Reference Design HFRD-34.0 (Rev.3, 05/08)
Maxim Integrated Products
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MAX1853
The MAX1853 monolithic, CMOS charge-pump voltage inverter in the ultra-small SC70
package features a low 15
Ω
output resistance, which permits loads up to 30mA with
maximum efficiency. The MAX1853 is available with an operating frequency of 200kHz,
allowing optimization of supply current or external component size. Small external
components and micropower shutdown mode make this device ideal for both battery-
powered and board-level voltage conversion applications.
Additional information:
www.maxim-ic.com/MAX1853
MAX6817
The MAX6817 dual switch debouncer provides clean interfacing of mechanical switches to
digital systems. The device accepts one or more bouncing inputs from a mechanical switch
and produces a clean digital output after a short, preset qualification delay. Both the switch
opening and closing bounces are removed. Robust switch inputs handle ±25V levels and are
±15kV ESD protected for use in harsh industrial environments. The MAX6817 features
single-supply operation from +2.7V to +5.5V. Undervoltage lockout circuitry ensures that the
output is in the correct state upon power-up. The MAX6817 is offered in a SOT package and
requires no external components.
Additional information:
www.maxim-ic.com/MAX6817
MAX1953
The MAX1953/MAX1954/MAX1957 is a family of versatile, economical, synchronous current-
mode, pulse-width modulation (PWM) buck controllers. These step-down controllers are
targeted for applications where cost and size are critical. The MAX1953 operates at a fixed
1MHz switching frequency, thus significantly reducing external component size and cost.
Additionally, excellent transient response is obtained using less output capacitance. The
MAX1953 operates from low 3V to 5.5V input voltage and can supply up to 10A of output
current. Selectable current limit is provided to tailor to the external MOSFETs’ on-resistance
for optimal cost and performance. The output voltage is adjustable from 0.8V to 0.86VIN.
Additional information:
www.maxim-ic.com/MAX1953
MAX4070
The MAX4069–MAX4072 low-cost, bidirectional, high-side, current-sense amplifiers are ideal
for monitoring battery charge and discharge currents in notebook PCs, cell phones, and other
portable equipment. The devices feature up to 24V input common-mode voltage range, low
100 A supply current (which drops to only 10 A in shutdown), and a total output error of less
than 1.5%. The wide 1.35V to 24V input common-mode range is independent of the supply
voltage, thus ensuring that the current-sense feedback remains accurate even when
connected to a battery pack in deep discharge.
Additional information:
www.maxim-ic.com/MAX4070