MAX1801 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Digital Camera Step-Up Slave DC-DC Controller

19-1741 Rev 0; 10/00
Digital Camera Step-Up Slave
DC-DC Controller
General Description
The MAX1801 step-up slave DC-DC controller is used
with either the MAX1800 (step-up) or the MAX1802 (step-
down) master DC-DC converter to provide a complete
power-supply solution for digital still and digital video
cameras. By using the master converter’s reference volt-
age and oscillator, the size and the cost of the slave con-
troller are reduced and all converters are guaranteed to
switch at the same frequency.
The MAX1801 drives an external N-channel MOSFET
and can be used in step-up, single-ended primary
inductance converter (SEPIC), and flyback topologies. If
extra supplies are required for a new design, slave con-
trollers can be added to an existing master circuit with
minimal redesign, saving both cost and time. The
MAX1801 features a built-in soft-start, short-circuit pro-
tection, and an adjustable duty-cycle limit.
The MAX1801 is available in a space-saving 8-pin
SOT23 package. Separate evaluation kits combining the
MAX1800/MAX1801 (MAX1800EVKIT) and MAX1802/
MAX1801 (MAX1802EVKIT) are available to expedite
designs.
________________________Applications
Digital Still Cameras
Digital Video Cameras
Portable DVD Players
Internet Access Tablets
PDAs
Hand-Held Devices
Features
o Provides Simple Expandability for the MAX1800
and MAX1802 Master Converters
o Operates in Step-Up, SEPIC, and Flyback
Topologies
o 100kHz to 1MHz Adjustable Operating Frequency
o Duty-Cycle Limit Adjustable from 40% to 90%
o Soft-Start
o Short-Circuit Protection
o 0.01µA Supply Current in Shutdown Mode
o Tiny 8-Pin SOT23 Package
PART
MAX1801EKA-T
Ordering Information
TEMP. RANGE
-40°C to +85°C
PIN-PACKAGE
8 SOT23-8
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
BATTERY
0.7V TO V_OUT
V_OUT
MAX1800
OR
MAX1802
1.25V
2.2V TO 5.5V
MAX1801
REF
DL
OSC
FB
IN
COMP
DCON
GND
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