MAX619ESA ,Regulated 5V Charge-Pump DC-DC ConverterGeneral Description ________
MAX619ESA ,Regulated 5V Charge-Pump DC-DC ConverterApplications_______________Ordering InformationTwo Battery Cells to 5V Conversion PART TEMP. RANGE ..
MAX619ESA ,Regulated 5V Charge-Pump DC-DC ConverterMAX61919-0227; Rev 2; 5/96Regulated 5V Charge-PumpDC-DC Converter_______________
MAX619ESA+ ,Regulated 5V Charge Pump DC-DC ConverterApplications_______________Ordering InformationTwo Battery Cells to 5V Conversion PART TEMP. RANGE ..
MAX619ESA+T ,Regulated 5V Charge Pump DC-DC ConverterFeaturesThe MAX619 step-up charge-pump DC-DC converter ♦ Regulated 5V ±4% Charge Pumpdelivers a reg ..
MAX619ESA+T ,Regulated 5V Charge Pump DC-DC ConverterMAX61919-0227; Rev 2; 5/96Regulated 5V Charge-PumpDC-DC Converter_______________
MAZY130 ,Small-signal deviceelectrical characteristicsReverse current I V Specified value within part numbers µ AR R3*Temperatu ..
MAZY360 ,Small-signal deviceFeatures•Large power dissipation: P = 1 WD•Zener voltage V : 4.7 V to 51 VZ•Zener voltage allowable ..
MAZZ062H ,Small-signal deviceElectrical characteristics within part numbers T = 25°CaZener operatingZener voltageReverse curren ..
MAZZ068H ,Small-signal deviceAbsolute Maximum Ratings T = 25°CaParameter Symbol Rating Unit*Total power dissipation P 200 mWtot ..
MAZZ082H ,Small-signal deviceelectrical characteristicsZener operating resistance R I Specified value Ωwithin part numbersZ ZRev ..
MAZZ120H ,Small-signal deviceapplications intended.(4) The products and product specifications described in this material are su ..
MAX619CPA-MAX619CSA-MAX619ESA
Regulated 5V Charge-Pump DC-DC Converter
_______________General DescriptionThe MAX619 step-up charge-pump DC-DC converter
delivers a regulated 5V ±4% output at 50mA over tem-
perature. The input voltage range is 2V to 3.6V (two
battery cells).
The complete MAX619 circuit fits into less than 0.1in2of
board space because it requires only four external
capacitors: two 0.22mF flying capacitors, and 10mF
capacitors at the input and output.
Low operating supply current (150mA max) and low
shutdown supply current (1mA max) make this device
ideal for small, portable, and battery-powered applica-
tions. When shut down, the load is disconnected from
the input.
The MAX619 is available in 8-pin DIP and SO packages.
________________________ApplicationsTwo Battery Cells to 5V Conversion
Local 3V-to-5V Conversion
Portable Instruments & Handy-Terminals
Battery-Powered Microprocessor-Based Systems
5V Flash Memory Programmer
Minimum Component DC-DC Converters
Remote Data-Acquisition Systems
Compact 5V Op-Amp Supply
Regulated 5V Supply from Lithium Backup Battery
Switching Drive Voltage for MOSFETs in
Low-Voltage Systems
____________________________FeaturesRegulated 5V ±4% Charge PumpOutput Current Guaranteed over Temperature
20mA (VIN‡
2V)
50mA (VIN‡
3V)2V to 3.6V Input RangeNo Inductors; Very Low EMI NoiseUltra-Small Application Circuit (0.1in2)Uses Small, Inexpensive Capacitors500kHz Internal OscillatorLogic-Controlled 1mA Max Shutdown
Supply Current Shutdown Disconnects Load from Input8-Pin DIP and SO Packages
_______________Ordering Information* Dice are specified at TA = +25°C.
MAX619
Regulated 5V Charge-Pump
DC-DC Converter
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
__________Typical Operating Circuit19-0227; Rev 2; 5/96
& the latest literature: http://,
MAX619
Regulated 5V Charge-Pump
DC-DC Converter________________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 2V to 3.6V, C1 = C2 = 0.22mF, C3 = C4 = 10µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
Note 1:The MAX619 is not short-circuit protected.
VINto GND............................................................-0.3V to +5.5V
VOUTto GND.........................................................-0.3V to +5.5V
SHDN to GND..............................................-0.3V to (VIN+ 0.3V)
IOUTContinuous (Note 1)..................................................120mA
Continuous Power Dissipation (TA= +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
MAX619C_ _.......................................................0°C to +70°C
MAX619E_ _....................................................-40°C to +85°C
MAX619MJA..................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +165°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.
MAX619
Regulated 5V Charge-Pump
DC-DC Converter
________________________________________________________________________________________3
__________________________________________Typical Operating Characteristics(TA = +25°C, unless otherwise noted.)10100
EFFICIENCY vs. OUTPUT CURRENT
AND INPUT VOLTAGEIOUT (mA)
EFFICIENCY (%)
INPUT CURRENT vs. OUTPUT CURRENTIOUT (mA)
IIN
(mA)2030405060708090100
160
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE
VIN (V)
IIN
OUTPUT VOLTAGE vs. OUTPUT CURRENT
IOUT (mA)
OUT
(V)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
VIN (V)
OUT
(V)
EFFICIENCY vs. INPUT VOLTAGE
VIN (V)
EFFICIENCY (%)
2.02.53.03.54.0
MAX619
Regulated 5V Charge-Pump
DC-DC Converter________________________________________________________________________________________
_______________Detailed Description
Operating PrincipleThe MAX619 provides a regulated 5V output from a 2V
to 3.6V (two battery cells) input. Internal charge pumps
and external capacitors generate the 5V output, elimi-
nating the need for inductors. The output voltage is
regulated to 5V ±4% by a pulse-skipping controller that
turns on the charge pump when the output voltage
begins to droop.
To maintain the greatest efficiency over the entire input
voltage range, the MAX619’s internal charge pump
operates as a voltage doubler when VINranges from
3.0V to 3.6V, and as a voltage tripler when VINranges
from 2.0V to 2.5V. When VINranges from 2.5V to 3.0V,
_____________________Pin Descriptionthe MAX619 switches between doubler and tripler
mode on alternating cycles, making a 2.5 x VINcharge
pump. To further enhance efficiency over the input
range, an internal comparator selects the higher of VIN
or VOUTto run the MAX619’s internal circuitry.
Efficiency with VIN= 2V and IOUT= 20mA is typically
80%.
Figure 1 shows a detailed block diagram of the
MAX619. In tripler mode, when the S1 switches close,
the S2 switches open and capacitors C1 and C2
charge up to VIN. On the second half of the cycle, C1
and C2 are connected in series between IN and OUT
when the S1 switches open and the S2 switches close,
as shown in Figure 1. In doubler mode, only C2 is
used.
During one oscillator cycle, energy is transferred from
the input to the charge-pump capacitors, and then
from the charge-pump capacitors to the output capaci-
tor and load. The number of cycles within a given time
frame increases as the load increases or as the input
supply voltage decreases. In the limiting case, the
charge pumps operate continuously, and the oscillator
frequency is nominally 500kHz.
Shutdown ModeThe MAX619 enters low-power shutdown mode when
SHDN is a logic high. SHDN is a CMOS-compatible
input. In shutdown mode, the charge-pump switching
action is halted, OUT is disconnected from IN, and
VOUTfalls to 0V. Connect SHDN to ground for normal
operation. When VIN= 3.6V, VOUTtypically reaches
5V in 0.5ms under no-load conditions after SHDN goes
low.
MAX619
Regulated 5V Charge-Pump
DC-DC Converter
________________________________________________________________________________________5Figure 1. Block Diagram
MAX619
Regulated 5V Charge-Pump
DC-DC Converter________________________________________________________________________________________
Table 1. Capacitor Suppliers
* Note: (SM) denotes surface-mount component, (TH) denotes through-hole component.
__________Applications Information
Capacitor Selection
Charge-Pump Capacitors C1 and C2The values of charge-pump capacitors C1 and C2 are
critical to ensure adequate output current and avoid
excessive peak currents. Use values in the range of
0.22mF to 1.0mF. Larger capacitors (up to 50mF) can
be used, but larger capacitors will increase output rip-
ple. Ceramic or tantalum capacitors are recommend-
ed.
Input and Output Capacitors, C3 and C4The type of input bypass capacitor (C3) and output fil-
ter capacitor (C4) used is not critical, but it does affect
performance. Tantalums, ceramics, or aluminum elec-
trolytics are suggested. For smallest size, use Sprague
595D106X0010A2 surface-mount capacitors, which
measure 3.7mm x 1.8mm (0.146in x 0.072in). For low-
est ripple, use large, low effective-series-resistance
(ESR) ceramic or tantalum capacitors. For lowest cost,
use aluminum electrolytic or tantalum capacitors.
Figure 2 shows the component values for proper oper-
ation using minimal board space. The input bypass
capacitor (C3) and output filter capacitor (C4) should
both be at least 10mF when using aluminum electrolyt-
ics or Sprague’s miniature 595D series of tantalum chip
capacitors.
When using ceramic capacitors, the values of C3 and
C4 can be reduced to 2mF and 1mF, respectively. If the
input supply source impedance is very low, C3 may not
be necessary.
Many capacitors exhibit 40% to 50% variation over
temperature. Compensate for capacitor temperature
coefficient by selecting a larger nominal value to
ensure proper operation over temperature. Table 1 lists
capacitor suppliers.
Figure 2. Two-Cell to 5V Application Circuit
