MAX1771CSA+ Maxim, MAX1771CSA+ Datasheet - Page 6

• Manufacturer Part Number: MAX1771CSA+
• Description: Step-Up DC-DC Controller, 2.0-16.5 Vin, 12 V or Adj. Vout, 0 to 70 C, SOIC8
• Manufacturer: Maxim

Specifications of MAX1771CSA+

• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

12V or Adjustable, High-Efficiency,
Low I
6
(Circuit of Figure 2a, T
_______________________________________________________________________________________
PIN
1
2
3
4
5
6
7
8
Q
, Step-Up DC-DC Controller
NAME
AGND
SHDN
A
GND
REF
EXT
V+
CS
FB
= +25°C, unless otherwise noted.)
Gate Drive for External N-Channel Power Transistor
Power-Supply Input. Also acts as a voltage-sense point when in bootstrapped mode.
Feedback Input for Adjustable-Output Operation. Connect to ground for fixed-output operation.
Use a resistor divider network to adjust the output voltage. See Setting the Output Voltage section.
Active-High TTL/CMOS Logic-Level Shutdown Input. In shutdown mode, V
below V+ (due to the DC path from V+ to the output) and the supply current drops to 5µA
maximum. Connect to ground for normal operation.
1.5V Reference Output that can source 100µA for external loads. Bypass to GND with 0.1µF.
The reference is disabled in shutdown.
Analog Ground
High-Current Ground Return for the Output Driver
Positive Input to the Current-Sense Amplifier. Connect the current-sense resistor between CS
and GND.
A
B
I
A: SHDN, 5V/div
B: V
OUT
Typical Operating Characteristics (continued)
OUT
= 500mA, V
, 5V/div
ENTERING/EXITING SHUTDOWN
IN
= 5V
2ms/div
FUNCTION
0V
5V
0V
Pin Description
OUT
is a diode drop