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
MAX1724EZK50 ,1.5uA IQ / Step-Up DC-DC Converters in Thin SOT23-5ELECTRICAL CHARACTERISTICS(V = 1.2V, V = 3.3V (MAX1722/MAX1723), V = V (MAX1724), SHDN = OUT, R = ∞ ..
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 ..
MAX4553EPE ,15kV ESD-Protected / Quad / Low-Voltage / SPST Analog SwitchesGeneral Description ________
MAX1722EZK-T-MAX1723EZK-T-MAX1724EZK33-MAX1724EZK50-MAX1724EZK50-T
1.5uA IQ / Step-Up DC-DC Converters in Thin SOT23-5
General DescriptionThe MAX1722/MAX1723/MAX1724 compact, high-effi-
ciency, step-up DC-DC converters are available in tiny, 5-
pin thin SOT23 packages. They feature an extremely low
1.5µA quiescent supply current to ensure the highest pos-
sible 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 fea-
ture a 0.5ΩN-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
FeaturesUp to 90% EfficiencyNo External Diode or FETs Needed 1.5µA Quiescent Supply Current0.1µA Logic-Controlled Shutdown±1% Output Voltage AccuracyFixed Output Voltage (MAX1724) or Adjustable
Output Voltage (MAX1722/MAX1723)Up to 150mA Output Current0.8V to 5.5V Input Voltage Range0.91V Guaranteed Startup (MAX1722/MAX1724)Internal EMI Suppression (MAX1722/MAX1724)Thin SOT23-5 Package (1.1mm max Height)
MAX1722/MAX1723/MAX1724
1.5µA IQ, Step-Up DC-DC Converters
in Thin SOT23-5ypical Operating Circuit19-1735; Rev 0; 7/01
Ordering Information
Selector Guide
Pin Configurations
MAX1722/MAX1723/MAX1724
1.5µA IQ, Step-Up DC-DC Converters
in Thin SOT23-5
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(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)
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.
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 SOT23 (derate 7.1mW/°C above +70°C)...571mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s)................................+300°C
MAX1722/MAX1723/MAX1724
1.5µA IQ, Step-Up DC-DC Converters
in Thin SOT23-5
ELECTRICAL CHARACTERISTICS (continued)(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:VOUTforced to the following conditions to inhibit switching: VOUT= 1.05 ✕VOUT(NOM)(MAX1724), VOUT= 3.465V
(MAX1722/MAX1723).
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)
MAX1722/MAX1723/MAX1724
1.5µA IQ, Step-Up DC-DC Converters
in Thin SOT23-5
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.)
MAX1722/MAX1723/MAX1724
1.5µA IQ, Step-Up DC-DC Converters
in Thin SOT23-5
Pin Description
Typical Operating 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.)
MAX1722/MAX1723/MAX1724
1.5µA IQ, Step-Up DC-DC Converters
in Thin SOT23-5
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 efficien-
cy by minimizing losses in the circuit (see Synchronous
Rectificationsection). 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 SchemeA forced discontinuous, current-limited, pulse-frequency-
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 cur-
rent 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 comparator senses that the output has fallen
below the regulation threshold, another cycle begins.
Synchronous RectificationThe 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 sig-
nificantly reduced, improving efficiency without the
addition of external components.
Low-Voltage Startup CircuitThe MAX1722/MAX1723/MAX1724 contain a low-volt-
age startup circuit to control DC-DC operation until the
Figure 1. MAX1723 Simplified Functional Diagram
