Document
19-0177; Rev 1; 8/98
3.3V-Input to Regulated 5V-Output Charge Pumps
General Description
The MAX682/MAX683/MAX684 charge-pump regulators generate 5V from a 2.7V to 5.5V input. They are specifically designed to serve as high-efficiency auxiliary 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 needed. 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 spacesaving 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
MAX682/MAX683/MAX684
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
TOP VIEW
CXN INPUT 2.7V TO 5.5V REXT CXP
SKIP 1 8 7
Pin Configurations
OUT CXP CXN PGND
SKIP 1 SHDN IN 2 3
8 7
OUT CXP CXN PGND
MAX682
IN SKIP SHDN GND PGND OUT
OUTPUT 5V/250mA
SHDN IN
2
MAX682
3 6 5 GND 4 GND 4
MAX683 MAX684
6 5
SO
µMAX
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1
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3.3V-Input to Regulated 5V-Output Charge Pumps MAX682/MAX683/MAX684
ABSOLUTE MAXIMUM RATINGS
IN, OUT, SHDN, SKIP to 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
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
(VIN = 3V, V SKIP = 0V, CIN = 1µF, CX = 0.47µF, COUT = 2µF, I SHDN = 22µA; IMAX = 250mA for MAX682, IMAX = 100mA for MAX683, IMAX = 50mA for MAX684; TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Input Voltage Range Input Undervoltage Lockout Threshold Input Undervoltage Lockout Hysteresis Output Voltage VOUT 0 < ILOAD ≤ IMAX; 3.0V ≤ IN ≤ 3.6V for SKIP = 0, 3.0V ≤ IN ≤ 3.6V for SKIP = 0, 3.0V ≤ IN ≤ 5.5V for SKIP = IN MAX682 Maximum Output Current IMAX MAX683 MAX684 SKIP = 0, VIN = 3.6V No-Load Input Current IQ MAX682 SKIP = VIN = 3.6V MAX683 MAX684 Load Regulation SHDN Logic Low Input SHDN On Bias Voltage SHDN Input Current Range ∆VLDR VINL, SHDN VON, SHDN TA = +25°C ISHDN (Note 2) ISHDN = 22µA Switching Frequency (Note 2) ISHDN =4.4µA Shutdown Supply Current Shutdown Exit Time IQ, SHDN tSTART 0°C < TA < +85°C -40°C < TA < +85°C 0°C < TA < +85°C -40°C < TA < +85°C 630 1 850 750 160 150 1000 1000 200 200 0.1 50 690 SKIP = high, 0 ≤ ILOAD ≤ IMAX 4.80 250 100 50 0.1 7.5 2.5 1.7 -3 0.35 750 50 1200 1300 250 270 5 µA µs kHz % V mV µA 0.18 mA mA SYMBOL VIN CONDITIONS Regulation with VIN > 3.6V requires SKIP = high MIN 2.7 2.0 2.35 100 TYP MAX 5.5 2.6 UNITS V V mV
5.05
5.20
V
SHDN = 0, VIN = 5.5V, VOUT =.