100mA(10mA) - A range
High-Side Current-Sense Amplifiers, MAX471/472
Bidirectional, Bandwidth: not defined, assumed 100kHz order for small signal, 10kHz order for bidirectional.
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1108

High-Side Current-Sense Amplifiers with Internal Gain, MAX4376-8
Single direction, Bandwidth 1-2MHz
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/2304

MAX472 and MAX4376-8 need external resistor to measure the current.
For precise measurement, next link shows precision four terminal resistors for current measurement.
PCN Shunt Chip Resistors
http://www.pcn.co.jp/pcn-English/Images/seihin-01.html

Tsuneo