Manual

MAX8649
1.8A Step-Down Regulator with Differential
Remote Sense in 2mm x 2mm WLP
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
= V
IN2
= 3.6V, V
AGND
= V
PGND
= 0V, V
DD
= 1.8V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
=
+25°C.) (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
No load, V
IN_
= 2.5V to 5.5V, V
OUT
= 1.27V
OPERATION_MODE_ = 1
-0.5 +0.5
I
OUT
= no load, V
IN_
= 2.5V to 5.5V, V
OUT
= 0.75V,
OPERATION_MODE_ = 1
-1.0 +1.0
OUT Voltage Accuracy
I
OUT
= no load, V
IN_
= 2.5V to 5.5V, V
OUT
= 1.38V,
OPERATION_MODE_ = 1
-0.5 +0.5
%
Load Regulation R
L
is the resistance from LX to SNS+ (output) R
L
/25 V/A
RAMP[2:0] = 000 32.50
RAMP[2:0] = 001 16.25
RAMP[2:0] = 010 8.125
RAMP[2:0] = 011 4.063
RAMP[2:0] = 100 2.031
RAMP[2:0] = 101 1.016
RAMP[2:0] = 110 0.508
RAMP Timer
RAMP[2:0] = 111 0.254
mV/µs
Peak Current Limit
(p-Channel MOSFET)
PWM and hysteretic mode 2.3 2.8 3.2 A
Valley Current Limit
(n-Channel MOSFET)
Hysteretic mode 1.8 2.4 3.0 A
Negative Current Limit
(n-Channel MOSFET)
PWM mode 2.0 2.5 3.0 A
n-Channel Zero-Crossing
Threshold
50 0.16 mA
LX pFET On-Resistance IN2 to LX, I
LX
= -200mA 0.08 0.16 Ω
LX nFET On-Resistance
OPERATION_MODE = 0
LX to PGND, I
LX
= 200mA
0.06 0.12 Ω
T
A
= +25°C -1 0.03 +1
LX Leakage V
LX
= 5.5V or 0V
T
A
= +85°C 0.05
µA
Internal oscillator, PWM 2.82 3.25 3.56
Internal oscillator, power-save mode before entering
PWM mode
2.43 3.25 4.06
13MHz option f
SYNC
/4
19.2MHz option f
SYNC
/6
Operating Frequency
26MHz option f
SYNC
/8
MHz