WM8321
Production Data
7
ELECTRICAL CHARACTERISTICS
7.1 DC-DC SYNCHRONOUS BUCK CONVERTERS
DC-DC1 and DC-DC2
Unless otherwise noted: VIN = 3.8V, VOUT = 1.2V, MODE = FCCM(1), TJ = -40°C to +125°C; typical values are at TJ = 25°C
PARAMETER
SYMBOL
VIN
TEST CONDITIONS
MIN
2.7
0.6
0.6
TYP
MAX
5.5
UNIT
V
Input Voltage
Programmable
Output Voltage
F
SW = 2MHz
VOUT
1.8
V
FSW = 4MHz
1.4
VOUT Step Size
VOUT Accuracy
VOUT_STEP
VOUT_ACC
VUV
12.5
mV
%
V
IN = 2.7V to 5.5V, IOUT = 0mA to 1250mA
-2.5
+2.5
Undervoltage
margin
0.6V ≤ VOUT < 0.9V
0.9V ≤ VOUT < 1.3V
1.3V ≤ VOUT ≤ 1.8V
0.6V ≤ VOUT ≤ 1.8V
50
80
mV
100
Overvoltage
margin
VOV
IOUT
100
mV
mA
Output Current
FCCM(1) and Auto (CCM/DCM with PS(2)
Modes
)
0
1250
Hysteretic Mode
LDO Mode
0
0
150
10
P-channel
DCm_FREQ = 01 or 10
IP_LIM
1850
2050
mA
Current Limit
DCm_FREQ = 11
Quiescent
Current
I
OUT = 0mA, FCCM(1) and Auto (CCM/DCM with
IQ
A
585
PS(2)) Modes (excluding switching losses)
IOUT = 0mA, Hysteretic Mode
IOUT = 0mA, LDO Mode
100
25
Shutdown
Current
ISD
A
DCm_ENA = 0
0.01
150
140
P-channel
RDSP
m
VIN = VGS = 3.8V, IDCmLX = 100mA
VIN = VGS = 3.8V, IDCmLX = -100mA
On Resistance
N-channel
RDSN
FSW
m
On Resistance
Switching
Frequency
DCm_FREQ = 01
DCm_FREQ = 1X
2
4
MHz
Notes:
1. Forced Continuous Conduction Mode
2. Continuous / Discontinuous Conduction with Pulse-Skipping Mode
PD, February 2012, Rev 4.0
16
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
