Datasheet

TPS62750, TPS62751
www.ti.com ................................................................................................................................................. SLVS955A –JULY 2009–REVISED SEPTEMBER 2009
ELECTRICAL CHARACTERISTICS
Over full operating ambient temperature range, typical values are at T
A
= 25°C. Unless otherwise noted, specifications apply
for condition V
IN
= EN = 5.0V. External components C
IN
= 10μF 0603, C
O
= 10μF 0603, C
BULK
= 1.5mF, L = 2.2μH, refer to
parameter measurement information.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY
V
IN
Input Voltage Range 2.9 6.0 V
I
Q
Operating Quiescent Current I
OUT
= 0 mA, device not switching 745 960 μA
(TPS62750)
(1)
I
OUT
= 0 mA, device not switching 30 mA
(TPS62751)
(1)
I
SD
Shutdown Current EN = GND 0.2 3.0 μA
Falling 2.4 V
V
UVLO
Undervoltage Lockout Threshold
Rising 2.9 V
ENABLE, H/L
V
IH
High Level Input Voltage 2.9 V ≤ V
IN
≤ 6.0V 1.0 V
V
IL
Low Level Input Voltage 2.9 V ≤ V
IN
≤ 6.0 V 0.4 V
I
IN
Input bias Current Pin tied to GND or VIN 0.01 1.0 μA
POWER SWITCH
High side MOSFET On-Resistance V
IN
= 5.0 V, V
GS
= 6.5 V 130 290 mΩ
(H/L=HI)
R
DS(ON)
High side MOSFET On-Resistance V
IN
= 5.0 V, V
GS
= 6.5 V 282 550 mΩ
(H/L=LO)
Low Side MOSFET On-Resistance V
IN
= V
GS
= 5.0 V 58 125 mΩ
I
LIMF
Forward Current Limit High-Side and Low V
IN
= V
GS
= 5.0 V 1200 1500 1800 mA
side
I
LIM_U
selected, H/L = High 300 1300
mA
I
IN(MAX)
Programmable Input current Range I
LIM_L
selected, H/L = Low 50 300
I
LIM_U
selected, Current limit accuracy –10 10 %
Thermal shutdown Increasing junction temperature 150 °C
T
SD
Thermal shudown hysteresis Decreasing junction temperature 20 °C
OSCILLATOR
f
SW
Oscillator Frequency 2.9 V ≤ V
IN
≤ 6.0 V 2.0 2.25 2.5 MHz
OUTPUT
V
OUT
Adjustable Output Voltage Range 0.8 0.85 × V
V
IN
V
ref
Reference Voltage 600 mV
V
FB(PWM)
Feedback Voltage PWM operation, 2.9 V ≤ V
IN
≤ 6.0V
(2)
–1.5% 1.5%
R
(DIS_CH)
Internal discharge resistor Activated with EN = GND 85 235 300 Ω
(1) In PFM mode, the internal reference voltage is set to typ. 1.01 × V
ref
. See the parameter measurement information.
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