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MAX608ESA+ |MAX608ESAMAXIMN/a95avai5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller
MAX608ESA-T |MAX608ESATMAXIMN/a308avai5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller


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MAX608ESA+-MAX608ESA-T
5V or Adjustable, Low-Voltage, Step-Up DC-DC Controller
_______________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 Range85% Efficiency for 30mA to 1.5A Load CurrentsUp to 10W Output Power110μA Max Supply Current5μA Max Shutdown CurrentPreset 5V or Adjustable Output (3V to 16.5V)Current-Limited PFM Control SchemeUp to 300kHz Switching FrequencyEvaluation Kit AvailableV or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
________________________________________________________________Maxim Integrated Products1

GND
AGND
REFSHDN
OUT
EXT
TOP VIEW
MAX608
DIP/SO
__________________Pin Configuration
AGNDGNDOUT
EXTN
REF
SHDNON/OFF
OUTPUT
INPUT
1.8V TO VOUT

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. RANGEPIN-PACKAGE

Dice*
8 Plastic DIP
-40°C to +85°C8 SO
Supply CurrentV or Adjustable, Low-Voltage, ep-Up DC-DC Controller_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS

Supply Voltage
OUT to GND.............................................................-0.3V, 17V
EXT, CS, REF, SHDN, FB to GND...............-0.3V, (VOUT+ 0.3V)
GND to AGND.............................................................0.1V, -0.1V
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
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

(VOUT= 5V, ILOAD= 0mA, TA= -40°C to +85°C where indicated. TA= -25°C to +85°C for all other limits. Typical values are at = +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
110mA
Output Voltage (Note 3)V
VIN= 2.0V to 5.0V,
over full load range,
circuit of Figure 2a
4.8255.05.175mV/VmV/A
Maximum Switch On-TimetON(max)121620ms
Minimum Switch Off-TimetOFF(min)1.82.32.8ms
Reference VoltageIREF = 0mATA= -25°C to +85°C1.46251.51.5375VTA= -40°C to +85°C (Note 1)1.44751.5525
Output Voltage Line
Regulation (Note 4)
Output Voltage Load
Regulation (Note 4)
VOUT= 16.5V,
SHDN ≤0.4V
Minimum Start-Up VoltageNo load1.61.8V= -25°C to +85°C1.816.5= -40°C to +85°C (Note 1)1.916.5
Input Voltage Range
(Note 2)V
Efficiency87
REF Load Regulation-410mV0μA ≤IREF≤100μA
3V ≤VOUT ≤16.5V40100
FB Trip Point Voltage
(Note 5)VFBTA= -25°C to +85°C1.46251.51.5375VTA= -40°C to +85°C (Note 1)1.44751.5525
VOUT= 1.8V to 16.5V1.6V/VREF Line Regulation
VIN= 4V, VOUT= 5V, ILOAD=500mA,
circuit of Figure 2a
VIN= 2V, VOUT= 5V, ILOAD= 0mA to 500mA,
circuit of Figure 2a
VIN= 2.7V to 4.0V, VOUT= 5V, ILOAD= 500mA,
circuit of Figure 2a= -25°C to +85°C= -25°C to +85°C
120TA= -40°C to +85°C (Note 1)
VOUT= 10V,
SHDN ‡1.6V5mATA= -25°C to +85°CTA= -40°C to +85°C (Note 1)= -40°C to +85°C (Note 1)4.8005.05.200
VREF
VIHSHDN Input High VoltageV
VILSHDN Input Low VoltageVVOUT= 1.8V to 16.5V0.4
SHDN Input CurrentIINVOUT= 16.5V, SHDN = 0V or 16.5V±1mA
FB Input CurrentIFBTA= -25°C to +85°C-4±20nATA= -40°C to +85°C (Note 1)±40
V or Adjustable, Low-Voltage, Step-Up DC-DC Controller
_______________________________________________________________________________________3

SUPPLY CURRENT
vs. INPUT VOLTAGE
INPUT VOLTAGE (V)
(m12345
MAX608-06101001000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 12V)

MAX608-02
LOAD CURRENT (mA)
FIC
IEN
(%
VIN = 6.0VVIN = 5.0V
VIN = 3.0V
VIN = 9.0V
VIN = 2.0V101001000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)

MAX608-03
LOAD CURRENT (mA)
FIC
IEN
(%
VIN = 2.0V
VIN = 3.0V101001000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5V)

MAX608-01
LOAD CURRENT (mA)
FIC
IEN
(%
VIN = 4.0V
VIN = 3.5V
VIN = 3.0V
VIN = 2.0V
LOAD CURRENT vs.
MINIMUM START-UP
INPUT VOLTAGE
MAX608-04
MINIMUM START-UP VOLTAGE (V)
T (m
VOUT = 5V
CIRCUIT OF FIGURE 2a
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.7V
LOAD CURRENT vs.
MINIMUM START-UP
INPUT VOLTAGE
MINIMUM START-UP VOLTAGE (V)
(m
MAX608-05
VOUT = 12V
CIRCUIT OF FIGURE 2b
EXTERNAL FET THRESHOLD LIMITS
FULL-LOAD START-UP BELOW 3.6V
ELECTRICAL CHARACTERISTICS (continued)
(VOUT= 5V, ILOAD= 0mA, TA= -40°C to +85°C where indicated. TA= -25°C to +85°C for all other limits. Typical values are at = +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS

Current-Limit Trip LevelVCSVOUT= 3V to 16.5V85100115mV
CS Input CurrentICS0.01±1mA
EXT Rise TimeVOUT= 5V, 1nF from EXT to GND50nsEXT Fall TimeVOUT= 5V, 1nF from EXT to GND50
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
FBtrip level, and does not include resistor tolerance.120
__________________________________________Typical Operating Characteristics

(TA = +25°C, unless otherwise noted.)= -40°C to +85°C (Note 1)
EXT On-ResistanceEXT = high or low1530Ω= -25°C to +85°C
V or Adjustable, Low-Voltage, ep-Up DC-DC Controller___________________________________________________________________________________________________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
EXT RISE/FALL TIME vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
/FA
TIM
(nsCEXT = 2200pF
CEXT = 1000pF
CEXT = 470pF
CEXT = 100pF
MAX608-07
REFERENCE OUTPUT RESISTANCE vs.TEMPERATURE
AX608-08
TEMPERATURE (°C)
(W100
100µA
50µA
10µA1.502
-60-2060140REFERENCE vs. TEMPERATURE
AX608-09
TEMPERATURE (°C)
(V100-4008040120
VIN = 3V, IOUT = 490mA, VOUT = 5V
A = EXT VOLTAGE, 5V/div
B = INDUCTOR CURRENT, 1A/div
C = VOUT RIPPLE, 50mV/div, AC-COUPLED
MEDIUM-LOAD SWITCHING WAVEFORMS
(VOUT = 5V)

VOUT
ILIM
20ms/div
SHUTDOWN CURRENT vs. TEMPERATURE
MAX608-11
TEMPERATURE (°C)
(µ100-4008040120
V+ = 15V
V+ = 4V
V+ = 8V
MINIMUM SWITCH OFF-TIME vs.TEMPERATURE
TEMPERATURE (°C)
in) (µs
AX608-12
MAXIMUM SWITCH ON-TIME vs.TEMPERATURE
TEMPERATURE (°C)
x) (µ
AX608-10
VIN = 3V, IOUT = 930mA, VOUT = 5V
A = EXT VOLTAGE, 5V/div
B = INDUCTOR CURRENT, 1A/div
C = VOUT RIPPLE, 50mV/div, AC-COUPLED
HEAVY-LOAD SWITCHING WAVEFORMS
(VOUT = 5V)

VOUT
ILIMs/div
V or Adjustable, Low-Voltage, Step-Up DC-DC Controller
_______________________________________________________________________________________5
____________________________Typical Operating Characteristics (continued)

(TA = +25°C, unless otherwise noted.)
VIN = 4V, IOUT = 490mA, VOUT = 12V
A = EXT VOLTAGE, 10V/div
B = INDUCTOR CURRENT, 1A/div
C = VOUT RIPPLE, 50mV/div, AC-COUPLED
HEAVY-LOAD SWITCHING WAVEFORMS
(VOUT = 12V)

VOUT
ILIMs/div
VIN = 4V, IOUT = 300mA, VOUT = 12V
A = EXT VOLTAGE, 10V/div
B = INDUCTOR CURRENT, 1A/div
C = VOUT RIPPLE, 50mV/div, AC-COUPLED
MEDIUM-LOAD SWITCHING WAVEFORMS
(VOUT = 12V)

VOUT
ILIM
10ms/div
VIN = 2V, VOUT = 5V
A = LOAD CURRENT, 0mA TO 500mA, 500mA/div
B = VOUT RIPPLE, 50mV/div, AC-COUPLED
LOAD-TRANSIENT RESPONSE
(VOUT = 5V)

500mA
2ms/div
IOUT = 500mA, VOUT = 5V
A = VIN, 2.7V TO 4.0V, 1V/div
B = VOUT RIPPLE, 100mV/div, AC-COUPLED
LINE-TRANSIENT RESPONSE
(VOUT = 5V)

4.0V
2.7V
5ms/div
IOUT = 500mA, VIN = 3.5V
A = SHDN, 2V/div
B = VOUT, 2V/div
EXITING SHUTDOWN

200ms/div
V or Adjustable, Low-Voltage, ep-Up DC-DC Controller_____________________________________________________________________________________________________________________________________________________Pin Description
PINNAMEFUNCTION
EXTGate Drive for External N-Channel Power TransistorOUTFBSHDNREFAGNDAnalog GroundGNDHigh-Current Ground Return for the Output DriverCS
Power-Supply and Voltage-Sense Input. Always connect OUT to circuit output.
Feedback Input for Adjustable-Output Operation. Connect to ground for fixed-output operation.
Use a resistor divider network to adjust the output voltage. See Setting the Output Voltagesection.
Active-High TTL/CMOS Logic-Level Shutdown Input. In shutdown mode, VOUTis a diode drop
below the input voltage (due to the DC path from the input voltage to the output). Connect to
ground for normal operation.
1.5V Reference Output that can source 100mA for external loads. Bypass to GND with 0.1mF.
The reference is disabled in shutdown.
Positive Input to the Current-Sense Amplifier. Connect the current-sense resistor between CS
and AGND.
1.5V
REFERENCETRIGS
F/FTRIG
LOW-VOLTAGE
OSCILLATOR
2.5V
0.1V
MAX ON-TIME
ONE-SHOT
MIN OFF-TIME
ONE-SHOT
CURRENT-SENSE
AMPLIFIER
DUAL-MODE
COMPARATORREF
50mV
ERROR
COMPARATOR
SHDN
OUT
LOW-VOLTAGE
START-UP
COMPARATOR
EXT
BIAS
CIRCUITRY
MAX608
2.3ms
16ms
Figure 1. Functional Diagram
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