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
o
Ultra-Small: 1µF Capacitors per 100mA of Output
Current
o
No Inductors Required
o
1.1mm Height in µMAX 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
100µA Quiescent Current in Pulse-Skipping Mode
o
0.1µA Shutdown Current
MAX682/MAX683/MAX684
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
PART
MAX682ESA
MAX683EUA
MAX684EUA
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
8 µMAX
8 µMAX
Typical Operating Circuit
TOP VIEW
CXN
INPUT
2.7V TO 5.5V
R
EXT
CXP
SKIP
1
8
7
Pin Configurations
OUT
CXP
CXN
PGND
SKIP
SHDN
IN
1
2
3
8
7
OUT
CXP
CXN
PGND
MAX682
IN
SKIP
SHDN
GND
PGND
OUT
OUTPUT
5V/250mA
SHDN
IN
2
MAX682
3
6
5
GND
4
GND
4
MAX683
MAX684
6
5
SO
µMAX
________________________________________________________________
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
MAX682/MAX683/MAX684
ABSOLUTE MAXIMUM RATINGS
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
= +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
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
Input Voltage Range
Input Undervoltage Lockout
Threshold
Input Undervoltage Lockout
Hysteresis
Output Voltage
V
OUT
0 < I
LOAD
≤
I
MAX
;
3.0V
≤
IN
≤
3.6V for
SKIP
= 0,
3.0V
≤
IN
≤
3.6V for
SKIP
= 0,
3.0V
≤
IN
≤
5.5V for
SKIP
= IN
MAX682
Maximum Output Current
I
MAX
MAX683
MAX684
SKIP
= 0, V
IN
= 3.6V
No-Load Input Current
I
Q
MAX682
SKIP
= V
IN
= 3.6V
MAX683
MAX684
Load Regulation
SHDN
Logic Low Input
SHDN
On Bias Voltage
SHDN
Input Current Range
∆V
LDR
V
INL,
SHDN
V
ON,
SHDN
T
A
= +25°C
I
SHDN
(Note 2)
I
SHDN
= 22µA
Switching Frequency (Note 2)
I
SHDN
=4.4µA
Shutdown Supply Current
Shutdown Exit Time
I
Q,
SHDN
t
START
0°C < T
A
< +85°C
-40°C < T
A
< +85°C
0°C < T
A
< +85°C
-40°C < T
A
< +85°C
630
1
850
750
160
150
1000
1000
200
200
0.1
50
690
SKIP
= high, 0
≤
I
LOAD
≤
I
MAX
4.80
250
100
50
0.1
7.5
2.5
1.7
-3
0.35
750
50
1200
1300
250
270
5
µA
µs
kHz
%
V
mV
µA
0.18
mA
mA
SYMBOL
V
IN
CONDITIONS
Regulation with V
IN
> 3.6V requires
SKIP
= high
MIN
2.7
2.0
2.35
100
TYP
MAX
5.5
2.6
UNITS
V
V
mV
5.05
5.20
V
SHDN
= 0, V
IN
= 5.5V, V
OUT
= 0
R
L
= 5V/I
MAX
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
SKIP
Input Voltage Low
SKIP
Input Voltage High
SKIP
Input Leakage Current
SYMBOL
V
INL,
SKIP
V
INH,
SKIP
I
SKIP
V
IN
= 5.5V
V
IN
= 5.5V, V
SKIP
= 0V or 5.5V
2.4
-1
1
CONDITIONS
MIN
TYP
MAX
0.8
UNITS
V
µA
MAX682/MAX683/MAX684
Note 1:
Specifications to -40°C are guaranteed by design and not production tested.
Note 2:
Current into
SHDN
determines oscillator frequency: R
EXT
(kΩ) = 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
SKIP = HIGH
I
SHDN
= 22µA
8
SUPPLY CURRENT (mA)
MAX682
6
MAX682 TOC01
OUTPUT VOLTAGE vs. LOAD CURRENT
(SKIP = LOW)
MAX682 TOC03
OUTPUT VOLTAGE vs. LOAD CURRENT
(SKIP = HIGH)
SKIP = HIGH
I
SHDN
= 22µA
MAX682 TOC04
10
5.50
5.25
OUTPUT VOLTAGE (V)
5.00
4.75
4.50
4.25
5.50
5.25
OUTPUT VOLTAGE (V)
5.00
4.75
4.50
4.25
4.00
MAX684
MAX683
MAX682
MAX684
MAX682
MAX683
4
MAX683
2
MAX684
0
2
3
4
SUPPLY VOLTAGE (V)
5
6
4.00
1
10
100
1000
LOAD CURRENT (mA)
1
10
100
1000
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX682 TOC06
OSCILLATOR FREQUENCY vs.
SHUTDOWN PIN INPUT CURRENT
MAX682 TOC08
NO-LOAD SUPPLY CURRENT vs.
SHUTDOWN PIN INPUT CURRENT
SKIP = HIGH
NO-LOAD SUPPLY CURRENT (mA)
MAX682
10
MAX683
MAX682 TOC09
5.50
SKIP = LOW
5.25
OUTPUT VOLTAGE (V)
5.00
4.75
4.50
4.25
4.00
3.75
3.50
2
3
4
SUPPLY VOLTAGE (V)
5
6
SKIP = HIGH
10M
100
OSCILLATOR FREQUENCY (Hz)
1M
100k
1
MAX684
10k
0.1
1
10
100
SHDN INPUT CURRENT (µA)
0.1
0.1
1
10
100
SHDN INPUT CURRENT (µA)
_______________________________________________________________________________________
3
3.3V-Input to Regulated 5V-Output
Charge Pumps
MAX682/MAX683/MAX684
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 EFFICIENCY
vs. LOAD CURRENT (SKIP = LOW)
MAX682 TOC10
MAX683 EFFICIENCY
vs. LOAD CURRENT (SKIP = LOW)
MAX682 TOC11
MAX684 EFFICIENCY
vs. LOAD CURRENT (SKIP = LOW)
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 3.0V
MAX682 TOC12
100
90
80
EFFICIENCY (%)
V
IN
= 3.0V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 3.0V
100
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
LOAD CURRENT (mA)
V
IN
= 3.3V
V
IN
= 3.6V
0.1
1
10
100
1000
0.1
1
10
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
MAX682 EFFICIENCY
vs. LOAD CURRENT (SKIP = HIGH)
MAX682 TOC13
MAX683 EFFICIENCY
vs. LOAD CURRENT (SKIP = HIGH)
90
80
EFFICIENCY (%)
EFFICIENCY (%)
70
60
50
40
30
20
V
IN
= 5.0V
V
IN
= 3.3V
V
IN
= 3.0V
MAX682 TOC14
MAX684 EFFICIENCY
vs. LOAD CURRENT (SKIP = HIGH)
80
70
60
50
40
30
20
V
IN
= 5.0V
V
IN
= 3.0V
V
IN
= 3.3V
MAX682 TOC15
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
1
10
100
I
SHDN
= 22µA
V
IN
= 5.0V
V
IN
= 3.3V
V
IN
= 3.0V
100
90
10
0
1000
1
10
I
SHDN
= 22µA
100
1000
10
0
1
10
I
SHDN
= 22µA
100
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
OUTPUT WAVEFORM
(SKIP = HIGH)
MAX682 TOC16
OUTPUT WAVEFORM
(SKIP = LOW)
MAX682 TOC17
50mV/div
50mV/div
200ns/div
SKIP = HIGH, I
SHDN
= 22µA, I
LOAD
= 250mA, MAX682
200ns/div
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.)
MAX682/MAX683/MAX684
SHUTDOWN TIMING
MAX682 TOC18
LINE-TRANSIENT RESPONSE
MAX682 TOC20
LOAD-TRANSIENT RESPONSE
MAX682 TOC19
A
A
A
B
B
B
100µs/div
A: OUTPUT VOLTAGE: SKIP = HIGH, R
L
= 5V / I
MAX
, 2V/div
B: SHDN VOLTAGE: 1V/div
2ms/div
A: INPUT VOLTAGE: V
IN
= 3.1V TO 3.6V, 500mV/div
B: OUTPUT VOLTAGE: SKIP = HIGH, I
SHDN
= 22µA,
I
LOAD
= 250mA, 50mV/div, MAX682
2ms/div
A: LOAD CURRENT: I
LOAD
= 5mA TO 250mA, 500mA/div
B: OUTPUT VOLTAGE: SKIP = HIGH, I
SHDN
= 22µA,
100mV/div, MAX682
Pin Description
PIN
1
NAME
SKIP
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.
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
(kΩ) = 45000 (V
IN
- 0.69V) / f
OSC
(kHz).
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).
Ground Pin. Connect to PGND through a short trace.
Power Ground Pin
Negative Terminal of the Charge-Pump Transfer Capacitor
Positive Terminal of the Charge-Pump Transfer Capacitor
Fixed 5V Power Output. Bypass to PGND with output filter capacitor.
2
SHDN
3
4
5
6
7
8
IN
GND
PGND
CXN
CXP
OUT
_______________________________________________________________________________________
5
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