MAX1771 Maxim, MAX1771 Datasheet - Page 6

• Manufacturer Part Number: MAX1771
• Description: 12V or Adjustable / High-Efficiency / Low IQ / Step-Up DC-DC Controller
• Manufacturer: Maxim

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12V or Adjustable, High-Efficiency,
Low I
6
(Circuit of Figure 2a, T
______________________________________________________________Pin Description
____________________________Typical Operating Characteristics (continued)
_______________________________________________________________________________________
PIN
1
2
3
4
5
6
7
8
Q
, Step-Up DC-DC Controller
NAME
SHDN
AGND
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 5 A
maximum. Connect to ground for normal operation.
1.5V Reference Output that can source 100 A for external loads. Bypass to GND with 0.1 F.
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
OUT
= 500mA, V
, 5V/div
ENTERING/EXITING SHUTDOWN
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IN
= 5V
2ms/div
FUNCTION
0V
5V
0V
OUT
is a diode drop