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MAX608EPA

P1-P3P4-P6P7-P9P10-P12
_______________General Description
The MAX608 low-voltage step-up controller operates
from a 1.8V to 16.5V input voltage range. Pulse-fre-
quency-modulation (PFM) control provides high effi-
ciency at heavy loads, while using only 85µA (typical)
when operating with no load. In addition, a logic-con-
trolled shutdown mode reduces supply current to 2µA
typical. The output voltage is factory-set at 5V or can be
adjusted from 3V to 16.5V with an external resistor
divider.
The MAX608 is ideal for two- and three-cell battery-
powered systems. An operating frequency of up to
300kHz allows use with small surface-mount compo-
nents.
The MAX608 operates in “bootstrapped” mode only
(with the chip supply, OUT, connected to the DC-DC
output). For a 12V output without external resistors, or
for nonbootstrapped applications (chip supply connect-
ed to input voltage), refer to the pin-compatible
MAX1771. The MAX608 is available in 8-pin DIP and
SO packages.
________________________Applications
High-Efficiency DC-DC Converters
Battery-Powered Applications
Positive LCD-Bias Generators
Portable Communicators
____________________________Features
♦ 1.8V to 16.5V Input Range
♦ 85% Efficiency for 30mA to 1.5A Load Currents
♦ Up to 10W Output Power
♦ 110µA Max Supply Current
♦ 5µA Max Shutdown Current
♦ Preset 5V or Adjustable Output (3V to 16.5V)
♦ Current-Limited PFM Control Scheme
♦ Up to 300kHz Switching Frequency
♦ Evaluation Kit Available
MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
CS
GND
AGND
REF
SHDN
FB
OUT
EXT
TOP VIEW
MAX608
DIP/SO
__________________Pin Configuration
FB AGND GND
OUT
CS
EXT
N
REF
SHDN
ON/OFF
OUTPUT
5V
INPUT 
1.8V TO V
OUT
MAX608
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.
19-0438; Rev 0; 9/95
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
* Contact factory for dice specifications.
______________Ordering Information
PART
MAX608C/D
MAX608EPA
MAX608ESA
-40°C to +85°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
Dice*
8 Plastic DIP
-40°C to +85°C 8 SO
Supply Current
MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
OUT to GND.............................................................-0.3V, 17V
EXT, CS, REF, SHDN, FB to GND ...............-0.3V, (V
OUT
+ 0.3V)
GND to AGND.............................................................0.1V, -0.1V
Continuous Power Dissipation (T
A
= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ............727mW
SO (derate 5.88mW/°C above +70°C).........................471mW
Operating Temperature Range ...........................-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
(V
OUT
= 5V, I
LOAD
= 0mA, T
A
= -40°C to +85°C where indicated. T
A
= -25°C to +85°C for all other limits. Typical values are at
T
A
= +25°C.)
PARAMETER
SYMBOL CONDITIONS MIN TYP MAX UNITS
85 110
µA
Output Voltage (Note 3) V
V
IN
= 2.0V to 5.0V,
over full load range,
circuit of Figure 2a
4.825 5.0 5.175
7 mV/V
60 mV/A
Maximum Switch On-Time t
ON
(max) 12 16 20
µs
Minimum Switch Off-Time t
OFF
(min) 1.8 2.3 2.8
µs
%
Reference Voltage
I
REF =
0µA
T
A
= -25°C to +85°C 1.4625 1.5 1.5375
V
T
A
= -40°C to +85°C (Note 1) 1.4475 1.5525
Output Voltage Line
Regulation (Note 4)
Output Voltage Load
Regulation (Note 4)
V
OUT
= 16.5V,
SHDN ≤ 0.4V
Minimum Start-Up Voltage No load 1.6 1.8 V
T
A
= -25°C to +85°C 1.8 16.5
T
A
= -40°C to +85°C (Note 1) 1.9 16.5
Input Voltage Range
(Note 2)
V
Efficiency 87
REF Load Regulation -4 10 mV0µA ≤ I
REF
≤ 100µA
3V ≤ V
OUT
≤ 16.5V 40 100
FB Trip Point Voltage
(Note 5)
V
FB
T
A
= -25°C to +85°C
1.4625 1.5 1.5375
V
T
A
= -40°C to +85°C (Note 1) 1.4475 1.5525
V
OUT
= 1.8V to 16.5V 1.6
µV/V
REF Line Regulation
V
IN
= 4V, V
OUT
= 5V, I
LOAD
= 500mA,
circuit of Figure 2a
V
IN
= 2V, V
OUT
= 5V, I
LOAD
= 0mA to 500mA,
circuit of Figure 2a
V
IN
= 2.7V to 4.0V, V
OUT
= 5V, I
LOAD
= 500mA,
circuit of Figure 2a
T
A
= -25°C to +85°C
T
A
= -25°C to +85°C
120T
A
= -40°C to +85°C (Note 1)
V
OUT
= 10V,
SHDN ≥ 1.6V
25
µA
T
A
= -25°C to +85°C
10T
A
= -40°C to +85°C (Note 1)
T
A
= -40°C to +85°C (Note 1) 4.800 5.0 5.200
V
REF
V
IH
SHDN Input High Voltage
V
V
IL
SHDN Input Low Voltage
V
V
OUT
= 1.8V to 16.5V 0.4
SHDN Input Current I
IN
V
OUT
= 16.5V, SHDN = 0V or 16.5V ±1
µA
FB Input Current I
FB
T
A
= -25°C to +85°C
-4 ±20
nA
T
A
= -40°C to +85°C (Note 1) ±40
MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
_______________________________________________________________________________________
3
0
50
100
150
200
SUPPLY CURRENT
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
01 2345
MAX608-06
60
1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 12V)
70
80
90
100
MAX608-02
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 6.0V
V
IN
= 5.0V
V
IN
= 3.0V
V
IN
= 9.0V
V
IN
= 2.0V
60
1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 3.3V)
70
80
90
100
MAX608-03
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 2.0V
V
IN
= 3.0V
60
1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(V
OUT
= 5V)
70
80
90
100
MAX608-01
LOAD CURRENT (mA)
EFFICIENCY (%)
V
IN
= 4.0V
V
IN
= 3.5V
V
IN
= 3.0V
V
IN
= 2.0V
0
700
600
500
400
300
200
100
LOAD CURRENT vs.
MINIMUM START-UP 
INPUT VOLTAGE
MAX608-04
MINIMUM START-UP VOLTAGE (V)
LOAD CURRENT (mA)
1.8 2.2 2.6 3.0 3.4 3.8 4.0
V
OUT
= 5V
CIRCUIT OF FIGURE 2a
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.7V
0
500
400
300
200
100
LOAD CURRENT vs.
MINIMUM START-UP
INPUT VOLTAGE
MINIMUM START-UP VOLTAGE (V)
LOAD CURRENT (mA)
MAX608-05
V
OUT
= 12V
CIRCUIT OF FIGURE 2b
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.6V
1.8 2.2 2.6 3.0 3.4 3.8 4.0
ELECTRICAL CHARACTERISTICS (continued)
(V
OUT
= 5V, I
LOAD
= 0mA, T
A
= -40°C to +85°C where indicated. T
A
= -25°C to +85°C for all other limits. Typical values are at
T
A
= +25°C.)
PARAMETER
SYMBOL CONDITIONS
MIN TYP MAX
UNITS
Current-Limit Trip Level V
CS
V
OUT
= 3V to 16.5V
85 100 115
mV
CS Input Current I
CS
0.01 ±1
µA
EXT Rise Time V
OUT
= 5V, 1nF from EXT to GND 50
ns
EXT Fall Time V
OUT
= 5V, 1nF from EXT to GND 50
Note 1: Limits over this temperature range are guaranteed by design.
Note 2: The MAX608 must be operated in bootstrapped mode with OUT connected to the DC-DC circuit output. The minimum output
voltage set point is +3V.
Note 3: Output voltage guaranteed using preset voltages. See Figures 4a–4d for output current capability versus input voltage.
Note 4: Output voltage line and load regulation depend on external circuit components.
Note 5: Operation in the external-feedback mode is guaranteed to be accurate to the V
FB
trip level, and does not include resistor tolerance.
80 120
__________________________________________Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
T
A
= -40°C to +85°C (Note 1)
EXT On-Resistance EXT = high or low 15 30 Ω
T
A
= -25°C to +85°C
P1-P3P4-P6P7-P9P10-P12

MAX608EPA

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IC REG CTRLR BOOST 8DIP
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