Production Data
WM8321
DC-DC3 and DC-DC4
Unless otherwise noted: VIN = 3.8V, VOUT = 1.8V, MODE = FCCM(1), TJ = -40°C to +125°C; typical values are at TJ = 25°C
PARAMETER
SYMBOL
VIN
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage
2.7
5.5
V
Programmable
Output Voltage
VOUT
0.85(4)
-4
3.4
+4
V
VOUT Step Size
VOUT Accuracy
VOUT_STEP
VOUT_ACC
VUV
25
50
mV
%
V
IN = 2.7V to 5.5V, IOUT = 0mA to 1000mA
Undervoltage
margin
0.85V ≤ VOUT ≤ 3.4V
mV
mA
Output Current
FCCM(1) and Auto
(CCM/DCM with
PS(2)) Modes
Independent operation
(DC4_SLV=0)
IOUT
0
0
1000
800(5)
Dual mode operation
(DC4_SLV=1)
100(3)
10
Hysteretic Mode, DCm_STNBY_LIM=01
0
0
LDO Mode
P-channel
IP_LIM
IQ
1600
330
mA
Current Limit
Quiescent
Current
I
OUT = 0mA, FCCM(1) and Auto (CCM/DCM with
A
PS(2)) Modes (excluding switching losses)
IOUT = 0mA, Hysteretic Mode
IOUT = 0mA, LDO Mode
110
20
Shutdown
Current
DCm_ENA = 0
ISD
A
0.01
165
155
2
P-channel
V
IN = VGS = 3.8V, IDCmLX = 100mA
IN = VGS = 3.8V, IDCmLX = -100mA
RDSP
m
On Resistance
N-channel
V
RDSN
FSW
m
On Resistance
Switching
Frequency
MHz
Notes:
1. Forced Continuous Conduction Mode
2. Continuous / Discontinuous Conduction with Pulse-Skipping Mode
3. The maximum output current in Hysteretic mode can be adjusted using the DCm_STNBY_LIM registers
4. In FCCM mode, the minimum VOUT is 1.2V
5. In Dual mode operation, the ratings are ‘per converter’. The combined maximum output current is 1600mA
7.2 LDO REGULATORS
LDO1
Unless otherwise noted: VIN = 3.8V, VOUT = 1.8V, TJ = -40°C to +125°C; Typical values are at TJ = +25ºC
PARAMETER
SYMBOL
VIN
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage
1.5
5.5
V
Programmable
Output Voltage
VOUT
0.9
3.3
V
VOUT Step Size
VOUT_STEP
VOUT = 0.9V to 1.6V
50
mV
VOUT = 1.7V to 3.3V
100
Output Current
Normal mode
IOUT
0
0
300
50
mA
%
Low power mode, LDOn_LP_MODE=0
Low power mode, LDOn_LP_MODE=1
0
20
VOUT Accuracy
ILOAD = 1mA
VOUT_ACC
-3
+3
PD, February 2012, Rev 4.0
17
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
