WM8321 Datasheet, PDF (17/253 Pages) Wolfson Microelectronics plc – Processor Power Management Subsystem

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
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Input Voltage
Programmable
Output Voltage
V_IN
V_OUT
2.7
0.85⁽⁴⁾
5.5
V
3.4
V
VOUT Step Size
VOUT_STEP
25
mV
VOUT Accuracy
Undervoltage
margin
VOUT_ACC
VUV
VIN = 2.7V to 5.5V, IOUT = 0mA to 1000mA
0.85V ≤ V_OUT ≤ 3.4V
-4
+4
%
50
mV
Output Current
IOUT
FCCM⁽¹⁾ and Auto
Independent operation
(CCM/DCM with
(DC4_SLV=0)
0
PS⁽²⁾) Modes
Dual mode operation
(DC4_SLV=1)
0
1000
mA
800⁽⁵⁾
Hysteretic Mode, DCm_STNBY_LIM=01
0
100⁽³⁾
LDO Mode
0
10
P-channel
Current Limit
IP_LIM
1600
mA
Quiescent
Current
IQ
IOUT = 0mA, FCCM⁽¹⁾ and Auto (CCM/DCM with
PS⁽²⁾) Modes (excluding switching losses)
330
A
I_OUT = 0mA, Hysteretic Mode
110
Shutdown
Current
I_OUT = 0mA, LDO Mode
I_SD
DCm_ENA = 0
20
0.01
A
P-channel
On Resistance
RDSP
VIN = VGS = 3.8V, IDCmLX = 100mA
165
m
N-channel
On Resistance
RDSN
VIN = VGS = 3.8V, IDCmLX = -100mA
155
m
Switching
F_SW
Frequency
2
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 V_OUT 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: V_IN = 3.8V, V_OUT = 1.8V, T_J = -40°C to +125°C; Typical values are at T_J = +25ºC
PARAMETER SYMBOL
TEST CONDITIONS
MIN
TYP
Input Voltage
VIN
1.5
Programmable
Output Voltage
VOUT
0.9
VOUT Step Size
Output Current
V_{OUT_STEP}
IOUT
VOUT = 0.9V to 1.6V
VOUT = 1.7V to 3.3V
Normal mode
Low power mode, LDOn_LP_MODE=0
50
100
0
0
Low power mode, LDOn_LP_MODE=1
0
V_OUT Accuracy
VOUT_ACC
I_LOAD = 1mA
-3
MAX
5.5
3.3
300
50
20
+3
UNIT
V
V
mV
mA
%
w
PD, February 2012, Rev 4.0
17