MAX1536 Datasheet, PDF (10/19 Pages) Maxim Integrated Products – 3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-Down Regulator with Dynamic Output Voltage Control

3.6A, 1.4MHz, Low-Voltage, Internal-Switch Step-
Down Regulator with Dynamic Output Voltage Control
V_IN
+3.0V TO +5.5V
10Ω
2.2μF
POWER GOOD
IN
C_IN
2 X 10μF
+6.3V X5R
100kΩ
C_COMP
470pF
V_CC
COMP
PGOOD
L1
1.2μH, SUMIDA
CDR7D28MN-1R2
LX
R_A
FB
PGND
R_B
AGND
V_OUT
C_OUT
+0.7V TO V_IN
100μF, +6.3V
POSCAP
PWM MODE
ON
SKIP
IDLE MODE
MAX1536
SHDN
OFF
FBLANK
REF
REFIN
OD
OD
TOFF
GATE
R_TOFF
75kΩ
C_REF
R1
0.22μF
C_REFIN
470pF
R2
R3
V_FB(HIGH)
( ) ^{VOUT = VFB}
1
+
R_A
R_B
V_FB(LOW)
( ) ^{VFB(LOW) = VREF}
R2
R1 + R2
( ) ^{R2 + R3}
V_FB(HIGH) = V_{REF R1 + R2 + R3}
Figure 1. MAX1536 Standard Application Circuit
Table 1. Recommended Component Values (I_OUT = 3.6A)
FULL-LOAD SWITCHING
V_IN (V) V_OUT (V)
FREQUENCY
f_PWM (kHz)
L (µH)
R_TOFF (kΩ)
R1 (kΩ)
R2 (kΩ)
R3 (kΩ)
R_A (kΩ)
R_B (kΩ)
5
3.3*
1020
1.2
30.1
Short
Open
Open
6.49
10
5
2.5*
1020
1.2
47.5
Short
Open
Open
2.49
10
5 1.8/1.5**
820/900
1.2
78.7
20
60.4
121
Short
Open
5
0.7*
450
1.2
200
130
69.8
Short
Short
Open
3.3
2.5*
640
1.0
30.1
Short
Open
Open
2.49
10
3.3 1.8/1.5**
840/1030
1.0
49.9
20
60.4
121
Short
Open
3.3
0.7*
660
1.0
121
130
69.8
Short
Short
Open
*In single-output voltage applications, OD, OD, and GATE are general-purpose gates. If OD and OD are not used, connect GATE to
AGND and leave OD and OD open.
**The output voltage changes between two set points depending on VGATE. See the Setting Dynamic Output Voltages with REFIN section.
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