19-0374; Rev 1; 5/96
KIT
ATION
EVALU
LE
B
AVAILA
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
____________________________Features
o
0.8V to 6.0V Input Supply Voltage
o
0.9V Guaranteed Start-Up Supply Voltage
o
>80% Efficiency Over Wide Load Range
o
100µA No-Load Battery Current (V
OUT
= 3.3V)
o
1µA Shutdown Mode
o
Up to 250kHz Switching Frequency
o
±1.5% Reference Tolerance
o
Low-Battery Detector (LBI/LBO)
o
Available in Ultra-Small 8-Pin µMAX Package
(1.11mm high)
o
Circuit Fits in 0.2in
2
_______________General Description
The MAX866 and MAX867 are ultra-small, high-efficiency,
CMOS, step-up, DC-DC switching regulators for 1-cell
battery-powered systems. The MAX866 accepts a posi-
tive input voltage between 0.8V and V
OUT
and converts it
to a higher, pin-selectable output voltage of 3.3V or 5V.
The MAX867 adjustable version accepts 0.8V to 6.0V
input voltages and generates a higher adjustable output
voltage in the 2.7V to 6.0V range. Typical efficiencies are
greater than 80%. Typical no-load supply current is
100µA (1µA in shutdown).
The MAX866/MAX867 combine ultra-low quiescent sup-
ply current and high efficiency to give maximum battery
life. Its high switching frequency permits the use of
small, low-cost inductors and capacitors. Additionally,
internal peak-current limiting protects the IC.
MAX866/MAX867
______________Ordering Information
________________________Applications
Pagers
Remote Controls
Detectors
1-Cell Battery-Operated Equipment
Backup Supplies
PART
MAX866C/D
MAX866ESA
MAX866EUA
MAX867C/D
MAX867ESA
MAX867EUA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
Dice*
8 SO
8 µMAX
Dice*
8 SO
8 µMAX
* Dice are tested at T
A
= +25°C only.
__________Typical Operating Circuit
INPUT
0.8V TO V
OUT
_________________Pin Configurations
TOP VIEW
SHDN
3/5
1
2
8
7
LX
GND
OUT
LBI
330µH
OUTPUT
5V OR 3.3V
ON/OFF
SHDN
LX
MBRS0520LTI
OR 1N5817
47µF
REF
3
LBO
4
MAX866
6
5
SO/µMAX
MAX866
3V/5V SELECT
LOW-BATTERY
DETECTOR
INPUT
3/5
LBI
REF
0.22µF
LBO
LOW-BATTERY
DETECTOR OUTPUT
OUT
SHDN
FB
1
2
8
7
LX
GND
OUT
LBI
REF
3
LBO
4
MAX867
6
5
GND
SO/µMAX
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
MAX866/MAX867
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (OUT to GND) ...................................-0.3V, +7V
Switch Voltage (LX to GND) .......................................-0.3V, +7V
— —
— –
SHDN , LBO to GND ....................................................-0.3V, +7V
–
–
LBI, REF, 3/ 5, FB to GND ............................-0.3V, (V
OUT
+ 0.3V)
Reference Current (I
REF
) ..................................................2.5mA
Continuous Power Dissipation (T
A
= +70°C)
SO (derate 5.88mW/°C above +70°C) .........................471mW
µMAX (derate 4.1mW/°C above +70°C) ......................330mW
Reverse Battery Current (T
A
≤
+45°C) (Note 1)................750mA
Operating Temperature Ranges
MAX86_C/D .......................................................0°C to +70°C
MAX86_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
Note 1:
Reverse battery current is measured from the
Typical Operating Circuit’s
battery input terminal to GND when the battery is
connected backwards. A reverse current of 750mA will not exceed the package dissipation limits but, if left for an extended
time (more than ten minutes), may degrade performance.
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
(Circuit of Figure 2, V
IN
= 1.2V, I
LOAD
= 0mA, T
A
= +25°C, unless otherwise noted.)
PARAMETER
Minimum Start-Up
Supply Voltage
0.9V
≤
V
IN
≤
3V
–
–
MAX866, 3/ 5 = 0V, 0mA
≤
I
LOAD
≤
6mA
–
–
MAX866, 3/ 5 = 3V, 0mA
≤
I
LOAD
≤
8mA
4.80
3.17
4.80
4.75
3.13
4.75
4.80
3.17
4.80
6
8
6
10
15
10
CONDITIONS
MIN
TYP
0.8
5.0
3.3
5.0
5.0
3.3
5.0
5.0
3.3
5.0
9
13
9
15
23
15
27
100
1
500
No REF load
–
–
3/ 5 = 3V, -20µA
≤
REF load
≤
250µA, C
REF
= 0.22µF
With falling edge
1.22
1.25
0.8
1.22
1.25
1.28
2.0
1.28
60
µA
µA
µA
mA
V
%
V
mA
MAX
0.9
5.20
3.43
5.20
5.25
3.47
5.25
5.20
3.43
5.20
V
UNITS
V
Output Voltage
(Note 2)
MAX867, V
OUT
= 5V, 0mA
≤
I
LOAD
≤
6mA
–
–
MAX866, 3/ 5 = 0V, 0mA
≤
I
LOAD
≤
6mA
0.9V
≤
V
IN
≤
3V,
–
–
T
A =
T
MIN TO
T
MAX
MAX866, 3/ 5 = 3V, 0mA
≤
I
LOAD
≤
8mA
(Note 3)
MAX867, V
= 5V, 0mA
≤
I
≤
6mA
OUT
LOAD
1.2V
≤
V
IN
≤
3V
–
–
MAX866, 3/ 5 = 0V, 0mA
≤
I
LOAD
≤
10mA
–
–
MAX866, 3/ 5 = 3V, 0mA
≤
I
LOAD
≤
15mA
MAX867, V
OUT
= 5V, 0mA
≤
I
LOAD
≤
10mA
–
–
MAX866, 3/ 5 = 0V, 4.8V
≤
V
LOAD
≤
5.2V
–
–
MAX866, 3/ 5 = 3V, 3.17V
≤
V
LOAD
≤
3.43V
MAX867, V
OUT
= 5V, 4.8V
≤
V
LOAD
≤
5.2V
–
–
MAX866, 3/ 5 = 0V, 4.8V
≤
V
LOAD
≤
5.2V
–
–
MAX866, 3/ 5 = 3V, 3.17V
≤
V
LOAD
≤
3.43V
0.9V
≤
V
IN
≤
3V
Maximum Load Current
(Note 2)
1.2V
≤
V
IN
≤
3V
Quiescent Supply Current in
3.3V mode (Note 4)
No-Load Battery Current
Shutdown Quiescent Current
(Note 4)
Peak Inductor Current Limit
Reference Voltage
Reference Load Regulation
LBI Input Threshold
2
MAX867, V
OUT
= 5V, 4.8V
≤
V
LOAD
≤
5.2V
–
–
I
LOAD
= 0mA, 3/ 5 = 3V, LBI = 1.5V,
V
OUT
= 3.47V, FB = 1.5V
Output set for 3.3V, measured at V
IN
in Figure 2, V
IN
= 1.5V
— —
— –
–
–
SHDN = 0V, 3/ 5 = 3V, LBI = 1.5V, V
OUT
= 3.47V,
FB = 1.5V
_______________________________________________________________________________________
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 2, V
IN
= 1.2V, I
LOAD
= 0mA, T
A
= +25°C, unless otherwise noted.)
PARAMETER
LBI Input Hysteresis
LBO Output Voltage Low
LBO Output Leakage Current
–— – –
— —
–
SHDN , 3/ 5 Input Voltage Low
— —
— – –
–
SHDN , 3/ 5 Input Voltage High
— —
— – –
–
SHDN , 3/ 5, FB, LBI Input Current
FB Voltage
Output Voltage Range
I
SINK
= 2mA, open-drain output
LBO = 5V
0.32 x V
OUT
–— –
— —
–
–
LBI = 1.5V, FB = 1.5V, SHDN = 0V or 3V, 3/ 5 = 0V or 3V
MAX867, output in regulation
MAX867
1.22
2.7
±40
1.25
±100
1.28
6.0
CONDITIONS
MIN
TYP
25
0.4
1
0.08 x V
OUT
MAX
UNITS
mV
V
µA
V
V
nA
V
V
MAX866/MAX867
Note 2:
Output current specified with circuit of Figure 2 and CoilCraft D01608-334 inductor for test purposes only. More (or less)
output current can be supplied with other coil types depending on inductance value and coil resistance. See
Typical Operating
Characteristics
for other coil types. Output voltage and output current are guaranteed over this V
IN
operating range once the
device has started up. Actual V
IN
start-up voltage depends on load current.
Note 3:
Output voltage specifications over temperature are guaranteed by design to limits that are 6 sigma from either side of the mean.
Note 4:
Current measured into OUT. V
OUT
is forced to 3.47V to maintain LX off when measuring device current.
__________________________________________Typical Operating Characteristics
(Circuits of Figure 2, T
A
= +25°C, unless otherwise noted.)
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 3.3V)
MAX866/667-01
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 3.3V)
MAX866/67-02
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 5.0V)
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
V
IN
= 0.5V
0.01
0.1
1
10
100
1000
L = SUMIDA CD73-331 (330µH, 1.5Ω)
MAX866/667-03
MAX866/67-06
100
90
80
EFFICIENCY (%)
L = SUMIDA CD73-331 (330µH, 1.5Ω)
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
L = COILCRAFT D01608-334 (330µH, 2.9Ω)
100
70
60
50
40
30
20
10
0
0.01
0.1
1
10
100
1000
LOAD CURRENT (mA)
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
V
IN
= 0.5V
0.01
0.1
1
10
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT (V
OUT
= 5.0V)
MAX866/67-04
NO-LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE (V
OUT
= 3.3V)
DECREASING
BATTERY
VOLTAGE
MAX866/67-05
NO-LOAD BATTERY CURRENT
vs. BATTERY VOLTAGE (V
OUT
= 5V)
4000
3500
BATTERY CURRENT (µA)
3000
2500
2000
1500
1000
500
0
INCREASING
BATTERY
VOLTAGE
DECREASING
BATTERY
VOLTAGE
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0.01
0.1
1
10
TOP TO BOTTOM:
V
IN
= 2.0V
V
IN
= 1.5V
V
IN
= 1.25V
V
IN
= 1.0V
V
IN
= 0.75V
L = COILCRAFT D01608-334 (330µH, 2.9Ω)
1200
1000
800
600
400
200
0
INCREASING
BATTERY
VOLTAGE
100
BATTERY CURRENT (µA)
0
0.2
0.4
0.6
0.8 1.0 1.2
1.4 1.6
0
0.2
0.4
0.6
0.8 1.0 1.2
1.4 1.6
LOAD CURRENT (mA)
BATTERY VOLTAGE (V)
BATTERY VOLTAGE (V)
_______________________________________________________________________________________
3
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
MAX866/MAX867
____________________________Typical Operating Characteristics (continued)
(Circuits of Figure 2, T
A
= +25°C, unless otherwise noted.)
START-UP INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 3.3V)
MAX186-14AMAX866/67-07
START-UP INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 5V)
MAX866/67-08
MAX186-14A
INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 3.3V)
100µH
2.5
INPUT VOLTAGE (V)
2.0
1.5
22µH
1.0
0.5
0
1mH
330µH
47µH
MAX186-14AMAX866/67-09
1.5
1.4
START-UP INPUT VOLTAGE (V)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.1
1
10
1mH
220µH
330µH
100µH
47µH
1.5
1.4
START-UP INPUT VOLTAGE (V)
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
330µH
100µH
220µH
47µH
3.0
100
0.1
1
10
100
1
10
100
1000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
INPUT VOLTAGE vs. LOAD CURRENT
(V
OUT
= 5V)
MAX186-14AMAX866/67-10
REFERENCE VOLTAGE
vs. REFERENCE CURRENT
9
V
REF
LOAD REGULATION (mV)
8
7
6
5
4
3
2
1
MAX866/67-11
3.0
2.5
INPUT VOLTAGE (V)
2.0
1.5
1.0
0.5
0
1
10
100
22µH
100µH
10
330µH
47µH
0
1000
0
LOAD CURRENT (mA)
100
200
50
150
REFERENCE LOAD CURRENT (µA)
250
MAX866 LINE-TRANSIENT RESPONSE
(3.3V MODE)
MAX866 LINE-TRANSIENT RESPONSE
(5V MODE)
A
A
B
B
1ms/div
A: 3.3V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: INPUT VOLTAGE (0.9V AND 1.4V) 500mV/div
I
LOAD
= 10mA, C
OUT
= 47µF
1ms/div
A: 5.0V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: INPUT VOLTAGE (0.9V AND 1.4V) 500mV/div
I
LOAD
= 10mA, C
OUT
= 47µF
4
_______________________________________________________________________________________
3.3V/5V or Adjustable-Output,
Single-Cell DC-DC Converters
____________________________Typical Operating Characteristics (continued)
(Circuits of Figure 2, T
A
= +25°C, unless otherwise noted.)
MAX866 LOAD-TRANSIENT RESPONSE
(3.3V MODE)
MAX866 LOAD-TRANSIENT RESPONSE
(5V MODE)
MAX866/MAX867
A
A
B
B
1ms/div
A: 3.3V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div
(TEKTRONIX P6042 CURRENT PROBE)
I
LOAD
= 5mA, C
OUT
= 47µF, V
IN
= 1.25V
1ms/div
A: 5.0V OUTPUT VOLTAGE, AC COUPLED 20mV/div
B: OUTPUT CURRENT (0mA AND 10mA) 5mV/div
(TEKTRONIX P6042 CURRENT PROBE)
I
LOAD
= 5mA, C
OUT
= 47µF, V
IN
= 1.25V
MAX866 SHUTDOWN RESPONSE
(3.3V MODE)
MAX866 SHUTDOWN RESPONSE
(5V MODE)
A
A
B
B
10ms/div
A: 3.3V OUTPUT VOLTAGE, 2V/div
B: SHDN INPUT VOLTAGE (0V AND 5V) 2V/div
I
LOAD
= 10mA
10ms/div
A: 5.0V OUTPUT VOLTAGE, 2V/div
B: SHDN INPUT VOLTAGE (0V AND 5V) 5V/div
I
LOAD
= 10mA
MAX867 LBI AND FB THRESHOLD
vs. TEMPERATURE
MAX866/67-24
MAX866 OUTPUT VOLTAGE ERROR
vs. TEMPERATURE
MAX866/67-25
START-UP VOLTAGE
vs. TEMPERATURE
I
LOAD
= 0A
START-UP VOLTAGE (V)
0.9
MAX866/67-26
1.260
0.5
OUTPUT VOLTAGE ERROR (%)
3.3V MODE
1.0
LBI, FB VOLTAGE (V)
LBI
0.8
1.250
0
5V MODE
0.7
0.6
I
LOAD
= OA
-0.5
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
0.5
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
VFB (MAX867)
1.240
-60 -40 -20 0 20 40 60
TEMPERATURE (°C)
80 100
80 100
_______________________________________________________________________________________
5
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