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Part Name :

MAX774CPA View Datasheet(PDF) - Maxim Integrated

Part NameMAX774CPA MaximIC
Maxim Integrated MaximIC
Description-15V or adjustable, high-efficiency, low IQ inverting DC-DC controller
MAX774CPA Datasheet PDF : 16 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low IQ Inverting DC-DC Controllers
____________________________Typical Operating Characteristics (continued)
(TA = +25°C, unless otherwise noted.)
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
A
B
100µs/div
CIRCUIT OF FIGURE 2
V+ = 6V, VOUT = -5V
A: ILOAD, 30mA TO 1A, 1A/div
B: VOUT, 100mV/div, AC-COUPLED
A
B
2ms/div
CIRCUIT OF FIGURE 2
VOUT = -5V, ILOAD = 1A
A: V+, 3V TO 8V, 5V/div
B: VOUT, 100mV/div, AC-COUPLED
______________________________________________________________Pin Description
PIN
NAME
FUNCTION
1
OUT
The sense input for fixed-output operation (VFB = VREF). OUT is connected to the internal voltage divider,
and it is the negative supply input for the EXT driver.
2
FB
Feedback input. When VFB = VREF, the output will be the factory preset value. For adjustable operation,
use an external voltage divider, as described in the Adjustable Output section.
3
SHDN
Active-high shutdown input. With SHDN high, the part is in shutdown mode and the supply current is less
than 5µA. Connect to GND for normal operation.
4
REF
1.5V reference output that can source 100µA. Bypass to ground with 0.1µF.
5
V+
Positive power-supply input
6
CS
Noninverting input to the current-sense comparator. Typical trip level is 210mV (relative to V+).
7
EXT
The gate-drive output for an external P-channel power MOSFET. EXT swings from OUT to V+.
8
GND Ground
8 _______________________________________________________________________________________
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The MAX774/MAX775/MAX776 inverting switching regulators deliver high efficiency over three decades of load current.

A unique current-limited, pulse frequency modulated (PFM) control scheme provides the benefits of pulse-width modulation (high efficiency with heavy loads), while using less than 100µA of supply current (vs. 2mA to 10mA for PWM converters).

The result is high efficiency over a wide range of loads.

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