MAX608 Maxim, MAX608 Datasheet - Page 6

• Manufacturer Part Number: MAX608
• Description: 5V or Adjustable / Low-Voltage / Step-Up DC-DC Controller
• Manufacturer: Maxim

5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
Figure 1. Functional Diagram
6
______________________________________________________________Pin Description
_______________________________________________________________________________________
PIN
1
2
3
4
5
6
7
8
MAX ON-TIME
ONE-SHOT
TRIG
16 s
NAME
AGND
SHDN
GND
OUT
EXT
REF
CS
FB
Q
S
MIN OFF-TIME
REFERENCE
ONE-SHOT
Q
1.5V
2.3 s
F/F
R
TRIG
Gate Drive for External N-Channel Power Transistor
Power-Supply and Voltage-Sense Input. Always connect OUT to circuit output.
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 the input voltage (due to the DC path from the input voltage to the output). 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 AGND.
Q
REF
LOW-VOLTAGE
OSCILLATOR
COMPARATOR
ERROR
CURRENT-SENSE
AMPLIFIER
FB
50mV
FUNCTION
DUAL-MODE
COMPARATOR
0.1V
N
MAX608
2.5V
LOW-VOLTAGE
COMPARATOR
START-UP
CIRCUITRY
OUT
BIAS
is a diode drop
SHDN
OUT
EXT
CS