TS51221 Datasheet, PDF (6/18 Pages) Semtech Corporation – High Efficiency Regulator IC for Wireless Power Receiver Applications

Regulator Characteristics
Electrical Characteristics, T_J = -40C to 125C, VCC = 12V (unless otherwise noted)
Symbol
Parameter
Condition
Switch Mode Regulator: L=4.7uH and C=2 x 22uF
V_OUT-PWM
Output Voltage Tolerance in PWM
Mode
I_LOAD =1A
V_OUT-PFM
Output Voltage Tolerance in PFM
Mode
I_LOAD = 0A
R_DSON
I_OUT
I_OCD
FB_TH
High Side Switch On Resistance
Low Side Switch On Resistance
Output Current
Over Current Detect
Feedback Reference (Adjustable
Mode)
I_VSW = -1A (Note 1)
I_VSW = 1A (Note 1)
HS switch current
(Note 3)
FB_TH-TOL
T_SS
Feedback Reference Tolerance
Soft start Ramp Time
(Note 3)
FB_TH-PFM
PFM Mode FB Comparator Threshold
V_OUT-UV
V_OUT Under Voltage Threshold
V_{OUT-UV_HYST}
V_OUT Under Voltage Hysteresis
V_OUT-OV
V_OUT Over Voltage Threshold
V_{OUT-OV_HYST}
V_OUT Over Voltage Hysteresis
DUTY_MAX
Max Duty Cycle
(Note 2)
Note 1: R_DSON is characterized at 1A and tested at lower current in production.
Note 2: Regulator VSW pin is forced off for 240ns every 8 cycles to ensure the BST cap is replenished.
Note 3: For the adjustable version, the ratio of VCC/V_OUT cannot exceed 16.
Note 4: Based on Over Current Detect testing
Min Typ Max Unit
V_OUT – V_OUT
2%
V_OUT + _V
2%
V_OUT – V_OUT + V_OUT + _V
1% 1% 3.5%
180
mΩ
120
mΩ
1
A
1.4 1.8 2.4 A
0.886 0.9 0.914 V
-1.5
1.5 %
4
ms
V_OUT +
V
1%
91%
V_OUT
93%
V_OUT
1.5%
V_OUT
103%
V_OUT
1%
V_OUT
95%
V_OUT
95% 97% 99%
TS51221
Final Datasheet
April 6, 2015
Rev 1.1
www.semtech.com
6 of 18
Semtech