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MAX682ESAMAXIM ?N/a270avai3.3V-Input to Regulated 5V-Output Charge Pumps
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MAX682ESA ,3.3V-Input to Regulated 5V-Output Charge PumpsApplicationsPART TEMP. RANGE PIN-PACKAGEMiniature EquipmentMAX682ESA -40°C to +85°C 8 SOPCMCIA Card ..
MAX682ESA ,3.3V-Input to Regulated 5V-Output Charge Pumpsapplications that demand a compactdesign. The MAX682, MAX683, and MAX684 deliver' 1.1mm Height in µ ..
MAX682ESA ,3.3V-Input to Regulated 5V-Output Charge PumpsFeaturesThe MAX682/MAX683/MAX684 charge-pump regula-' Ultra-Small: 1µF Capacitors per 100mA of Outp ..
MAX682ESA+ ,3.3V Input to Regulated 5V Output Charge PumpsApplicationsMAX684EUA -40°C to +85°C 8 μMAXBackup-Battery Boost Converters3V to 5V GSM SIMM CardsTy ..
MAX682ESA+ ,3.3V Input to Regulated 5V Output Charge PumpsApplicationsMAX684EUA -40°C to +85°C 8 μMAXBackup-Battery Boost Converters3V to 5V GSM SIMM CardsTy ..
MAX682ESA+T ,3.3V Input to Regulated 5V Output Charge PumpsMAX682/MAX683/MAX68419-0177; Rev 1; 8/983.3V-Input to Regulated 5V-OutputCharge Pumps
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MAX682ESA-MAX683EUA-MAX684EUA
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.
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
Features
Ultra-Small: 1µF Capacitors per 100mA of Output
Current
No Inductors Required1.1mm Height in µMAX Package (MAX683/MAX684)Up to 250mA Output Current (MAX682)Regulated ±4% Output Voltage50kHz to 2MHz Adjustable Switching Frequency2.7V to 5.5V Input Voltage100µA Quiescent Current in Pulse-Skipping Mode0.1µA Shutdown Current
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
Pin Configurations
Typical Operating Circuit

19-0177; Rev 1; 8/98
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VIN= 3V, VSKIP= 0V, CIN= 1µF, CX= 0.47µF, COUT= 2µF, ISHDN= 22µA; IMAX= 250mA for MAX682, IMAX= 100mA for MAX683,
IMAX= 50mA for MAX684; TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
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.
IN, OUT,SHDN, SKIPto GND.................................-0.3V to +6V
PGND to GND.....................................................................±0.3V
CXN to GND................................................-0.3V to (VIN+ 0.3V)
CXP to GND..............................................-0.3V to (VOUT+ 0.3V)
Continuous Output Current
MAX682........................................................................300mA
MAX683........................................................................150mA
MAX684..........................................................................75mA
Output Short-Circuit Duration...............................................5sec
Continuous Power Dissipation (TA= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C).................471mW
8-Pin µMAX (derate 4.1mW/°C above +70°C)............330mW
Operating Temperature Range
MAX68_E_A....................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
ELECTRICAL CHARACTERISTICS (continued)

(VIN= 3V, VSKIP= 0V, CIN= 1µF, CX= 0.47µF, COUT= 2µF, ISHDN= 22µA; IMAX= 250mA for MAX682, IMAX= 100mA for MAX683,
IMAX= 50mA for MAX684; TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
Note 1:
Specifications to -40°C are guaranteed by design and not production tested.
Note 2:
Current into SHDNdetermines oscillator frequency: REXT(kΩ) = 45000 (VIN- 0.69V) / fOSC(kHz)
__________________________________________Typical Operating Characteristics

(Circuit of Figure 5, VIN= 3.3V, component values from Tables 2 and 3, TA = +25°C, unless otherwise noted.)
MAX682/MAX683/MAX684
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.)
MAX682/MAX683/MAX684
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.)
Pin Description
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
Detailed Description

The MAX682/MAX683/MAX684 charge pumps provide
a regulated 5V output from a 2.7V to 5.5V input. They
deliver a maximum of 250mA, 100mA, or 50mA load
current, respectively. Designed specifically for com-
pact applications, a complete regulator circuit requires
only three small external capacitors and one resistor.
An externally adjustable switching frequency and inno-
vative control scheme allow the circuit to be optimized
for efficiency, size, or output noise. The devices also
contain a shutdown feature.
The MAX682/MAX683/MAX684 consist of an error
amplifier, a 1.23V bandgap reference, an internal resis-
tive feedback network, an oscillator, high-current MOS-
FET switches, and shutdown and control logic (Figure
1). Figure 2 shows an idealized unregulated charge-
pump voltage doubler. The oscillator runs at a 50%
duty cycle. During one half of the period, the transfer
capacitor (CX) charges to the input voltage. During the
other half, the doubler stacks the voltage across CX
and the input voltage, and transfers the sum of the two
voltages to the output filter capacitor (COUT). Rather
than simply doubling the input voltage, the
MAX682/MAX683/MAX684 provide a regulated fixed
output voltage (5V) using either skip mode or constant-
frequency mode. Skip mode and constant-frequency
mode are externally selected via the SKIPinput pin.
Skip Mode

In skip mode (SKIP= low), the error amplifier disables
switching when it detects an output higher than 5V. The
device then skips switching cycles until the output volt-
age drops. Then the error amplifier reactivates the
oscillator. Figure 3 illustrates the regulation scheme.
This regulation method minimizes operating current
because the device does not switch continuously. SKIP
is a logic input and should not remain floating.
Constant-Frequency Mode

When SKIPis high, the charge pump runs continuously
at the selected frequency. Figure 4 shows a block dia-
gram of the device in constant-frequency mode. The
error amplifier controls the charge on CXby driving the
gate of the N-channel FET. When the output voltage
falls, the gate drive increases, resulting in a larger volt-
age across CX. This regulation scheme minimizes out-
put ripple. Since the device switches continuously, the
Figure 2. Unregulated Voltage Doubler
Figure 3. Skip-Mode Regulation
Figure 1. Functional Block Diagram
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