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General Description
The MAX682/MAX683/MAX684 charge-pump regula-
tors generate 5V from a 2.7V to 5.5V input. They are
specifically designed to serve as high-efficiency auxil-
iary supplies in applications that demand a compact
design. The MAX682, MAX683, and MAX684 deliver
250mA, 100mA, and 50mA output current, respectively.
These complete 5V regulators require only one resistor
and three external capacitors--no inductors are need-
ed. High switching frequencies (externally adjustable
up to 2MHz) and a unique regulation scheme allow the
use of capacitors as small as 1F per 100mA of output
current. The MAX683/MAX684 are offered in a space-
saving 8-pin MAX package that is only 1.1mm high,
while the MAX682 is available in an 8-pin SO.
Applications
Flash Memory Supplies
Battery-Powered Applications
Miniature Equipment
PCMCIA Cards
3.3V to 5V Local Conversion Applications
Backup-Battery Boost Converters
3V to 5V GSM SIMM Cards
Features
o
Ultra-Small: 1F Capacitors per 100mA of Output
Current
o
No Inductors Required
o
1.1mm Height in MAX Package (MAX683/MAX684)
o
Up to 250mA Output Current (MAX682)
o
Regulated 4% Output Voltage
o
50kHz to 2MHz Adjustable Switching Frequency
o
2.7V to 5.5V Input Voltage
o
100A Quiescent Current in Pulse-Skipping Mode
o
0.1A Shutdown Current
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
________________________________________________________________
Maxim Integrated Products
1
CXN
PGND
GND
1
2
8
7
OUT
CXP
SHDN
IN
SKIP
SO
TOP VIEW
3
4
6
5
MAX682
CXN
PGND
GND
1
2
8
7
OUT
CXP
SHDN
IN
SKIP
MAX
3
4
6
5
MAX683
MAX684
Pin Configurations
OUTPUT
5V/250mA
OUT
SHDN
IN
INPUT
2.7V TO 5.5V
SKIP
R
EXT
GND
PGND
CXN
CXP
MAX682
Typical Operating Circuit
19-0177; Rev 1; 8/98
PART
MAX682
ESA
MAX683
EUA
MAX684
EUA
-40C to +85C
-40C to +85C
-40C to +85C
TEMP. RANGE
PIN-PACKAGE
8 SO
8 MAX
8 MAX
Ordering Information
3.0V
IN
3.6V for SKIP = 0,
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
IN
= 3V, V
SKIP
= 0V, C
IN
= 1F, C
X
= 0.47F, C
OUT
= 2F, I
SHDN
= 22A; I
MAX
= 250mA for MAX682, I
MAX
= 100mA for MAX683,
I
MAX
= 50mA for MAX684; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
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.
IN, OUT, SHDN, SKIP to GND.................................-0.3V to +6V
PGND to GND.....................................................................0.3V
CXN to GND ................................................-0.3V to (V
IN
+ 0.3V)
CXP to GND..............................................-0.3V to (V
OUT
+ 0.3V)
Continuous Output Current
MAX682........................................................................300mA
MAX683........................................................................150mA
MAX684..........................................................................75mA
Output Short-Circuit Duration ...............................................5sec
Continuous Power Dissipation (T
A
= +70C)
8-Pin SO (derate 5.9mW/C above +70C).................471mW
8-Pin MAX (derate 4.1mW/C above +70C) ............330mW
Operating Temperature Range
MAX68_E_A ....................................................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +160C
Lead Temperature (soldering, 10sec) .............................+300C
Regulation with V
IN
> 3.6V requires
SKIP = high
R
L
= 5V/I
MAX
(Note 2)
T
A
= +25C
I
SHDN
=4.4A
MAX682
SKIP = 0, V
IN
= 3.6V
SKIP = high, 0
I
LOAD
I
MAX
I
SHDN
= 22A
CONDITIONS
s
50
t
START
Shutdown Exit Time
160
200
250
750
1000
1300
kHz
850
1000
1200
Switching Frequency (Note 2)
mV
100
Input Undervoltage Lockout
Hysteresis
V
2.0
2.35
2.6
V
2.7
5.5
V
IN
Input Voltage Range
Input Undervoltage Lockout
Threshold
A
1
50
I
SHDN
SHDN Input Current Range
mV
630
690
750
V
ON, SHDN
SHDN On Bias Voltage
V
0.35
V
INL, SHDN
SHDN Logic Low Input
mA
250
I
MAX
Maximum Output Current
mA
0.1
0.18
I
Q
No-Load Input Current
%
-3
V
LDR
Load Regulation
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
0C < T
A
< +85C
-40C < T
A
< +85C
0C < T
A
< +85C
150
200
270
-40C < T
A
< +85C
MAX683
100
MAX684
50
7.5
SHDN = 0, V
IN
= 5.5V, V
OUT
= 0
A
0.1
5
I
Q, SHDN
Shutdown Supply Current
0 < I
LOAD
I
MAX
;
3.0V
IN
3.6V for SKIP = 0,
3.0V
IN
5.5V for SKIP = IN
V
4.80
5.05
5.20
V
OUT
Output Voltage
2.5
SKIP = V
IN
= 3.6V
1.7
MAX684
MAX683
MAX682
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3V, V
SKIP
= 0V, C
IN
= 1F, C
X
= 0.47F, C
OUT
= 2F, I
SHDN
= 22A; I
MAX
= 250mA for MAX682, I
MAX
= 100mA for MAX683,
I
MAX
= 50mA for MAX684; T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25C.) (Note 1)
Note 1:
Specifications to -40C are guaranteed by design and not production tested.
Note 2:
Current into SHDN determines oscillator frequency: R
EXT
(k
) = 45000 (V
IN
- 0.69V) / f
OSC
(kHz)
V
IN
= 5.5V, V
SKIP
= 0V or 5.5V
V
IN
= 5.5V
CONDITIONS
A
-1
1
I
SKIP
SKIP Input Leakage Current
2.4
V
INH, SKIP
SKIP Input Voltage High
V
0.8
V
INL, SKIP
SKIP Input Voltage Low
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
__________________________________________Typical Operating Characteristics
(Circuit of Figure 5, V
IN
= 3.3V, component values from Tables 2 and 3, T
A
= +25C, unless otherwise noted.)
0
2
6
MAX682
MAX683
MAX684
4
8
10
2
3
4
5
6
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX682 TOC01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (mA)
SKIP = HIGH
I
SHDN
= 22
A
5.50
4.00
1
10
100
1000
OUTPUT VOLTAGE vs. LOAD CURRENT
(SKIP = LOW)
MAX682 TOC03
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
4.50
5.00
5.25
4.25
4.75
MAX684
MAX683
MAX682
5.50
4.00
1
10
100
1000
OUTPUT VOLTAGE vs. LOAD CURRENT
(SKIP = HIGH)
MAX682 TOC04
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
4.50
5.00
5.25
4.25
4.75
MAX684
MAX683
MAX682
SKIP = HIGH
I
SHDN
= 22
A
3.50
3.75
4.00
4.25
4.50
4.75
5.00
5.25
5.50
2
3
4
5
6
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX682 TOC06
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
SKIP = HIGH
SKIP = LOW
10M
10k
0.1
1
10
100
OSCILLATOR FREQUENCY vs.
SHUTDOWN PIN INPUT CURRENT
MAX682 TOC08
SHDN INPUT CURRENT (
A)
OSCILLATOR FREQUENCY (Hz)
100k
1M
100
0.1
0.1
1
10
100
NO-LOAD SUPPLY CURRENT vs.
SHUTDOWN PIN INPUT CURRENT
MAX682 TOC09
SHDN INPUT CURRENT (
A)
NO-LOAD SUPPLY CURRENT (mA)
1
10
MAX683
MAX682
MAX684
SKIP = HIGH
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
4
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 5, V
IN
= 3.3V, component values from Tables 2 and 3, T
A
= +25C, unless otherwise noted.)
100
0
1
10
100
1000
MAX682 EFFICIENCY
vs. LOAD CURRENT (SKIP = HIGH)
20
10
MAX682 TOC13
LOAD CURRENT (mA)
EFFICIENCY (%)
50
70
60
40
30
80
90
V
IN
= 5.0V
V
IN
= 3.3V
V
IN
= 3.0V
I
SHDN
= 22
A
100
0
1
10
100
1000
MAX683 EFFICIENCY
vs. LOAD CURRENT (SKIP = HIGH)
20
10
MAX682 TOC14
LOAD CURRENT (mA)
EFFICIENCY (%)
50
70
60
40
30
80
90
V
IN
= 5.0V
V
IN
= 3.3V
V
IN
= 3.0V
I
SHDN
= 22
A
90
0
1
10
100
MAX684 EFFICIENCY
vs. LOAD CURRENT (SKIP = HIGH)
20
10
MAX682 TOC15
LOAD CURRENT (mA)
EFFICIENCY (%)
40
30
50
60
70
80
V
IN
= 3.0V
V
IN
= 3.3V
V
IN
= 5.0V
I
SHDN
= 22
A
200ns/div
OUTPUT WAVEFORM
(SKIP = HIGH)
MAX682 TOC16
50mV/div
SKIP = HIGH, I
SHDN
= 22
A, I
LOAD
= 250mA, MAX682
200ns/div
OUTPUT WAVEFORM
(SKIP = LOW)
MAX682 TOC17
50mV/div
SKIP = LOW, I
LOAD
= 250mA, MAX682
100
0
0.1
1
10
100
1000
MAX682 EFFICIENCY
vs. LOAD CURRENT (SKIP = LOW)
20
10
MAX682 TOC10
LOAD CURRENT (mA)
EFFICIENCY (%)
50
70
60
40
30
80
90
V
IN
= 3.6V
V
IN
= 3.3V
V
IN
= 3.0V
100
0
0.1
1
10
100
1000
MAX683 EFFICIENCY
vs. LOAD CURRENT (SKIP = LOW)
20
10
MAX682 TOC11
LOAD CURRENT (mA)
EFFICIENCY (%)
50
70
60
40
30
80
90
V
IN
= 3.6V
V
IN
= 3.3V
V
IN
= 3.0V
100
0
0.1
1
10
100
MAX684 EFFICIENCY
vs. LOAD CURRENT (SKIP = LOW)
20
10
MAX682 TOC12
LOAD CURRENT (mA)
EFFICIENCY (%)
50
70
60
40
30
80
90
V
IN
= 3.6V
V
IN
= 3.3V
V
IN
= 3.0V
MAX682/MAX683/MAX684
3.3V-Input to Regulated 5V-Output
Charge Pumps
_______________________________________________________________________________________
5
2ms/div
LOAD-TRANSIENT RESPONSE
MAX682 TOC19
A
B
A: LOAD CURRENT: I
LOAD
= 5mA TO 250mA, 500mA/div
B: OUTPUT VOLTAGE: SKIP = HIGH, I
SHDN
= 22
A,
100mV/div, MAX682
100
s/div
SHUTDOWN TIMING
MAX682 TOC18
A
B
A: OUTPUT VOLTAGE: SKIP = HIGH, R
L
= 5V / I
MAX
, 2V/div
B: SHDN VOLTAGE: 1V/div
2ms/div
LINE-TRANSIENT RESPONSE
MAX682 TOC20
A
B
A: INPUT VOLTAGE: V
IN
= 3.1V TO 3.6V, 500mV/div
B: OUTPUT VOLTAGE: SKIP = HIGH, I
SHDN
= 22
A,
I
LOAD
= 250mA, 50mV/div, MAX682
Typical Operating Characteristics (continued)
(Circuit of Figure 5, V
IN
= 3.3V, component values from Tables 2 and 3, T
A
= +25C, unless otherwise noted.)
Pin Description
NAME
FUNCTION
1
SKIP
When SKIP = low, the regulator operates in low-quiescent-current skip mode. When SKIP = high, the
regulator operates in constant-frequency mode, minimizing output ripple and noise. SKIP must be tied
high for input voltages above 3.6V.
2
SHDN
Shutdown Input. Drive SHDN through an external resistor. When SHDN = low, the device turns off. When
current is sourced into SHDN through R
EXT
, the device activates, and the SHDN pin input current sets the
oscillator's switching frequency. R
EXT
(k
) = 45000 (V
IN
- 0.69V) / f
OSC
(kHz).
PIN
3
IN
Input Supply Pin. Can range from 2.7V to 5.5V for SKIP = high, and 2.7V to 3.6V for SKIP = low. Bypass to
PGND with a suitable value capacitor (see
Capacitor Selection section).
4
GND
Ground Pin. Connect to PGND through a short trace.
8
OUT
Fixed 5V Power Output. Bypass to PGND with output filter capacitor.
7
CXP
Positive Terminal of the Charge-Pump Transfer Capacitor
6
CXN
Negative Terminal of the Charge-Pump Transfer Capacitor
5
PGND
Power Ground Pin
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