mm Height in µMAX Package (MAX683/MAX684)
o Up to 250mA Output Current (MAX682)
o Regulated ±4% Output Voltage
o 50kHz to 2MHz Adjustable Switching Frequency
o 2.7V to 5.5V Input Voltage
o 100µA Quiescent Current in Pulse-Skipping Mode
o 0.1µA Shutdown Current
Applications
Flash Memory Supplies
Battery-Powered Applications
Miniature Equipment
PCMCIA Cards
3.3V to 5V Local Conversion Applications
Backup-Battery Boost Converters
3V to 5V GSM SIMM Cards
PART
MAX682ESA
MAX683EUA
MAX684EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 µMAX
8 µMAX
Typical Operating Circuit
Pin Configurations
INPUT
2.7V TO 5.5V
REXT
CXN CXP
MAX682
IN OUT
SKIP
SHDN
GND
PGND
OUTPUT
5V/250mA
TOP VIEW
SKIP 1
SHDN 2
IN 3
GND 4
MAX682
SO
8 OUT SKIP 1
7 CXP SHDN 2
6 CXN
IN 3
5 PGND GND 4
MAX683
MAX684
µMAX
8 OUT
7 CXP
6 CXN
5 PGND
________________________________________________________________ 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.
1 page  
3.3V-Input to Regulated 5V-Output
Charge Pumps
Typical Operating Characteristics (continued)
(Circuit of Figure 5, VIN = 3.3V, component values from Tables 2 and 3, TA = +25°C, unless otherwise noted.)
SHUTDOWN TIMING
MAX682 TOC18
A
LINE-TRANSIENT RESPONSE
MAX682 TOC20
A
LOAD-TRANSIENT RESPONSE
MAX682 TOC19
A
BB
B
100µs/div
A: OUTPUT VOLTAGE: SKIP = HIGH, RL = 5V / IMAX, 2V/div
B: SHDN VOLTAGE: 1V/div
2ms/div
A: INPUT VOLTAGE: VIN = 3.1V TO 3.6V, 500mV/div
B: OUTPUT VOLTAGE: SKIP = HIGH, ISHDN = 22µA,
ILOAD = 250mA, 50mV/div, MAX682
2ms/div
A: LOAD CURRENT: ILOAD = 5mA TO 250mA, 500mA/div
B: OUTPUT VOLTAGE: SKIP = HIGH, ISHDN = 22µA,
100mV/div, MAX682
Pin Description
PIN NAME
FUNCTION
When SKIP = low, the regulator operates in low-quiescent-current skip mode. When SKIP = high, the
1
SKIP
regulator operates in constant-frequency mode, minimizing output ripple and noise. SKIP must be tied
high for input voltages above 3.6V.
Shutdown Input. Drive SHDN through an external resistor. When SHDN = low, the device turns off. When
2 SHDN current is sourced into SHDN through REXT, the device activates, and the SHDN pin input current sets the
oscillator’s switching frequency. REXT (kΩ) = 45000 (V IN - 0.69V) / fOSC (kHz).
3
IN
Input Supply Pin. Can range from 2.7V to 5.5V for SKIP = high, and 2.7V to 3.6V for SKIP = low. Bypass to
PGND with a suitable value capacitor (see Capacitor Selection section).
4 GND Ground Pin. Connect to PGND through a short trace.
5 PGND Power Ground Pin
6 CXN Negative Terminal of the Charge-Pump Transfer Capacitor
7
CXP
Positive Terminal of the Charge-Pump Transfer Capacitor
8 OUT Fixed 5V Power Output. Bypass to PGND with output filter capacitor.
_______________________________________________________________________________________ 5
5 Page 
3.3V-Input to Regulated 5V-Output
Charge Pumps
NOTES
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX682.PDF ] | |
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