General Description
The MAX1722/MAX1723/MAX1724 compact, high-efficiency,
step-up DC-DC converters are available in tiny, 5-pin
TSOT packages. They feature an extremely low 1.5μA
quiescent supply current to ensure the highest possible
light-load efficiency. Optimized for operation from one
to two alkaline or nickel-metal-hydride (NiMH) cells, or
a single Li+ cell, these devices are ideal for applications
where extremely low quiescent current and ultra-small
size are critical.
Built-in synchronous rectification significantly improves
efficiency and reduces size and cost by eliminating the
need for an external Schottky diode. All three devices
feature a 0.5Ω N-channel power switch. The MAX1722/
MAX1724 also feature proprietary noise-reduction circuitry,
which suppresses electromagnetic interference (EMI)
caused by the inductor in many step-up applications. The
family offers different combinations of fixed or adjustable
outputs, shutdown, and EMI reduction (see Selector
Guide).
Applications
Benets and Features
●Up to 90% Efficiency
●No External Diode or FETs Needed
● 1.5μA Quiescent Supply Current
● 0.1μA Logic-Controlled Shutdown
●±1% Output Voltage Accuracy
●Fixed Output Voltage (MAX1724) or Adjustable
Output Voltage (MAX1722/MAX1723)
●Up to 150mA Output Current
●0.8V to 5.5V Input Voltage Range
●0.91V Guaranteed Startup (MAX1722/MAX1724)
●Internal EMI Suppression (MAX1722/MAX1724)
●TSOT Package (0.9mm typ Height)
●µDFN Package (2mm x 2mm x 0.75mm)
19-1735; Rev 5; 8/17
Ordering Information and Selector Guide appears at end of
data sheet.
●Pagers
●Remote Controls
●Remote Wireless
Transmitters
●Personal
Medical Devices
●Digital Still Cameras
●Single-Cell Battery-
Powered Devices
●Low-Power Hand-Held
Instruments
●MP3 Players
●Personal Digital
Assistants (PDA)
LX
OUT
IN
0.8V TO 5.5V
3.3V AT
UP TO 150mA
ON
OFF
BATT
MAX1724
SHDN
GND
10µH
OUT
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
Typical Operating Circuit
OUT, SHDN, BATT, LX to GND ...............................-0.3V to +6V
FB to GND .............................................. -0.3V to (VOUT + 0.3V)
OUT, LX Current ......................................................................1A
Continuous Power Dissipation (TA = +70°C)
5-Pin Thin SOT (derate 2.7mW/°C above +70°C) ...219.10mW
Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Soldering Temperature
Lead(Pb)-free packages ..............................................+260°C
Packages containing lead(Pb) .....................................+240°C
(VBATT = 1.2V, VOUT = 3.3V (MAX1722/MAX1723), VOUT = VOUT(NOM) (MAX1724), SHDN = OUT, RL = ∞, TA = 0°C to +85°C,
unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage MAX1722/MAX1724 0.8 V
Operating Input Voltage VIN TA = +25°C MAX1722/MAX1724 0.91 5.5 V
MAX1723 (Note 2) 1.2 5.5
Minimum Start-Up Input Voltage TA = +25°C,
RL = 3kΩ
MAX1722/MAX1724 0.83 0.91 V
MAX1723 (Note 2) 0.87 1.2
Output Voltage VOUT
MAX1724E__27 TA = +25°C 2.673 2.7 2.727
V
TA = 0°C to +85°C 2.633 2.767
MAX1724E__30 TA = +25°C 2.970 3.0 3.030
TA = 0°C to +85°C 2.925 3.075
MAX1724E__33 TA = +25°C 3.267 3.3 3.333
TA = 0°C to +85°C 3.218 3.383
MAX1724E__50 TA = +25°C 4.950 5.0 5.050
TA = 0°C to +85°C 4.875 5.125
Output Voltage Range VOUT MAX1722/MAX1723 2 5.5 V
Feedback Voltage VFB MAX1722/MAX1723 TA = +25°C 1.223 1.235 1.247 V
TA = 0°C to +85°C 1.210 1.260
Feedback Bias Current IFB MAX1722/MAX1723 TA = +25°C 1.5 20 nA
TA = +85°C 2.2
N-Channel On-Resistance RDS(ON) VOUT forced to 3.3V 0.5 1.0 Ω
P-Channel On-Resistance RDS(ON) VOUT forced to 3.3V 1.0 2.0 Ω
N-Channel Switch Current Limit ILIM VOUT forced to 3.3V 400 500 600 mA
Switch Maximum On-Time tON 3.5 5 6.5 µs
Synchronous Rectier Zero-
Crossing Current VOUT forced to 3.3V 5 20 35 mA
Quiescent Current into OUT (Notes 3, 4) 1.5 3.6 µA
Shutdown Current into OUT MAX1723/MAX1724
(Notes 3, 4)
TA = +25°C 0.01 0.5 µA
TA = +85°C 0.1
Quiescent Current into BATT MAX1722/MAX1724
(Note 4)
TA = +25°C 0.001 0.5 µA
TA = +85°C 0.01
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
2
Absolute Maximum Ratings
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
(VBATT = 1.2V, VOUT = 3.3V (MAX1722/MAX1723), VOUT = VOUT(NOM) (MAX1724), SHDN = OUT, RL = ∞, TA = -40°C to +85°C,
unless otherwise noted.) (Note 1)
(VBATT = 1.2V, VOUT = 3.3V (MAX1722/MAX1723), VOUT = VOUT(NOM) (MAX1724), SHDN = OUT, RL = ∞, TA = 0°C to +85°C,
unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
Note 1: Limits are 100% production tested at TA = +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2: Guaranteed with the addition of a Schottky MBR0520L external diode between LX and OUT when using the MAX1723 with
only one cell, and assumes a 0.3V voltage drop across the Schottky diode (see Figure 3).
Note 3: Supply current is measured with an ammeter between the output and OUT pin. This current correlates directly with actual
battery supply current, but is reduced in value according to the step-up ratio and efficiency.
Note 4: VOUT forced to the following conditions to inhibit switching: VOUT = 1.05 x VOUT(NOM) (MAX1724), VOUT = 3.465V
(MAX1722/MAX1723).
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Shutdown Current into BATT MAX1724 (Note 4) TA = +25°C 0.001 0.5 µA
TA = +85°C 0.01
SHDN Voltage Threshold VIL MAX1723/MAX1724 75 400 mV
VIH MAX1723/MAX1724 500 800
SHDN Input Bias Current MAX1723/MAX1724,
VSHDN = 5.5V
TA = +25°C 2 100 nA
TA = +85°C 7
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Voltage VOUT
MAX1724E__27 2.633 2.767
V
MAX1724E__30 2.925 3.075
MAX1724E__33 3.218 3.383
MAX1724E__50 4.875 5.125
Output Voltage Range VOUT MAX1722/MAX1723 2 5.5 V
Feedback Voltage VFB MAX1722/MAX1723 1.200 1.270 V
N-Channel On-Resistance RDS(ON) VOUT forced to 3.3V 1.0 Ω
P-Channel On-Resistance RDS(ON) VOUT forced to 3.3V 2.0 Ω
N-Channel Switch Current Limit ILIM VOUT forced to 3.3V 400 620 mA
Switch Maximum On-Time tON 3.5 6.5 µs
Synchronous Rectier Zero-
Crossing Current VOUT forced to 3.3V 5 35 mA
Quiescent Current into OUT (Notes 3,4) 3.6 µA
SHDN Voltage Threshold VIL MAX1723/MAX1724 75 mV
VIH MAX1723/MAX1724 800
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
3
Electrical Characteristics
Electrical Characteristics (continued)
(Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), VBATT = VIN = 1.5V, L = 10μH, CIN = 10μF, COUT = 10μF, TA = +25°C,
unless otherwise noted.)
100
0.01 0.1 1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
MAX1722 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)
60
80
50
70
90 VIN = 2.0V VIN = 2.5V
VIN = 1.5V
VIN = 1.0V
L = DO1606
100
0.01 0.1 1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
MAX1722 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
60
80
50
70
90
VIN = 1.5V
VIN = 2.0V
VIN = 1.0V L = DO1606
0
40
120
80
160
200
0 21 3 4 5
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1722 toc04
INPUT VOLTAGE (V)
IOUT(MAX) (mA)
VOUT = 2.5V
VOUT = 5.0V
VOUT = 3.3V
10 100
0.8
1.0
1.2
1.4
1.6
2.0
1.8
2.2
2.4
0.01 0.1 1
STARTUP VOLTAGE
vs. LOAD CURRENT
MAX1722 toc05
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
0.6
RESISTIVE LOAD
VOUT = 5.0V
0
0.4
0.2
0.8
0.6
1.2
1.0
1.4
1.8
1.6
2.0
1.0 2.0 2.5 3.01.5 3.5 4.0 4.5 5.0 5.5
MAX1722 toc06
QUIESCENT CURRENT (µA)
OUTPUT VOLTAGE (V)
QUIESCENT CURRENT INTO OUT
vs. OUTPUT VOLTAGE
NO LOAD
0
0.4
0.2
0.8
0.6
1.0
1.2
-40 85
STARTUP VOLTAGE vs.
TEMPERATURE
MAX1722 toc07
TEMPERATURE (°C)
STARTUP VOLTAGE (V)
10-15 35 60
NO LOAD
100
0.01 0.1 1 10 100 1000
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5.0V)
MAX1722 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)
60
80
50
70
90 VIN = 2.0V VIN = 3.3V VIN = 4.0V
VIN = 1.5V
VIN = 1.0V
L = DO1606
1µs/div
ILX
500mA/div
VOUT
50mV/div
VLX
2V/div
SWITCHING WAVEFORMS
MAX1722 toc08
IOUT = 50mA, VOUT = 5.0V, VIN = 3.3V
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
Maxim Integrated
│
4
www.maximintegrated.com
Typical Operating Characteristics
(Figure 3 (MAX1723), Figure 7 (MAX1722), Figure 8 (MAX1724), VBATT = VIN = 1.5V, L = 10μH, CIN = 10μF, COUT = 10μF, TA = +25°C,
unless otherwise noted.)
200µs/div
A
A: VOUT, 50mV/div
B: IOUT, 20mA/div
B
LOAD-TRANSIENT RESPONSE
MAX1722 toc09
3.3V
50mA
0
1ms/div
VSHDN
1V/div
5V
0
0
2V
SHUTDOWN RESPONSE
MAX1722 toc10
VIN = 3.3V, VOUT = 5.0V, ROUT = 100Ω
VOUT
2V/div
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
-40 -15 10 35 60 85
SHUTDOWN INPUT THRESHOLD
vs. TEMPERATURE
MAX1722 toc11
TEMPERATURE (°C)
SHUTDOWN THRESHOLD (mV)
RISING EDGE
FALLING EDGE
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
Maxim Integrated
│
5
www.maximintegrated.com
Typical Operating Characteristics (continued)
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
6
PIN
NAME FUNCTION
TSOT uDFN
MAX1722 MAX1723 MAX1724 MAX1722 MAX1723 MAX1724
1 — 1 2 — 2 BATT Battery Input and Damping Switch
Connection
— 1 3 — 2 1 SHDN Shutdown Input. Drive high for normal
operation. Drive low for shutdown.
2 2 2 3 3 3 GND Ground
3 3 — 1 1 — FB
Feedback Input to Set Output Voltage. Use a
resistor-divider network to adjust the output
voltage. See Setting the Output Voltage
section.
4 4 4 6 6 6 OUT Power Output. OUT also provides bootstrap
power to the IC.
5 5 5 4 4 4 LX Internal N-channel MOSFET Switch Drain
and P-Channel Synchronous Rectier Drain
— — — 5 5 5 N.C. No connect.
Pin Description
Pin Congurations
TOP VIEW
GND
OUT
1 5 LXBATT
MAX1724
TSOT
2
3 4
SHDN
GND
OUTFB
1 5 LXSHDN
TSOT
2
3 4
MAX1723
GND
OUTFB
1
+
5 LXBATT
MAX1722
TSOT
2
3 4
4
5
6
3
1
2
FB
BATT
GND
OUT
N.C.
LX
MAX1722
µDFN
4
5
6
3
1
2
SHDN
BATT
GND
OUT
N.C.
LX
MAX1724
µDFN
4
5
6
3
1
2
FB
SHDN
GND
OUT
N.C.
LX
MAX1723
µDFN
Detailed Description
The MAX1722/MAX1723/MAX1724 compact, high-effi-
ciency, step-up DC-DC converters are guaranteed to
start up with voltages as low as 0.91V and operate with
an input voltage down to 0.8V. Consuming only 1.5μA of
quiescent current, these devices include a built-in syn-
chronous rectifier that reduces cost by eliminating the
need for an external diode and improves overall efficiency
by minimizing losses in the circuit (see Synchronous
Rectification section). The MAX1722/MAX1724 feature
a clamp circuit that reduces EMI due to inductor ringing.
The MAX1723/MAX1724 feature an active-low shutdown
that reduces quiescent supply current to 0.1μA. The
MAX1722/MAX1723 have an adjustable output voltage,
while the MAX1724 is available with four fixed-output
voltage options (see Selector Guide). Figure 1 is the
MAX1723 simplified functional diagram and Figure 2 is
the MAX1724 simplified functional diagram.
PFM Control Scheme
A forced discontinuous, current-limited, pulse-frequency-
modulation (PFM) control scheme is a key feature of the
MAX1722/MAX1723/MAX1724. This scheme provides
ultra-low quiescent current and high efficiency over a
wide output current range. There is no oscillator; the
inductor current is limited by the 0.5A N-channel current
limit or by the 5μs switch maximum on-time. Following
each on cycle, the inductor current must ramp to zero
before another cycle may start. When the error compara-
tor senses that the output has fallen below the regulation
threshold, another cycle begins.
Synchronous Rectication
The internal synchronous rectifier eliminates the need for
an external Schottky diode, thus reducing cost and board
space. While the inductor discharges, the P-channel
MOSFET turns on and shunts the MOSFET body diode.
As a result, the rectifier voltage drop is significantly
reduced, improving efficiency without the addition of
external components.
Low-Voltage Startup Circuit
The MAX1722/MAX1723/MAX1724 contain a low-volt-
age startup circuit to control DC-DC operation until the
output voltage exceeds 1.5V (typ). The minimum start-
Figure 1. MAX1723 Simplified Functional Diagram
P
N
CONTROL
LOGIC
STARTUP
CIRCUITRY
DRIVER
GND
FB
OUT
LX
CURRENT
LIMIT
1.235V REFERENCE
ERROR
COMPARATOR
ZERO-
CROSSING
DETECTOR
MAX1723
SHDN
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
7
up voltage is a function of load current (see Typical
Operating Characteristics). This circuit is powered from
the BATT pin for the MAX1722/MAX1724, guaranteeing
startup at input voltages as low as 0.91V. The MAX1723
lacks a BATT pin; therefore, this circuit is powered
through the OUT pin. Adding a Schottky diode in parallel
with the P-channel synchronous rectifier allows for startup
voltages as low as 1.2V for the MAX1723 (Figure 3). The
external Schottky diode is not needed for input voltages
greater than 1.8V. Once started, the output maintains
the load as the battery voltage decreases below the
startup voltage.
Shutdown (MAX1723/MAX1724)
The MAX1723/MAX1724 enter shutdown when the SHDN
pin is driven low. During shutdown, the body diode of the
P-channel MOSFET allows current to flow from the bat-
tery to the output. VOUT falls to approximately VIN - 0.6V
and LX remains high impedance. Shutdown can be pulled
as high as 6V, regardless of the voltage at BATT or OUT.
For normal operation, connect SHDN to the input.
Figure 2. MAX1724 Simplified Functional Diagram
Figure 3. MAX1723 Single-Cell Operation
P
N
CONTROL
LOGIC
STARTUP
CIRCUITRY
DAMPING
SWITCH
DRIVER
GND
SHDN
R1
R2
BATT
LX
OUT
CURRENT
LIMIT
MAX1724
ERROR
COMPARATOR
ZERO-
CROSSING
DETECTOR
1.235V REFERENCE
VOUT = 3.6V
1.2V TO VOUT
D1
10µH
10µF
R2
2.37MΩ
R1
1.24MΩ
10µF
LX
OUT
SHDN
GND FB
MAX1723
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
8
BATT/Damping Switch
(MAX1722/MAX1724)
The MAX1722/MAX1724 include an internal damping
switch (Figure 4) to minimize ringing at LX and reduce
EMI. When the energy in the inductor is insufficient to
supply current to the output, the capacitance and induc-
tance at LX form a resonant circuit that causes ringing.
The damping switch supplies a path to quickly dissipate
this energy, suppressing the ringing at LX. This does
not reduce the output ripple, but does reduce EMI with
minimal impact on efficiency. Figures 5 and 6 show the
LX node voltage waveform without and with the damping
switch, respectively.
Design Procedure
Setting the Output Voltage
(MAX1722/MAX1723)
The output voltage can be adjusted from 2V to 5.5V using
external resistors R1 and R2 (Figure 7). Since FB leakage
is 20nA (max), select feedback resistor R1 in the 100kΩ to
1MΩ range. Calculate R2 as follows:
OUT
FB
V
R 2 R1 1
V
= −
where VFB = 1.235V.
Figure 4. Simplified Diagram of Damping Switch
Figure 5. LX Ringing Without Damping Switch (MAX1723)
Figure 6. LX Ringing With Damping Switch (MAX1722/MAX1724)
MAX1722
MAX1724
PDRV
DAMP
NDRV
TIMING
CIRCUIT
OUT
VOUT
VIN
BATT
LX
DAMPING
SWITCH
GND
P
N
1µs/div
1V/div
1µs/div
1V/div
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
9
Inductor Selection
The control scheme of the MAX1722/MAX1723/MAX1724
permits flexibility in choosing an inductor. A 10μH induc-
tor value performs well in most applications. Smaller
inductance values typically offer smaller physical size for
a given series resistance, allowing the smallest overall
circuit dimensions. Circuits using larger inductance val-
ues may start up at lower battery voltages, provide higher
efficiency, and exhibit less ripple, but they may reduce
the maximum output current. This occurs when the induc-
tance is sufficiently large to prevent the maximum current
limit (ILIM) from being reached before the maximum on-
time (tON(MAX)) expires.
For maximum output current, choose the inductor value
so that the controller reaches the current-limit before the
maximum on-time is triggered:
BATT ON(MAX)
LIM
Vt
L I
<
where the maximum on-time is typically 5μs, and the
current limit (ILIM) is typically 500mA (see Electrical
Characteristics table).
For larger inductor values, determine the peak inductor
current (IPEAK) by:
BATT ON(MAX)
PEAK
Vt
IL
=
The inductor’s incremental saturation current rating should
be greater than the peak switching current. However, it is
generally acceptable to bias the inductor into saturation
by as much as 20%, although this will slightly reduce
efficiency. Table 1 lists suggested inductors and suppliers.
Maximum Output Current
The maximum output current depends on the peak induc-
tor current, the input voltage, the output voltage, and the
overall efficiency (η):
( )
BATT
PEAK
OUT MAX OUT
V
1
II
2V
= η
Figure 7. Adjustable Output Circuit
Figure 8. MAX1724 Standard Application Circuit
Table 1. Suggested Inductors and
Suppliers
MANUFACTURER INDUCTOR PHONE
WEBSITE
Coilcraft DO1608 Series
DO1606 Series
847-639-2361
www.coilcraft.com
Murata LQH4C Series 770-436-1300
www.murata.com
Sumida
CDRH4D18 Series
CR32 Series
CMD4D06 Series
847-545-6700
www.sumida.com
Sumitomo/
Daidoo Electronics CXLD140 Series +81 (06) 6355-5733
www.daidoo.co.jp
Toko 3DF Type
D412F Type
847-297-0070
www.toko.com
MAX1722
GND
BATT OUTPUT
2V TO 5.5V
INPUT
0.8V TO VOUT 10µH
LX
OUT
FB
R2 10µF
R1
10µF
MAX1724
GND
BATT
OUTPUT
VOUT (NOM)
INPUT
0.8V TO VOUT 10µH
C2
10µF
SHDN
LX
OUT
C1
10µF
OFF
ON
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
10
For most applications, the peak inductor current equals
the current limit. However, for applications using large
inductor values or low input voltages, the maximum
ontime limits the peak inductor current (see Inductor
Selection section).
Capacitor Selection
Choose input and output capacitors to supply the input
and output peak currents with acceptable voltage ripple.
The input filter capacitor (CIN) reduces peak currents
drawn from the battery and improves efficiency. Low
equivalent series resistance (ESR) capacitors are recom-
mended. Ceramic capacitors have the lowest ESR, but
low ESR tantalum or polymer capacitors offer a good bal-
ance between cost and performance.
Output voltage ripple has two components: variations in
the charge stored in the output capacitor with each LX
pulse, and the voltage drop across the capacitor’s ESR
caused by the current into and out of the capacitor:
( ) ( )
( ) ( )
( )
( )
()
22
RIPPLE RIPPLE C RIPPLE ESR
PEAK
RIPPLE ESR ESR COUT
RIPPLE C PEAK OUT
OUT BATT OUT
VV V
V I R
1L
V I -I
2 V -V C
= +
≈
≈
where IPEAK is the peak inductor current (see Inductor
Selection section). For ceramic capacitors, the output
voltage ripple is typically dominated by VRIPPLE(C). For
example, a 10μF ceramic capacitor and a 10μH inductor
typically provide 75mV of output ripple when stepping up
from 3.3V to 5V at 50mA. Low input-to-output voltage
differences (i.e. two cells to 3.3V) require higher output
capacitor values.
Capacitance and ESR variation of temperature should be
considered for best performance in applications with wide
operating temperature ranges. Table 2 lists suggested
capacitors and suppliers.
PC Board Layout Considerations
Careful PC board layout is important for minimizing
ground bounce and noise. Keep the IC’s GND pin and the
ground leads of the input and output capacitors less than
0.2in (5mm) apart using a ground plane. In addition, keep
all connections to FB (MAX1722/MAX1723 only) and LX
as short as possible.
Table 2. Suggested Surface-Mount Capacitors and Manufacturers (C1 and C2)
MANUFACTURER CAPACITOR
VALUE DESCRIPTION PHONE
WEBSITE
AVX
1µF to 10µF X7R Ceramic 843-448-9411
www.avxcorp.com
10µF to 330µF TAJ Tantalum Series
TPS Tantalum Series
Kemet
1µF to 22µF X5R/X7R Ceramic 864-963-6300
www.kemet.com
10µF to 330µF T494 Tantalum Series
68µF to 330µF T520 Tantalum Series
Sanyo 33µF to 330µF TPC Polymer Series 408-749-9714
www.secc.co.jp
Taiyo Yuden 33µF to 330µF X5R/X7R Ceramic 800-368-2496
www.t-yuden.org
TDK 1µF to 10µF X7R Ceramic 847-803-6100
www.tdk.com
Vishay Sprague 10µF to 330µF 594D Tantalum Series
595D Tantalum Series
203-452-5664
www.vishay.com
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
11
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
PART OUTPUT (V) SHDN LX
DAMPING
MAX1722EZK Adjustable No Yes
MAX1723EZK Adjustable Yes No
MAX1724EZK27 Fixed 2.7 Yes Yes
MAX1724EZK30 Fixed 3.0 Yes Yes
MAX1724EZK33 Fixed 3.3 Yes Yes
MAX1724EZK50 Fixed 5.0 Yes Yes
MAX1722ELT Adjustable No Yes
MAX1723ELT Adjustable Yes No
MAX1724ELT27 Fixed 2.7 Yes Yes
MAX1724ELT30 Fixed 3.0 Yes Yes
MAX1724ELT33 Fixed 3.3 Yes Yes
MAX1724ELT50 Fixed 5.0 Yes Yes
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
TSOT Z5+1 21-0113 90-0241
µDFN L622+1 21-0164 90-0004
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX1722EZK+T -40°C to +85°C 5 TSOT ADQF
MAX1723EZK+T -40°C to +85°C 5 TSOT ADQG
MAX1724EZK27+T -40°C to +85°C 5 TSOT ADQH
MAX1724EZK30+T -40°C to +85°C 5 TSOT ADQI
MAX1724EZK33+T -40°C to +85°C 5 TSOT ADQJ
MAX1724EZK50+T -40°C to +85°C 5 TSOT ADQK
MAX1722ELT+T -40°C to +85°C 6 μDFN ADH
MAX1723ELT+T -40°C to +85°C 6 μDFN ADI
MAX1724ELT27+T -40°C to +85°C 6 μDFN ADJ
MAX1724ELT30+T -40°C to +85°C 6 μDFN ADK
MAX1724ELT33+T -40°C to +85°C 6 μDFN ADL
MAX1724ELT50+T -40°C to +85°C 6 μDFN ADM
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
www.maximintegrated.com Maxim Integrated
│
12
Selector Guide Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Ordering Information
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 7/01 Initial release —
1 9/12 Added lead-free and tape-and-reel designations and added soldering
temperatures 1, 2
2 5/13 Corrected package and thermal information in Feature, Ordering Information,
Absolute Maximum Ratings, Pin Conguration, and Package Information 1, 2, 11
3 12/15 Added 2 x 2 µDFN package 1-3, 5, 11
4 5/16 Updated Pin Congurations diagram and Pin Description table 6
5 8/17 Updated Pin Congurations diagram and Ordering Information table 6, 12
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX1722/MAX1723/
MAX1724
1.5μA IQ, Step-Up DC-DC
Converters in TSOT and µDFN
© 2017 Maxim Integrated Products, Inc.
│
13
Revision History
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
