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MAX619
User Manual
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Rainbow Electronics MAX619 User Manual

19-0227; Rev 2; 5/96
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Regulated 5V Charge-Pump
_______________General Description
The MAX619 step-up charge-pump DC-DC converter delivers a regulated 5V ±4% output at 50mA over tem­perature. 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 0.22µF flying capacitors, and 10µF capacitors at the input and output.
Low operating supply current (150µA max) and low shutdown supply current (1µA max) make this device ideal for small, portable, and battery-powered applica­tions. When shut down, the load is disconnected from the input.
The MAX619 is available in 8-pin DIP and SO packages.
________________________Applications
Two 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
__________________Pin Configuration
DC-DC Converter
____________________________Features
♦ Regulated 5V ±4% Charge Pump ♦ Output Current Guaranteed over Temperature
20mA (VIN≥ 2V) 50mA (V
♦ 2V to 3.6V Input Range ♦ No Inductors; Very Low EMI Noise ♦ Ultra-Small Application Circuit (0.1in ♦ Uses Small, Inexpensive Capacitors ♦ 500kHz Internal Oscillator ♦ Logic-Controlled 1µA Max Shutdown
Supply Current
♦ Shutdown Disconnects Load from Input ♦ 8-Pin DIP and SO Packages
_______________Ordering Information
PART TEMP. RANGE PIN-PACKAGE
MAX619CPA 0°C to +70°C 8 Plastic DIP MAX619CSA 0°C to +70°C 8 SO MAX619C/D 0°C to +70°C Dice* MAX619EPA -40°C to +85°C 8 Plastic DIP MAX619ESA -40°C to +85°C 8 SO MAX619MJA -55°C to +125°C 8 CERDIP
* Dice are specified at TA = +25°C.
__________Typical Operating Circuit
IN
≥ 3V)
2
)
MAX619
TOP VIEW
INPUT
2V to 3.6V
10µF
C1+
1
IN
2
OUT
C2+
MAX619
3
4
DIP/SO
________________________________________________________________
C1-
8
 SHDN
7
 GND
6
 C2-
5
ON/OFF
0.22µF
IN 
SHDN C1+
C1-
OUT
MAX619
C2+
C2-
GND
Maxim Integrated Products
10µF
0.22µF
OUTPUT
5V, 20mA
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
Regulated 5V Charge-Pump DC-DC Converter
ABSOLUTE MAXIMUM RATINGS
VINto GND ............................................................-0.3V to +5.5V
to GND.........................................................-0.3V to +5.5V
V
OUT
SHDN to GND..............................................-0.3V to (V
Continuous (Note 1)..................................................120mA
I
OUT
Continuous Power Dissipation (T
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
MAX619
CERDIP (derate 8.00mW/°C above +70°C).................640mW
= +70°C)
A
IN
+ 0.3V)
Note 1: The MAX619 is not short-circuit protected.
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= 2V to 3.6V, C1 = C2 = 0.22µF, C3 = C4 = 10µF, TA= T
PARAMETER SYMBOL MIN TYP MAX UNITS
Input Voltage V
Output Voltage V
Output Ripple V No-Load Supply Current 75 170
Shutdown Supply Current
Efficiency Eff %
Switching Frequency 500 kHz SHDN Input Threshold
SHDN Input Current I
IN
OUT
RIPPLE
I
IN
V
IH
V
IL
IH
2.0V ≤ VIN≤ 3.6V, 0mA ≤ I
3.0V ≤ VIN≤ 3.6V, 0mA ≤ I
3.0V ≤ VIN≤ 3.6V, 0mA ≤ I
3.0V ≤ VIN≤ 3.6V, 0mA ≤ I
2V ≤ V
≤ 3.6V, I
IN
2V ≤V
IN
V
SHDN
VIN= 3V, I VIN= 3V, I VIN= 2V, I
= V
≤
3.6V, I
IN OUT
OUT OUT
OUT
OUT
= 20mA = 30mA = 20mA
At full load
V
= V
SHDN
IN
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
to T
MIN
, unless otherwise noted. Typical values are at TA= +25°C.)
MAX
CONDITIONS
2 3.6 V
≤ 20mA
OUT
≤ 50mA, MAX619C
OUT
≤ 45mA, MAX619E
OUT
≤ 40mA, MAX619M
OUT
4.8 5.0 5.2 V
100 mVNo load to full load
= 0mA
= 0mA,
MAX619C/E MAX619M
0.02 1
82 82 80
0.7 x V
IN
MAX619C/E MAX619M
10
0.4 ±1
±10
µA µA
V
µA
2 ________________________________________________________________________________________
Regulated 5V Charge-Pump
DC-DC Converter
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
EFFICIENCY vs. OUTPUT CURRENT 
90
85
80
75
70
EFFICIENCY (%)
65
60
AND INPUT VOLTAGE
VIN = 2.0V
1 10 100
I
OUT
(mA)
OUTPUT VOLTAGE vs. OUTPUT CURRENT
5.05
5.00
4.95
(V)
4.90
OUT
V
4.85
4.80
4.75 1 10 100
VIN = 1.8V VIN = 2.0V
VIN = 2.4V, 2.7V
VIN = 3.0V
I
OUT
VIN = 3.3V
(mA)
LOAD-TRANSIENT RESPONSE
VIN = 1.8V
VIN = 3.3V
VIN = 3.6V
VIN = 2.4V VIN = 2.7V
V
= 3.0V
IN
= 3.6V
VIN = 3.6V
INPUT CURRENT vs. OUTPUT CURRENT
200 180 160
140 120
(mA)
100
IN
I
80
A
60
40 20
0
0
10 20 30 40 50 60 70 80 90 100
D
C
B
(mA)
I
OUT
G
F
E
I
OUT
V
IN
MAX
A
18
1.8
B
36
2.0 41
2.4
C
64
2.7
D E
72
3.0
F
94
3.6
G
100
3.3
1000
(µA)
IN
I
OUTPUT VOLTAGE vs. INPUT VOLTAGE
5.06
(V)
OUT
V
5.04
5.02
5.00
4.98
4.96
4.94
I
= 20mA
OUT
2.01.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
(V)
V
IN
EFFICIENCY (%)
LINE-TRANSIENT RESPONSE (I
NO-LOAD INPUT CURRENT 
vs. INPUT VOLTAGE
SHDN = 0V
100
10
1.0
0.1
0.01
1.5 2.0 2.5 3.0 3.5 4.0 4.5
SHDN = V
(V)
V
IN
IN
EFFICIENCY vs. INPUT VOLTAGE
90
85
80
75
70
65
60
1.5
2.0 2.5 3.0 3.5 4.0
= 20mA)
OUT
I
= 10mA
OUT
V
(V)
IN
MAX619
TOP TRACE: OUTPUT CURRENT, 0mA to 25mA, 10mA/div BOTTOM TRACE: OUTPUT VOLTAGE, 5mV/div, AC-COUPLED
2ms/div
R
= 250Ω, V
LOAD
TOP TRACE: V BOTTOM TRACE: OUTPUT VOLTAGE, 50mV/div, AC-COUPLED
2ms/div
= 5V, I
OUT
OUT
= 2V to 3V, 1V/div
IN
= 20mA
________________________________________________________________________________________
3
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