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19-0177; Rev 1; 8/98
3.3V-Input to Regulated 5V-Output
Charge Pumps
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 1µF per 100mA of output
current. The MAX683/MAX684 are offered in a space-
saving 8-pin µMAX package that is only 1.1mm high,
while the MAX682 is available in an 8-pin SO.
Features
©
Ultra-Small: 1µF Capacitors per 100mA of Output
Current
©
No Inductors Required
©
1.1mm Height in µMAX Package (MAX683/MAX684)
©
Up to 250mA Output Current (MAX682)
©
Regulated ±4% Output Voltage
©
50kHz to 2MHz Adjustable Switching Frequency
©
2.7V to 5.5V Input Voltage
©
100µA Quiescent Current in Pulse-Skipping Mode
©
0.1µA Shutdown Current
Applications
Ordering Information
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
PART
MAX682
ESA
MAX683
EUA
MAX684
EUA
TEMP. RANGE
PIN-PACKAGE
8 SO
8 µMAX
8 µMAX
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Typical Operating Circuit
Pin Configurations
TOP VIEW
CXN
CXP
SKIP
1
8
OUT
SKIP
1
8
OUT
MAX682
INPUT
2.7V TO 5.5V
OUTPUT
5V/250mA
SHDN
2
7
CXP
SHDN
2
7
CXP
IN
OUT
MAX682
MAX683
MAX684
IN
3
6
CXN
IN
3
6
CXN
SKIP
R
EXT
GND
4
5
PGND
GND
4
5
PGND
SHDN
GND
PGND
SO
m
MAX
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
3.3V-Input to Regulated 5V-Output
Charge Pumps
ABSOLUTE MAXIMUM RATINGS
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C).................471mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ............330mW
Operating Temperature Range
MAX68_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
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
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
IN
= 3V, V
SKIP
= 0V, C
IN
= 1µF, C
X
= 0.47µF, C
OUT
= 2µF, I
SHDN
= 22µA; 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
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Regulation with V
IN
> 3.6V requires
SKIP = high
Input Voltage Range
V
IN
2.7
5.5
V
Input Undervoltage Lockout
Threshold
2.0
2.35
2.6
V
Input Undervoltage Lockout
Hysteresis
100
mV
0 < I
LOAD
²
I
MAX
;
3.0V
²
IN
²
3.6V for
SKIP = 0,
3.0V
IN
3.6V for SKIP = 0,
Output Voltage
V
OUT
²
²
4.80
5.05
5.20
V
3.0V
²
IN
²
5.5V for SKIP = IN
MAX682
250
Maximum Output Current
I
MAX
MAX683
100
mA
MAX684
50
SKIP = 0, V
IN
= 3.6V
0.1
0.18
MAX682
7.5
No-Load Input Current
I
Q
mA
MAX683
2.5
SKIP = V
IN
= 3.6V
MAX684
1.7
Load Regulation
Æ
V
LDR
SKIP = high, 0
²
I
LOAD
²
I
MAX
-3
%
SHDN Logic Low Input
V
INL, SHDN
0.35
V
V
ON, SHDN
T
A
= +25°C
630
690
750
mV
SHDN On Bias Voltage
SHDN Input Current Range
I
SHDN
(Note 2)
1
50
µA
0°C < T
A
< +85°C
-40°C < T
A
< +85°C
0°C < T
A
< +85°C
850
1000
1200
I
SHDN
= 22µA
750
1000
1300
Switching Frequency (Note 2)
kHz
160
200
250
I
SHDN
=4.4µA
-40°C < T
A
< +85°C
150
200
270
Shutdown Supply Current
I
Q, SHDN
0.1
5
µA
SHDN = 0, V
IN
= 5.5V, V
OUT
= 0
Shutdown Exit Time
t
START
R
L
= 5V/I
MAX
50
µs
2
_______________________________________________________________________________________
3.3V-Input to Regulated 5V-Output
Charge Pumps
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 3V, V
SKIP
= 0V, C
IN
= 1µF, C
X
= 0.47µF, C
OUT
= 2µF, I
SHDN
= 22µA; 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
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SKIP Input Voltage Low
V
INL, SKIP
0.8
V
SKIP Input Voltage High
V
INH, SKIP
V
IN
= 5.5V
2.4
SKIP Input Leakage Current
I
SKIP
V
IN
= 5.5V, V
SKIP
= 0V or 5.5V
-1
1
µA
Note 1:
Specifications to -40°C are guaranteed by design and not production tested.
Note 2:
Current into SHDN determines oscillator frequency: R
EXT
(k
½
) = 45000 (V
IN
- 0.69V) / f
OSC
(kHz)
__________________________________________Typical Operating Characteristics
(Circuit of Figure 5, V
IN
= 3.3V, component values from Tables 2 and 3, T
A
= +25°C, unless otherwise noted.)
NO-LOAD SUPPLY CURRENT
vs. SUPPLY VOLTAGE
OUTPUT VOL
TAGE
vs. LOAD CURRENT
(SKIP = LOW)
OUTPUT VOL
TAGE
vs. LOAD CURRENT
(SKIP = HIGH)
5.50
5.50
10
SKIP
= HIGH
I
SHDN
= 22
SKIP
= HIGH
I
SHDN
= 22
m
A
m
A
5.25
5.25
8
5.00
5.00
MAX682
MAX684
6
MAX684
MAX682
4.75
4.75
MAX683
MAX683
4
4.50
4.50
MAX682
MAX683
2
4.25
4.25
MAX684
0
4.00
4.00
2
3
4
5
6
1
10
100
1000
1
10
100
1000
SUPPLY VOLTAGE (V)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OSCILLA
T
OR
F
REQUENCY vs.
SHUTDOWN PIN INPUT CURRENT
NO-LOAD
S
UPP
L
Y CURRENT vs.
SHUTDOWN PIN INPUT CURRENT
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
100
5.50
10M
SKIP = HIGH
SKIP = LOW
5.25
MAX682
5.00
1M
10
MAX683
4.75
4.50
SKIP = HIGH
4.25
1
100k
4.00
3.75
MAX684
10k
0.1
3.50
0.1
1
10
100
2
3
4
5
6
0.1
1
10
100
SHDN INPUT CURRENT (
m
A)
SUPPLY VOLTAGE (V)
SHDN INPUT CURRENT (
m
A)
_______________________________________________________________________________________
3
3.3V-Input to Regulated 5V-Output
Charge Pumps
Typical Operating Characteristics (continued)
(Circuit of Figure 5, V
IN
= 3.3V, component values from Tables 2 and 3, T
A
= +25°C, unless otherwise noted.)
MAX682 EFFIC
IENC
Y
vs. LOAD CURRENT (SKIP = LOW)
MAX683 EFFIC
IENC
Y
vs. LOAD CURRENT (SKIP = LOW)
MAX684 EFFI
CIEN
CY
vs. LOAD CURRENT (SKIP = LOW)
100
100
100
V
IN
= 3.0V
V
IN
= 3.0V
V
IN
= 3.0V
90
90
90
80
80
80
70
60
70
60
70
60
V
IN
= 3.3V
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 3.6V
50
50
50
40
30
40
30
40
30
20
10
20
10
20
10
0
0
0
0.1
1
10
100
1000
0.1
1
10
100
1000
0.1
1
10
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAX682 EFFI
CIEN
CY
vs. LOAD CURRENT (SKIP = HIGH)
MAX683 EFFIC
IENC
Y
vs. LOAD CURRENT (SKIP = HIGH)
MAX684 EFFIC
IENC
Y
vs. LOAD CURRENT (SKIP = HIGH)
100
100
90
V
IN
= 3.0V
90
90
V
IN
= 3.0V
80
80
80
V
IN
= 3.0V
70
70
60
70
60
60
V
IN
= 3.3V
V
IN
=
3
.3V
50
V
IN
=
3.3V
50
50
40
30
V
IN
= 5.0V
40
30
40
30
V
IN
= 5.0V
V
IN
= 5.0V
20
10
20
10
20
10
I
SHDN
= 22
m
A
I
SHDN
= 22
m
A
I
SHDN
= 22
m
A
0
0
0
1
10
100
1000
1
10
100
1000
1
10
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUT
PUT
WAVEFORM
(SKIP = HIGH)
OUT
PUT
WAVEFORM
(SKIP = LOW)
MAX682 TOC16
MAX682 TOC17
50mV/div
50mV/div
200ns/div
200ns/div
SKIP = HIGH, I
SHDN
= 22
m
A, I
LOAD
= 250mA, MAX682
SKIP = LOW, I
LOAD
= 250mA, MAX682
4
_______________________________________________________________________________________
3.3V-Input to Regulated 5V-Output
Charge Pumps
Typical Operating Characteristics (continued)
(Circuit of Figure 5, V
IN
= 3.3V, component values from Tables 2 and 3, T
A
= +25°C, unless otherwise noted.)
SHUTDOWN TIMING
LINE-TRANSIENT RESPONSE
MAX682 TOC20
LOAD-TRANSIENT RESPONS
MAX682 TOC19
MAX682 TOC18
A
A
A
B
B
B
100
m
s/div
2ms/div
2ms/div
A:
OUTP
UT VOLTAGE: SKIP = HIGH, R
L
= 5V / I
MAX
, 2V/div
B: SHDN VOLTAGE: 1V/div
A: INPUT VOLTAGE: V
I
N
= 3
.1V TO 3.
6V, 50
0mV/div
B: OUTPUT VOLTAGE: SKIP = HIGH, I
SHDN
= 22
A: LOAD CURRENT: I
L
OAD
=
5mA TO
250m
A, 500mA/div
B: OUTPUT VOLTAGE: SKIP = HIGH, I
SHDN
= 22
m
A,
100mV/div, MAX682
m
A,
I
LOAD
= 250mA, 50mV/div, MAX682
Pin Description
PIN
NAME
FUNCTION
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.
1
SKIP
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
½
) = 45000 (V
IN
- 0.69V) / f
OSC
(kHz).
2
SHDN
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 Selectionsection).
3
IN
4
GND
Ground Pin. Connect to PGND through a short trace.
5
PGND
Power Ground Pin
6
CXN
Negative Terminal of the Charge-Pump Transfer Capacitor
7
CXP
Positive Terminal of the Charge-Pump Transfer Capacitor
8
OUT
Fixed 5V Power Output. Bypass to PGND with output filter capacitor.
_______________________________________________________________________________________
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