Datasheet

TPS51219
SLUSAG1B –MARCH 2011– REVISED OCTOBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS
over operating free-air temperature range, V
V5
= 5 V, V
MODE
= 0 V, V
EN
= 5 V (unless otherwise noted)
PARAMETER TEST CONDITION MIN TYP MAX UNIT
SUPPLY CURRENT
I
V5
V5 supply current T
A
= 25°C, No load, V
EN
= 5 V 560 μA
I
V5SDN
V5 shutdown current T
A
= 25°C, No load, V
EN
= 0 V 0.5 2.0 μA
VREF OUTPUT
V
VREF
Output voltage I
VREF
= 0 μA wrt GSNS 2.000 V
0 μA ≤ I
VREF
< 30 μA, T
A
= 0°C to 85°C -0.8% 0.8%
V
VREF(tol)
Output voltage tolerance
0 μA ≤ I
VREF
< 300 μA, T
A
= –40°C to 85°C -1.2% 1.2%
I
VREF(ocl)
Current limit V
VREF-GSNS
= 1.7 V 0.4 1.0 mA
OUTPUT VOLTAGE
V
REFIN
= 0 V 1.000 V
V
VSNS
VSNS sense voltage V
REFIN
= 3.3 V 1.050 V
0.5 V ≤ V
REFIN
≤ 2 V V
REFIN
V
V
REFIN
= 0 V, 0°C ≤ T
A
≤ 85°C –9 9
V
REFIN
= 0 V, -40°C ≤ T
A
≤ 85°C -14 14
V
VSNS(tol)
VSNS regulation voltage tolerance V
REFIN
= 3.3 V, 0°C ≤ T
A
≤ 85°C –9 9 mV
V
REFIN
= 3.3 V, -40°C ≤ T
A
≤ 85°C -14 14
V
REFIN
= 0.5 V and V
REFIN
= 2.0 V -5 5
V
REFIN1
REFIN voltage for 1.00-V output 0.3 V
V
REFIN1P05
REFIN voltage for 1.05-V output 2.2 V
V
OFF_LPCMP
Loop comparator offset voltage V
REFIN
= 1 V, VSNS shorted to COMP -5 5 mV
V
REFIN
= 0 V, V
VSNS
= 0.95 V 0.885 V
V
COMPCLP
COMP clamp voltage
V
REFIN
= 0 V, V
VSNS
= 1.05 V 1.115 V
g
M
Error amplifier transconductance V
REFIN
= 0 V 130 μS
I
VSNS
VSNS input current V
VSNS
= 1.05 V -1 1 μA
I
REFIN
REFIN input current V
REFIN
= 0 V –1 1 μA
I
VSNS(dis)
VSNS discharge current V
EN
= 0 V, V
VSNS
= 0.5 V 5 12 mA
SWITCH MODE POWER SUPPLY (SMPS) FREQUENCY
V
IN
= 12 V, V
VSNS
= 1.8 V, V
MODE
= 2.5 V 400
V
IN
= 12 V, V
VSNS
= 1.8 V, V
MODE
= 1.67 V 300
f
SW
Switching frequency kHz
V
IN
= 12 V, V
VSNS
= 1.8 V, V
MODE
= 0.2 V 670
V
IN
= 12 V, V
VSNS
= 1.8 V, V
MODE
= 0.033 V 500
t
ON(min)
Minimum on time DH rising to falling
(1)
60
ns
t
OFF(min)
Minimum off time DH falling to rising 320
MOSFET DRIVERS
Source, I
DH
= –50 mA 1.6 3.0
R
DH
DH resistance
Sink, I
DH
= 50 mA 0.6 1.5
Ω
Source, I
DL
= –50 mA 0.9 2.0
R
DL
DL resistance
Sink, I
DL
= 50 mA 0.5 1.2
DH-off to DL-on 10
t
DEAD
Dead time ns
DL-off to DH-on 20
INTERNAL BOOT STRAP SWITCH
V
FBST
Forward voltage V
V5-BST
, T
A
= 25°C, I
F
= 10 mA 0.1 0.2 V
I
BSTLK
BST leakage current T
A
= 25°C, V
BST
= 33 V, V
SW
= 28 V 0.01 1.5 μA
(1) Ensured by design. Not production tested.
4 Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated