MAX1947ETA30+T Maxim Integrated Products, MAX1947ETA30+T Datasheet - Page 6

• Manufacturer Part Number: MAX1947ETA30+T
• Description: IC DC-DC CONV 3V 8-TDFN
• Manufacturer: Maxim Integrated Products
• Type: Step-Up (Boost)r

Specifications of MAX1947ETA30+T

• Internal Switch(s): Yes
• Synchronous Rectifier: Yes
• Number Of Outputs: 1
• Voltage - Output: 3V
• Current - Output: 250mA
• Frequency - Switching: Up to 2MHz
• Voltage - Input: 0.7 ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-TDFN Exposed Pad
• Power - Output: 1.95W
• Output Voltage: 3 V
• Output Current: 185 mA
• Input Voltage: 0.7 V to 3.6 V
• Supply Current: 70 uA
• Switching Frequency: 650 KHz
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: MAX1947ETA30+T

The MAX1947 compact step-up DC-DC converter starts
up with voltages as low as 0.8V and operates with input
voltages down to 0.7V. An internal synchronous rectifier
reduces cost by eliminating the need for an external
Schottky diode and improves overall efficiency by
reducing losses in the circuit. The efficiency is further
Low Input/Output Voltage
Step-Up DC-DC Converter with RESET
(V
6
IN
_______________________________________________________________________________________
= 1.5V, Circuit of Typical Application Circuit, T
PIN
—
1
2
3
4
5
6
7
8
V
RESET
V
OUT
V
IN
NAME
RESET
SHDN
PGND
BATT
GND
GND
OUT
LX
EP
POWER-ON RESET WAVEFORMS
Detailed Description
Active-Low Push-Pull Reset Output. RESET goes high 75ms (min) after the output voltage has
exceeded 90% of its final value. The RESET output is valid for output voltages as low as 0.9V. RESET
is driven low in shutdown.
Ground. Connect to exposed paddle.
Ground. Connect to exposed paddle.
Shutdown Input. Connect to BATT or logic 1 for normal operation. Connect to GND or logic 0 for a low
quiescent-current shutdown mode.
Power Ground. Connect to exposed paddle.
Inductor Connection to the Drains of the Internal n-Channel Switch and p-Channel Synchronous
Rectifier
Regulator Output. Bypass with 10µF ceramic capacitor to GND for full-load capability. For less than
50% of full load, a 4.7µF capacitor can be used.
Batter y C onnecti on. V
Exposed Paddle. Connect to GND and PGND.
20ms/div
MAX1947toc17
Typical Operating Characteristics (continued)
A
B A TT
= +25°C, unless otherwise noted.)
1V/div
1V/div
1V/div
i s used for the star tup osci l l ator and to p ow er the chi p w hen V
increased with the low 70µA quiescent current and low
on-resistance of the internal n-channel MOSFET power
switch. The MAX1947 uses Maxim’s proprietary True
Shutdown circuitry, which disconnects the output from
the input in shutdown and actively discharges the
output to ground.
V
V
RESET
SHDN
FUNCTION
V
OUT
SHUTDOWN WAVEFORMS
EXITING AND ENTERING
20ms/div
Pin Description
MAX1947toc18
1V/div
1V/div
1V/div
OU T
< V
B A TT
.