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MAX608EPA

P1-P3P4-P6P7-P9P10-P12
MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
4
_______________________________________________________________________________________
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
0
100
150
200
250
50
2
4
68
10
12
EXT RISE/FALL TIME vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
EXT RISE/FALL TIME (ns)
C
EXT
= 2200pF
C
EXT
= 1000pF
C
EXT
= 470pF
C
EXT
= 100pF
MAX608-07
250
0
-60 -20 60 140
REFERENCE OUTPUT RESISTANCE vs.
TEMPERATURE
50
MAX608-08
TEMPERATURE (°C)
REFERENCE OUTPUT RESISTANCE (Ω)
20 100
150
-40 0 8040 120
100
200
100µA
50µA
10µA
1.502
-60 -20 60 140
REFERENCE vs. TEMPERATURE
MAX608-09
TEMPERATURE (°C)
REFERENCE (V)
20 100-40 0 8040 120
1.500
1.498
1.496
1.494
1.492
1.504
1.506
V
IN
= 3V, I
OUT
= 490mA, V
OUT
= 5V
A = EXT VOLTAGE, 5V/div
B = INDUCTOR CURRENT, 1A/div
C = V
OUT
RIPPLE, 50mV/div, AC-COUPLED
MEDIUM-LOAD SWITCHING WAVEFORMS
(V
OUT
= 5V)
A
B
C
V
OUT
0V
I
LIM
0A
20µs/div
4.0
-60 -20 60 140
SHUTDOWN CURRENT vs. TEMPERATURE
MAX608-11
TEMPERATURE (°C)
SHUTDOWN CURRENT (µA)
20 100-40 0 8040 120
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V+ = 15V
V+ = 4V
V+ = 8V
2.20
2.25
2.30
-60
-30 0 30 60
90
120 150
MINIMUM SWITCH OFF-TIME vs.
TEMPERATURE
TEMPERATURE (°C)
t
OFF(min) (µs)
MAX608-12
15.5
16.0
16.5
-60
-30 0 30 60
90
120 150
MAXIMUM SWITCH ON-TIME vs.
TEMPERATURE
TEMPERATURE (°C)
t
ON(max) (µs)
MAX608-10
V
IN
= 3V, I
OUT
= 930mA, V
OUT
= 5V
A = EXT VOLTAGE, 5V/div
B = INDUCTOR CURRENT, 1A/div
C = V
OUT
RIPPLE, 50mV/div, AC-COUPLED
HEAVY-LOAD SWITCHING WAVEFORMS
(V
OUT
= 5V)
A
B
C
V
OUT
0V
I
LIM
0A
2µs/div
MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
_______________________________________________________________________________________
5
____________________________Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
V
IN
= 4V, I
OUT
= 490mA, V
OUT
= 12V
A = EXT VOLTAGE, 10V/div
B = INDUCTOR CURRENT, 1A/div
C = V
OUT
RIPPLE, 50mV/div, AC-COUPLED
HEAVY-LOAD SWITCHING WAVEFORMS
(V
OUT
= 12V)
A
B
C
V
OUT
0V
I
LIM
0A
2µs/div
V
IN
= 4V, I
OUT
= 300mA, V
OUT
= 12V
A = EXT VOLTAGE, 10V/div
B = INDUCTOR CURRENT, 1A/div
C = V
OUT
RIPPLE, 50mV/div, AC-COUPLED
MEDIUM-LOAD SWITCHING WAVEFORMS
(V
OUT
= 12V)
A
B
C
V
OUT
0V
I
LIM
0A
10µs/div
V
IN
= 2V, V
OUT
= 5V
A = LOAD CURRENT, 0mA TO 500mA, 500mA/div
B = V
OUT
RIPPLE, 50mV/div, AC-COUPLED
LOAD-TRANSIENT RESPONSE
(V
OUT
= 5V)
A
B
500mA
0A
2ms/div
I
OUT
= 500mA, V
OUT
= 5V
A = V
IN
, 2.7V TO 4.0V, 1V/div
B = V
OUT
RIPPLE, 100mV/div, AC-COUPLED
LINE-TRANSIENT RESPONSE
(V
OUT
= 5V)
A
B
4.0V
2.7V
5ms/div
I
OUT
= 500mA, V
IN
= 3.5V
A = SHDN, 2V/div
B = V
OUT
, 2V/div
EXITING SHUTDOWN
A
B
0V
0V
5V
200µs/div
MAX608
5V or Adjustable, Low-Voltage,
Step-Up DC-DC Controller
6
_______________________________________________________________________________________
______________________________________________________________Pin Description
PIN NAME FUNCTION
1 EXT Gate Drive for External N-Channel Power Transistor
2 OUT
3 FB
4 SHDN
5 REF
6 AGND Analog Ground
7 GND High-Current Ground Return for the Output Driver
8 CS
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
OUT
is a diode drop
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 100µA for external loads. Bypass to GND with 0.1µF.
The reference is disabled in shutdown.
Positive Input to the Current-Sense Amplifier. Connect the current-sense resistor between CS
and AGND.
1.5V
REFERENCE
Q TRIG
QS
F/F
R
QTRIG
LOW-VOLTAGE
OSCILLATOR
2.5V
0.1V
MAX ON-TIME
ONE-SHOT
MIN OFF-TIME
ONE-SHOT
CURRENT-SENSE
AMPLIFIER
DUAL-MODE
COMPARATOR
FB
REF
50mV
ERROR
COMPARATOR
SHDN
OUT
LOW-VOLTAGE
START-UP
COMPARATOR
EXT
CS
BIAS
CIRCUITRY
N
MAX608
2.3µs
16µs
Figure 1. Functional Diagram
P1-P3P4-P6P7-P9P10-P12

MAX608EPA

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Description:
IC REG CTRLR BOOST 8DIP
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