MAX1723EZK+T ,1.5µA IQ, Step-Up DC-DC Converters in TSOT and µDFNFeaturesThe MAX1722/MAX1723/MAX1724 compact, high-efficiency, ● Up to 90% Efficiencystep-up DC-DC c ..
MAX1723EZK-T ,1.5uA IQ / Step-Up DC-DC Converters in Thin SOT23-5applications. The Ordering Informationfamily offers different combinations of fixed or adjustablePI ..
MAX1724EZK27+T ,1.5µA IQ, Step-Up DC-DC Converters in TSOT and µDFNApplications● Pagers ● Single-Cell Battery- Powered Devices● Remote Controls● Low-Power Hand-Held ..
MAX1724EZK30+T ,1.5µA IQ, Step-Up DC-DC Converters in TSOT and µDFNapplications. The ● µDFN Package (2mm x 2mm x 0.75mm)family offers different combinations of fixed ..
MAX1724EZK33 ,1.5uA IQ / Step-Up DC-DC Converters in Thin SOT23-5ApplicationsMAX1723EZK-T-40°C to +85°C 5 SOT23 ADQGMAX1724EZK27-T -40°C to +85°C 5 SOT23 ADQHPagers ..
MAX1724EZK33+T ,1.5µA IQ, Step-Up DC-DC Converters in TSOT and µDFNMAX1722/MAX1723/ 1.5μA I , Step-Up DC-DC QMAX1724 Converters in TSOT and µDFN
MAX4552CEE+ ,±15kV ESD-Protected, Quad, Low-Voltage, SPST Analog SwitchesFeaturesThe MAX4551/MAX4552/MAX4553 are quad, low-volt-♦ ±15kV ESD Protection per IEC 1000-4-2age, ..
MAX4552CSE ,15kV ESD-Protected / Quad / Low-Voltage / SPST Analog SwitchesFeaturesThe MAX4551/MAX4552/MAX4553 are quad, low-volt-' ±15kV ESD Protection per IEC 1000-4-2age, ..
MAX4552EEE ,15kV ESD-Protected / Quad / Low-Voltage / SPST Analog SwitchesApplications MAX4551CSE 0°C to +70°C 16 Narrow SOMAX4551CPE 0°C to +70°C 16 Plastic DIPBattery-Oper ..
MAX4552ESE ,15kV ESD-Protected / Quad / Low-Voltage / SPST Analog SwitchesFeaturesThe MAX4551/MAX4552/MAX4553 are quad, low-volt-' ±15kV ESD Protection per IEC 1000-4-2age, ..
MAX4553CPE ,15kV ESD-Protected / Quad / Low-Voltage / SPST Analog SwitchesMAX4551/MAX4552/MAX455319-1391; Rev 0; 10/98±15kV ESD-Protected, Quad, Low-Voltage, SPST Analog Swi ..
MAX4553CSE ,15kV ESD-Protected / Quad / Low-Voltage / SPST Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +5V, ±10%, V- = -5V, ±10%, T = T to T , unless otherw ..
MAX1722EZK+T-MAX1723EZK+T-MAX1724EZK27+T-MAX1724EZK30+T-MAX1724EZK33+T-MAX1724EZK50+T
1.5µA IQ, Step-Up DC-DC Converters in TSOT and µDFN
General DescriptionThe 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
Beneits 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)
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)
OUT
0.8V TO 5.5V
3.3V AT
UP TO 150mAOFF
BATT
MAX1724SHDN
GND
10µH
OUT
MAX1722/MAX1723/
MAX17241.5μA 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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMinimum Input VoltageMAX1722/MAX17240.8V
Operating Input VoltageVINTA = +25°CMAX1722/MAX17240.915.5VMAX1723 (Note 2)1.25.5
Minimum Start-Up Input VoltageTA = +25°C,
RL = 3kΩ
MAX1722/MAX17240.830.91VMAX1723 (Note 2)0.871.2
Output Voltage VOUT
MAX1724E__27TA = +25°C2.6732.72.727
TA = 0°C to +85°C2.6332.767
MAX1724E__30TA = +25°C2.9703.03.030
TA = 0°C to +85°C2.9253.075
MAX1724E__33TA = +25°C3.2673.33.333
TA = 0°C to +85°C3.2183.383
MAX1724E__50TA = +25°C4.9505.05.050
TA = 0°C to +85°C4.8755.125
Output Voltage RangeVOUTMAX1722/MAX172325.5V
Feedback VoltageVFBMAX1722/MAX1723TA = +25°C1.2231.2351.247VTA = 0°C to +85°C1.2101.260
Feedback Bias CurrentIFBMAX1722/MAX1723TA = +25°C1.520nATA = +85°C2.2
N-Channel On-ResistanceRDS(ON)VOUT forced to 3.3V0.51.0Ω
P-Channel On-ResistanceRDS(ON)VOUT forced to 3.3V1.02.0Ω
N-Channel Switch Current LimitILIMVOUT forced to 3.3V400500600mA
Switch Maximum On-TimetON3.556.5µs
Synchronous Rectiier Zero-
Crossing CurrentVOUT forced to 3.3V52035mA
Quiescent Current into OUT(Notes 3, 4)1.53.6µA
Shutdown Current into OUTMAX1723/MAX1724
(Notes 3, 4)
TA = +25°C0.010.5µATA = +85°C0.1
Quiescent Current into BATTMAX1722/MAX1724
(Note 4)
TA = +25°C0.0010.5µATA = +85°C0.01
MAX1722/MAX1723/
MAX17241.5μA IQ, Step-Up DC-DC Converters in TSOT and µDFN
Absolute Maximum RatingsStresses 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).
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSShutdown Current into BATTMAX1724 (Note 4)TA = +25°C0.0010.5µATA = +85°C0.01
SHDN Voltage ThresholdVILMAX1723/MAX1724 75400mVVIHMAX1723/MAX1724500800
SHDN Input Bias CurrentMAX1723/MAX1724,
VSHDN = 5.5V
TA = +25°C2100nATA = +85°C7
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOutput VoltageVOUT
MAX1724E__272.6332.767MAX1724E__302.9253.075
MAX1724E__333.2183.383
MAX1724E__504.8755.125
Output Voltage RangeVOUTMAX1722/MAX172325.5V
Feedback VoltageVFBMAX1722/MAX17231.2001.270V
N-Channel On-ResistanceRDS(ON)VOUT forced to 3.3V1.0Ω
P-Channel On-ResistanceRDS(ON)VOUT forced to 3.3V2.0Ω
N-Channel Switch Current LimitILIMVOUT forced to 3.3V400620mA
Switch Maximum On-TimetON3.56.5µs
Synchronous Rectiier Zero-
Crossing CurrentVOUT forced to 3.3V535mA
Quiescent Current into OUT(Notes 3,4)3.6µA
SHDN Voltage ThresholdVILMAX1723/MAX172475mVVIHMAX1723/MAX1724800
MAX1722/MAX1723/
MAX17241.5μA IQ, Step-Up DC-DC Converters in TSOT and µDFN
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.)
EFFICIENCY vs. LOAD CURRENT
(VOUT = 3.3V)
MAX1722 toc02
LOAD CURRENT (mA)
EFFICIENCY (%)VIN = 2.0V
VIN = 2.5V
VIN = 1.5V
VIN = 1.0V
L = DO1606
EFFICIENCY vs. LOAD CURRENT
(VOUT = 2.5V)
MAX1722 toc03
LOAD CURRENT (mA)
EFFICIENCY (%)
VIN = 1.5V
VIN = 2.0V
VIN = 1.0VL = DO1606
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX1722 toc04
INPUT VOLTAGE (V)
OUT(MAX)
(mA)
VOUT = 2.5V
VOUT = 5.0V
VOUT = 3.3V100
STARTUP VOLTAGE
vs. LOAD CURRENT
MAX1722 toc05
LOAD CURRENT (mA)
STARTUP VOLTAGE (V)
RESISTIVE LOAD
VOUT = 5.0V
MAX1722 toc06
QUIESCENT CURRENT (µA)
OUTPUT VOLTAGE (V)
QUIESCENT CURRENT INTO OUT
vs. OUTPUT VOLTAGENO LOAD
STARTUP VOLTAGE vs.
TEMPERATURE
MAX1722 toc07
STARTUP VOLTAGE (V)-153560
NO LOAD
EFFICIENCY vs. LOAD CURRENT
(VOUT = 5.0V)
MAX1722 toc01
LOAD CURRENT (mA)
EFFICIENCY (%)VIN = 2.0VVIN = 3.3VVIN = 4.0V
VIN = 1.5V
VIN = 1.0V
L = DO1606
1µs/div
ILX
500mA/div
VOUT
50mV/div
VLX
2V/div
SWITCHING WAVEFORMSMAX1722 toc08
MAX1722/MAX1723/
MAX17241.5μA IQ, Step-Up DC-DC Converters in TSOT and µDFN
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: VOUT, 50mV/div
B: IOUT, 20mA/div
LOAD-TRANSIENT RESPONSEMAX1722 toc093.3V
50mA
1ms/div
VSHDN
1V/div
SHUTDOWN RESPONSEMAX1722 toc10
VIN = 3.3V, VOUT = 5.0V, ROUT = 100Ω
VOUT
2V/div
SHUTDOWN INPUT THRESHOLD
vs. TEMPERATURE
MAX1722 toc11
TEMPERATURE (°C)
SHUTDOWN THRESHOLD (mV)
RISING EDGE
FALLING EDGE
MAX1722/MAX1723/
MAX17241.5μA IQ, Step-Up DC-DC Converters in TSOT and µDFN
Typical Operating Characteristics (continued)
MAX1722/MAX1723/
MAX17241.5μA IQ, Step-Up DC-DC Converters in TSOT and µDFN
PIN
NAMEFUNCTIONTSOTuDFN
MAX1722MAX1723MAX1724MAX1722MAX1723MAX1724—12—2BATTBattery Input and Damping Switch
Connection13—21SHDNShutdown Input. Drive high for normal
operation. Drive low for shutdown.22333GNDGround3—11—FB
Feedback Input to Set Output Voltage. Use
a resistor-divider network to adjust the output
voltage. See Setting the Output Voltage section.44666OUTPower Output. OUT also provides bootstrap
power to the IC.55444LXInternal N-channel MOSFET Switch Drain and P-Channel Synchronous Rectiier Drain
Pin Description
Pin ConigurationsTOP VIEW
GND
OUT5LXBATT
MAX1724
TSOT4SHDN
GND
OUTFB5LXSHDN
TSOT4
MAX1723GND
OUTFB
LXBATT
MAX1722
TSOT4
BATT
GND
OUT
N.C.
MAX1722
μDFN
SHDN
BATT
GND
OUT
N.C.
MAX1724
μDFN
SHDN
GND
OUT
N.C.
MAX1723
μDFN
Detailed DescriptionThe 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 SchemeMAX1722/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 RectiicationThe 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 CircuitFigure 1. MAX1723 Simplified Functional Diagram
CONTROL
LOGIC
STARTUP
CIRCUITRY
DRIVER
GND
OUT
CURRENT
LIMIT1.235V REFERENCE
ERROR
COMPARATOR
ZERO-
CROSSING
DETECTOR
MAX1723SHDN
MAX1722/MAX1723/
MAX17241.5μA IQ, Step-Up DC-DC Converters in TSOT and µDFN
