19-1499; Rev 3; 12/08
60mA, SOT23 Inverting Charge Pump
with Shutdown
General Description
The MAX1697 ultra-small, monolithic, CMOS charge-
pump voltage inverter accepts an input voltage ranging
from +1.25V to +5.5V. This device features an ultra-low
12Ω output resistance, permitting loads of up to 60mA
with maximum efficiency. The MAX1697 is available
with operating frequencies of 12kHz, 35kHz, 125kHz, or
250kHz, allowing optimization of supply current or
external component size. Its small external components
and micropower shutdown mode make this device
ideal for both battery-powered and board-level voltage
conversion applications.
Oscillator control circuitry and four power MOSFET
switches are included on-chip. Applications include
generating a negative supply from a +5V or +3.3V logic
supply to power analog circuitry. All versions come in a
6-pin SOT23 package and deliver 60mA.
For applications with lower current requirements, the
MAX1719/MAX1720/MAX1721 are pin-compatible
SOT23 charge pumps that supply up to 25mA.
♦
60mA Output Current
♦
Low 12Ω Output Resistance
♦
150µA Supply Current (MAX1697R)
♦
Requires Only Two 1µF Capacitors (MAX1697U)
♦
Start-Up Current Limited
♦
+1.25V to +5.5V Input Voltage Range
♦
Slew-Rate Limited to Reduce EMI
Features
MAX1697
Ordering Information
PART
MAX1697_EUT-T
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
6 SOT23
Note 1:
The MAX1697 requires special solder temperature pro-
file described in the Absolute Maximum Ratings section.
Note 2:
The MAX1697 is available with four different operating
frequencies. Choose the desired frequency from the table
below and insert the suffix in the blank above to complete the
part number.
PART NO.
SUFFIX
R
S
T
U
FREQUENCY
(kHz)
12
35
125
250
TOP MARK
-T
AABV
AABW
AABX
AABY
+T
AABV
AABW
AABX
AABY
#T
ACBT
ACCK
ACCL
ACCM
Applications
Negative Supply from +5V or +3.3V Logic Supplies
Small LCD Panels
GaAsFET Bias Supplies
Handy-Terminals, PDAs
Battery-Operated Equipment
Note 3:
MAX1697 is available in different package material.
Add the following suffix to the part number when ordering:
-T
= Denotes a package containing lead(Pb).
+T
= Denotes a lead(Pb)-free/RoHS-compliant package.
#T
= Denotes an RoHS-compliant device that may include
lead(Pb) that is exempt under the RoHS requirements.
Typical Operating Circuit
1μF
Pin Configuration
TOP VIEW
+
OUT
1
6
C1+
INPUT
1.5V to 5.5V
C1+
IN
C1-
OUT
NEGATIVE
OUTPUT
-1
✕
V
IN
60mA
1μF
IN
2
MAX1697
5
SHDN
MAX1697U
ON
OFF
SHDN
GND
C1-
3
4
GND
SOT23
Note 4:
Leaded and lead-free top marks are identical. Per
Maxim guideline, the pin 1 indicator for leaded package is
a ‘•’ and the lead-free package is a ‘+’.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim's website at www.maxim-ic.com.
60mA, SOT23 Inverting Charge Pump
with Shutdown
MAX1697
ABSOLUTE MAXIMUM RATINGS
IN to GND .................................................................-0.3V to +6V
C1+,
SHDN
to GND .....................................-0.3V to (V
IN
+ 0.3V)
C1- to GND..............................................(V
OUT
- 0.3V) to + 0.3V
OUT to GND .............................................................+0.3V to -6V
OUT Output Current............................................................90mA
OUT Short-Circuit to GND .............................................Indefinite
Note 5:
Note 6:
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 14mW/°C above +70°C) (Note 5)...1.1W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature ..........................................................(Note 6)
Thermal properties are specified with product mounted on the PC board with one square-inch of copper area and still air.
This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the
device can be exposed to during board level solder attach and rework. Maxim recommends the use of the solder profiles
recommended in the industry standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection
reflow processes. Preheating, per this standard, is required. Hand or wave soldering is not recommended.
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 1, capacitors from Table 2, V
IN
= +5V,
SHDN
= IN,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at
T
A
= +25°C.)
PARAMETER
CONDITIONS
MAX1697R/S, R
L
= 5kΩ
Supply Voltage Range
MAX1697T/U, R
L
= 5kΩ
T
A
= +25°C
T
A
= 0°C to +85°C
T
A
= +25°C
T
A
= 0°C to +85°C
MAX1697R
Quiescent Supply Current
(Note 9)
T
A
= +25°C
MAX1697S
MAX1697T
MAX1697U
Shutdown Supply Current
Short-Circuit Current
SHDN
= GND
T
A
= +25°C
T
A
= +85°C
MAX1697R
Oscillator Frequency
T
A
= +25°C
MAX1697S
MAX1697T
MAX1697U
Voltage Conversion Efficiency
Output Resistance (Note 7)
OUT to GND Shutdown
Resistance
SHDN
Input Logic High
SHDN
Input Logic Low
SHDN
Bias Current
I
OUT
= 0, T
A
= +25°C
I
OUT
= 60mA
T
A
= +25°C
T
A
= 0°C to +85°C
3
2.0
V
IN
- 0.2
0.6
0.2
T
A
= +25°C
T
A
= +85°C
-100
0.05
10
+100
7
20
70
140
99
MIN
1.25
1.5
1.4
1.5
150
350
950
1800
0.002
0.03
170
12
35
125
250
99.9
12
25
33
8
17
50
180
360
%
Ω
Ω
V
V
nA
kHz
TYP
MAX
5.5
5.5
5.5
5.5
300
650
1700
3400
1
µA
mA
µA
V
UNITS
Output shorted to ground, T
A
= +25°C
SHDN
= GND, OUT is internally pulled to GND
in shutdown
2.5V
≤
V
IN
≤
5.5V
V
IN(MIN)
≤
V
IN
≤
2.5V
2.5V
≤
V
IN
≤
5.5V
V
IN(MIN)
≤
V
IN
≤
2.5V
SHDN
= GND or IN
2
_______________________________________________________________________________________
60mA, SOT23 Inverting Charge Pump
with Shutdown
MAX1697
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 1, capacitors from Table 2, V
IN
= +5V,
SHDN
= IN,
T
A
= 0°C to +85°C,
unless otherwise noted. Typical values are at
T
A
= +25°C.)
PARAMETER
CONDITIONS
MAX1697R
Wake-Up Time from Shutdown
I
OUT
= 15mA
MAX1697S
MAX1697T
MAX1697U
THERMAL SHUTDOWN
Trip Temperature
Hysteresis
Temperature increasing
150
15
°C
°C
MIN
TYP
1200
600
100
70
µs
MAX
UNITS
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 1, capacitors from Table 2, V
IN
= +5V,
SHDN
= IN,
T
A
= -40°C to +85°C,
unless otherwise noted.) (Note 8)
PARAMETER
Supply Voltage Range
Output Current
Quiescent Current
(Note 9)
R
L
= 5kΩ
Continuous, long-term
MAX1697R
MAX1697S
MAX1697T
MAX1697U
MAX1697R
Oscillator Frequency
MAX1697S
MAX1697T
MAX1697U
Output Resistance (Note 7)
OUT to GND Shutdown
Resistance
SHDN
Input Logic High
SHDN
Input Logic Low
I
OUT
= 60mA
SHDN
= GND, OUT is internally pulled to GND in
shutdown
2.5V
≤
V
IN
≤
5.5V
V
IN(MIN)
≤
V
IN
≤
2.5V
2.5V
≤
V
IN
≤
5.5V
V
IN(MIN)
≤
V
IN
≤
2.5V
2.1
V
IN
- 0.2
0.6
0.2
6
16
60
120
CONDITIONS
MAX1697R/S
MAX1697T/U
MIN
1.5
1.6
MAX
5.5
5.5
60
350
750
1800
3600
21
60
200
400
33
8
Ω
Ω
V
V
kHz
µA
UNITS
V
mA
RMS
Note 7:
Output resistance is guaranteed with capacitor ESR of 0.3Ω or less.
Note 8:
All specifications from -40°C to +85°C are guaranteed by design, not production tested.
Note 9:
The MAX1697 may draw high supply current during startup, up to the minimum operating supply voltage. To guarantee
proper startup, the input supply must be capable of delivering 90mA more than the maximum load current.
_______________________________________________________________________________________
3
60mA, SOT23 Inverting Charge Pump
with Shutdown
MAX1697
Typical Operating Characteristics
(Circuit of Figure 1, capacitors from Table 2, V
IN
= +5V,
SHDN
= IN, T
A
= +25°C, unless otherwise noted.)
MAX1697T
MAX1697S
MAX1697R
OUTPUT VOLTAGE
OUTPUT VOLTAGE
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
vs. OUTPUT CURRENT
vs. OUTPUT CURRENT
MAX1697 TOC01
MAX1697 TOC02
-0.5
-1.0
OUTPUT VOLTAGE (V)
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
0
10
20
30
40
50
60
70
V
IN
= +5V
V
IN
= +3.3V
V
IN
= +2V
-0.5
-1.0
OUTPUT VOLTAGE (V)
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
V
IN
= +2V
-0.5
-1.0
OUTPUT VOLTAGE (V)
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
V
IN
= +5V
V
IN
= +3.3V
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
80
0
10
20
30
40
50
60
70
80
0
10
20
30
40
50
60
70
80
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
MAX1697U
OUTPUT VOLTAGE
vs. OUTPUT CURRENT
MAX1697 TOC04
MAX1697R
EFFICIENCY vs. OUTPUT CURRENT
MAX1697 TOC05
MAX1697S
EFFICIENCY vs. OUTPUT CURRENT
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
MAX1697 TOC06
0
-0.5
-1.0
OUTPUT VOLTAGE (V)
-1.5
-2.0
-2.5
-3.0
-3.5
-4.0
-4.5
-5.0
0
10
20
30
40
50
60
70
V
IN
= +5V
V
IN
= +3.3V
V
IN
= +2V
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
100
80
0
10
20
30
40
50
60
70
80
0
10
20
30
40
50
60
70
80
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
MAX1697T
EFFICIENCY vs. OUTPUT CURRENT
MAX1697 TOC07
MAX1697U
EFFICIENCY vs. OUTPUT CURRENT
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
MAX1697 TOC08
MAX1697R/S/T/U
OUTPUT IMPEDANCE vs. INPUT VOLTAGE
MAX1697 TOC09
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
10
20
30
40
50
60
70
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
100
30
25
OUTPUT IMPEDANCE (Ω)
20
15
10
5
0
80
0
10
20
30
40
50
60
70
80
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
OUTPUT CURRENT (mA)
OUTPUT CURRENT (mA)
INPUT VOLTAGE (V)
4
_______________________________________________________________________________________
MAX1697 TOC03
0
0
0
60mA, SOT23 Inverting Charge Pump
with Shutdown
Typical Operating Characteristics (continued)
(Circuit of Figure 1, capacitors from Table 2, V
IN
= +5V,
SHDN
= IN, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX1697 TOC10
MAX1697
MAX1697R/S/T/U
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX1697 TOC11
MAX1697R
OUTPUT RESISTANCE
vs. TEMPERATURE
30
OUTPUT RESISTANCE (Ω)
25
V
IN
= +2V
20
15
10
5
0
V
IN
= +3.3V
V
IN
= +5V
MAX1697 TOC12
2.5
MAX1697U
35
30
SUPPLY CURRENT (nA)
25
20
15
10
5
0
V
IN
= +3.3V
V
IN
= +2V
V
IN
= +5V
35
V
IN
= +1.5V
2.0
SUPPLY CURRENT (mA)
1.5
MAX1697T
1.0
MAX1697S
0.5
MAX1697R
0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
INPUT VOLTAGE (V)
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX1697S
OUTPUT RESISTANCE
vs. TEMPERATURE
MAX1697 TOC13
MAX1697T
OUTPUT RESISTANCE
vs. TEMPERATURE
MAX1697 TOC14
MAX1697U
OUTPUT RESISTANCE
vs. TEMPERATURE
40
OUTPUT RESISTANCE (Ω)
35
30
25
20
15
10
5
0
V
IN
= +5V
V
IN
= +3.3V
V
IN
= +2V
V
IN
= +1.5V
MAX1697 TOC15
30
V
IN
= +1.5V
25
OUTPUT RESISTANCE (Ω)
20
15
10
5
0
-40
-20
0
20
40
60
V
IN
= +2V
V
IN
= +3.3V
V
IN
= +5V
35
30
OUTPUT RESISTANCE (Ω)
25
V
IN
= +2V
20
15
10
5
0
V
IN
= +3.3V
V
IN
= +5V
V
IN
= +1.5V
45
80
-40
-20
0
20
40
60
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
PUMP FREQUENCY
vs. TEMPERATURE
MAX1697 TOC16
MAX1697R/S
OUTPUT NOISE AND RIPPLE
MAX1697 TOC17
MAX1697T/U
OUTPUT NOISE AND RIPPLE
MAX1697 TOC18
1000
MAX1697U
PUMP FREQUENCY (kHz)
100
MAX1697T
MAX1697S
MAX1697R
V
OUT
MAX1697R
(12kHz)
V
OUT
MAX1697T
(125kHz)
10
V
OUT
MAX1697S
(35kHz)
V
IN
= +1.5V TO +5V
V
OUT
MAX1697U
(250kHz)
1
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
20μs/div
V
IN
= +3.3V, I
OUT
= 5mA,
10mV/div, AC-COUPLED
2μs/div
V
IN
= +3.3V, I
OUT
= 5mA,
10mV/div, AC-COUPLED
_______________________________________________________________________________________
5
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